Web服务器收到客户端的http请求,会针对每一次请求,分别创建一个用于代表请求的request对象、和代表响应的response对象。
request和response对象即然代表请求和响应,那我们要获取客户机提交过来的数据,只需要找request对象就行了。要向客户机输出数据,只需要找response对象就行了。

一、HttpServletResponse对象介绍

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" 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  HttpServletResponse对象代表服务器的响应。这个对象中封装了向客户端发送数据、发送响应头,发送响应状态码的方法。查看HttpServletResponse的API,可以看到这些相关的方法。

1.1、负责向客户端(浏览器)发送数据的相关方法

  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jU/Sc+AMCjgSyzgRoCAABAI8gyG6ghAAAANIIss4EaAgAAQCPIMhuoIQAAADSCLLOBGgIAAEAjJ1kGAAAAAOtyWS2DFqghAAAANMImpg3UEAAAABpBltlADQEAAKCR/wMnO+UjOK9lXAAAAABJRU5ErkJggg==" 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1.2、负责向客户端(浏览器)发送响应头的相关方法

  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" 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" alt="" />

1.3、负责向客户端(浏览器)发送响应状态码的相关方法

  aaarticlea/png;base64,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" alt="" />

1.4、响应状态码的常量

  HttpServletResponse定义了很多状态码的常量(具体可以查看Servlet的API),当需要向客户端发送响应状态码时,可以使用这些常量,避免了直接写数字,常见的状态码对应的常量:

  状态码404对应的常量

  aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAuMAAAAxCAIAAAD/djD+AAAGiklEQVR4nO3cMZbbNhCAYZ5Ld8g1eAofIYWKVKn2CH4pVKRMvU1qtS7y3HhvgBQraSkCM5gBQAmg/u+5kEhwMIQAckz6eQohfHx8vL29haGMmDMAAPCaQggfAAAAXbpUKm+jGTFnAADg9VWpPPnhjtOIOQMAAC8qFQAA0C8qFQAA0C8qFQAA0C8qFQAA0K/tKpXz8XA4nrdoHAKVCgAAr8FTqZyPs1JN6HtrpCJTqQAA8Ao8lcpp1p576HtrpCJTqQAA8AqUSuV8PEzTNE3T4XgO4TRPi29fO6f5FKK9n98X9cV1f7KYuWt8mqfD4SBHvkjmPM3vyz/Z7YnhuLb57Y9zfEgywiq4Mb6eZ7zl97//Sx67ytOeCQAAQ1ArldVLl/sN1xJiPqWbL77nH7csGp+Ph/l0t8n29icuKfTPklsFIB0bFxN//ftrWTRY4iufk8WK9NmeJwAAI1Lf/lwenBziiuFaToTTbKpUro0kd6Hny1Ob8kpF36hLVgBK9XDb8nmIMb6+0V51KZWK1BcAAAORK5Wv9ztflcohfimzfh90LWCW74bW74pW7hqf5s8Pi1dCd5EvlLc/+pb8iMzv377/mOb3P//5uWmlopQUxkolzlMPCwDAcPb2/6ms/olGt5WKnieVCgAAn/ZWqXyq+bcaPFMBAKAfVCqJY799/xHC3eOZLSoVZaO9UlnlqbQHAGBE+6lUjHf37J07WwFIpUZNpaLEL65UKFMAADuwt0pldduOd+lhVy2TRYP0RKQgvrQ3e5SUpzIIAACMaD+VCgAA2J8XrVRWzx6aP4HYOj4AAC9iJ5VKsjLgD0USAGB0O6lUAADALlGpAACAflGp4CVM09R5QABAEpUK9m+jqoJiBQAegEplYNO9Z6fTXpPzUiLEu/Qek+1dmZSdzurArX/ux0+nZ03gvS6cSi8+LK92+snzdd1WlJatbk9UKqNa/fZ7XVrbVSrx+rl9TR4irWdXJsWns+9KJTxvAu914VR65WGhUlnusgcp3muKH8a864+Yc1t6peKdGd2uzMrE9BW4uv0rB8btW2VotFEv/dQHxU+bntLvKJpUxniY3oadSqXWiDm31XZm9LZCbraoVJLPTpRKJfuspSZDIyoVY5zH9DsKKpWx9DbsVCq1Rsy5OeUlRfLtYHJ7sn2yjaULJVVjPsZULZ2GnioVZQSkvSF1yvoI2MdZ+hEL8pRC6RnG/TbJf+t+9eDJUEqc1a7kgdk4yVNTxseeT9vzlVKSko/HQe83u1E/KSWCnr/U0pWPPbgSx/g12a/UhaXfW0tl6IxxxJMNY971R8x5C/aZEa+WsvbZA/VkLHG87Y1dGztS+rUvQlc+lpQsp18wbvYrlJRndnwaxs9+fVi/UvD48FbzvGw9uq4D3p/Sdb4NzyvZr/R5i+uGJc7W83nreSJtV+JLfbniSKhU9sAyM27bb1wRlFnozc0Vf7USpPztvRsvzdlLob6xLB+p3+zXbBr2370mz+LrrBL/9tWVf32/BfNNmh7JOK3mf/Z3r8zHFbwgT+84KP1K8b2/YzJa5UwzjnNBL/F5KWMujYPx11HieM/L+7tQqeyEZeYpqz27MlfH2pd9qyuUdw1LRxmvpMvt+opyJWYf54KVb+m0+AplmQ9SAvXxLc3a9lsw37KLrqBfSz6uyenNR+E6XynPgvlfM85GUhfF173idW3sIvnZPoau0fP2lYzjXrlhzLv+iDm3VTkzKttnt3sPrLlSlyUQ/Eu3wXp7eKVSdmXc9I5eE59KxZVDV5VKstlAlUpNg+bzOTs+ro6aXweoVC5GzLmtR1Yqy79GVF7RXFeiyn6zLb13hUdWKkEYB6Vf7zhLcQryvElGq4nfSaXS6s4t3XGT/Vrmf8PrgDLfklznW7N9lY9l0lZeN7zXz2yE5vN56+u/N44yV4vj3DUIY971R8y5reme1EA5JLk32X65N9uvnq2Uj5T8agF4+70dKOWTHQSlvSuN5LjpX0NqHPTxz45z9pS9ecbRXANiGQdX/hv1a4kpNfbuWg2vno/edUiNTzaf5FGV56sckt0eH66frP187aeW7VpJQ/qqnEI2zzilVbbG9gXnK8VJJm+Mkz19KhW8BOPif2LAQcVXn2dlMjTGDVBQqQCoov8dEVmMHqCjUgEAAP2iUgEAAP2iUgEAAP2iUgEAAP2iUgEAAP26VCoAAAAd+nqmMpYRcwYAAF68/QEAAP2iUgEAAP36HzPoouA470ezAAAAAElFTkSuQmCC" alt="" />

  状态码200对应的常量

  aaarticlea/png;base64,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" alt="" />

  状态码500对应的常量

  aaarticlea/png;base64,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" alt="" width="950" />

二、HttpServletResponse常见应用——设置响应头控制浏览器的行为

2.1、设置http响应头控制浏览器禁止缓存当前文档内容

1 response.setDateHeader("expries", -1);
2 response.setHeader("Cache-Control", "no-cache");
3 response.setHeader("Pragma", "no-cache");

2.2、设置http响应头控制浏览器定时刷新网页(refresh)

1 response.setHeader("refresh", "5");//设置refresh响应头控制浏览器每隔5秒钟刷新一次

2.3、通过response实现请求重定向

  请求重定向指:一个web资源收到客户端请求后,通知客户端去访问另外一个web资源,这称之为请求重定向。

  应用场景:用户登陆,用户首先访问登录页面,登录成功后,就会跳转到某个页面,这个过程就是一个请求重定向的过程

  实现方式:response.sendRedirect(String location),即调用response对象的sendRedirect方法实现请求重定向
  sendRedirect内部的实现原理:使用response设置302状态码和设置location响应头实现重定向

例如:

 1 package gacl.response.study;
2 import java.io.IOException;
3 import javax.servlet.ServletException;
4 import javax.servlet.http.HttpServlet;
5 import javax.servlet.http.HttpServletRequest;
6 import javax.servlet.http.HttpServletResponse;
7
8 public class ResponseDemo04 extends HttpServlet {
9
10 public void doGet(HttpServletRequest request, HttpServletResponse response)
11 throws ServletException, IOException {
12 /**
13 * 1.调用sendRedirect方法实现请求重定向,
14 * sendRedirect方法内部调用了
15 * response.setHeader("Location", "/JavaWeb_HttpServletResponse_Study_20140615/index.jsp");
16 * response.setStatus(HttpServletResponse.SC_FOUND);//设置302状态码,等同于response.setStatus(302);
17 */
18 response.sendRedirect("/JavaWeb_HttpServletResponse_Study_20140615/index.jsp");
19
20 //2.使用response设置302状态码和设置location响应头实现重定向实现请求重定向
21 //response.setHeader("Location", "/JavaWeb_HttpServletResponse_Study_20140615/index.jsp");
22 //response.setStatus(HttpServletResponse.SC_FOUND);//设置302状态码,等同于response.setStatus(302);
23 }
24
25 public void doPost(HttpServletRequest request, HttpServletResponse response)
26 throws ServletException, IOException {
27 doGet(request, response);
28 }
29 }

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