import java.io.BufferedInputStream;

 import java.io.BufferedOutputStream;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.InputStream;

 import java.io.OutputStream;

 /**

  * 测试文件的读取、写入、复制功能

  * @package :java05

  * @author shaobn

  * @Describe :测试文件的读取、写入、复制功能

  * @Time: 2015-9-5 下午10:50:18

  */

 public class TestCopyText {

     public static void main(String[] args) throws Exception{

         //读取文件并打印

         System.out.println(readText(new FileInputStream("D:\\hello.txt")));

         //写入内容至文件

         writeText(new FileOutputStream("D:\\hellocopy.txt"), "您好，读写文件一般都用字符流，这种方式不推荐！");

         //复制文件，上面写入文件内容不变

         writeText(new FileOutputStream("D:\\hellocopy.txt",true),readText(new FileInputStream("D:\\hello.txt")));

     }

     //用FileInputStream读取文件

     public static String readText(InputStream is){

         BufferedInputStream bis = null;

         String str = null;

         try {

             bis = new BufferedInputStream(is);

             int len = 0;

             byte[] by = new byte[1024];

             while((len=bis.read(by))!=-1){

                 str = new String(by,0,len);

             }

         } catch (Exception e) {

             // TODO: handle exception

             e.printStackTrace();

         }finally{

             try {

                 if(bis!=null){

                     bis.close();

                     return str;

                 }

             } catch (Exception e2) {

                 // TODO: handle exception

                 e2.printStackTrace();

             }

         }

         return str;

     }

     //用FileOutputStream写入文件

     public static void writeText(OutputStream os,String str){

         BufferedOutputStream bos = null;

         try {

             bos = new BufferedOutputStream(os);

             bos.write(str.getBytes());

         } catch (Exception e) {

             // TODO: handle exception

             e.printStackTrace();

         }finally{

             try{

             if(bos!=null){

                 bos.close();

             }

             }catch (Exception e) {

                 // TODO: handle exception

                 e.printStackTrace();

             }

         }

     }

 }