java调用Linux shell命令

思路

利用Java的Runtime获取到JVM运行环境，当项目部署到Linux上时，即可通过exec方法执行sh文件了。

具体实现

package com.xiaowuqin;

import java.io.IOException;
import java.io.InputStream;

public class ProcessDemo {
    private Process process;
    public ProcessDemo(String command) throws IOException, InterruptedException {
        process=Runtime.getRuntime().exec(command);
        int i = process.waitFor();
    }
    public InputStream getResult(){
        return this.process.getInputStream();
    }
}

package com.xiaowuqin;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException, InterruptedException {
        String shp="/bin/bash /opt/a.sh";
        String command=shp;
        ProcessDemo processDemo = new ProcessDemo(command);
        InputStream result = processDemo.getResult();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(result));
        System.out.println(bufferedReader.readLine());
    }
}

踩坑点，在Linux上报错：

Error: Could not find or load main class

原因及解决：
当前目录是.class文件所在目录，要运行.class字节码文件，需要将当前目录加入系统变量CLASSPATH，系统才能找到当前目录下的Java类。