Read PLC from web - plc

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() ); }
}
}
OUTPUT of Console : {"Result":[1572],"Status":"OK"}
My Question :
The value of bracked is changing between 0 & 28800 and boolean. That value sometimes one character (like[2]), sometimes five character (like[27924]), sometime [true] or [false].When I run that prg, I need a string value of bracked. How I can get ?

Answer 1

If you don't mind using middleware processing, I recommend the next open source middleware project.
http://www.lecpserver.com:3001/#/node_read_write
https://github.com/xeden3/LECPServer
LECPServer allows users to read and write data of multiple PLCs through Ajax, etc., and the method is very simple, and you can modify it to the mode you want according to your needs.
// send
{
"action": "plc_read_nodes",
"node": [
"NODES.MODBUS.C0000",
"NODES.MODBUS.H0000"
]
}
// response
{
"errcode": 0,
"errmsg": "",
"rtval": [
true,
true,
false,
false,
false
]
}

Answer 2

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() ); }
OUTPUT of Console : {"Result":[18627],"Status":"OK"}
18627
Thanks for your interest