调用系统的DOS命令方法执行需要的命令

package com.huaweisymantec.core.utils;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 命令行命令执行工具类
 * 
 * @author s00108907
 * 
 */
public final class CommandUtils {

    private static final Logger LOG = LoggerFactory.getLogger(CommandUtils.class);

    /**
     * 调用系统的DOS命令方法执行需要的命令
     * 
     * @param command 要执行的命令
     * @return 执行结果
     * @throws IOException
     */
    public static String exec(String command) throws IOException {
        return exec(null, command);
    }

    /**
     * 调用系统的DOS命令方法执行需要的命令
     * 
     * @param directory 此进程的工作目录
     * @param command 要执行的命令
     * @return 执行结果
     * @throws IOException
     */
    public static String exec(String directory, String command) throws IOException {
        InputStream in = null;
        Reader reader = null;
        BufferedReader br = null;
        try {
            ProcessBuilder pb;
            if (System.getProperty("os.name").indexOf("Windows") == -1) {
                pb = new ProcessBuilder("/bin/sh", "-c", command);
            } else {
                pb = new ProcessBuilder("cmd", "/c", command);
            }
            if (StringUtils.isNotBlank(directory)) {
                pb.directory(new File(directory));
            }
            // merge the error output with the standard output
            pb.redirectErrorStream(true);

            LOG.debug("Now exceuting:{}", command);
            Process p = pb.start();
            in = p.getInputStream();
            reader = new InputStreamReader(in, "gb2312");
            br = new BufferedReader(reader);
            StringBuffer lines = new StringBuffer();
            String line = null;
            while ((line = br.readLine()) != null) {
                lines.append(line).append("\r\n");
            }
            LOG.debug("Exceuting result:{}", lines.toString());
            return lines.toString();
        } finally {
            if (reader != null) {
                reader.close();
            }
            if (br != null) {
                br.close();
            }
            if (in != null) {
                in.close();
            }
        }
    }
}