Response对象介绍（服务器到客户端）

1.response的状态码和响应头设置

package com.test;

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 DemoServlet extends HttpServlet {


    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//        设置响应状态码
        response.setStatus(302);
        
//        页面刷新，重定向
        response.setHeader("Refresh", "5;url=http://www.baidu.com");
        
        response.sendRedirect("http://www.baidu.com");
    }


    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doGet(request, response);
    }
}

response.getWriter().write("jack 杰克");向客户端输出文本形式

2.重定向转发的区别

Content-Type: text/html; charset=utf-8   告诉浏览器以什么样的方式打开资源，和使用编码集

response.setContentType("text/html;charset=utf-8");

response.getWriter().write("<h1>哈哈哈<h1>");

效果：

如果设置普通文本形式：text/plain

response.setContentType("text/plain;charset=utf-8");
response.getWriter().write("<h1>哈哈哈<h1>");

效果：