Java原生执行Shell 文件

项目中，需要通过java 调用shell

下面提供shell 的工具类

package com.myjz.util;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

/**
 * java 调用shell文件 
 */
public class ShellUtils {

	/**
	 * 执行下载文件的shell
	 * @param shellFileName shell 文件名称
	 * @param downFileName  下载文件的名称 --- 传入shell 的参数
	 * @return
	 */
	public static Map<String,Object> exeShellDownFile(String shellFileName,String downFileName){
		
		
		Map<String,Object> result = new HashMap<String,Object>();
		
		String osname = System.getProperty("os.name");
		String shellPath = getShellPath(osname);
		System.out.println("当前的操作系统是："+osname);
		
		ProcessBuilder builder;
		
		if((null != osname) && osname.toLowerCase().startsWith("win")) {
			//windows 操作系统
			builder = new ProcessBuilder("cmd","/c",shellPath+"/"+shellFileName,downFileName);
		}else {//Linux
			builder = new ProcessBuilder("/bin/sh",shellPath+"/"+shellFileName,downFileName);
		}
		
		
		int runningStatus = 0;
		String s = null;
		StringBuffer sb = new StringBuffer();
		BufferedReader stdInput = null;
		BufferedReader stdError = null;
		
		try {
			
			Process p = builder.start();
			
			stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
			stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
			
			
			while((s = stdInput.readLine()) != null) {
				System.out.println("shell log :"+ s);
				sb.append(s);
			}
			
			while((s = stdError.readLine()) != null) {
				System.out.println("shell error log :"+ s);
				sb.append(s);
			}
			
			try {
				runningStatus = p.waitFor();
			}catch (Exception e) {
				runningStatus = 1;
				sb.append(e.getMessage());
				System.out.println("等待shell 执行反馈时，报错");
				e.printStackTrace();
			}
			
			
		}catch (Exception e) {
			runningStatus = 1;
			sb.append(e.getMessage());
			System.out.println("执行下shell 文件，报错");
			e.printStackTrace();
		} finally {
			closeStream(stdInput);
			closeStream(stdError);
		}
		
		System.out.println("执行状态为："+runningStatus);
		
		if(runningStatus == 0) {
			result.put("code", "1");
			result.put("msg", "执行成功");
		}else {
			result.put("code", "0");
			result.put("msg", "执行shell失败:"+sb.toString());
		}
		return result;
	}
	
	
	
	
	private static String getShellPath(String osname) {
		// TODO Auto-generated method stub
		return "D://";
	}




	private static void closeStream(BufferedReader reader) {
			try {
				if(reader != null) {
					reader.close();
				}
			} catch (Exception e) {
				reader = null;
			}
	}




	public static void main(String[] args) {
		exeShellDownFile("downFileShell.sh", "test.pdf");
	}

}

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特意去看了
new ProcessBuilder（） 的构造方法的源码
内部的逻辑其实很简单，第一个参数为执行方法，后面的参数就是进行参数加空格拼接

如：ProcessBuilder builder = new ProcessBuilder("/bin/sh","/home/user/downFileShell.sh","test.pdf","20230101");
		
最后组成的 shell 执行语句 :
/bin/sh /home/user/downFileShell.sh test.pdf 20230101
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test.pdf 作为第一个参数
20230101 作为第二个参数
多参数，依次类推
shell 中获取参数的方式 顺带一笔

fileName=$1
exeDate=$2

echo $fileName
echo $exeDate

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输出就是：
test.pdf
20230101