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.do2 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
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