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servlet基礎

編輯：關於JSP

1．編寫servlet程序，在頁面上輸出HelloWorld

要求：
（1）創建項目之後new—class，自行編寫servlet程序，覆蓋doGet及doPost方法

（2）在web.xml中配置<servlet>及<servlet-mapping>

2．編寫servlet程序讀取表單中的數據

[html] <%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
    </head>

    <body>
        <form method="post" action="ServletTest2">
            <input type="text" name="text" />
            <input type="submit" value="提交">
        </form>
    </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>

[html]
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <servlet-name>helloworld</servlet-name>
        <servlet-class>com.mars.ServletTest</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>helloworld</servlet-name>
        <url-pattern>/helloworld</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>helloworld</servlet-name>
        <url-pattern>/mars/firstTest</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>ServletTest2</servlet-name>
        <servlet-class>com.mars.ServletTest2</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServletTest2</servlet-name>
        <url-pattern>/ServletTest2</url-pattern>
    </servlet-mapping>
</web-app>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
  <servlet-name>helloworld</servlet-name>
  <servlet-class>com.mars.ServletTest</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>helloworld</servlet-name>
  <url-pattern>/helloworld</url-pattern>
</servlet-mapping>
<servlet-mapping>
  <servlet-name>helloworld</servlet-name>
  <url-pattern>/mars/firstTest</url-pattern>
</servlet-mapping>

<servlet>
  <servlet-name>ServletTest2</servlet-name>
  <servlet-class>com.mars.ServletTest2</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>ServletTest2</servlet-name>
  <url-pattern>/ServletTest2</url-pattern>
</servlet-mapping>
</web-app>

[java]
package com.mars;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletTest extends HttpServlet {

    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        out.print("<html><head></head><body>hello world ~~mars</body></html>");
        out.close();
    }

/* protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        out.print("<html><head></head><body>hello world ~~mars</body></html>");
        out.close();
    }*/

}
package com.mars;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletTest extends HttpServlet {

protected void doGet(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
  PrintWriter out = resp.getWriter();
  out.print("<html><head></head><body>hello world ~~mars</body></html>");
  out.close();
}

/* protected void doPost(HttpServletRequest req, HttpServletResponse resp)
   throws ServletException, IOException {
  PrintWriter out = resp.getWriter();
  out.print("<html><head></head><body>hello world ~~mars</body></html>");
  out.close();
}*/

}

要求：

（1）編寫JSP頁面，創建表單，表單中包含“文本框”及“提交”按鈕

（2）編寫servlet程序，在程序中讀取出用戶在表單中輸入的內容，並將其顯示在頁面上

（3）創建servlet 程序時，可采用MyEclipse中直接new—servlet的方式

[java]
package com.mars;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletTest2 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=gbk");
        PrintWriter out = response.getWriter();
        System.out.println("in Get");
        out.println("<HTML>");
        out.println(" <HEAD></HEAD>");
        out.println(" <BODY>");
        out.println("從jsp頁面，獲取信息的示例");
        out.println(request.getParameter("text"));
        out.println(" </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        System.out.println("in Post");
        doGet(request,response);

    }

}