JAVA读写文件

1 1      /**
2 2      * 
3 3      * @Description: 写文件
4 4      * @param @param url 要写到服务器的路径
5 5      * @param @param fileName 要写的文件名 需要加前缀 如 .txt
6 6      * @param @param bodydata 要写的内容 
7 7      * @param @return 成功返回1 失败返回0
8 8      * @return String
9 9      */
1010     public static String  writeFile (String url,String fileName,byte[] bodydata){
1111         StringBuffer sb = new StringBuffer();
1212         String message = "";
1313         try{
1414             sb.append(url).append(fileName);
1515             BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(new BufferedOutputStream(new FileOutputStream(sb.toString(), true)), "UTF-8"));
1616                 bw.write(new String(bodydata,"UTF-8"));
1717             message = "1";
1818             bw.flush();
1919             bw.close();
2020             System.out.println("运行完毕！！！");
2121         }catch(Exception e){
2222             message = "0";
2323             e.printStackTrace();
2424         }
2525         return message;
2626     }
2727 
2828       /**
2929      * 
3030      * @Description: 读文件
3131      * @param @param filename 文件路径名加文件名
3232      * @param @return 
3333      * @return byte[]
3434      */
3535     public static byte[] readFileByte(String filename){  
3636         BufferedInputStream in = null; 
3737         ByteArrayOutputStream bos = null;
3838         try{
3939             File file = new File(filename);  
4040             if(file.isFile() && file.exists()){ //判断文件是否存在
4141                 bos = new ByteArrayOutputStream((int)file.length());  
4242                 in = new BufferedInputStream(new FileInputStream(file));  
4343                 int buf_size = 1024;  
4444                 byte[] buffer = new byte[buf_size];  
4545                 int len = 0;  
4646                 while(-1 != (len = in.read(buffer,0,buf_size))){  
4747                     bos.write(buffer,0,len);  
4848                 }  
4949             }else{
5050                 System.out.println("找不到指定的文件");
5151             }
5252             in.close(); 
5353             bos.close(); 
5454         }catch(Exception e){
5555             e.printStackTrace();
5656         }
5757         return bos.toByteArray();  
5858      }
5959 
6060       /**
6161      * 
6262      * @Description: 读文件
6363      * @param @param filepath 要读的文件的路径加文件名称
6464      * @param @param encoding 编码格式
6565      * @param @return 成功返回 1 失败返回 0
6666      * @return String
6767      */
6868     public static String readFileLine(String filepath,String encoding) {
6969         String message = "";
7070         try {
7171             File file=new File(filepath);
7272             if(file.isFile() && file.exists()){ //判断文件是否存在
7373                 InputStreamReader read = new InputStreamReader(new FileInputStream(file),encoding);//考虑到编码格式
7474                 BufferedReader bufferedReader = new BufferedReader(read);
7575                 String lineTxt = null;
7676                 while((lineTxt = bufferedReader.readLine()) != null){
7777                     System.out.println(lineTxt);
7878                 }
7979                 read.close();
8080             }else{
8181                 System.out.println("找不到指定的文件");
8282             }
8383          }catch (Exception e) {
8484              System.out.println("读取文件内容出错");
8585              e.printStackTrace();
8686          }
8787         return message;
8888     }