JAVA调用Linux/Unix CMD

冷不防 2022-08-12 19:59 153阅读 0赞

本文主要想说明：在开发过程中，要善于利用JAVA面向对象编程的优势，与Linux/Unix Shell命令的优势，并将二者相结合。

**JAVA代码：**

package shuai.study.cmd;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Iterator;
    import java.util.List;
    
    import org.apache.commons.io.IOUtils;
    
    public class TestCmd {
    
    	public static InputStream executeCmd(String cmd) {
    		String[] cmdArray = new String[] { "bash", "-c", cmd };
    
    		Runtime runtime = Runtime.getRuntime();
    		Process process = null;
    
    		try {
    			process = runtime.exec(cmdArray);
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    
    		return process.getInputStream();
    	}
    
    	public static void readInputStream(InputStream inputStream) {
    		try {
    			List<String> list = IOUtils.readLines(inputStream);
    
    			Iterator<String> iterator = list.iterator();
    			while (iterator.hasNext()) {
    				String line = iterator.next();
    
    				System.out.println(line);
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		} finally {
    			IOUtils.closeQuietly(inputStream);
    		}
    	}
    
    	public static void main(String[] args) {
    		String cmd = "awk -F':' '{print $NF}' /etc/passwd";
    
    		if (args != null && args.length > 0) {
    			cmd = args[0];
    		}
    
    		InputStream inputStream = TestCmd.executeCmd(cmd);
    		TestCmd.readInputStream(inputStream);
    	}
    }

**运行脚本run.sh:**

#!/bin/bash
    
    java -Djava.ext.dirs=../lib -Xverify:none -Xms1024m -Xmx2048m -Xmn512m -XX:PermSize=96m -XX:MaxPermSize=96m -XX:+DisableExplicitGC -Xnoclassgc -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=85 shuai.study.cmd.TestCmd "$*"

**安装包java-cmd.zip：** [java-cmd.zip][]

[java-cmd.zip]: http://download.csdn.net/detail/three_man/7995023