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1.用java代码执行linux命令#

用java代码执行Linux命令，并得到对应的返回值

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

public  class CMDUtils {
    private String cmds;

    public CMDUtils(String cmds) {
        this.cmds = cmds;
    }

    public String getCmds() {
        return cmds;
    }

    public void setCmds(String cmds) {
        this.cmds = cmds;
    }

    public Object cmd(){
        System.out.println("执行的命令是："+this.cmds);
        String[] cmd = new String[]{"/bin/sh", "-c", this.cmds};
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(cmd);

            BufferedReader buffer = new BufferedReader(new InputStreamReader(process.getInputStream()));
            StringBuffer stringBuffer = new StringBuffer();
            String line;
            while ((line = buffer.readLine()) != null) {
                stringBuffer.append(line).append("\n");
            }
            String result = stringBuffer.toString();
            System.out.println("执行的结果是：=================================");
            System.out.println(result);
            return result;
        } catch (IOException e) {
            e.printStackTrace();
            return  null;
        }

    }
}

这样执行过命令后会返回对应的执行结果。测试代码如下：

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public class MyTest {
    public static void main(String args[]) {
        System.out.println("hello world");
        String cmds = "df -h";
        CMDUtils cmdUtils = new CMDUtils(cmds);
        String result = (String) cmdUtils.cmd();
        System.out.println("我拿到的结果是：============================");
        System.out.println(result);
    }
}

测试结果如下：

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[geneplus@OncoBox-19 quhaichuan]$ javac MyTest.java
[geneplus@OncoBox-19 quhaichuan]$ java MyTest
hello world
执行的命令是：df -h
执行的结果是：=================================
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  213G  144G   70G  68% /
devtmpfs                  63G     0   63G   0% /dev
tmpfs                     63G   76K   63G   1% /dev/shm
tmpfs                     63G  3.1G   60G   5% /run
tmpfs                     63G     0   63G   0% /sys/fs/cgroup
/dev/sda1                7.3T  2.3T  5.1T  31% /mnt/ONCOBOX
/dev/sdb1                2.0G  171M  1.9G   9% /boot
tmpfs                     13G   36K   13G   1% /run/user/1001

我拿到的结果是：============================
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  213G  144G   70G  68% /
devtmpfs                  63G     0   63G   0% /dev
tmpfs                     63G   76K   63G   1% /dev/shm
tmpfs                     63G  3.1G   60G   5% /run
tmpfs                     63G     0   63G   0% /sys/fs/cgroup
/dev/sda1                7.3T  2.3T  5.1T  31% /mnt/ONCOBOX
/dev/sdb1                2.0G  171M  1.9G   9% /boot
tmpfs                     13G   36K   13G   1% /run/user/1001

上面在linux环境下编译javac MyTest.java后，执行的结果可以看到如上。

参考博客