Response的用法

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我是靠谱客的博主土豪曲奇，最近开发中收集的这篇文章主要介绍Response的用法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1. 设置响应行的状态码

setStatus(int value)

response.setStatus(302);

2.设置响应头

addHeader(String name,String value)
addIntHeader(String name,int value)
addDateHeader(String name,long value)

public class HeaderServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Date date = new Date();
response.addHeader("name", "xiaodingdang");
response.addHeader("name", "daxiong");
response.addIntHeader("age", 15);
response.addDateHeader("birthday", date.getTime());
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}

这里写图片描述

setHeader(String name,String value)
setIntHeader(String name ,int value)
setDateHeader(String name, long value)

public class HeaderServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Date date = new Date();
response.setHeader("name", "xiaodingdang");
response.setHeader("name", "daxiong");
response.setIntHeader("age", 15);
response.setDateHeader("birthday", date.getTime());
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}

这里写图片描述

注意了要注意setHeader和addHeader的不同一个是设置一个是添加设置只能是设置最后一个但是添加可以添加很多个

3.response实现重定向

方法一：

response.setStatus(302); //设置响应行的状态码为302 重定向
response.setHeader("Location", "/Servlet/servlet2"); //设置响应头的属性 跳转到Servlet2

方法二：

response.sendRedirect("/Servlet/servlet2"); //利用response中的sendRedirect属性完成重定向

4.response实现自动刷新跳转

public class RefreshServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setHeader("refresh", "5;url=http://www.baidu.com"); //设置头 参数 数值5为
//秒 中间用分号间隔 url为要跳转的网址
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}

使用JS来完成自动跳转

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
window.onload= function(){
var time = 3;
var second = document.getElementById("second");
timer = setInterval(function(){
second.innerHTML = time;
time--;
if(time==0){
location.href = "http://www.baidu.com";
clearInterval(timer);
}
},1000);
}
</script>
</head>
<body>
恭喜你,登录成功，<span id="second" style="color: red">3</span>秒后将跳转,若不跳转 请点击<a href="http://www.baidu.com">这里</a>
</body>
</html>

5.解决response中文乱码问题

//方法一：
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
response.setHeader("content-Type", "text/html;charset=utf-8");
response.getWriter().write("小叮当");
}
//方法二：
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//
response.setCharacterEncoding("UTF-8");
//
response.setHeader("content-Type", "text/html;charset=utf-8");
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("中国");
}
//通常使用第二种方法解决乱码问题

6.上传图片资源

public class TestServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ServletOutputStream outputStream = response.getOutputStream(); //获得字节输出流
String realPath = this.getServletContext().getRealPath("1.jpg"); //获得图片的真实路径
InputStream in = new FileInputStream(realPath); //获得服务器上的图片
//使用高效的方法写入客户端图片
int len = 0;
byte[] buffer = new byte[1024];
while((len=in.read(buffer))>0) {
outputStream.write(buffer, 0, len);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}

Response中应注意的细节