【博客搬家】java中exec函数使用说明

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本文介绍Java中Runtime类的exec函数用法，通过示例展示如何在Windows系统下启动外部应用程序并获取其输出与错误流。

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http://key.blog.ccidnet.com/blog-htm-do-showone-uid-22191-type-blog-itemid-60734.html

Process process = Runtime.getRuntime().exec ("ls");
说明:
1.     exec的必须是可执行的程序，如果是命令行的命令则还需另外处理
2.     在windows中process = runtime.exec(new String[] { "cmd.exe","/C", "dir"});
3.     在linux中process = runtime.exec(new String[] { "/bin/sh","-c", "echo $PATH"});

Windows中exec应用示例：
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;

public class compiler {

    public static void main(String[] args) {

        Runtime runtime = Runtime.getRuntime();
        Process process = null;
        String line = null;
        InputStream is = null;
        InputStream es = null;
        InputStreamReader isr = null;
        InputStreamReader esr = null;
        BufferedReader ibr = null;
        BufferedReader ebr = null;
        String[] env = null;
        File file = new File("D://3.1.2//eclipse");

        try {
              process = runtime.exec(new String[] { "cmd.exe", "/C",
                      "eclipse -nl english" }, null, file);
        } catch (IOException e) {
              System.out.println(e);
        }
        // 取得子进程的输出流
        is = process.getInputStream();
        isr = new InputStreamReader(is);
        ibr = new BufferedReader(isr);
        // 取得子进程的错误流
        es = process.getErrorStream();
        esr = new InputStreamReader(es);
        ebr = new BufferedReader(esr);
        /***********************************************************************
          * 如果子进程还要求有输入，则增加这样的方法
          * OutputStream outputToChild =process.getOutputStream(); try { outputToChild.write(("your_command" +
          * "/n").getBytes());
          * outputToChild.flush(); }
          * catch (IOException e) {
          * System.out.println(e); }
          */
        try {
              while ((line = ibr.readLine()) != null) {
                  System.out.println(line);
              }
        } catch (IOException e) {
              System.out.println(e);
              e.printStackTrace();
        }

        try {
              while ((line = ebr.readLine()) != null) {
                  System.out.println(line);
              }
        } catch (IOException e) {
              System.out.println(e);
              e.printStackTrace();
        }

    }
}