1 import java.io.IOException;
2
3 import net.sf.json.JSONObject;
4
5 import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
6 import org.apache.commons.httpclient.Header;
7 import org.apache.commons.httpclient.HttpClient;
8 import org.apache.commons.httpclient.HttpException;
9 import org.apache.commons.httpclient.HttpStatus;
10 import org.apache.commons.httpclient.methods.GetMethod;
11 import org.apache.commons.httpclient.params.HttpMethodParams;
12 import org.apache.http.HttpEntity;
13 import org.apache.http.HttpResponse;
14 import org.apache.http.client.methods.HttpPost;
15 import org.apache.http.entity.StringEntity;
16 import org.apache.http.impl.client.DefaultHttpClient;
17 import org.apache.http.util.EntityUtils;
18
19 public class TestGetRequest {
20
21 /**
22 * @param args
23 */
24 public static void main(String[] args) {
25
26 String url = "http://www.ecmwf.int/plots/get-map/"
;
27 String param = "{\"product\":{\"product\":{\"name\":\"public_plots\",\"package\":\"medium\"},\"values\":{\"time\":[\"2016032012\",48,\"2016032212\"],\"parameter\":\"Wind 850 and mslp\",\"area\":\"Asia\"}}}"
;
28 System.out.println(param);
29 JSONObject object =
JSONObject.fromObject(param);
30 JSONObject result =
doPost(url, object);
31 System.out.println(result);
32 JSONObject imgResult = (JSONObject) result.get("result"
);
33 System.out.println(imgResult.get("url"
));
34 }
35
36 public static String doGet(String url, String charset)
throws Exception {
37 /*
38 * 使用 GetMethod 来访问一个 URL 对应的网页,实现步骤: 1:生成一个 HttpClinet 对象并设置相应的参数。
39 * 2:生成一个 GetMethod 对象并设置响应的参数。 3:用 HttpClinet 生成的对象来执行 GetMethod 生成的Get
40 * 方法。 4:处理响应状态码。 5:若响应正常，处理 HTTP 响应内容。 6:释放连接。
41 */
42 /* 1 生成 HttpClinet 对象并设置参数 */
43 HttpClient httpClient =
new HttpClient();
44 // 设置 Http 连接超时为5秒
45 httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(
46 5000
);
47 /* 2 生成 GetMethod 对象并设置参数 */
48 GetMethod getMethod =
new GetMethod(url);
49 // 设置 get 请求超时为 5 秒
50 getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000
);
51 // 设置请求重试处理，用的是默认的重试处理：请求三次
52 getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
53 new DefaultHttpMethodRetryHandler());
54 String response = ""
;
55 /* 3 执行 HTTP GET 请求 */
56 try {
57 int statusCode =
httpClient.executeMethod(getMethod);
58 /* 4 判断访问的状态码 */
59 if (statusCode !=
HttpStatus.SC_OK) {
60 System.err.println("请求出错: " +
getMethod.getStatusLine());
61 }
62 /* 5 处理 HTTP 响应内容 */
63 // HTTP响应头部信息，这里简单打印
64 Header[] headers =
getMethod.getResponseHeaders();
65 for (Header h : headers)
66 System.out
67 .println(h.getName() + "------------ " +
h.getValue());
68 // 读取 HTTP 响应内容，这里简单打印网页内容
69 byte[] responseBody = getMethod.getResponseBody();
// 读取为字节数组
70 response =
new String(responseBody, charset);
71 System.out.println("----------response:" +
response);
72 // 读取为 InputStream，在网页内容数据量大时候推荐使用
73 // InputStream response = getMethod.getResponseBodyAsStream();
74 }
catch (HttpException e) {
75 // 发生致命的异常，可能是协议不对或者返回的内容有问题
76 System.out.println("请检查输入的URL!"
);
77 e.printStackTrace();
78 }
catch (IOException e) {
79 // 发生网络异常
80 System.out.println("发生网络异常!"
);
81 e.printStackTrace();
82 }
finally {
83 /* 6 .释放连接 */
84 getMethod.releaseConnection();
85 }
86 return response;
87 }
88
89 public static JSONObject doPost(String url, JSONObject json) {
90 DefaultHttpClient client =
new DefaultHttpClient();
91 HttpPost post =
new HttpPost(url);
92 JSONObject response =
null;
93 try {
94 StringEntity s =
new StringEntity(json.toString());
95 s.setContentEncoding("UTF-8"
);
96 s.setContentType("application/json");
// 发送json数据需要设置contentType
97 post.setEntity(s);
98 HttpResponse res =
client.execute(post);
99 if (res.getStatusLine().getStatusCode() ==
HttpStatus.SC_OK) {
100 HttpEntity entity =
res.getEntity();
101 String result = EntityUtils.toString(res.getEntity());
// 返回json格式：
102 response =
JSONObject.fromObject(result);
103 }
104 }
catch (Exception e) {
105 throw new RuntimeException(e);
106 }
107 return response;
108 }
109
110 }
转载于:https://www.cnblogs.com/bilaisheng/p/5464131.html
