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servlet基础

2012-04-27 12:44 274 查看

1．编写servlet程序，在页面上输出HelloWorld

要求：

（1）创建项目之后new—class，自行编写servlet程序，覆盖doGet及doPost方法

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

2．编写servlet程序读取表单中的数据

<%@ 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>

<?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>

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）编写JSP页面，创建表单，表单中包含“文本框”及“提交”按钮

（2）编写servlet程序，在程序中读取出用户在表单中输入的内容，并将其显示在页面上

（3）创建servlet 程序时，可采用MyEclipse中直接new—servlet的方式

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("从jsp页面，获取信息的示例");
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);

}

}

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标签： servlet myeclipse class html jsp encoding

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