重定向与页面转发

重定向与页面转发

• 参考网址
• 参考网址
• 转发地址栏没有变化；重定向地址栏有变化；
• 转发的是同一次请求;重定向是两次不同请求
• 转发：以前的request中存放的变量不会失效，就像把两个页面拼到了一起。
• 重定向：以前的request中存放的变量全部失效，并进入一个新的request作用域。

demo

chongdingxiang.html

请输入姓名：

chongdingxiang_test.java

package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class Chongdingxiang_test
*/
@WebServlet("/Chongdingxiang_test")
public class Chongdingxiang_test extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public Chongdingxiang_test() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());

//String name=new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
String name=request.getParameter("name");
System.out.println(name+"_11111111");

//重定向
response.sendRedirect("test.html");

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

chongdingxiang_test2.java

package servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class Chongdingxiang_test2
*/
@WebServlet("/Chongdingxiang_test2")
public class Chongdingxiang_test2 extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public Chongdingxiang_test2() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub

response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
response.getWriter().append("Served at: ").append(request.getContextPath());
//String name=new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
String name=request.getParameter("name");
System.out.println(name+"_222222222");

//页面转发
request.getRequestDispatcher("test.html").forward(request, response);

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}