1、前台代码test.jsp提交：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
System.out.println("path="+path);
System.out.println("basePath="+basePath);
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my JSP page. <br>
action的提交路径一定要加上项目名称，否则404。即 <%=basePath %>servlet/WebReturnTest<br>
<form id="opForm" action="<%=basePath %>servlet/WebReturnTest" method="POST">
<table border="0">
<tr>
<td>
<input name="username" value=""/>
<input type="button" name="" value="click" onclick="doSubmit()"/>
</td>
</tr>
</table>
</form>
</body>
<script type="text/javascript">
function doSubmit(){
document.forms[0].submit();//提交
}
function doWhat(){
if(window.clipboardData) {
//清空剪切板
window.clipboardData.clearData();
//复制
window.clipboardData.setData("Text", returnValue);
}
}
</script>
</html>
2、web.xml配置：
<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>WebReturnTest</servlet-name>
<servlet-class>com.ly.tetsWeb.WebReturnTest</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WebReturnTest</servlet-name>
<url-pattern>/servlet/WebReturnTest</url-pattern>
</servlet-mapping>3、后台接收代码：
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;
import javax.servlet.http.HttpSession;
public class WebReturnTest extends HttpServlet {
/**
* Constructor of the object.
*/
public WebReturnTest() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("-----------GET------");
// response.setContentType("text/html");
// PrintWriter out = response.getWriter();
// out
// .println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
// out.println("<HTML>");
// out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
// out.println(" <BODY>");
// out.print(" This is ");
// out.print(this.getClass());
// out.println(", using the GET method");
// out.println(" </BODY>");
// out.println("</HTML>");
// out.flush();
// out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("--------POST---------");
HttpSession session = request.getSession(false);
session.setAttribute("username", "99");
request.getRequestDispatcher("/test2.jsp").forward(request, response);
// response.setContentType("text/html");
// PrintWriter out = response.getWriter();
// out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
// out.println("<HTML>");
// out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
// out.println(" <BODY>");
// out.print(" This is ");
// out.print(this.getClass());
// out.println(", using the POST method");
// out.println(" </BODY>");
// out.println("</HTML>");
// out.flush();
// out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
4、即将跳转的页面test2.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
前台html/jsp如何获得后台session的值？ <br>
通过 var username = "${username}"; 接收后台提交过来的session数据 <br>
111----${username}-----222
</body>
</html>
5、阿里开发手册要求：这一点不是很明白。参考我的链接：阿里Java开发手册的利用，谨防忘记！
