接口的http请求，获取json数据格式的工具类HttpPost

Posted 2022-06-17 阿啄debugIT

接口的http请求，获取json数据格式的工具类

工具类HttpPost

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpPost

  public static String httpUrlConnectionPost(String startTime, String endTime, String scenicIds)
  
    String POST_URL = "http://111.197.19.111:8001/zxcvfg-ertw-service/v1/scenics/analysis";
    String result = null;
    try 
      URL url = new URL(POST_URL);

      HttpURLConnection connection = (HttpURLConnection)url.openConnection();

      connection.setDoOutput(true);

      connection.setDoInput(true);

      connection.setRequestMethod("POST");

      connection.setUseCaches(false);

      connection.setInstanceFollowRedirects(true);

      connection.setRequestProperty("Content-Type", "application/json;charset=utf-8");

      connection.connect();

      DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());

      String data = new StringBuilder().append(" \\"dayRange\\":  \\"end\\": \\"").append(endTime).append("\\", \\"start\\": \\"").append(startTime).append("\\" , ").append("\\"dimensions\\": [ ").append("\\"provinceSourceTop10\\" ], \\"scenicIds\\": [").append(scenicIds).append("]").toString();

      dataOutputStream.writeBytes(data);

      dataOutputStream.flush();
      dataOutputStream.close();

      BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));

      StringBuilder sb = new StringBuilder();
      String line;
      while ((line = bf.readLine()) != null)
      
        sb.append(line).append(System.getProperty("line.separator"));
      
      bf.close();
      connection.disconnect();

      result = sb.toString();
     catch (IOException e) 
      e.printStackTrace();
    
    return result;
  

DataOutputStream.writeBytes()特别解析

DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());
String data = new StringBuilder().append(" \\"dayRange\\":  \\"end\\": \\"").append(endTime).append("\\", \\"start\\": \\"").append(startTime).append("\\" , ").append("\\"dimensions\\": [ ").append("\\"provinceSourceTop10\\" ], \\"scenicIds\\": [").append(scenicIds).append("]").toString();
dataOutputStream.writeBytes(data);
dataOutputStream.flush();
dataOutputStream.close();

java.io.DataInputStream.writeBytes(String s) 方法写入一个字节到底层流为1个字节的值。成功执行此方法该计数器加1递增。
其中dataOutputStream.writeBytes(data)方法的说明：
参数：data -- 源作为字符串写入的字节流；返回值：此方法不返回任何值；异常：IOException -- 如果发生I/ O错误。