1.利用进程的管道通信传输流

2.子进程没有控制台,正常测试的时候也是没办法看到子进程的输出的,需要传到主线程

3.测试主进程传参给子进程再传回来

4.父进程启动子进程只要执行runtime.exec(cmd)就行了,但在linu下面,需要传入数组命令,否则一些特定字符会被当做参数

5.比如"test.sh >> test.log",这种就不能exec直接执行,传入数组:{"/bin/sh","-c",cmd}

子进程:

import java.io.*;/** * Created by garfield on 2016/11/1. */public class TestCommand {    public static void main(String[] args) throws IOException, InterruptedException {        BufferedReader s = new BufferedReader(new InputStreamReader(System.in));        String line ;        StringBuffer all = new StringBuffer();        while((line = s.readLine()) != null){            all.append(line);        }        System.out.println(all);        s.close();    }}

父进程:

import java.io.*;/** * Created by garfield on 2016/11/9. */public class TestCommunication {    public static void main(String[] args) throws IOException, InterruptedException {        Runtime run = Runtime.getRuntime();        String java = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java";        String cp = "\"" + System.getProperty("java.class.path");        cp += File.pathSeparator + ClassLoader.getSystemResource("").getPath() + "\"";        String cmd = java + " -cp " + cp + " com.TestCommand";        Process p = run.exec(cmd);        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(p.getOutputStream()));        bw.write("999999");        bw.flush();        bw.close();        BufferedInputStream in = new BufferedInputStream(p.getInputStream());        BufferedReader br = new BufferedReader(new InputStreamReader(in));        String s;        while ((s = br.readLine()) != null)            System.out.println(s);    }}

父进程将99999传给子进程,又在控制台输出:

999999