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
时间： 2024-12-19 11:23:56