1 package test;
2
3 import java.io.BufferedReader;
4 import java.io.DataOutputStream;
5 import java.io.IOException;
6 import java.io.InputStreamReader;
7 import java.net.HttpURLConnection;
8 import java.net.URL;
9 import java.net.URLEncoder;
10
11 public class HttpInvoker {
12
13 public static final String GET_URL = " http://localhost:8080/welcome1 ";
14
15 public static final String POST_URL = " http://www.court.gov.cn/zgcpwsw/List/ListContent ";
16
17 public static void readContentFromGet() throws IOException {
18 // 拼凑get请求的URL字串，使用URLEncoder.encode对特殊和不可见字符进行编码
19 String getURL = GET_URL + " ?username= "
20 + URLEncoder.encode(" fat man ", " utf-8 ");
21 URL getUrl = new URL(getURL);
22 // 根据拼凑的URL，打开连接，URL.openConnection函数会根据 URL的类型，
23 // 返回不同的URLConnection子类的对象，这里URL是一个http，因此实际返回的是HttpURLConnection
24 HttpURLConnection connection = (HttpURLConnection) getUrl
25 .openConnection();
26 // 进行连接，但是实际上get request要在下一句的 connection.getInputStream()函数中才会真正发到
27 // 服务器
28 connection.connect();
29 // 取得输入流，并使用Reader读取
30 BufferedReader reader = new BufferedReader(new InputStreamReader(
31 connection.getInputStream()));
32 System.out.println(" ============================= ");
33 System.out.println(" Contents of get request ");
34 System.out.println(" ============================= ");
35 String lines;
36 while ((lines = reader.readLine()) != null) {
37 System.out.println(lines);
38 }
39 reader.close();
40 // 断开连接
41 connection.disconnect();
42 System.out.println(" ============================= ");
43 System.out.println(" Contents of get request ends ");
44 System.out.println(" ============================= ");
45 }
46
47 public static void readContentFromPost() throws IOException {
48 // Post请求的url，与get不同的是不需要带参数
49 URL postUrl = new URL(POST_URL);
50 // 打开连接
51 HttpURLConnection connection = (HttpURLConnection) postUrl
52 .openConnection();
53 // Output to the connection. Default is
54 // false, set to true because post
55 // method must write something to the
56 // connection
57 // 设置是否向connection输出，因为这个是post请求，参数要放在
58 // http正文内，因此需要设为true
59 connection.setDoOutput(true);
60 // Read from the connection. Default is true.
61 connection.setDoInput(true);
62 // Set the post method. Default is GET
63 connection.setRequestMethod("POST");
64 // Post cannot use caches
65 // Post 请求不能使用缓存
66 connection.setUseCaches(false);
67 // This method takes effects to every instances of this class.
68 // URLConnection.setFollowRedirects是static 函数，作用于所有的URLConnection对象。
69 // connection.setFollowRedirects(true);
70
71 // This methods only takes effacts to this instance.
72 // URLConnection.setInstanceFollowRedirects 是成员函数，仅作用于当前函数
73 connection.setInstanceFollowRedirects(true);
74 // Set the content type to urlencoded,
75 // because we will write some URL-encoded content to the connection. Settings above must be set before connect!
76 // 配置本次连接的Content-type，配置为application/x- www-form-urlencoded的
77 // 意思是正文是urlencoded编码过的form参数，下面我们可以看到我们对正文内容使用URLEncoder.encode
78 // 进行编码
79
80 connection.setRequestProperty("Accept", "*/*");
81 connection.setRequestProperty("Accept-Encoding", "gzip, deflate");
82 connection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8,en;q=0.6");
83 connection.setRequestProperty("Connection", "keep-alive");
84 connection.setRequestProperty("Content-Length", "153");
85 connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
86 // connection.setRequestProperty("cookie", "Hm_lvt_692544717e4ca5489bff77b2e9b28e7b=1449645321; Hm_lpvt_692544717e4ca5489bff77b2e9b28e7b=1449645391; __jsluid=8c1e0374852916bf96a7f809c2aee3c8; _gscu_482111853=49645323pc25ob94; _gscbrs_482111853=1; ASP.NET_SessionId=m44tcmadhujdeijinvbiecnw; __jsl_clearance=1450332415.032|0|t2eMmMeGhHeoINln2hPaPf4D5HI%3D; _gscu_1241932522=50249161sf1y6f54; _gscs_1241932522=t50334524zs7d8g57|pv:1; _gscbrs_1241932522=1");
87 connection.setRequestProperty("cookie", "Hm_lvt_692544717e4ca5489bff77b2e9b28e7b=1449645321; Hm_lpvt_692544717e4ca5489bff77b2e9b28e7b=1449645391; __jsluid=8c1e0374852916bf96a7f809c2aee3c8; _gscu_482111853=49645323pc25ob94; _gscbrs_482111853=1; ASP.NET_SessionId=m44tcmadhujdeijinvbiecnw; __jsl_clearance=1450340955.958|0|YZsm9pGKRX79ASJMb7gwQkJv%2FS8%3D; _gsref_1241932522=http://www.court.gov.cn/zgcpwsw/List/List?sorttype=1&conditions=searchWord+1+AJLX++%E6%A1%88%E4%BB%B6%E7%B1%BB%E5%9E%8B:%E5%88%91%E4%BA%8B%E6%A1%88%E4%BB%B6; _gscu_1241932522=50249161sf1y6f54; _gscs_1241932522=t5034096609obrb54|pv:2; _gscbrs_1241932522=1");
88 connection.setRequestProperty("Host","www.court.gov.cn");
89 connection.setRequestProperty("Origin","http://www.court.gov.cn");
90 connection.setRequestProperty("Referer","http://www.court.gov.cn/zgcpwsw/List/List?sorttype=1&conditions=searchWord+1+AJLX++%E6%A1%88%E4%BB%B6%E7%B1%BB%E5%9E%8B:%E5%88%91%E4%BA%8B%E6%A1%88%E4%BB%B6");
91 connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36");
92 connection.setRequestProperty("X-Requested-With","XMLHttpRequest");
93
94
95 // 连接，从postUrl.openConnection()至此的配置必须要在 connect之前完成，
96 // 要注意的是connection.getOutputStream会隐含的进行 connect。
97 connection.connect();
98 DataOutputStream out = new DataOutputStream(connection
99 .getOutputStream());
100 // The URL-encoded contend
101 // 正文，正文内容其实跟get的URL中‘?‘后的参数字符串一致
102 // 表单参数包括：（1）Param:案件类型:刑事案件（2）Index:1
103 //（3）Page:5（4）Order:法院层级（5）Direction:asc
104 String content = "Param=%E6%A1%88%E4%BB%B6%E7%B1%BB%E5%9E%8B%3A%E5%88%91%E4%BA%8B%E6%A1%88%E4%BB%B6&Index=4&Page=5&Order=%E6%B3%95%E9%99%A2%E5%B1%82%E7%BA%A7&Direction=asc";
105 // String content = "Param="
106 // + URLEncoder.encode("案件类型:刑事案件 ", "utf-8");
107 // DataOutputStream.writeBytes将字符串中的16位的 unicode字符以8位的字符形式写道流里面
108 out.writeBytes(content);
109
110 out.flush();
111 out.close(); // flush and close
112 BufferedReader reader = new BufferedReader(new InputStreamReader(
113 connection.getInputStream()));
114 String line;
115 System.out.println(" ============================= ");
116 System.out.println(" Contents of post request ");
117 System.out.println(" ============================= ");
118 while ((line = reader.readLine()) != null) {
119 System.out.println(line);
120 }
121 System.out.println(" ============================= ");
122 System.out.println(" Contents of post request ends ");
123 System.out.println(" ============================= ");
124 reader.close();
125 connection.disconnect();
126 }
127
128
129 /** */
130 /**
131 * @param args
132 */
133 public static void main(String[] args) {
134 // TODO Auto-generated method stub
135 try {
136 // readContentFromGet();
137 readContentFromPost();
138 } catch (IOException e) {
139 // TODO Auto-generated catch block
140 e.printStackTrace();
141 }
142 }
143
144 }
第一次访问出现了521的错误状态码，原因是：
（https://www.zhihu.com/question/31015275）
时间： 2024-08-27 00:53:40