Process和ProcessBuilder入门【原】

ProcessBuilder优点

ProcessBuilder(XXX).start()和Runtime.exec(XXX)功能相同,主要优点在使用过程中感受有:

前者是jdk1.5后的新方式
配置环境变量时更优雅
对当前目录的控制也更合理
错误流重定向特别方便
进程控制更简洁

ProcessTool.java

package test;import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Map;/*** * @author King* @see* @version createTM：2017年11月23日 下午3:41:38*/
public class ProcessTool {public static void main(String[] args) throws IOException {execWindowCmd();}
public static void execWindowCmd() throws IOException {ProcessBuilder pb = new ProcessBuilder();// 命令Map<String, String> env = pb.environment();// 独立环境变量System.out.println(env);// 打印环境变量env.put("MY_NAME", "KING");// 添加环境变量key-valuepb.redirectErrorStream(true);// 重定向错误输出流到正常输出流try {pb.directory(new File("d://test1"));// 设置目录test1pb.command("cmd", "/c", "dir");// 执行命令
            Process process1;process1 = pb.start();// 启动进程
            BufferedReader br1;br1 = new BufferedReader(new InputStreamReader(process1.getInputStream(), "gbk"));String line1 = null;while ((line1 = br1.readLine()) != null) {System.out.println(line1);}pb.directory(new File("d://test2"));// 设置目录test2pb.command("cmd", "/c", "dir", ">>", "test1.log");// 执行命令,把结果输出到test1.logProcess process2 = pb.start();// 启动进程BufferedReader br2 = new BufferedReader(new InputStreamReader(process2.getInputStream(), "gbk"));String line2 = null;while ((line2 = br2.readLine()) != null) {//因为结果输出到了文件,所以本处无信息返回
                System.out.println(line2);}} catch (IOException e) {e.printStackTrace();throw e;}}
}