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 程式師世界 >> 編程語言 >> JAVA編程 >> JAVA編程入門知識 >> 在JavaScript程序中整合Java函數

在JavaScript程序中整合Java函數

編輯:JAVA編程入門知識

  
  問題的提出:   假定我們的Html 頁中有一些表單需要處理,並且我們需要初始化數據庫中的字段,我們該怎麼辦?標准的解決辦法就是使用CGI腳本或是使用Java Servlet等服務器端程序,但是你有沒有想過,還可以編寫一個腳本程序使你可以用javascript直接調用服務器端Java程序進行任何計算的結果,就像下面代碼中列的那樣:

  <html>
  我們的表單<br>
  <form>
  <input type="text" name="textField"><br>
  <input type="button" value="Click" onClick="updateField();">
  </form>
  <script>
  function updateField()
  {
  document.forms[0].textField.value=java.dbConnection.getData('SQL_eXPr');
  }
  </script>
  </html>

  所以,當用戶點擊按鈕,該程序就會調用Java的dbConnection類,然後就可以在JavaScript應用程序中使用Java返回的結果了。上面的程序只是更新了textField的值,我們不必刷新整個頁面。由於這個程序也不是jsp文件,所以不必把你的頁面編譯成Java Servlet。

  你還可以使用調用某些Java函數返回的結果替代段落中的文字;在一個非常大的HTML表中,你可以使用同樣的方法,只要更新一行信息:

  
  <script language="JavaScript">
  function changeCol()
  {
  document.all.quote.rows[0].cells[1].innerText=java.Stock.getQuote('Wayne');
  }
  </script>

  <table id="quote" border=1>
  <tr><td>Wayne</td><td>123</td></tr>
  <tr><td>Another one</td><td>34</td></tr>
  </table>

  
  怎麼樣,能夠直接在JavaScript中嵌入Java對象的調用,而且可以保證你的頁面的其它部分不會被改變,你一定對這個問題比較感愛好吧。好吧,現在就讓我們用Java Servlet來實現它吧。

  工作原理

  我的構思是使用Java Servlet編寫一個JinJ(Java in JavaScript)程序,能夠讓 HTML 頁面內整合 Java 類和 JavaScript腳本,將所有使用JavaScript調用Java函數的HTML頁面都傳送到這個Servlet中處理,JinJ將即時產生帶有Java applet的隱藏幀,

  這個applet起著橋梁的作用,用來和Java通訊,它的大小還不到2KB,為了調用對象,Applet使用HTTP連接同一個JinJ Servlet。JinJ用相應的JavaScript結構來替換所有的Java調用(其實每一個調用前都有前綴java),並且保持頁面的其它部分不變。所以,為了能夠讓JinJ正確識別,你的JavaScript代碼中的任何Java調用,都要使用如下的結構: java.object_name.function_name(list_of_parameters) 其中:

  java:是一個標准的前綴:

  object_name:是一個變量名,保存某些Java類的實例(在後面,我們會具體的探討如何創建/定義這樣的變量),比如說它可以是一個類名。

   function_name:是一個Java類的函數名。

   list_of_parameters:是調用的函數的參數列表(可以為空)。

  下面也將會探討如何把參數傳給Java,每個參數顯然是某個JavaScript表達式。你也可以使用預編譯頁,換句話說就是在使用HTML頁面之前編譯它。

  服務器實現

  在談編程之前我還想說一說JinJ的服務器實現。在你的服務器中需要兩個組成部分:JINJ servlet和bridge applet.。你所有需要被整合的HTML頁面都是被JinJ servlet預處理,你可以通過以下方法實現:

  a)把你的頁面當作一個參數傳遞給JinJ servlet

  所以你可以把你HTML頁中如下的超鏈接<a href="mypage.html">我的頁面</a>改為:<a href="http://myhost/servlet/JinJ?mypage.html" target="_top">我的頁面</a>

  JinJ servlet 隨即把所有的Java調用轉化成JavaScript,然後產生頁面並輸出出來。

  b)定義某種映射。舉例來說,這裡我們設置Servlet調用擴展名為.JinJ的文件 (這裡介紹的方法針對運行於NT上的JSWDK,你所使用的Servelt系統的具體定義映射的方法請參看你的用戶指南)

  JinJ.code=JinJ

  JinJ.initparams=servlet=http://myhost/servlet/JinJ,
  root=c:jswdkwebpages,
  objects=c:jswdkobj.txt,
  codebase=http://myhost/
  設置了以後,你就可以使用http://myhost/some_file.JinJ然後JinJ servlet將會自動被調用了

  Servlet參數

  為了讓JinJ正常運行,還應當能夠為JinJ servlet設置一些全局參數,這也是我們在編程是應當注重到的問題。對於JSWDK, Servlet屬性是參數'initparams'的一部分;對於Tomcat,則應當編輯系統中的web.XML

  
  1)需要設置JinJ servlet的路徑,參數名是servlet,就像這樣:

  http://your_host:port/servlet/JINJ

  2) 需要設置存放HTML頁的根目錄,參數名是root,其值就像這樣: /home/webpages (或c:webpages) (默認值是一個空的字符串)。 例如,假如你的根目錄是:/home/webpages,並且你使用http://host/servlet/JINJ?myfile.htm 的話,那你的真實的文件名是/home/webpages/myfile.htm

  3) 需要設置你定義的Java對象的文件的完全目錄,參數名是objects,其值只是一個存放在你的服務器中的一個文件的文件名。

  4) 需要設置用於java applet的codebase,參數名是codebase,定義了存放applet的類的路徑,比如http://your_host/ 。

  以下為Tomcat中web.xml 中的相應設置:

   

  <servlet>
  <servlet-name>JinJ</servlet-name>
  <servlet-class>JinJ</servlet-class>
  <init-param>
  <param-name>servlet</param-name>
  <param-value>http://your_host/servlet/JinJ</param-value>
  </init-param>
  <init-param>
  <param-name>root</param-name>
  <param-value>path_to_the_root_Directory</param-value>
  </init-param>
  <init-param>
  <param-name>objects</param-name>
  <param-value>path_to_your_objects_file</param-value>
  </init-param>
  <init-param>
  <param-name>codebaset</param-name>
  <param-value>http://your_host/</param-value>
  </init-param>
  </servlet>

  
  在編程時還應當注重實現讀取對象文件中所包含的對象,或創建新的Java對象

  1. 在初始化JinJ Servlet時將創建一些Java對象,因此你必須在某個文本文件中定義這些對象,並且在參數objects中設置這個文件的路徑,這是一個文本文件,每一行描述了一個元素(空行和以#或//開頭的行將被忽略),使用下面的格式來描述參數:

   object_name=new class_name(list_of_parameters);

  換句話說,它很象每次調用類構造器的new操作符,object_name 是就是某個你將在JavaScript中使用到的標識符,例如:

  file://數據池

  A=new dbPool(5);

  file://哈希表

  B=new java.util.Hashtable();

  或者使用你自己定義的包和類:c=new myPackage.myClass(true);

  然後在JavaScript中,你就可以使用它們了,如A.connect(),其中connect() 是類dbPool的一個函數,或者使用B.put('key',value)

  注重:

  1)你的類應當放在你的CLASSPATH指定的目錄下面。

  2)你可以使用類名作為對象名 (不過這必須在沒有重名的情況下,因為對象名必須是唯一的),如:dbPool=new dbPool();

  2. 為了更優化程序,應當在編程的時候就預建一些對象組成標准化庫,通過標准化庫,你可以在運行中創建/刪除對象的實例,查看存在的對象等。

  下面就是我們需要實現的標准化庫(預定義的對象) ,對象名是JinJ,所以服務器端名為JinJ的實例將會被自動創建,這給類中有下面幾個函數:

   

  public boolean create(String object_name,String class_name,list_of_constrUCtors_parameters);
  public void delete(String object_name);
  public boolean exists(String object_name);
  public String id();
  public int random(int n1, int n2);

  public String rewriteURL(document,String id_name);
  public String rewriteURL(document,String id_name,String id_value);

  
  create(創建):能夠讓你在運行時創建某個對象的實例:

  參數為:

   - 新的對象名
   - 類名
   - 參數列表 (假如你使用默認構造函數的時候,可以為空)。

  返回值:

   - 根據創建的接過返回true 或 false

  例如:

  
  <script language="JavaScript">
  <!--創建myHash 作為一個新的哈希表Hashtable -->
  java.JinJ.create("myHash","java.util.Hashtable");

  <!-- 使用myHash -->
  java.myHash.put('key1','shop1');
  </script>

  delete:讓你刪除任何對象的實例。
  參數為:
  - 對象名

  例如:
  <script language="JavaScript">
  <!-- 刪除myHash -->
  java.JinJ.delete("myHash");
  </script>

  exists:查看對象的實例是否存在。
  參數為:
  - 對象名
  返回值:
  true 或 false

  例如:
  <script language="JavaScript">
  if (java.JinJ.exists("myHash")=='false')
  {
  <!--創建myHash 作為一個新的哈希表Hashtable -->
  java.JinJ.create(myHash,"java.util.Hashtable");

  <!--使用myHash -->
  java.myHash.put('key1','shop1');
  }
  </script>

  id: 返回唯一的標示符,比如你可以在支持session的程序中使用這個函數。
  Random: 從給定的數域中返回隨機值:
  例如:
  <script language="JavaScript">
  var sessionId=java.JinJ.id();

  <!-- 從1到10中的隨機數 -->
  var randValue=java.JinJ.random(1,10);
  </script>

  rewriteURL:能夠讓你使用session。你可以用<a href="some_url? id_name=id_value">你的鏈接</a>來替代<a href="some_url">你的鏈接</a>這同樣適用於任何形式的動作。你可以只設置一個參數名,參數值將自動生成,也可以同時設置參數名和參數值:
  例如:
  <script language="JavaScript">

  <!--添加sessionId=某個值到這個鏈接 -->
  java.JinJ.rewriteURL(document,'sessionId');

  <!-- 添加 id=12345 到這個鏈接-->
  java.JinJ.rewriteURL(document,'id',12345);

  </script>

  我們還要能夠分析讀入Java函數的參數,對於一個參數我們必須知道它的數據類型,為了簡單起見,我們就認為有四種數據類型整型,浮點型,布爾型其余的全歸於字符串型,你可以看到,這在程序中都有相應的解釋。

  例如:

   

  <!-- 我們假定A(int,float,String,boolean) -->
   java.myClass.myFunc(2, 5.6, a123, true);

  
  為了保證你傳遞的參數是一個字符串型的值的話,請你使用"或者',如:

   

  <!--總是作為字符串型數據傳遞-->
  java.myClass.myFunc("256");

   

  函數返回的結果問題

  假如Java函數的類型為void的話,那麼將返回給JavaScript一個空字符串,在別的情況下(假如不是數組),將返回Java對象的字符型返回值。假如你的Java函數返回數組或者向量(Vector)或枚舉(Enumeration),結果將被表示為JavaScript中的數組。例如:在類dbpool中,你假如有某個函數performQuery(some_sql_string)來通過JDBC來調用SQL查詢,將轉換ResultSet成為數組(或向量)然後把這個數組返回給JavaScript。

   

  res=java.dbpool.performQuery("select * from emp");
  first=res[0];
  second=res[1];

  
  程序還應該實現控制台(JINJ控制台),這樣你就可以直接從浏覽器中運行這個Servlet,並且可以創建/刪除對象,相應的命令是: http://your_host/servlet/JINJ?your_password

  或者,假如你使用擴展名映射JinJ的話,則::

  http://your_host/your_file.JinJ?your_password ,這些都應當在程序中體現,你可以在servlet的初始化參數中設置口令,參數名是admin. 如:

  
  JINJ.code=JINJ
  JINJ.initparams=admin=secret,
  servlet=http://myhost/servlet/JINJ,
  root=/home/www/pub,
   objects=/home/load/obj.txt,
   codebase=http://myhost/
  默認的密碼值是abcd,所以使用JINJ?abcd 將運行治理員界面,通過這一頁,你可以刪除或者創建新的對象的實例。

  下面,然我們來看看具體在Java代碼上如何實現我們的構思:

  JinJ.java

  import java.io.*;
  import java.lang.reflect.*;
  import java.util.*;
  import javax.servlet.*;
  import javax.servlet.http.*;

  public class JinJ extends HttpServlet
  { public JinJ()
  {
  }

  
  public void init(ServletConfig servletconfig)//初始化
  throws ServletException
  {
  super.init(servletconfig);
  inst = new Hashtable();
  cls = new Hashtable();
  NEWLINE = System.getProperty("line.separator"); file://獲取行分割符在本系統中的屬性值,例如在UNIX下為
  separator = System.getProperty("file.separator");//獲取文件分割符在本系統中的屬性值,例如在UNIX下為/

  if((THIS_SERVLET = getInitParameter("servlet")) == null)
  file://getInitParameter方法,返回一個字符串,包含命名的初始化參數的值,假如參數不存在則為空。
  THIS_SERVLET = "";
  if((admin = getInitParameter("admin")) == null)
  admin = "abcd";
  if((DOCUMENT_ROOT = getInitParameter("root")) == null)
  DOCUMENT_ROOT = "";
  if(DOCUMENT_ROOT.length() > 0 && !DOCUMENT_ROOT.endsWith(separator))
  file://假如DOCUMENT_ROOT的長度為正值,並且不以文件分割符結尾則
  DOCUMENT_ROOT = DOCUMENT_ROOT + separator;
  if((CODEBASE = getInitParameter("codebase")) == null)
  CODEBASE = "";
  JAVA_FILE = getInitParameter("objects");
  if(JAVA_FILE != null && inst != null)
  loadJava(JAVA_FILE);
  }

  private void loadJava(String s)
  {
  System.out.println("從" + s +"調用Java對象 ");
  try
  {
  BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(new FileInputStream(s)));
  file://創建一個文件輸入流緩沖區
  String s1;
  file://開始分析文件
  while((s1 = bufferedreader.readLine()) != null)//每次讀入一行
  {
  s1 = s1.trim(); file://把字符串兩端的空格去掉
  /*********************************************************
  * 假如以";"結尾則去掉";"
  **********************************************************/
  if(s1.endsWith(";"))
  s1 = s1.substring(0, s1.length() - 1).trim();
  /*****************************************************************************
  * 假如s1的長度大於零,並且第一個字符不為#和//,則調用processLine處理這一行參數
  ******************************************************************************/
  if(s1.length() > 0 && s1.charAt(0) != '#' && !s1.startsWith("//"))
  processLine(s1);
  }

  bufferedreader.close();
  return;
  }
  catch(Exception _ex)
  {
  return;
  }
  }

  private void processLine(String s)
  {
  /**************************************************************************
  *取得這一行中第一次出現等號的下標值,假如沒出現等號則返回-1
  *假如沒有等號,則輸出錯誤信息
  **************************************************************************/
  int i = s.indexOf("=");
  if(i <= 0 i == s.length() - 1)
  {
  System.out.println("不能處理此行信息: " + s);
  return;
  }
  String s1 = s.substring(0, i).trim();//s1為s中等號前的字符串
  String s2 = s.substring(i + 1).trim();//s2為s中等號後的字符串
  if(s2.startsWith("new "))//判定s2是否以new開頭,如new class_name(list_of_parameters);
  s2 = s2.substring("new".length()).trim();
  if(s1.length() == 0 s2.length() == 0)
  {
  System.out.println("不能處理此行信息: " + s);
  return;
  }
  if(inst.get(s1) != null) file://為了防止重復定義類名
  {
  System.out.println("重復命名 " + s1);
  return;
  }
  i = s2.indexOf("(");
  if(i <= 0 && !s2.endsWith(")"))
  {
  System.out.println("不能處理此行信息:" + s);
  return;
  }
  String s3 = s2.substring(0, i).trim();//s3為新定義的類名
  s2 = s2.substring(i + 1, s2.length() - 1).trim();//s2為參數列表
  if(inst.size() < 5)
  processLine1(s1, s3, s2, s);
  }

   

  
  private String prepareString(String s)
  {
  if(s == null)
  return null;
  if(s.length() < 2)
  return s;
  if(s.charAt(0) == '"' && s.charAt(s.length() - 1) == '"') file://假如字符串s以"開頭,又以"結尾,則把兩頭的"去掉
  return s.substring(1, s.length() - 1);
  if(s.startsWith("'") && s.endsWith("'"))//假如字符串s以'開頭,又以'結尾,則把兩頭的"去掉
  return s.substring(1, s.length() - 1);
  else
  return s;
  }

  private boolean processLine1(String s, String s1, String s2, String s3)
  { file://創建一個Object類的實例
  Object obj[] = {
  null, null
  };
  Class class1;
  if((class1 = (Class)cls.get(s1)) == null)
  try
  {
  class1 = Class.forName(s1);//返回具有s1指定的類名的類的Class描述符
  cls.put(s1, class1); file://放回哈西表
  }
  catch(Exception _ex)
  {
  System.out.println("不能裝載類 " + s1);
  return false;
  }
  obj[0] = class1;
  if(s2.length() == 0)
  {
  try
  {
  obj[1] = class1.newInstance();// 創建類的新實例
  }
  catch(NoSuchMethodError _ex)
  {
  System.out.println("不能創建對象的實例 " + s3);
  return false;
  }
  catch(Exception _ex)
  {
  System.out.println("不能創建對象的實例 " + s3);
  return false;
  }
  inst.put(s, ((Object) (obj)));
  }
  else
  {
  Object obj1[] = getParamArray(s2, 0); file://取得參數列表
  if(obj1 == null)
  {
  System.out.println("不能處理這行參數: " + s3);
  return false;
  }
  try
  {
  Constructor cons = class1.getConstructor((Class[])obj1[0]);//使用參數列表構建類構建器
  if(class1 == null)
  {
  System.out.println("不能創建對象的實例 " + s3);
  return false;
  }
  obj[1] = cons.newInstance((Object[])obj1[1]);
  inst.put(s, ((Object) (obj)));
  }
  catch(Exception _ex)
  {
  System.out.println("不能創建對象的實例 " + s3);
  return false;
  }
  }
  return true;
  }

   

  private Object[] getParamArray(String s, int i) file://取得s中所包含的參數列表,存入一個Object數組中
  {
  String s1 = s.trim(); file://去除末尾的空格
  String s6 = ",";
  Vector vector = new Vector();
  if(s1.length() > 0)
  {
  if(s1.charAt(0) == '(')//去掉(
  s1 = s1.substring(1);
  if(s1.endsWith(")"))//去掉)
  s1 = s1.substring(0, s1.length() - 1);
  String s2 = s1.trim(); file://去掉字符串後的空格
  if(s2.length() == 0 && i == 0) file://假如s2長度為零,說明沒有參數
  return null;
  String s4;
  if(s2.length() > 0)
  {
  if(s2.charAt(0) == '"')//假如s2以"開頭,則用"代替
  s6 = """;
  else
  if(s2.charAt(0) == ''')//假如s2以'開頭,則用'代替
  s6 = "'";
  else
  s6 = ",";
  s4 = s2.substring(0, 1); file://取得s2的第一個字符
  s2 = s2.substring(1);//取得s2的第二個字符往後的字符
  }
  else
  {
  s4 = "";
  }
  for(; s2.length() > 0; s2 = s2.substring(1))//這些語句是為了把參數表中的參數分離出來
  {
  String s5 = s2.substring(0, 1);//取得s2的第一個字符
  if(s5.equals(s6)) file://假如s5和s6相等,即判定s5是否為兩個參數的分隔符
  {
  if(s6.equals(""") s6.equals("'"))//假如s6為"或',則
  s4 = s4 + s6;
  vector.addElement(s4); file://把s4(即一個參數值)加入vector中
  s2 = s2.substring(1).trim();
  s4 = "";
  if(s2.length() == 0)
  break;
  s4 = s2.substring(0, 1);
  if(s4.charAt(0) == ',')
  file://假如s4以","開頭,則判定s4是否以分隔符開頭
  {
  s2 = s2.substring(1).trim();
  s4 = "";
  if(s2.length() == 0)
  break;
  s4 = s2.substring(0, 1);
  }
  if(s4.charAt(0) == '"')
  s6 = """;
  else
  if(s4.charAt(0) == ''')
  s6 = "'";
  else
  s6 = ",";
  }
  else
  {
  s4 = s4 + s5;
  }
  }

  if(s4.length() > 0)
  vector.addElement(s4);
  }
  int j = vector.size(); file://取得向量變量vector的大小,vector中保存的都是參數值
  if(j == 0 && i == 0)
  return null; file://沒有參數
  Object aobj[] = new Object[3];
  Class class1[] = new Class[j + i];
  Object aobj1[] = new Object[j + i];
  aobj[0] = class1;
  aobj[1] = ((Object) (aobj1));
  aobj[2] = new Integer(j + i);
  for(int k = i; k < j + i; k++)
  {
  String s3 = (String)vector.elementAt(k - i);
  try
  file://以下的代碼是為了判定,每個參數到底是什麼數據類型
  { file://判定是否為整型
  Integer integer = Integer.valueOf(s3);
  class1[k] = Integer.TYPE;
  aobj1[k] = integer;
  }
  catch(Exception _ex)
  {
  try
  { file://判定是否為浮點型
  Float float1 = Float.valueOf(s3);
  class1[k] = Float.TYPE;
  aobj1[k] = float1;
  }
  catch(Exception _ex2)
  { file://判定是否為布爾類型
  s3 = prepareString(s3);
  if(s3.equals("true")) file://判定是否為真
  {
  class1[k] = Boolean.TYPE;
  aobj1[k] = new Boolean(true);
  }
  else
  if(s3.equals("false")) file://判定是否為假
  {
  class1[k] = Boolean.TYPE;
  aobj1[k] = new Boolean(false);
  }
  else
  {
  class1[k] = class$java$lang$String == null ? (class$java$lang$String = class$("java.lang.String")) : class$java$lang$String;
  aobj1[k] = s3;
  }
  }
  }
  }

  vector = null;
  return aobj;
  }

   

  
  public void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
  throws ServletException, IOException
  {
  doGet(httpservletrequest, httpservletresponse);
  }

  public void doGet(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
  throws ServletException, IOException
  {
  String s = "";
  String s1 = "";
  s = HttpUtils.getRequestURL(httpservletrequest).toString();
  file://返回一個字符串,包含請求字符串中包含的協議名,主機名,端口號以及路徑,但是不包含請求的內容
  int i;
  if((i = s.indexOf("?")) > 0)//去掉s結尾的問號
  s = s.substring(0, i);
  s1 = httpservletrequest.getQueryString();//取的請求字符串的請求內容
  if(s1 == null)
  {
  parseFile(s1, httpservletrequest, httpservletresponse);
  return;
  }
  if(s1.equals(admin)) file://假如請求串等於admin
  {
  adminPage(httpservletrequest, httpservletresponse, s); file://進入治理員界面
  return;
  }
  if(s1.equals("namiotde")) file://假如請求串為namiotde,則執行相應的執行命令
  {
  executeRequest(httpservletrequest, httpservletresponse);
  return;
  }
  String s2 = getFromQuery(s1, "what="); file://取的動作的屬性值
  if(s2.equals("hframe"))
  {
  getHiddenFrame(httpservletrequest, httpservletresponse);//轉到隱藏幀
  return;
  }
  if(s2.equals("mframe"))
  {
  getMainFrame(s1, httpservletrequest, httpservletresponse); file://轉到主幀
  return;
  }
  else
  {
  parseFile(s1, httpservletrequest, httpservletresponse);
  return;
  }
  }
  file://治理員界面,執行添加刪除對象的操作
  private void adminPage(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse, String s)
  throws IOException
  {
  PrintWriter printwriter = httpservletresponse.getWriter();
  String s1 = "";
  String s4 = httpservletrequest.getParameter("what"); file://返回請求串中what,即動作的屬性值
  if(s4 != null)
  if(s4.equals("delete")) file://假如what的值為delete,則執行相應的操作
  {
  for(Enumeration enumeration = httpservletrequest.getParameterNames(); enumeration.hasMoreElements();)
  {
  String s2 = (String)enumeration.nextElement();
  if(s2.startsWith("_"))
  {
  inst.remove(s2.substring(1));
  s1 = s1 + " " + s2.substring(1);
  }
  }

  if(s1.length() > 0)
  s1 = "刪除: " + s1;
  }
  else
  if(s4.equals("add")) file://假如what的值為add,則執行相應的操作
  {
  String s5 = httpservletrequest.getParameter("oname");//取的對象名
  String s6 = httpservletrequest.getParameter("JinJ"); file://取得類名
  String s7 = httpservletrequest.getParameter("params"); file://取得參數
  if(s5 == null)
  s5 = "";
  else
  s5 = s5.trim();
  if(s6 == null)
  s6 = "";
  else
  s6 = s6.trim();
  if(s7 == null)
  s7 = "";
  else
  s7 = s7.trim();
  if(s7.length() > 0 && !s7.startsWith("("))
  s7 = "(" + s7 + ")";
  if(s5.length() > 0 && s6.length() > 0 && inst.size() < 5)
  {
  String s3 = s5 + "=new " + s6 + s7;//寫成標准的對象實例化形式
  if(processLine1(s5, s6, s7, s3))
  s1 = s5 + " 被載入...";
  else
  s1 = "不能載入" + s3;
  }
  }
  httpservletresponse.setContentType("text/html");
  printwriter.println("<html>");
  printwriter.println("<head>");
  printwriter.println("<title>JinJ 控制台</title>");
  printwriter.println("</head>");
  printwriter.println("<body bgcolor="#FFFFFF">");
  printwriter.println(setScript());
  if(s1.length() > 0)
  printwriter.println("<br><i>" + s1 + "</i><br>");
  printwriter.println("<h2><center>對象</center></h2>");
  printwriter.println("<br>");
  printwriter.println(objectsTable(s));
  printwriter.println("</body>");
  printwriter.println("</html>");
  }

   

  private String setScript()
  {
  StringBuffer stringbuffer = new StringBuffer();
  stringbuffer.append("<script language="JavaScript">" + NEWLINE);
  stringbuffer.append("function fun(what)" + NEWLINE);
  stringbuffer.append("{ document.mf.what.value=what; document.mf.submit(); }" + NEWLINE);
  stringbuffer.append("</script>" + NEWLINE);
  return stringbuffer.toString();
  }

  private String objectsTable(String s)
  {
  StringBuffer stringbuffer = new StringBuffer();
  String s2 = "#D5E6E1";
  stringbuffer.append("<form name="mf" method=post action="" + s + "?" + admin + "">" + NEWLINE);
  stringbuffer.append("<input type=hidden name="what">" + NEWLINE);
  stringbuffer.append("<table width=98% border=0>");
  stringbuffer.append("<tr bgcolor=#CCCCFF><td nowrap> </td><td nowrap>對象名</td><td nowrap>類名</td></tr>" + NEWLINE);
  for(Enumeration enumeration = inst.keys(); enumeration.hasMoreElements();)
  {
  String s1 = (String)enumeration.nextElement();
  Object aobj[] = (Object[])inst.get(s1);
  stringbuffer.append("<tr bgcolor="" + s2 + "">");
  stringbuffer.append("<td width=5 nowrap>");
  stringbuffer.append("<input type=checkbox name="_" + s1 + "">");
  stringbuffer.append("</td>");
  stringbuffer.append("<td nowrap>" + s1 + "</td><td nowrap>" + aobj[0] + "</td></tr>" + NEWLINE);
  if(s2.equals("#D5E6E1"))
  s2 = "#F7F7F7";
  else
  s2 = "#D5E6E1";
  }

  stringbuffer.append("</table>" + NEWLINE);
  stringbuffer.append("<br><br>");
  stringbuffer.append("<table>" + NEWLINE);
  stringbuffer.append("<tr>");
  if(inst.size() > 0)
  stringbuffer.append("<td align=left nowrap><input type=button value=Delete onClick="fun('delete');"></td>");
  else
  stringbuffer.append("<td nowrap> </td>");
  stringbuffer.append("<td nowrap> </td>");
  stringbuffer.append("<td align=right nowrap>對象名 <input type=text size=10 name="oname"> 類名 <input type=text size=18 name="JinJ"> 參數 <input type=text name="params"> ");
  stringbuffer.append("<input type=button value=Add onClick="fun('add');"></td></tr>");
  stringbuffer.append("</table>" + NEWLINE);
  stringbuffer.append("</form>");
  return stringbuffer.toString();
  }
  file://分析文件
  private void parseFile(String s, HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
  throws IOException
  {
  String s1 = getUrl(httpservletrequest);
  String s2 = getFile(s, httpservletrequest);
  httpservletresponse.setContentType("text/html");
  PrintWriter printwriter = httpservletresponse.getWriter();
  printwriter.println("<html>");
  if(s1 == null)
  {
  printwriter.println("<br>找不到servlet名.請檢查初始參數");
  }
  else
  {
  printwriter.println("<frameset rows="*,100%" border=0>");
  printwriter.println("<frame name="hframe" src="" + s1 + "?" + "what" + "=" + "hframe" + "">");
  printwriter.println("<frame name="mframe" src="" + s1 + "?" + "what" + "=" + "mframe" + "&" + "df" + "=" + s2 + "">");
  printwriter.println("</frameset>");
  }
  printwriter.println("</html>");
  printwriter.flush();
  printwriter.close();
  }

   

  
  private String getId()//取ID命令,使用當前的時間配合隨機數產生的是唯一值
  {
  String s = "";
  synchronized(SessionIdLock)
  {
  long l = System.currentTimeMillis();
  Random random = new Random();
  s = String.valueOf(l);
  for(int i = 1; i <= 6; i++)
  s = s + (int)(1.0D + 6D * random.nextDouble());

  }
  return s;
  }

  private String randomValue(String s, String s1)//取隨機數
  {
  Random random = new Random();
  int i;
  int j;
  try
  {
  i = Integer.parseInt(s);
  j = Integer.parseInt(s1);
  }
  catch(Exception _ex)
  {
  return "對於random()無效的參數值";
  }
  return String.valueOf((int)((double)i + (double)j * random.nextDouble()));
  }

  private void executeRequest(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse) file://執行請求
  throws IOException
  {
  String s = httpservletrequest.getParameter("params"); file://返回參數params的值
  String s2 = "";
  String s3 = "";
  String s4 = "";
  Object aobj[] = {
  null, null
  };
  int i = s.indexOf("@#$");
  String s1 = s.substring(0, i); file://取出"@#$"前的字符串
  if(s.length() <= i + "@#$".length()) file://假如大於的話,說明@#$後還有其他的字符
  s2 = "";
  else
  for(s = s.substring(i + "@#$".length()).trim(); s.length() > 0;)
  {
  i = s.indexOf("@#$");
  if(i < 0)
  {
  if(s2.length() > 0)
  s2 = s2 + ",";
  s2 = s2 + s;
  s = "";
  }
  else
  {
  if(s2.length() > 0)
  s2 = s2 + ",";
  s2 = s2 + s.substring(0, i);
  if(s.length() <= i + "@#$".length())
  s = "";
  else
  s = s.substring(i + "@#$".length()).trim();
  }
  }

  i = s1.indexOf(".");
  if(i > 0 && i < s1.length() - 1)
  {
  s3 = s1.substring(0, i);
  s1 = s1.substring(i + 1);
  }
  if(s3.equals("j2j"))
  {
  if(s1.equals("exists")) file://exists命令
  {
  if(s2.length() == 0) file://參數為零顯然是錯誤的
  {
  s4 = "錯誤的標准函數調用";
  }
  else
  {
  if((i = s2.indexOf(",")) > 0)
  s2 = s2.substring(0, i);
  s4 = String.valueOf(inst.get(s2) != null);//判定是否存在s2對象
  }
  }
  else
  if(s1.equals("delete")) file://delete函數
  {
  if(s2.length() == 0)
  {
  s4 = "錯誤的標准函數調用";
  }
  else
  {
  if((i = s2.indexOf(",")) > 0)
  s2 = s2.substring(0, i);
  inst.remove(s2); file://刪除s2對象
  s4 = "";
  }
  }
  else
  if(s1.equals("create")) file://create函數,創建新的對象的實例
  {
  if(s2.length() == 0 (i = s2.indexOf(",")) < 0)
  {
  s4 = "錯誤的標准函數調用";
  }
  else
  {
  String s8 = s2.substring(0, i); file://s8為對象名
  s2 = s2.substring(i + 1);
  String s9;
  if((i = s2.indexOf(",")) < 0)
  {
  s9 = s2; file://假如沒有構造參數列表則s9(類名)就等於s2
  s2 = "";
  }
  else
  {
  s9 = s2.substring(0, i); file://否則,s9(類名)為兩個逗號之間的字符串
  s2 = s2.substring(i + 1); file://s2是構造參數列表
  }
  if((aobj = (Object[])inst.get(s8)) != null)
  {
  s4 = "false";
  }
  else
  {
  String s5 = s8 + "=new " + s9 + "(" + s2 + ")"; file://s5為一標准java對象實例化形式,送入processLine1處理
  s4 = String.valueOf(processLine1(s8, s9, s2, s5));
  }
  }
  }
  else
  if(s1.equals("id"))//id命令
  s4 = getId();
  else
  if(s1.equals("random")) file://random命令
  {
  if((i = s2.indexOf(",")) < 0) file://假如沒有兩個參數的話,出錯
  s4 = "錯誤的標准函數調用";
  else
  s4 = randomValue(s2.substring(0, i), s2.substring(i + 1)); file://取隨機值
  }
  else
  {
  s4 = "錯誤的標准函數調用";
  }
  }
  else
  if((aobj = (Object[])inst.get(s3)) == null)
  {
  s4 = "不能發現" + s3+ "的實例";
  }
  else
  {
  Class class1 = (Class)aobj[0];
  Object obj = aobj[1];
  try
  {
  if(s2.length() > 0)
  {
  Object aobj1[] = getParamArray(s2, 0); file://從s2中取出參數列表
  Method method = class1.getMethod(s1, (Class[])aobj1[0]);
  Object obj2 = method.invoke(obj, (Object[])aobj1[1]);
  if(method.getReturnType().getComponentType() == null)
  {
  String s6 = method.getReturnType().toString();
  if(s6.indexOf("java.util.Vector") > 0)//判定s6中是否有java.util.Vector
  {
  if(obj2 == null)
  {
  s4 = "";
  }
  else
  {
  Vector vector = (Vector)obj2;
  if(vector.size() == 0)
  {
  s4 = "";
  }
  else
  {
  for(int j = 0; j < vector.size(); j++)
  {
  s4 = s4 + "@#$";
  s4 = s4 + (String)vector.elementAt(j);
  }

  }
  }
  }
  else
  if(s6.indexOf("java.util.Enumeration") > 0)
  {
  if(obj2 == null)
  {
  s4 = "";
  }
  else
  {
  Enumeration enumeration = (Enumeration)obj2;
  if(!enumeration.hasMoreElements())
  s4 = "";
  else
  while(enumeration.hasMoreElements())
  {
  s4 = s4 + "@#$";
  s4 = s4 + (String)enumeration.nextElement();
  }

  }
  }
  else
  if(obj2 == null)
  s4 = "";
  else
  s4 = String.valueOf(obj2);
  }
  else
  {
  for(int k = 0; k < Array.getLength(obj2); k++)
  {
  s4 = s4 + "@#$";
  if((obj = Array.get(obj2, k)) != null)
  s4 = s4 + obj;
  }

  }
  }
  else
  {
  Method method1 = class1.getMethod(s1, null);
  Object obj3 = method1.invoke(obj, null);
  if(method1.getReturnType().getComponentType() == null)
  {
  String s7 = method1.getReturnType().toString();
  if(s7.indexOf("java.util.Vector") > 0)
  {
  if(obj3 == null)
  {
  s4 = "";
  }
  else
  {
  Vector vector1 = (Vector)obj3;
  if(vector1.size() == 0)
  {
  s4 = "";
  }
  else
  {
  for(int l = 0; l < vector1.size(); l++)
  {
  s4 = s4 + "@#$";
  s4 = s4 + (String)vector1.elementAt(l);
  }

  }
  }
  }
  else
  if(s7.indexOf("java.util.Enumeration") > 0)
  {
  if(obj3 == null)
  {
  s4 = "";
  }
  else
  {
  Enumeration enumeration1 = (Enumeration)obj3;
  if(!enumeration1.hasMoreElements())
  s4 = "";
  else
  while(enumeration1.hasMoreElements())
  {
  s4 = s4 + "@#$";
  s4 = s4 + (String)enumeration1.nextElement();
  }

  }
  }
  else
  if(obj3 == null)
  s4 = "";
  else
  s4 = String.valueOf(obj3);
  }
  else
  {
  for(int i1 = 0; i1 < Array.getLength(obj3); i1++)
  {
  s4 = s4 + "@#$";
  Object obj1;
  if((obj1 = Array.get(obj3, i1)) != null)
  s4 = s4 + obj1;
  }

  }
  }
  }
  catch(Exception _ex)
  {
  s4 = "不能從類 "+ class1.getName()+ "中調用"+ s1;
  }
  if(s4 == null)
  s4 = "";
  }
  PrintWriter printwriter = httpservletresponse.getWriter();
  httpservletresponse.setContentType("text/html");
  printwriter.println(s4);
  printwriter.flush();
  printwriter.close();
  }

  private void getMainFrame(String s, HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
  throws IOException
  {
  PrintWriter printwriter = httpservletresponse.getWriter();
  String s1 = getFromQuery(s, "df="); file://取得數據文件所在的路徑和文件名
  httpservletresponse.setContentType("text/html");
  if(s1.length() == 0)
  printwriter.println("<html><br>不能打開數據文件</html>");
  else
  try
  { file://打開數據文件
  BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(new FileInputStream(s1)));
  String s2;
  while((s2 = bufferedreader.readLine()) != null)
  {
  int i;
  while((i = s2.indexOf("java.")) > 0)
  {
  String s3 = s2.substring(0, i) + "parent." + "hframe" + ".javabridge('";
  String s4;
  for(s4 = s2.substring(i + "java.".length()); s4.length() > 0; s4 = s4.substring(1))
  {
  if(s4.charAt(0) == '(')
  {
  s3 = s3 + "'";
  s4 = s4.substring(1);
  break;
  }
  s3 = s3 + s4.substring(0, 1);
  }

  if(needComma(s4))
  s3 = s3 + ",";
  s2 = s3 + s4;
  }

  printwriter.println(s2);
  }

  bufferedreader.close();
  }
  catch(Exception _ex)
  {
  printwriter.println("不能讀取數據文件" + s1);
  }
  printwriter.flush();
  printwriter.close();
  }
  file://取得隱藏幀
  private void getHiddenFrame(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)
  throws IOException
  {
  String s = getId(); file://取得ID
  PrintWriter printwriter = httpservletresponse.getWriter();
  httpservletresponse.setContentType("text/html");
  file://調用applet bridge
  printwriter.println("<html>");
  printwriter.println("<applet code="bridge.class" codebase="" + CODEBASE + "" width=10 height=10>");
  printwriter.println("<param name="servlet" value="" + getUrl(httpservletrequest) + "">");
  printwriter.println("</applet>");
  printwriter.println("<script language="JavaScript">");
  printwriter.println("function javabridge(fName)");
  printwriter.println("{");
  printwriter.println(" var s='';");
  printwriter.println(" if (fName=='jinj.rewriteURL' && javabridge.arguments.length>2)");
  printwriter.println(" {");
  printwriter.println(" if (javabridge.arguments.length==3)");
  printwriter.println(" return rewriteURL(javabridge.arguments[1],javabridge.arguments[2]);");
  printwriter.println(" else");
  printwriter.println(" return rewriteURL(javabridge.arguments[1],javabridge.arguments[2],javabridge.arguments[3]);");
  printwriter.println(" }");
  printwriter.println(" for (i=1;i<javabridge.arguments.length;i++)");
  printwriter.println(" { if (s!='') { s+='@#$';}");
  printwriter.println(" s+=javabridge.arguments[i]; }");
  printwriter.println(" s=document.applets[0].fromJava(fName,s);");
  printwriter.println(" i=s.indexOf('@#$');");
  printwriter.println(" if (i<0) return s;");
  printwriter.println(" ans=new Array(); s=s.substring(3); i=s.indexOf('@#$'); j=0;");
  printwriter.println(" while (i>=0)");
  printwriter.println(" { ans[j]=s.substring(0,i); j=j+1; s=s.substring(i+3); i=s.indexOf('@#$'); }");
  printwriter.println(" ans[j]=s; return ans; ");
  printwriter.println("}");
  printwriter.println("function rewriteURL1(s,id)");
  printwriter.println("{");
  printwriter.println("if (s.indexOf('?')>0) return s+'&'+id+'='+'" + s + "';");
  printwriter.println("return s+'?'+id+'='+'" + s + "';");
  printwriter.println("}");
  printwriter.println("function rewriteURL2(s,id,vl)");
  printwriter.println("{");
  printwriter.println("if (s.indexOf('?')>0) return s+'&'+id+'='+vl;");
  printwriter.println("return s+'?'+id+'='+vl;");
  printwriter.println("}");
  printwriter.println("function rewriteURL(doc)");
  printwriter.println("{");
  printwriter.println(" i=rewriteURL.arguments.length;");
  printwriter.println(" if (i>1)");
  printwriter.println(" {");
  printwriter.println(" tmp=rewriteURL.arguments[1];");
  printwriter.println(" for (j=0; j<doc.links.length; j++)");
  printwriter.println(" {");
  printwriter.println(" s=doc.links[j].href;");
  printwriter.println(" if (s.indexOf(tmp+'=')<0)");
  printwriter.println(" {");
  printwriter.println(" if (i==2) doc.links[j].href=rewriteURL1(s,tmp);");
  printwriter.println(" else doc.links[j].href=rewriteURL2(s,tmp,rewriteURL.arguments[2]);");
  printwriter.println(" }");
  printwriter.println(" }");
  printwriter.println(" for (j=0; j<doc.forms.length; j++)");
  printwriter.println(" {");
  printwriter.println(" s=doc.forms[j].action;");
  printwriter.println(" if (s.indexOf(tmp+'=')<0)");
  printwriter.println(" {");
  printwriter.println(" if (i==2) doc.forms[j].action=rewriteURL1(s,tmp);");
  printwriter.println(" else doc.forms[j].action=rewriteURL2(s,tmp,rewriteURL.arguments[2]);");
  printwriter.println(" }");
  printwriter.println(" }");
  printwriter.println(" }");
  printwriter.println(" return " + s + ";");
  printwriter.println("}");
  printwriter.println("</script>");
  printwriter.println("</html>");
  printwriter.flush();
  printwriter.close();
  }

  private String getFile(String s, HttpServletRequest httpservletrequest)
  {
  String s1 = httpservletrequest.getRequestURI();
  String s2 = "";
  if(s1.endsWith("jinj") s1.endsWith("JinJ.class"))
  {
  if(s == null)
  return null;
  s1 = getFromQuery(s, "df=");
  if(s1.length() == 0)
  s2 = s;
  else
  s2 = s1;
  }
  else
  {
  s2 = s1;
  }
  if(s2 == null)
  return s2;
  if(s2.length() == 0)
  return s2;
  if(s2.charAt(0) == '/')
  s2 = s2.substring(1);
  return DOCUMENT_ROOT + s2.replace('/', separator.charAt(0));
  }

  private String getUrl(HttpServletRequest httpservletrequest)
  {
  if(THIS_SERVLET.length() > 0)
  return THIS_SERVLET;
  String s1 = httpservletrequest.getRequestURI();
  String s = HttpUtils.getRequestURL(httpservletrequest).toString();
  int i;
  if((i = s.indexOf("?")) > 0)
  s = s.substring(0, i);
  if(s1.endsWith("JinJ") s1.endsWith("JinJ.class"))
  return s;
  else
  return null;
  }

  private boolean needComma(String s) file://判定是否缺少括號
  {
  String s1 = s.trim();
  if(s1.length() == 0)
  return true;
  return s1.charAt(0) != ')';
  }

   

  
  private String getFromQuery(String s, String s1)
  {
  if(s == null)
  return "";
  int i;
  if((i = s.indexOf(s1)) < 0)
  return "";
  String s2 = s.substring(i + s1.length());
  if((i = s2.indexOf("&")) < 0)
  return s2;
  else
  return s2.substring(0, i);
  }

   

  
  static Class class$(String s)
  {
  try
  {
  return Class.forName(s);
  }
  catch(ClassNotFoundException classnotfoundexception)
  {
  throw new NoClassDefFoundError(classnotfoundexception.getMessage());
  }
  }

  public static Object SessionIdLock = new Object();
  private static final int HOW_LONG = 6;
  private static final String CLASSNAME = "JinJ";
  private static final String STDLIB = "jinj";
  private static final String EXISTS = "exists";
  private static final String DELETE = "delete";
  private static final String CREATE = "create";
  private static final String ID = "id";
  private static final String RANDOM = "random";
  private static final String BRIDGE = "bridge.class";
  private static String NEWLINE = " ";
  private static String separator;
  private static final String HFRAME = "hframe";
  private static final String MFRAME = "mframe";
  private static final String EXECUTE = "namiotde";
  private static final String ACTION = "what";
  private static final String DATAFILE = "df";
  private static final String PARAMS = "params";
  private static final String PARAM_DELIMETER = "@#$";
  private static final String SERVLET = "servlet";
  private static final String ROOT = "root";
  private static final String OBJECTS = "objects";
  private static final String BASE = "codebase";
  private static final String ADMIN = "admin";
  private static final String DEFADMIN = "abcd";
  private static String admin;
  private static String THIS_SERVLET = "";
  private static String DOCUMENT_ROOT = "";
  private static String JAVA_FILE = "";
  private static String CODEBASE = "";
  private static final String NEW = "new";
  private static final String JAVA_CALL = "java.";
  private static final int TYPES = 0;
  private static final int VALUES = 1;
  private static final int DIM = 2;
  private static final String ODD = "#D5E6E1";
  private static final String EVEN = "#F7F7F7";
  private static final String ADD = "add";
  private static final String OBJNAME = "oname";
  private static Hashtable inst = null;
  private static Hashtable cls = null;
  static Class class$java$lang$String;

  }

   

  bridge.java

  import java.applet.Applet;
  import java.io.*;
  import java.net.*;

  public class bridge extends Applet
  {

  public void init()
  {
  super.init();
  bridge_servlet = getParameter("servlet");
  }

  public String fromJava(String s, String s1)
  {
  String s2 = "";
  try
  {
  URL url = new URL(bridge_servlet + "?" + "namiotde");
  URLConnection urlconnection = url.openConnection();
  urlconnection.setDoOutput(true);
  urlconnection.setDoInput(true);
  urlconnection.setUseCaches(false);
  urlconnection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
  PrintWriter printwriter = new PrintWriter(urlconnection.getOutputStream());
  printwriter.print("params=" + URLEncoder.encode(s + "@#$" + s1));
  printwriter.close();
  BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(urlconnection.getInputStream()));
  s2 = bufferedreader.readLine();
  bufferedreader.close();
  }
  catch(Exception _ex)
  {
  return "Can not connect to " + bridge_servlet;
  }
  return s2;
  }

  public bridge()
  {
  }

  private static final String SERVLET = "servlet";
  private static String bridge_servlet = "";
  private static final String EXECUTE = "namiotde";
  private static final String PARAMS = "params";
  private static final String PARAM_DELIMETER = "@#$";

  }

   


 
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