spring-boot调用外部接口-httpClient

（1）使用POST方式访问HTTP

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package com.example.httpclient.httpClientDemo;    import org.apache.http.HttpEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.protocol.HTTP; import org.apache.http.util.EntityUtils; import org.json.JSONException; import org.json.JSONObject;    import java.io.IOException; import java.util.ArrayList; import java.util.HashMap;       public class HttpPostDemo {        public static void main(String[] args) throws JSONException {         // 1. 创建HttpClient对象         CloseableHttpClient httpClient = HttpClientBuilder.create().build();         // 2. 创建HttpPost对象         HttpPost post = new HttpPost("https:12345/v1");         // 3. 设置POST请求传递参数 post.setEntity         JSONObject jsonObject = new JSONObject();         jsonObject.put("a", "aaa");         jsonObject.put("token", "222");         HashMap<String, Object> data = new HashMap<>();         data.put("ccc", "ccc");         data.put("version", "1.0");         ArrayList<String> ids = new ArrayList<>();         ids.add("6666");         data.put("ids", ids);         jsonObject.put("data", data);            post.setEntity(new StringEntity(jsonObject.toString(), HTTP.UTF_8));  // 这里这只字符格式，可以防止中文乱码            // 4. 执行请求并处理响应         try {             CloseableHttpResponse response = httpClient.execute(post);             HttpEntity entity = response.getEntity();             if (entity != null) {                 System.out.println("响应内容：");                 System.out.println(EntityUtils.toString(entity));             }             response.close();         } catch (IOException e) {             e.printStackTrace();         } finally {             // 5. 释放资源             try {                 httpClient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     }    }

　　

（2）使用Get方式访问HTTP

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package com.example.httpclient.httpClientDemo;    import org.apache.http.HttpEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.util.EntityUtils;    import java.io.IOException;    public class HttpGetDemo {     public static void main(String[] args) {         // 1. 创建HttpClient对象         CloseableHttpClient httpClient = HttpClientBuilder.create().build();         // 2. 创建HttpGet对象         HttpGet httpGet = new HttpGet("https://www.baidu.com/cache/fpid/chromelib_1_1.js?_=1636686387459");         CloseableHttpResponse response = null;         try {             // 3. 执行GET请求             response = httpClient.execute(httpGet);             System.out.println(response.getStatusLine());             // 4. 获取响应实体             HttpEntity entity = response.getEntity();             // 5. 处理响应实体             if (entity != null) {                 System.out.println("长度：" + entity.getContentLength());                 System.out.println("内容：" + EntityUtils.toString(entity));             }         } catch (IOException e) {             e.printStackTrace();         } finally {             // 6. 释放资源             try {                 response.close();                 httpClient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     } }