Java调用命令行

使用Java的Runtime类

-exec以一个独立进程执行命令cmd,并返回Process句柄

-当独立进程启动后，需要处理该进程的输出流/错误流：1）调用Process.getInputStream可以获取进程的输出流；2）调用Process.getErrorStream可以获取进程的错误输出流

-调用Process.waitFor等待目标进程的终止（当前进程阻塞）

 

exec

command-命令字符串；cmdarray-命令以及参数组成的数组；envp-环境变量; dir-指定目录下执行

 

示例：

package com.welldone.my.learn.cmd;

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

public class JavaExec0 {
	public static void main(String[] args) {
		Process p;
		String cmds = "ipconfig /all";
		
		try {
			//执行命令
			p = Runtime.getRuntime().exec(cmds);
			//获取输出流，并包装到BufferedReader中
			BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
			String line = null;
			while((line = br.readLine()) != null) {
				System.out.println(line);
			}
			int exitValue = p.waitFor();
			System.out.println("进程返回值：" + exitValue);
		} catch (IOException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
	}
}

 

package com.welldone.my.learn.cmd;

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

public class JavaExec2 {
	public static void main(String[] args) {
		Runtime rt = Runtime.getRuntime();
		try {
			Process process = rt.exec("javac");
			BufferedReader br = new BufferedReader(new InputStreamReader(process.getErrorStream()));
			String line = null;
			while((line  = br.readLine()) != null) {
				System.out.println(line);
			}
			int exitValue = process.waitFor();
			System.out.println("进程返回值：" + exitValue);
		} catch (IOException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		
		
	}
}

 

来源：CSDN

作者：weixin_40927846

链接：https://blog.csdn.net/weixin_40927846/article/details/103796092