1 package cn.itcast.request; 2 3 import java.io.IOException; 4 import java.io.InputStream; 5 import java.io.PrintWriter; 6 import java.lang.reflect.InvocationTargetException; 7 import java.util.Enumeration; 8 import java.util.Map; 9 10 import javax.servlet.ServletException; 11 import javax.servlet.http.HttpServlet; 12 import javax.servlet.http.HttpServletRequest; 13 import javax.servlet.http.HttpServletResponse; 14 15 import org.apache.commons.beanutils.BeanUtils; 16 17 import cn.itcast.User; 18 19 //获取请求头和请求数据 20 //获取请求数据（获取请求数据时一般来说都要先检查再使用） 21 public class RequestDemo extends HttpServlet { 22 23 public void doGet(HttpServletRequest request, HttpServletResponse response) 24 throws ServletException, IOException { 25 26 System.out.println("--------------获取方法1----------------"); 27 String value = request.getParameter("username"); 28 if (value != null && !value.trim().equals("")) { 29 System.out.println(value); 30 } 31 32 System.out.println("--------------获取方法2----------------"); 33 Enumeration e = request.getParameterNames(); 34 while (e.hasMoreElements()) { 35 String name = (String) e.nextElement(); 36 value = request.getParameter(name); 37 System.out.println(name + "=" + value); 38 } 39 40 System.out.println("--------------获取方法3----------------"); 41 String[] values = request.getParameterValues("username"); 42 for (int i = 0; values != null && i < values.length; i++) { 43 System.out.println(values); 44 } 45 46 System.out.println("--------------获取方法4----------------"); 47 Map map = request.getParameterMap(); 48 User user = new User(); 49 50 try { 51 BeanUtils.populate(user, map); 52 } catch (Exception e1) { 53 e1.printStackTrace(); 54 } 55 System.out.println(map); 56 57 } 58 59 // 获取头相关方法 60 private void test1(HttpServletRequest request) throws IOException { 61 String headValue = request.getHeader("Accept-Encoding"); 62 System.out.println(headValue); 63 System.out.println("-------------------------------"); 64 65 Enumeration e = request.getHeaders("Accept-Encoding"); 66 while (e.hasMoreElements()) { 67 String value = (String) e.nextElement(); 68 System.out.println(value); 69 } 70 71 System.out.println("-------------------------------"); 72 e = request.getHeaderNames(); 73 while (e.hasMoreElements()) { 74 String name = (String) e.nextElement(); 75 String value = request.getHeader(name); 76 System.out.println(name + "=" + value); 77 78 } 79 80 System.out.println("--------------获取方法5----------------"); 81 82 InputStream in = request.getInputStream(); 83 int len = 0; 84 byte buffer[] = new byte[1024]; 85 while ((len = in.read(buffer)) > 0) { 86 System.out.println(len); 87 System.out.println(new String(buffer, 0, len)); 88 } 89 } 90 91 public void doPost(HttpServletRequest request, HttpServletResponse response) 92 throws ServletException, IOException { 93 94 } 95 96 }
1 package cn.itcast; 2 3 public class User { 4 private String username[]; 5 private String password; 6 7 public String[] getUsername() { 8 return username; 9 } 10 11 public void setUsername(String[] username) { 12 this.username = username; 13 } 14 15 public String getPassword() { 16 return password; 17 } 18 19 public void setPassword(String password) { 20 this.password = password; 21 } 22 23 }
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2 <html> 3 <head> 4 <title>test.html</title> 5 6 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 7 <meta http-equiv="description" content="this is my page"> 8 <meta http-equiv="content-type" content="text/html; charset=UTF-8"> 9 10 <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> 11 12 </head> 13 14 <body> 15 <a href="/ServletDemo/servlet/RequestDemo?username=xxxx">点击看看</a> 16 17 <form action="/ServletDemo/servlet/RequestDemo" method="post"> 18 用户名1： 19 <input type="text" name="username" /> 20 用户名2： 21 <input type="text" name="username" /> 22 密码：<input type="password" name="password"/> 23 <input type="submit" value="提交" /> 24 25 </form> 26 </body> 27 </html>
request获取请求头和请求数据,布布扣,bubuko.com
原文：http://www.cnblogs.com/aineko/p/3830380.html
