1 //获取请求头和请求数据
2 //请求数据（1.通过超链接 2.通过表单）
3 //获取请求数据的时候一般来说 都要先检查 再使用
4 public class RequestDemo2 extends HttpServlet {
5
6 //获取数据的相关方法
7 public void doGet(HttpServletRequest request, HttpServletResponse response)
8 throws ServletException, IOException {
9
10 System.out.println("-----------获取数据方式1-------------");
11
12 String value = request.getParameter("username");
13 if(value != null && !value.trim().equals("")) {
14 System.out.println(value);
15 }
16
17 System.out.println("-----------获取数据方式2----------- -");
18
19 Enumeration e = request.getParameterNames();
20 while(e.hasMoreElements()) {
21 String name = (String) e.nextElement();
22 value = request.getParameter(name);
23 System.out.println(name + "=" + value);
24 }
25
26 System.out.println("-----------获取数据方式3-------------");
27
28 String[] values = request.getParameterValues("username");
29
30 for(int i = 0;i<values.length && values[i] != null;i++) {
31 System.out.println(values[i]);
32 }
33
34 System.out.println("-----------获取数据方式4-------------");
35 /*使用Map （常用）*/
36 /*Map<String,String[]> map = request.getParameterMap();
37 User user = new User();
38 try {
39 BeanUtils.populate(user, map); //用map集合的数据填充bean
40 BeanUtils.copyProperties(user, formbean);
41 } catch(Exception e1) {
42 e1.printStackTrace();
43 }*/
44
45 System.out.println("-----------获取数据方式5-------------"); //用于文件上传
46
47 InputStream in = request.getInputStream();
48
49 int len = 0;
50 byte[] buffer = new byte[1024];
51 while((len = in.read()) > 0) {
52 System.out.print(new String(buffer,0,len));
53 }
54 }
55
56 //获取头的相关方法
57 private void test1(HttpServletRequest request) {
58 String HeadValue = request.getHeader("Accept-Encoding");
59 System.out.println(HeadValue);
60
61 System.out.println("-------------------------");
62
63 Enumeration e = request.getHeaders("Accept-Encoding");
64 while(e.hasMoreElements()) {
65 String value = (String) e.nextElement();
66 System.out.println(value);
67 }
68
69 System.out.println("-------------------------");
70
71 e = request.getHeaderNames();
72
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 public void doPost(HttpServletRequest request, HttpServletResponse response)
81 throws ServletException, IOException {
82 doGet(request, response);
83 }
84
85 }
1 //获取请求头和请求数据
2 //请求数据（1.通过超链接 2.通过表单）
3 //获取请求数据的时候一般来说 都要先检查 再使用
4 public class RequestDemo2 extends HttpServlet {
5
6 //获取数据的相关方法
7 public void doGet(HttpServletRequest request, HttpServletResponse response)
8 throws ServletException, IOException {
9
10 System.out.println("-----------获取数据方式1-------------");
11
12 String value = request.getParameter("username");
13 if(value != null && !value.trim().equals("")) {
14 System.out.println(value);
15 }
16
17 System.out.println("-----------获取数据方式2----------- -");
18
19 Enumeration e = request.getParameterNames();
20 while(e.hasMoreElements()) {
21 String name = (String) e.nextElement();
22 value = request.getParameter(name);
23 System.out.println(name + "=" + value);
24 }
25
26 System.out.println("-----------获取数据方式3-------------");
27
28 String[] values = request.getParameterValues("username");
29
30 for(int i = 0;i<values.length && values[i] != null;i++) {
31 System.out.println(values[i]);
32 }
33
34 System.out.println("-----------获取数据方式4-------------");
35 /*使用Map （常用）*/
36 /*Map<String,String[]> map = request.getParameterMap();
37 User user = new User();
38 try {
39 BeanUtils.populate(user, map); //用map集合的数据填充bean
40 BeanUtils.copyProperties(user, formbean);
41 } catch(Exception e1) {
42 e1.printStackTrace();
43 }*/
44
45 System.out.println("-----------获取数据方式5-------------"); //用于文件上传
46
47 InputStream in = request.getInputStream();
48
49 int len = 0;
50 byte[] buffer = new byte[1024];
51 while((len = in.read()) > 0) {
52 System.out.print(new String(buffer,0,len));
53 }
54 }
55
56 //获取头的相关方法
57 private void test1(HttpServletRequest request) {
58 String HeadValue = request.getHeader("Accept-Encoding");
59 System.out.println(HeadValue);
60
61 System.out.println("-------------------------");
62
63 Enumeration e = request.getHeaders("Accept-Encoding");
64 while(e.hasMoreElements()) {
65 String value = (String) e.nextElement();
66 System.out.println(value);
67 }
68
69 System.out.println("-------------------------");
70
71 e = request.getHeaderNames();
72
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 public void doPost(HttpServletRequest request, HttpServletResponse response)
81 throws ServletException, IOException {
82 doGet(request, response);
83 }
84
85 }
