如何使用HttpClient包实现JAVA发起HTTP请求？

今天在搭建公司项目框架的时候，发现缺少了一个Java发送HTTP请求的工具类，在网上找了一通，经过自己的改造，已经能实现get请求和post请求的了，现在将代码贴在这里。给大家参考。

  1 package com.sunyard.util;
  2
  3 import com.sunyard.constans.Constants;
  4
  5 import org.apache.commons.httpclient.*;
  6 import org.apache.commons.httpclient.methods.GetMethod;
  7 import org.apache.commons.httpclient.methods.PostMethod;
  8 import org.apache.commons.httpclient.methods.RequestEntity;
  9 import org.apache.commons.httpclient.methods.StringRequestEntity;
 10 import org.apache.commons.httpclient.params.HttpConnectionManagerParams;
 11 import org.apache.commons.lang.StringUtils;
 12 import org.apache.logging.log4j.LogManager;
 13 import org.apache.logging.log4j.Logger;
 14
 15 import java.io.IOException;
 16 import java.net.URL;
 17
 18 public class HTTPUtils {
 19
 20     private final static Logger logger = LogManager.getLogger(Constants.LOGNAME);
 21
 22     private final static String OPERATER_NAME = "【HTTP操作】";
 23
 24     private final static int SUCCESS = 200;
 25
 26     private final static String UTF8 = "UTF-8";
 27
 28     private HttpClient client;
 29
 30     private static HTTPUtils instance = new HTTPUtils();
 31
 32     /**
 33      * 私有化构造器
 34      */
 35     private HTTPUtils() {
 36
 37         HttpConnectionManager httpConnectionManager = new MultiThreadedHttpConnectionManager();
 38         HttpConnectionManagerParams params = httpConnectionManager.getParams();
 39         params.setConnectionTimeout(5000);
 40         params.setSoTimeout(20000);
 41         params.setDefaultMaxConnectionsPerHost(1000);
 42         params.setMaxTotalConnections(1000);
 43         client = new HttpClient(httpConnectionManager);
 44         client.getParams().setContentCharset(UTF8);
 45         client.getParams().setHttpElementCharset(UTF8);
 46     }
 47
 48     /**
 49      * get请求
 50      */
 51     public static String get(URL url) {
 52         return instance.doGet(url);
 53     }
 54
 55     private String doGet(URL url) {
 56         long beginTime = System.currentTimeMillis();
 57         String respStr = StringUtils.EMPTY;
 58         try {
 59             logger.info(OPERATER_NAME + "开始get通信，目标host:" + url);
 60             HttpMethod method = new GetMethod(url.toString());
 61             // 中文转码
 62             method.getParams().setContentCharset(UTF8);
 63             try {
 64                 client.executeMethod(method);
 65             } catch (HttpException e) {
 66
 67                 logger.error(new StringBuffer("发送HTTP GET给\r\n").append(url)
 68                         .append("\r\nHTTP异常\r\n"), e);
 69             } catch (IOException e) {
 70
 71                 logger.error(new StringBuffer("发送HTTP GET给\r\n").append(url)
 72                         .append("\r\nIO异常\r\n"), e);
 73             }
 74             if (method.getStatusCode() == SUCCESS) {
 75                 respStr = method.getResponseBodyAsString();
 76             }
 77             // 释放连接
 78             method.releaseConnection();
 79
 80             logger.info(OPERATER_NAME + "通讯完成，返回码：" + method.getStatusCode());
 81             logger.info(OPERATER_NAME + "返回内容：" + method.getResponseBodyAsString());
 82             logger.info(OPERATER_NAME + "结束..返回结果:" + respStr);
 83         } catch (Exception e) {
 84             logger.info(OPERATER_NAME, e);
 85         }
 86         long endTime = System.currentTimeMillis();
 87         logger.info(OPERATER_NAME + "共计耗时:" + (endTime - beginTime) + "ms");
 88
 89         return respStr;
 90     }
 91
 92
 93     /**
 94      * POST请求
 95      */
 96     public static String post(URL url, String content) {
 97         return instance.doPost(url, content);
 98     }
 99
100     private String doPost(URL url, String content) {
101         long beginTime = System.currentTimeMillis();
102         String respStr = StringUtils.EMPTY;
103         try {
104             logger.info(OPERATER_NAME + "开始post通信，目标host:" + url.toString());
105             logger.info("通信内容:" + content);
106             PostMethod post = new PostMethod(url.toString());
107             RequestEntity requestEntity = new StringRequestEntity(content, "application/json;charse=UTF-8", UTF8);
108             post.setRequestEntity(requestEntity);
109             // 设置格式
110             post.getParams().setContentCharset(UTF8);
111
112             client.executeMethod(post);
113             if (post.getStatusCode() == SUCCESS) {
114                 respStr = post.getResponseBodyAsString();
115             }
116
117             logger.info(OPERATER_NAME + "通讯完成，返回码：" + post.getStatusCode());
118             logger.info(OPERATER_NAME + "返回内容：" + post.getResponseBodyAsString());
119             logger.info(OPERATER_NAME + "结束..返回结果:" + respStr);
120             post.releaseConnection();
121
122         } catch (Exception e) {
123             logger.error(OPERATER_NAME, e);
124         }
125         long endTime = System.currentTimeMillis();
126         logger.info(OPERATER_NAME + "共计耗时:" + (endTime - beginTime) + "ms");
127         return respStr;
128     }
129
130 }

 jar依赖如图

编写测试类测试：

1  public static void main(String[] args) throws Exception {
2         JSONObject json = new JSONObject();
3         json.put("action", "test");
4         URL url = new URL("http://localhost:8080/TPSServer/door.do");
5         String resp = post(url, json.toString());
6         System.out.println(resp);
7     }

控制台输出结果：

1 2017-07-26 11:17:09 GMT+08:00 INFO  com.sunyard.util.HTTPUtils 106 doPost - 【HTTP操作】开始post通信，目标host:http://localhost:8080/TPSServer/door.do
2 2017-07-26 11:17:09 GMT+08:00 INFO  com.sunyard.util.HTTPUtils 107 doPost - 通信内容:{"action":"test"}
3 2017-07-26 11:17:10 GMT+08:00 INFO  com.sunyard.util.HTTPUtils 119 doPost - 【HTTP操作】通讯完成，返回码：200
4 2017-07-26 11:17:10 GMT+08:00 INFO  com.sunyard.util.HTTPUtils 120 doPost - 【HTTP操作】返回内容：{"errorcode":"0","errormsg":"success"}
5 2017-07-26 11:17:10 GMT+08:00 INFO  com.sunyard.util.HTTPUtils 121 doPost - 【HTTP操作】结束..返回结果:{"errorcode":"0","errormsg":"success"}
6 2017-07-26 11:17:10 GMT+08:00 INFO  com.sunyard.util.HTTPUtils 128 doPost - 【HTTP操作】共计耗时:579ms
7 {"errorcode":"0","errormsg":"success"}

HttpClient工具包的使用，请大家参考。

from: https://www.cnblogs.com/yujiwei/p/7238613.html