HTTP Status 500 - Cannot call sendRedirect() after the response has been committ

a303274454 2014-10-11 08:31:16

不知道为什么会出现HTTP Status 500 - Cannot call sendRedirect() after the response has been committ

求大神Help！！

TestProject.java内容如下:

package TestProject;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;

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

public class TestProject extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List<String> list=new ArrayList<String>();
List<String> list1=new ArrayList<String>();
String key=null;
String value=null;
boolean bo=true;
boolean bo1=true;
response.setContentType("text/html,charset=gb2312");
String account=request.getParameter("account");
String password=request.getParameter("password");
PrintWriter out = response.getWriter();
Enumeration e=getServletConfig().getInitParameterNames();
while(e.hasMoreElements()){
key=(String)e.nextElement();
list.add(key);
value=getInitParameter(key);
list1.add(value);
}

Iterator<String> it=list.iterator();

if(it.hasNext()){
bo=it.next().equals(account);
}

Iterator<String> it1=list1.iterator();

for(String str: list1){
bo1=str.equals(password);
}

if(bo&&bo1){
out.println("<HTML>");
out.println("<BODY>");
out.println("<table border='0'>");
out.println("<tr>");
out.println("<td align='center'>欢迎来到CSDN中国最大的IT社区</td>");
out.println("</td>");
out.println("<tr>");
out.println("</table>");
out.println("<table border='1'>");
out.println("<tr>");
out.println("<td bgcolor=#66666>技术学习</td>");
out.println("<td bgcolor=#66666>论坛</td>");
out.println("<td bgcolor=#66666>最新资讯</td>");
out.println("<td bgcolor=#66666>博客</td>");
out.println("<td bgcolor=#66666>专业学校</td>");
out.println("<td bgcolor=#66666>成功案例</td>");
out.println("</tr>");
out.println("</table>");
out.println("</BODY>");
out.println("<HTML>");
}else{
out.println("<HTML>");
out.println("<BODY>");
out.println("<p>出错</p>");
out.println("</BODY>");
out.println("</HTML>");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}

MyHtml.html内容如下：

<!DOCTYPE html contextType="text/html" charset="gb2312">
<html>
<head><table border="0">
<div align="center">用户登录界面</div>
</table>
</head>
<body>
<form action="http://localhost:8080/TestProject/servlet/TestProject">
<div align="left" >用户名:
<input type="text" name="account" />
</div>
<div align="left" >密码:
<input type="text" name="password" />
</div>
<div align="left">
<input type="submit" value="登录" name="submit" class="button"/>
</div>
</form>
</body>
</html>

web.xml内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>TestProject</display-name>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>TestProject</servlet-name>
<servlet-class>TestProject.TestProject</servlet-class>
<init-param>
<param-name>zhangxuyu</param-name>
<param-value>201319630221</param-value>
</init-param>
<init-param>
<param-name>303274454</param-name>
<param-value>201319630221</param-value>
</init-param>
</servlet>

<servlet-mapping>
<servlet-name>TestProject</servlet-name>
<url-pattern>/servlet/TestProject</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

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