Question

public class Http_Read_PLC_Value {
public static void main(String args[]){
    String nextLine;
    URL url = null;
    URLConnection urlConn = nullone
    InputStreamReader  inStream = null;
    BufferedReader buff = null;
    try{
        url = new URL("http://api.enda.com/devive/mac_address/password/read/MW/0");
        urlConn = url.openConnection();
        inStream = new InputStreamReader( urlConn.getInputStream());
        buff= new BufferedReader(inStream);
        while (true){
            nextLine =buff.readLine();  
            if (nextLine !=null){
               System.out.println(nextLine);      
            }
            else break;
        }
    }
    catch(MalformedURLException e) { System.out.println("Check URL :" + e.toString() ); }
    catch(IOException  e1) { System.out.println("Can't read : "+ e1.toString() ); }
  }
}

控制台的输出：{"Result":[1572],"Status":"OK"}

我的问题：

bracked的值在0和0之间变化。 28800和布尔值。该值有时是一个字符（如[2]），有时是五个字符（如[27924]），有时[true]或[false]。当我运行该prg时，我需要一个字符串值的bracked。我怎么能得到？

Answer 1

 while (true){
        nextLine =buff.readLine();  
        if (nextLine !=null){
           System.out.println(nextLine);      
        }
        else break;

        // I added that line and solved my problem
        System.out.println(nextLine.substring((Integer.valueOf(nextLine.indexOf('[')) + 1),(Integer.valueOf(nextLine.indexOf(']')))));

    }
}
catch(MalformedURLException e) { System.out.println("Check URL :" + e.toString() ); }

控制台的输出：{＆＃34;结果＆＃34;：[18627]，＆＃34;状态＆＃34;：＆＃34;确定＆＃34;} 18627

感谢您的关注

从网上读取PLC

我的问题：

1 个答案: