java 执行系统命令并输出

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws Exception {
        String line;
        String cmd = "java -jar xxxx.1.0.jar parameter1 parameter2";
        Process proc = Runtime.getRuntime().exec(cmd);
        BufferedReader br = new BufferedReader(new InputStreamReader(proc.getInputStream()));
        if ((line = br.readLine()) != null) {
            System.out.println(line);
        }
        BufferedReader br2 = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
        if ((line = br2.readLine()) != null) {
            System.out.println(line);
        }
    }
}