java调用第三方接口（项目亲测）

大家好，又见面了，我是你们的朋友全栈君。

直接复制过去，就是一个很好的工具类了，直接可以使用

import com.alibaba.fastjson.JSONObject;
import com.aliyun.openservices.eas.predict.http.HttpConfig;
import com.aliyun.openservices.eas.predict.http.PredictClient;
import lombok.extern.slf4j.Slf4j;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;


/** * @author buH * #data 2020/12/4 10:07 * 接口工具类 */
@Slf4j
public class HttpUtil { 
   

    /** * post请求 * * @param URL 请求url * @param param 参数 * @param token 请求携带的token（如果需要） */
    public static String doPost(String URL, JSONObject param, String token) { 
   
        log.info("request address:"+URL);
        OutputStreamWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        HttpURLConnection conn = null;
        try { 
   
            java.net.URL url = new URL(URL);
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            if (token != null) { 
   
                conn.setRequestProperty("token", token);
            }
            //获取输出流
            if (param != null) { 
   
                out = new OutputStreamWriter(conn.getOutputStream());
                String jsonStr = param.toString();
                out.write(jsonStr);
                out.flush();
                out.close();
            }
            //取得输入流，并使用Reader读取
            if (200 == conn.getResponseCode()) { 
   
                in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
                String line;
                while ((line = in.readLine()) != null) { 
   
                    result.append(line);
                }
            } else { 
   
                System.out.println("ResponseCode is an error code:" + conn.getResponseCode());
            }
        } catch (Exception e) { 
   
            e.printStackTrace();
        } finally { 
   
            try { 
   
                if (out != null) { 
   
                    out.close();
                }
                if (in != null) { 
   
                    in.close();
                }
            } catch (IOException ioe) { 
   
                ioe.printStackTrace();
            }
        }
        return result.toString();
    }

    /** * 向指定URL发送GET方法的请求 * * @param baseUrl 发送请求的URL * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。 * @return result 所代表远程资源的响应结果 */
    public static String doGet(String baseUrl, String param) { 
   
        String result = "";
        BufferedReader in = null;
        try { 
   
            String urlNameString =baseUrl;
            if(param!=null){ 
   
                urlNameString = baseUrl + "?" + param;
            }
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
            connection.setRequestProperty("Charsert", "ISO-8859-1");
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) { 
   
                // 获取所有响应头字段
                Map<String, List<String>> map = connection.getHeaderFields();
                // 定义 BufferedReader输入流来读取URL的响应
                in = new BufferedReader(new InputStreamReader(
                        connection.getInputStream()));
                String line;
                while ((line = in.readLine()) != null) { 
   
                    result += line;
                }
            }else{ 
   
                return "Code="+connection.getResponseCode();
            }
        } catch (Exception e) { 
   
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally { 
   
            try { 
   
                if (in != null) { 
   
                    in.close();
                }
            } catch (Exception e2) { 
   
                e2.printStackTrace();
            }
        }
        return result;
    }