Java调用Linux shell 完成多服务器的控制

import org.junit.jupiter.api.Test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Test001 {
    public static String exec(String command) throws InterruptedException {
        String returnString = "";
        Process pro = null;
        Runtime runTime = Runtime.getRuntime();
        if (runTime == null) {
            System.err.println("Create runtime false!");
        }
        try {
            pro = runTime.exec(command);
            BufferedReader input = new BufferedReader(new InputStreamReader(pro.getInputStream()));
            PrintWriter output = new PrintWriter(new OutputStreamWriter(pro.getOutputStream()));
            String line;
            while ((line = input.readLine()) != null) {