利用BufferedInputStream bufferedOutputStream读写文件_用bufferinputstream,bufferedoutputstream完成文件的读入

    import java.io.BufferedInputStream;  
    import java.io.BufferedOutputStream;  
    import java.io.ByteArrayOutputStream;  
    import java.io.FileInputStream;  
    import java.io.FileNotFoundException;  
    import java.io.FileOutputStream;  
    import java.io.IOException;  
      
    public class FileTools {  
        public static byte[] readFile(String string) {  
            FileInputStream fileInputStream=null;  
            BufferedInputStream bufferedInputStream=null;  
            ByteArrayOutputStream bao=new ByteArrayOutputStream();  
            byte[] buff=new byte[1024];  
            try {  
                fileInputStream=new FileInputStream(string);  
                bufferedInputStream=new BufferedInputStream(fileInputStream);  
                int bytesRead=0;  
                while (-1!=(bytesRead=bufferedInputStream.read(buff,0,buff.length))) {  
                    bao.write(buff,0,bytesRead);  
                }  
            } catch (FileNotFoundException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            } catch (IOException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            }finally{  
                try {  
                    fileInputStream.close();  
                    bufferedInputStream.close();  
                    buff=null;  
                } catch (IOException e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                }  
            }  
            return bao.toByteArray();  
        }  
      
        public static void writeFile(String string,byte[] bytes) {  
            FileOutputStream fileOutputStream=null;  
            BufferedOutputStream bufferedOutputStream=null;  
            try{  
                fileOutputStream=new FileOutputStream(string);  
                bufferedOutputStream =new BufferedOutputStream(fileOutputStream);  
                bufferedOutputStream.write(bytes);  
            } catch (IOException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            }finally{  
                try {  
                    bufferedOutputStream.flush();  
                    fileOutputStream.close();  
                    bufferedOutputStream.close();  
                } catch (IOException e) {  
                    // TODO Auto-generated catch block  
                    e.printStackTrace();  
                }  
            }  
        }  
    }  

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