一文告诉你如何使用java调用http接口

程序如下：

添加apache相关maven依赖：

1        <dependency>
2             <groupId>org.apache.commons</groupId>
3             <artifactId>commons-lang3</artifactId>
4             <version>3.7</version>
5         </dependency>    

POST请求如下：

  1 import com.alibaba.fastjson.JSONObject;
  2 import org.apache.http.HttpEntity;
  3 import org.apache.http.NameValuePair;
  4 import org.apache.http.client.entity.UrlEncodedFormEntity;
  5 import org.apache.http.client.methods.CloseableHttpResponse;
  6 import org.apache.http.client.methods.HttpGet;
  7 import org.apache.http.client.methods.HttpPost;
  8 import org.apache.http.client.utils.URIBuilder;
  9 import org.apache.http.entity.StringEntity;
 10 import org.apache.http.impl.client.CloseableHttpClient;
 11 import org.apache.http.impl.client.HttpClients;
 12 import org.apache.http.message.BasicHeader;
 13 import org.apache.http.message.BasicNameValuePair;
 14 import org.apache.http.util.EntityUtils;
 15 import org.slf4j.Logger;
 16 import org.slf4j.LoggerFactory;
 17 import java.util.ArrayList;
 18 import java.util.List;
 19
 20 /**
 21  * HttpClient发送POST请求
 22  */
 23 public class HttpClientService {
 24
 25
 26     /**
 27      * 发送POST请求
 28      * @param url
 29      * @param map集合
 30      * @return JSON
 31      * @throws Exception
 32      */
 33     public static Object sendPost(String url,  Map<String, String> map) throws Exception{
 34         JSONObject jsonObject = null;
 35         CloseableHttpClient client = null;
 36         CloseableHttpResponse response = null;
 37         try{
 38             /**
 39              * 创建一个httpclient对象
 40              */
 41             client = HttpClients.createDefault();
 42             /**
 43              * 创建一个post对象
 44              */
 45             HttpPost post = new HttpPost(url);
 46
 47             JSONObject jsonParam = new JSONObject();
 48             Set<String> set = map.keySet();
 49             for (String str : set) {//将Map转换成JSONObject
 50                 jsonParam.put(str, map.get(str));
 51             }
 52             JSONArray jsonArray = new JSONArray();
 53             jsonArray.add(jsonParam);//将JSONObject转换成JSONArray入参
 54
 55             /**
 56              * 设置上传byte[]数组文件流
 57             builder.addBinaryBody("data", byteOutStream.toByteArray(), ContentType.MULTIPART_FORM_DATA, "AudioFile.wav");
 58             HttpEntity entity = builder.build();
 59             */
 60
 61             /**
 62              * 设置上传单一对象
 63              */
 64             StringEntity entity = new StringEntity(jsonArray.toString(), "utf-8");
 65
 66             /**
 67              * 设置请求的内容
 68              */
 69             post.setEntity(entity);
 70             /**
 71              * 设置请求的报文头部的编码
 72              */
 73             post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
 74             /**
 75              * 设置请求的报文头部的编码
 76              */
 77             post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
 78             /**
 79              * 执行post请求
 80              */
 81             response = client.execute(post);
 82             /**
 83              * 获取响应码
 84              */
 85             int statusCode = response.getStatusLine().getStatusCode();
 86             if (200 == statusCode){
 87                 /**
 88                  * 通过EntityUitls获取返回内容
 89                  */
 90                 String result = EntityUtils.toString(response.getEntity(),"UTF-8");
 91                 /**
 92                  * 转换成json,根据合法性返回json或者字符串
 93                  */
 94                 try{
 95                     jsonObject = JSONObject.parseObject(result);
 96                     return jsonObject;
 97                 }catch (Exception e){
 98                     return result;
 99                 }
100             }else{
101                 LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");
102             }
103         }catch (Exception e){
104             LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);
105         }finally {
106             response.close();
107             client.close();
108         }
109         return null;
110     }
111
112 }

GET请求如下：

 1 import com.alibaba.fastjson.JSONObject;
 2 import org.apache.http.HttpEntity;
 3 import org.apache.http.NameValuePair;
 4 import org.apache.http.client.entity.UrlEncodedFormEntity;
 5 import org.apache.http.client.methods.CloseableHttpResponse;
 6 import org.apache.http.client.methods.HttpGet;
 7 import org.apache.http.client.methods.HttpPost;
 8 import org.apache.http.client.utils.URIBuilder;
 9 import org.apache.http.entity.StringEntity;
10 import org.apache.http.impl.client.CloseableHttpClient;
11 import org.apache.http.impl.client.HttpClients;
12 import org.apache.http.message.BasicHeader;
13 import org.apache.http.message.BasicNameValuePair;
14 import org.apache.http.util.EntityUtils;
15 import org.slf4j.Logger;
16 import org.slf4j.LoggerFactory;
17 import java.util.ArrayList;
18 import java.util.List;
19
20 /**
21  * HttpClient发送GET请求
22  */
23 public class HttpClientService {
24
25
26     /**
27      * 发送GET请求
28      * @param url请求url
29      * @param name请求参数
30      * @return JSON
31      * @throws Exception
32      */
33     public static Object sendGet(String url,String name) throws Exception{
34         JSONObject jsonObject = null;
35         CloseableHttpClient client = null;
36         CloseableHttpResponse response = null;
37         try{
38             /**
39              * 创建HttpClient对象
40              */
41             client = HttpClients.createDefault();
42             /**
43              * 创建URIBuilder
44              */
45             URIBuilder uriBuilder = new URIBuilder(url);
46
47             /**
48              * 设置参数
49              */
50             uriBuilder.addParameters(name);
51             /**
52              * 创建HttpGet
53              */
54             HttpGet httpGet = new HttpGet(uriBuilder.build());
55             /**
56              * 设置请求头部编码
57              */
58             httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
59             /**
60              * 请求服务
61              */
62             response = client.execute(httpGet);
63             /**
64              * 获取响应吗
65              */
66             int statusCode = response.getStatusLine().getStatusCode();
67
68             if (200 == statusCode){
69                 /**
70                  * 获取返回对象
71                  */
72                 HttpEntity entity = response.getEntity();
73                 /**
74                  * 通过EntityUitls获取返回内容
75                  */
76                 String result = EntityUtils.toString(entity,"UTF-8");
77                 /**
78                  * 转换成json,根据合法性返回json或者字符串
79                  */
80                 try{
81                     jsonObject = JSONObject.parseObject(result);
82                     return jsonObject;
83                 }catch (Exception e){
84                     return result;
85                 }
86             }else{
87                 LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");
88             }
89         }catch (Exception e){
90             LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);
91         } finally {
92             response.close();
93             client.close();
94         }
95         return null;
96     }
97
98 }

文章参考：

参考链接一、参考链接二、参考链接三、

总语：

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