Request-获取请求头数据
方法:
(*)String getHeader(String name):通过请求头的名称获取请求头的值
Enumeration<String> getHeaderNames():获取所有的请求头名称
package com.example.request; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Enumeration; @WebServlet("/requestDemo2") public class RequestDemo2 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //演示获取请求头数据 //1.获取所有请求头名称 Enumeration<String> headerNames = request.getHeaderNames(); //2.遍历 while(headerNames.hasMoreElements()){ String name = headerNames.nextElement(); //根据名称获取请求头的值 String value = request.getHeader(name); System.out.println(name+"---"+value); } } }
package com.example.request; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Enumeration; @WebServlet("/requestDemo3") public class RequestDemo3 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //演示获取请求头数据:user-agent String agent = request.getHeader("user-agent"); //判断agent的浏览器版本 if(agent.contains("Chrome")){ //谷歌 System.out.println("谷歌来了..."); }else if(agent.contains("Firefox")){ //火狐 System.out.println("火狐来了..."); } } }
package com.example.request; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/requestDemo4") public class RequestDemo4 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //演示获取请求头数据:referer String referer = request.getHeader("referer"); System.out.println(referer);//http://localhost/day14/login.html //防盗链 if(referer != null ){ if(referer.contains("/day14")){ //正常访问 // System.out.println("播放电影...."); response.setContentType("text/html;charset=utf-8"); response.getWriter().write("播放电影...."); }else{ //盗链 //System.out.println("想看电影吗?来优酷吧..."); response.setContentType("text/html;charset=utf-8"); response.getWriter().write("想看电影吗?来优酷吧..."); } } } }
Request-获取请求体数据
请求体:只有POST请求方式,才有请求体,在请求体中封装了POST请求的请求参数
步骤:
获取流对象
BufferedReader getReader():获取字符输入流,只能操作字符数据
ServletInputStream getInputStream():获取字节输入流,可以操作所有类型数据
在文件上传知识点后讲解
再从流对象中拿数据
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>注册页面</title> </head> <body> <form action="/day14/requestDemo5" method="post"> <input type="text" placeholder="请输入用户名" name="username"><br> <input type="text" placeholder="请输入密码" name="password"><br> <input type="submit" value="注册"> </form> </body> </html>
package com.example.request; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.BufferedReader; import java.io.IOException; @WebServlet("/requestDemo5") public class RequestDemo5 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取请求消息体--请求参数 //1.获取字符流 BufferedReader br = request.getReader(); //2.读取数据 String line = null; while((line = br.readLine()) != null){ System.out.println(line); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } }
原文地址:http://www.cnblogs.com/yuzong/p/16927983.html
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