環境: JDK 5.0 + Tomcat 5.5.4
JDK安裝路徑: D:\Java\jdk1.5.0_01
Tomcat安裝路徑:D:\Tomcat 5.5
設置環境變量(控制面板->系統->高級):
java_home=D:\Java\jdk1.5.0_01
path=%JAVA_HOME%\bin
classpath=.;D:\Java\jdk1.5.0_01\lib\dt.jar;D:\Java\jdk1.5.0_01\lib\tools.jar;D:\Tomcat 5.5\common\lib\servlet-api.jar;D:\Tomcat 5.5\common\lib\mysql-connector-java-3.1.6-bin.jar;
其中D:\Tomcat 5.5\common\lib\servlet-api.jar為Tomcat的servlet API實現,一定要加上,不如無法編譯servlet
D:\Tomcat 5.5\common\lib\mysql-connector-java-3.1.6-bin.jar;是MySQL的JDBC驅動,connect/J 3.1.6,可到MySQL官方網站下載
Tomcat5.5虛擬目錄設定:
D:\Tomcat 5.5\conf\Catalina\localhost下新加一test.xml
內容如下:
<Context path="/test" docBase="d:/www" reloadable="true" crossContext="true" debug="0" >
</Context>
d:\www路徑將是我們測試網站的根目錄,通過http://localhost:8080/test訪問該虛擬目錄
d:\www下建有目錄WEB-INF,下有web.xml設置文件(可參考D:\Tomcat 5.5\webapps\ROOT\WEB-INF\web.xml),classes目錄和lib目錄
//連接數據庫的Java Bean文件名dbconn.java
package NinGoo;
import java.sql.*;
public class dbconn {
public dbconn() {
}
//declare variable
private Connection conn = null;
ResultSet rs = null;
private String server = "127.0.0.1";
private String port = "3306";
private String db = "test";
private String user = "root";
private String pass = "password";
private String drivername="com.mysql.jdbc.Driver";
private String URL="jdbc:mysql://"+server+":"+port+"/"+db+"?user="+user+"&password="+pass;
public Connection getConn(){//get database connection
try{
Class.forName(drivername).newInstance();
conn = DriverManager.getConnection(URL);
}
catch(Exception e){
e.printStackTrace();
}
return this.conn ;
}
public ResultSet executeSQL(String str) {
try{
Statement stmt = conn.createStatement();
rs = stmt.executeQuery(str);
}
catch(Exception e){
e.printStackTrace();
}
return this.rs;
}
}
編譯javac welcome.java,將編譯後的文件welcome.class放到目錄D:\www\WEB-INF\classes\NinGoo\下
//調用Java Bean的servlet welcome.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class welcome extends HttpServlet {
public welcome() {
}
public void doGet(HttpServletRequest Req,HttpServletResponse Res) throws ServletException,IOException {
Res.setContentType("text/html");
Connection conn=null;
Statement stmt=null;
ResultSet rs = null;
try{
NinGoo.database.dbconn myconn =new NinGoo.database.dbconn();
conn = myconn.getConn() ;
rs = myconn.executeSQL("select * from test"); //test是MySQL中的一個table
PrintWriter out=Res.getWriter();
out.println("<html><head><title>test</title></head>");
out.println("<body>");
while(rs.next()) {
out.println(rs.getString(1));
}
out.println("successfule!</body></html>");
}
catch(Exception e){
}
}
}
編譯javac welcome.java,將編譯後的文件welcome.class放到目錄D:\www\WEB-INF\classes下
然後修改D:\www\WEB-INF\web.xml,加入如下設置
<servlet>
<servlet-name>welcome</servlet-name>
<servlet-class>welcome</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>welcome</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>
保存後重啟Tomcat,然後在浏覽器中敲入http://localhost:8080/test/welcome
