Java实现HttpClient发送GET、POST请求（https、http）
1、引入相关依赖包
jar包下载：httpcore4.5.5.jar fastjson-1.2.47.jar
maven：
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.5</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
2、主要类HttpClientService
1 package com.sinotn.service;
2
3 import com.alibaba.fastjson.JSONObject;
4 import org.apache.http.HttpEntity;
5 import org.apache.http.NameValuePair;
6 import org.apache.http.client.entity.UrlEncodedFormEntity;
7 import org.apache.http.client.methods.CloseableHttpResponse;
8 import org.apache.http.client.methods.HttpGet;
9 import org.apache.http.client.methods.HttpPost;
10 import org.apache.http.client.utils.URIBuilder;
11 import org.apache.http.entity.StringEntity;
12 import org.apache.http.impl.client.CloseableHttpClient;
13 import org.apache.http.impl.client.HttpClients;
14 import org.apache.http.message.BasicHeader;
15 import org.apache.http.message.BasicNameValuePair;
16 import org.apache.http.util.EntityUtils;
17 import org.slf4j.Logger;
18 import org.slf4j.LoggerFactory;
19 import java.util.ArrayList;
20 import java.util.List;
21
22 /**
23 * HttpClient发送GET、POST请求
24 * @Author libin
25 * @CreateDate 2018.5.28 16:56
26 */
27 public class HttpClientService {
28
29 private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientService.class);
30 /**
31 * 返回成功状态码
32 */
33 private static final int SUCCESS_CODE = 200;
34
35 /**
36 * 发送GET请求
37 * @param url 请求url
38 * @param nameValuePairList 请求参数
39 * @return JSON或者字符串
40 * @throws Exception
41 */
42 public static Object sendGet(String url, List<NameValuePair> nameValuePairList) throws Exception{
43 JSONObject jsonObject = null;
44 CloseableHttpClient client = null;
45 CloseableHttpResponse response = null;
46 try{
47 /**
48 * 创建HttpClient对象
49 */
50 client = HttpClients.createDefault();
51 /**
52 * 创建URIBuilder
53 */
54 URIBuilder uriBuilder = new URIBuilder(url);
55 /**
56 * 设置参数
57 */
58 uriBuilder.addParameters(nameValuePairList);
59 /**
60 * 创建HttpGet
61 */
62 HttpGet httpGet = new HttpGet(uriBuilder.build());
63 /**
64 * 设置请求头部编码
65 */
66 httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
67 /**
68 * 设置返回编码
69 */
70 httpGet.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
71 /**
72 * 请求服务
73 */
74 response = client.execute(httpGet);
75 /**
76 * 获取响应吗
77 */
78 int statusCode = response.getStatusLine().getStatusCode();
79
80 if (SUCCESS_CODE == statusCode){
81 /**
82 * 获取返回对象
83 */
84 HttpEntity entity = response.getEntity();
85 /**
86 * 通过EntityUitls获取返回内容
87 */
88 String result = EntityUtils.toString(entity,"UTF-8");
89 /**
90 * 转换成json,根据合法性返回json或者字符串
91 */
92 try{
93 jsonObject = JSONObject.parseObject(result);
94 return jsonObject;
95 }catch (Exception e){
96 return result;
97 }
98 }else{
99 LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");
100 }
101 }catch (Exception e){
102 LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);
103 } finally {
104 response.close();
105 client.close();
106 }
107 return null;
108 }
109
110 /**
111 * 发送POST请求
112 * @param url
113 * @param nameValuePairList
114 * @return JSON或者字符串
115 * @throws Exception
116 */
117 public static Object sendPost(String url, List<NameValuePair> nameValuePairList) throws Exception{
118 JSONObject jsonObject = null;
119 CloseableHttpClient client = null;
120 CloseableHttpResponse response = null;
121 try{
122 /**
123 * 创建一个httpclient对象
124 */
125 client = HttpClients.createDefault();
126 /**
127 * 创建一个post对象
128 */
129 HttpPost post = new HttpPost(url);
130 /**
131 * 包装成一个Entity对象
132 */
133 StringEntity entity = new UrlEncodedFormEntity(nameValuePairList, "UTF-8");
134 /**
135 * 设置请求的内容
136 */
137 post.setEntity(entity);
138 /**
139 * 设置请求的报文头部的编码
140 */
141 post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
142 /**
143 * 设置请求的报文头部的编码
144 */
145 post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
146 /**
147 * 执行post请求
148 */
149 response = client.execute(post);
150 /**
151 * 获取响应码
152 */
153 int statusCode = response.getStatusLine().getStatusCode();
154 if (SUCCESS_CODE == statusCode){
155 /**
156 * 通过EntityUitls获取返回内容
157 */
158 String result = EntityUtils.toString(response.getEntity(),"UTF-8");
159 /**
160 * 转换成json,根据合法性返回json或者字符串
161 */
162 try{
163 jsonObject = JSONObject.parseObject(result);
164 return jsonObject;
165 }catch (Exception e){
166 return result;
167 }
168 }else{
169 LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");
170 }
171 }catch (Exception e){
172 LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);
173 }finally {
174 response.close();
175 client.close();
176 }
177 return null;
178 }
179
180 /**
181 * 组织请求参数{参数名和参数值下标保持一致}
182 * @param params 参数名数组
183 * @param values 参数值数组
184 * @return 参数对象
185 */
186 public static List<NameValuePair> getParams(Object[] params, Object[] values){
187 /**
188 * 校验参数合法性
189 */
190 boolean flag = params.length>0 && values.length>0 && params.length == values.length;
191 if (flag){
192 List<NameValuePair> nameValuePairList = new ArrayList<>();
193 for(int i =0; i<params.length; i++){
194 nameValuePairList.add(new BasicNameValuePair(params[i].toString(),values[i].toString()));
195 }
196 return nameValuePairList;
197 }else{
198 LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 197, "请求参数为空且参数长度不一致");
199 }
200 return null;
201 }
202 }
3、调用方法
1 package com.sinotn.service.impl; 2 3 import com.sinotn.service.HttpClientService; 4 import org.apache.http.NameValuePair; 5 6 import java.util.List; 7 8 /** 9 * 发送post/get 测试类 10 */ 11 public class Test { 12 13 public static void main(String[] args) throws Exception{ 14 String url = "要请求的url地址"; 15 /** 16 * 参数值 17 */ 18 Object [] params = new Object[]{"param1","param2"}; 19 /** 20 * 参数名 21 */ 22 Object [] values = new Object[]{"value1","value2"}; 23 /** 24 * 获取参数对象 25 */ 26 List<NameValuePair> paramsList = HttpClientService.getParams(params, values); 27 /** 28 * 发送get 29 */ 30 Object result = HttpClientService.sendGet(url, paramsList); 31 /** 32 * 发送post 33 */ 34 Object result2 = HttpClientService.sendPost(url, paramsList); 35 36 System.out.println("GET返回信息：" + result); 37 System.out.println("POST返回信息：" + result2); 38 } 39 }
4、对于发送https
为了避免需要证书，所以用一个类继承DefaultHttpClient类，忽略校验过程。
写一个SSLClient类，继承至HttpClient
1 import java.security.cert.CertificateException;
2 import java.security.cert.X509Certificate;
3 import javax.net.ssl.SSLContext;
4 import javax.net.ssl.TrustManager;
5 import javax.net.ssl.X509TrustManager;
6 import org.apache.http.conn.ClientConnectionManager;
7 import org.apache.http.conn.scheme.Scheme;
8 import org.apache.http.conn.scheme.SchemeRegistry;
9 import org.apache.http.conn.ssl.SSLSocketFactory;
10 import org.apache.http.impl.client.DefaultHttpClient;
11 //用于进行Https请求的HttpClient
12 public class SSLClient extends DefaultHttpClient{
13 public SSLClient() throws Exception{
14 super();
15 SSLContext ctx = SSLContext.getInstance("TLS");
16 X509TrustManager tm = new X509TrustManager() {
17 @Override
18 public void checkClientTrusted(X509Certificate[] chain,
19 String authType) throws CertificateException {
20 }
21 @Override
22 public void checkServerTrusted(X509Certificate[] chain,
23 String authType) throws CertificateException {
24 }
25 @Override
26 public X509Certificate[] getAcceptedIssuers() {
27 return null;
28 }
29 };
30 ctx.init(null, new TrustManager[]{tm}, null);
31 SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
32 ClientConnectionManager ccm = this.getConnectionManager();
33 SchemeRegistry sr = ccm.getSchemeRegistry();
34 sr.register(new Scheme("https", 443, ssf));
35 }
36 }
5、对于https调用
