Java发送HTTP的get，post请求(JSON)

柔光的暖阳◎ 2022-06-06 07:18 272阅读 0赞

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     }

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