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;
}