java 常用IO操作

    package com.syj.util;

        import java.io.BufferedReader;
        import java.io.BufferedWriter;
        import java.io.ByteArrayInputStream;
        import java.io.ByteArrayOutputStream;
        import java.io.File;
        import java.io.FileInputStream;
        import java.io.FileOutputStream;
        import java.io.FileReader;
        import java.io.FileWriter;
        import java.io.IOException;
        import java.io.InputStream;
        import java.io.InputStreamReader;
        import java.io.ObjectInputStream;
        import java.io.ObjectOutputStream;
        import java.io.OutputStream;
        import java.io.PrintWriter;
        import java.io.StringReader;
        import java.util.Arrays;

        /**
         *

         * Title:IO工具类
         *

         *
         *

         * Description:常用的IO操作封装
         *

         *
         *

         * Copyright: 转载请注明出处         * @date Jun 15, 2008 4:37:58 PM
         */

        public class IOUtil {
         /**
          * 缓冲区大小 1MB
          */
         private static final int BUFFER_SIZE = 1024 * 1024;

         /**
          *
          * Description: 将输入流输出到输出流
          *
         * @param in
          *            输入流
          * @param out
          *            输出流
          * @param bufferSize
          *            缓冲区大小
          * @throws IOException
          * @mail           * @since：Jun 15, 2008 4:52:41 PM
          */
         public static ByteArrayOutputStream readFileToByteStream(File file)
           throws IOException {

          FileInputStream fis = null;
          ByteArrayOutputStream bos = null;
          try {
           fis = new FileInputStream(file);
           bos = new ByteArrayOutputStream();
           in2OutStream(fis, bos, BUFFER_SIZE);
          } finally {
           if (fis != null)
            fis.close();
          }

          return bos;

         }

         /**
          *
          * Description:读取文件返回字节数组
          *
          * @param file
          *            文件
          * @return 字节数组
          * @throws IOException
          * @mail           * @since：Jun 15, 2008 5:46:32 PM
          */
         public static String readFileToString(File file) throws IOException {

          StringBuffer sb = null;
          BufferedReader in = null;
          try {
           in = new BufferedReader(new FileReader(file));
           sb = new StringBuffer();
           for (String line; (line = in.readLine()) != null;) {
            sb.append(line + "\r\n");
           }
          } finally {
           if (in != null)
            in.close();
          }

          return sb.toString();

         }

         /**
          *
          * Description:复制文件
          *
          * @param src
          *            源文件
          * @param dest
          *            目标文件
          * @param cover
          *            是否覆盖
          * @throws IOException
          * @mail 【责编:landy】

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