java web服务器跳转

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客户端跳转：response.sendRedirect("index.jsp");

example :

servlet.java

package org.lxh.servletdemo;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ClientRedirectDemo extends HttpServlet { // 继承HttpServlet public void doGet(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, java.io.IOException { // 处理服务  req.getSession().setAttribute("name", "李兴华") ; // 设置session属性  req.setAttribute("info", "MJAVA") ; // 设置request属性  resp.sendRedirect("index.jsp") ; // 页面跳转 } public void doPost(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, java.io.IOException { // 处理服务  this.doGet(req, resp);    // 调用doGet() }}

index.jsp：

<%@ page contentType="text/html" pageEncoding="GBK"%>
<html>
<head><title>www.java.cn，高端Java培训</title></head>
<% request.setCharacterEncoding("GBK") ;%>
<body>
<h2>session属性：<%=session.getAttribute("name")%></h2>
<h2>request属性：<%=request.getAttribute("info")%></h2>
</body>
</html>

服务器跳转：

在Servlet中没有像JSP中的“<jsp:forward>”指令，所以，如果要想执行服务器端跳转的话，就必须依靠RequestDispatcher接口完成，此接口中提供了如下的方法：   public void forward (ServletRequest
request,ServletResponseresponse)
 throws ServletException,IOException 
使用RequestDispatcher接口的forward()方法就可以完成跳转功能的实现，但是如果要想使用此接口还需要使用ServletRequest接口提供的如下方法进行实例化 public RequestDispatcher getRequestDispatcher(String path)

example :

使用服务器端跳转

package org.lxh.servletdemo;import javax.servlet.RequestDispatcher;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ServerRedirectDemo extends HttpServlet {  // 继承HttpServlet public void doGet(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, java.io.IOException { // 处理服务  req.getSession().setAttribute("name", "李兴华") ; // 设置session属性  req.setAttribute("info", "MJAVA") ;  // 设置request属性  // 实例化RequestDispatcher对象，同时指定跳转路径  RequestDispatcher rd = req.getRequestDispatcher("index.jsp");  rd.forward(req, resp) ;    // 服务器跳转 } public void doPost(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, java.io.IOException { // 处理服务  this.doGet(req, resp);    // 调用doGet() }}

index.jsp:

接收属性

<%@ page contentType="text/html" pageEncoding="GBK"%><html><head><title>www.java.cn，高端Java培训</title></head> <% request.setCharacterEncoding("GBK") ;%><body> <h2>session属性：<%=session.getAttribute("name")%></h2> <h2>request属性：<%=request.getAttribute("info")%></h2></body></html>