Java发送HTTP的get，post请求(JSON)

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转载来自:http://www.cnblogs.com/Mr-Chen-blog/articles/6951688.html

java http post请求传json数据格式，试了很多的方式，用了下面这个是可以

import net.sf.json.JSONObject;  2 import org.apache.commons.httpclient.*;  3 import org.apache.commons.httpclient.methods.GetMethod;  4 import org.apache.commons.httpclient.params.HttpMethodParams;  5 import org.apache.http.HttpEntity;  6 import org.apache.http.HttpResponse;  7 import org.apache.http.client.methods.HttpPost;  8 import org.apache.http.entity.StringEntity;  9 import org.apache.http.impl.client.DefaultHttpClient; 10 import org.apache.http.util.EntityUtils; 11 import java.io.IOException; 12  13 /** 14  * Created by liqun.chen on 2017/5/15. 15  */ 16 public class HttpUtil { 17     /** 18      * json 字符串 19      * @param url 20      * @param param 21      * @return 22      */ 23     public static String getSerchPersion(String url,String param){ 24       /* 1 生成 HttpClinet 对象并设置参数 */ 25         HttpClient httpClient = new HttpClient(); 26         // 设置 Http 连接超时为5秒 27         httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000); 28       /* 2 生成 GetMethod 对象并设置参数 */ 29         GetMethod getMethod = new GetMethod(url); 30         // 设置 get 请求超时为 5 秒 31         getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000); 32         // 设置请求重试处理，用的是默认的重试处理：请求三次 33         getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler()); 34         String response = ""; 35       /* 3 执行 HTTP GET 请求 */ 36         try { 37             int statusCode = httpClient.executeMethod(getMethod); 38          /* 4 判断访问的状态码 */ 39             if (statusCode != HttpStatus.SC_OK) { 40                 System.err.println("请求出错: "+ getMethod.getStatusLine()); 41             } 42          /* 5 处理 HTTP 响应内容 */ 43             // HTTP响应头部信息，这里简单打印 44             Header[] headers = getMethod.getResponseHeaders(); 45             for (Header h : headers) 46                 System.out.println(h.getName() + "------------ " + h.getValue()); 47             // 读取 HTTP 响应内容，这里简单打印网页内容 48             byte[] responseBody = getMethod.getResponseBody();// 读取为字节数组 49             response = new String(responseBody, param); 50             System.out.println("----------response:" + response); 51             // 读取为 InputStream，在网页内容数据量大时候推荐使用 52             // InputStream response = getMethod.getResponseBodyAsStream(); 53         } catch (HttpException e) { 54             // 发生致命的异常，可能是协议不对或者返回的内容有问题 55             System.out.println("请检查输入的URL!"); 56             e.printStackTrace(); 57         } catch (IOException e) { 58             // 发生网络异常 59             System.out.println("发生网络异常!"); 60             e.printStackTrace(); 61         } finally { 62          /* 6 .释放连接 */ 63             getMethod.releaseConnection(); 64         } 65         return response; 66     } 67     /** 68      * post请求 69      * @param url 70      * @param json 71      * @return 72      */ 73     public static JSONObject doPost(String url,JSONObject json){ 74         DefaultHttpClient client = new DefaultHttpClient(); 75         HttpPost post = new HttpPost(url); 76         JSONObject response = null; 77         try { 78             StringEntity s = new StringEntity(json.toString()); 79             s.setContentEncoding("UTF-8"); 80             s.setContentType("application/json");//发送json数据需要设置contentType 81             post.setEntity(s); 82             HttpResponse res = client.execute(post); 83             if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){ 84                 HttpEntity entity = res.getEntity(); 85                 String result = EntityUtils.toString(res.getEntity());// 返回json格式： 86                 response = JSONObject.fromObject(result); 87             } 88         } catch (Exception e) { 89             throw new RuntimeException(e); 90         } 91         return response; 92     }

 1 //调用 2 public static void main(String arg[]) throws Exception { 3         String url = "http://localhost:8080/"; 4         JSONObject params = new JSONObject(); 5         params.put("personName", "name"); 6         params.put("personCode", "230882xxxxxx2116"); 7         JSONObject param2 = new JSONObject(); 8         param2.put("pageNo", 1); 9         param2.put("pageSize", 20);10         params.put("page", param2);11         String param = "q="+params.toString();12         //get 请求13         String ret = getSerchPersion(url, param.toString());14         System.out.println(ret);15 //        JSONObject jsonResponse=JSONObject.fromObject(param);16 //        JSONObject json = (JSONObject)jsonResponse.get("page");17 //        System.out.println(json.get("pageSize"));18 19         //post 请求20         JSONObject jsonObject = doPost(url,params);21         System.out.println(jsonObject.toString());22     }

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