JAVA_GET请求URL

 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;
     }

 }