import java.io.IOException;

 import net.sf.json.JSONObject;

 import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;

 import org.apache.commons.httpclient.Header;

 import org.apache.commons.httpclient.HttpClient;

 import org.apache.commons.httpclient.HttpException;

 import org.apache.commons.httpclient.HttpStatus;

 import org.apache.commons.httpclient.methods.GetMethod;

 import org.apache.commons.httpclient.params.HttpMethodParams;

 import org.apache.http.HttpEntity;

 import org.apache.http.HttpResponse;

 import org.apache.http.client.methods.HttpPost;

 import org.apache.http.entity.StringEntity;

 import org.apache.http.impl.client.DefaultHttpClient;

 import org.apache.http.util.EntityUtils;

 public class TestGetRequest {

     /**

      * @param args

      */

     public static void main(String[] args) {

         String url = "http://www.ecmwf.int/plots/get-map/";

         String param = "{\"product\":{\"product\":{\"name\":\"public_plots\",\"package\":\"medium\"},\"values\":{\"time\":[\"2016032012\",48,\"2016032212\"],\"parameter\":\"Wind 850 and mslp\",\"area\":\"Asia\"}}}";

         System.out.println(param);

         JSONObject object = JSONObject.fromObject(param);

         JSONObject result = doPost(url, object);

         System.out.println(result);

         JSONObject imgResult = (JSONObject) result.get("result");

         System.out.println(imgResult.get("url"));

     }

     public static String doGet(String url, String charset) throws Exception {

         /*

          * 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。

          * 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

          * 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。

          */

         /* 1 生成 HttpClinet 对象并设置参数 */

         HttpClient httpClient = new HttpClient();

         // 设置 Http 连接超时为5秒

         httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(

                 5000);

         /* 2 生成 GetMethod 对象并设置参数 */

         GetMethod getMethod = new GetMethod(url);

         // 设置 get 请求超时为 5 秒

         getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);

         // 设置请求重试处理，用的是默认的重试处理：请求三次

         getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,

                 new DefaultHttpMethodRetryHandler());

         String response = "";

         /* 3 执行 HTTP GET 请求 */

         try {

             int statusCode = httpClient.executeMethod(getMethod);

             /* 4 判断访问的状态码 */

             if (statusCode != HttpStatus.SC_OK) {

                 System.err.println("请求出错: " + getMethod.getStatusLine());

             }

             /* 5 处理 HTTP 响应内容 */

             // HTTP响应头部信息，这里简单打印

             Header[] headers = getMethod.getResponseHeaders();

             for (Header h : headers)

                 System.out

                         .println(h.getName() + "------------ " + h.getValue());

             // 读取 HTTP 响应内容，这里简单打印网页内容

             byte[] responseBody = getMethod.getResponseBody();// 读取为字节数组

             response = new String(responseBody, charset);

             System.out.println("----------response:" + response);

             // 读取为 InputStream，在网页内容数据量大时候推荐使用

             // InputStream response = getMethod.getResponseBodyAsStream();

         } catch (HttpException e) {

             // 发生致命的异常，可能是协议不对或者返回的内容有问题

             System.out.println("请检查输入的URL!");

             e.printStackTrace();

         } catch (IOException e) {

             // 发生网络异常

             System.out.println("发生网络异常!");

             e.printStackTrace();

         } finally {

             /* 6 .释放连接 */

             getMethod.releaseConnection();

         }

         return response;

     }

     public static JSONObject doPost(String url, JSONObject json) {

         DefaultHttpClient client = new DefaultHttpClient();

         HttpPost post = new HttpPost(url);

         JSONObject response = null;

         try {

             StringEntity s = new StringEntity(json.toString());

             s.setContentEncoding("UTF-8");

             s.setContentType("application/json");// 发送json数据需要设置contentType

             post.setEntity(s);

             HttpResponse res = client.execute(post);

             if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

                 HttpEntity entity = res.getEntity();

                 String result = EntityUtils.toString(res.getEntity());// 返回json格式：

                 response = JSONObject.fromObject(result);

             }

         } catch (Exception e) {

             throw new RuntimeException(e);

         }

         return response;

     }

 }