JAVA读写文件详解编程语言

 1      /** 
 2      *  
 3      * @Description: 写文件 
 4      * @param @param url 要写到服务器的路径 
 5      * @param @param fileName 要写的文件名 需要加前缀 如 .txt 
 6      * @param @param bodydata 要写的内容  
 7      * @param @return 成功返回1 失败返回0 
 8      * @return String 
 9      */ 
10     public static String  writeFile (String url,String fileName,byte[] bodydata){ 
11         StringBuffer sb = new StringBuffer(); 
12         String message = ""; 
13         try{ 
14             sb.append(url).append(fileName); 
15             BufferedWriter  bw = new BufferedWriter(new OutputStreamWriter(new BufferedOutputStream(new FileOutputStream(sb.toString(), true)), "UTF-8")); 
16                 bw.write(new String(bodydata,"UTF-8")); 
17             message = "1"; 
18             bw.flush(); 
19             bw.close(); 
20             System.out.println("运行完毕！！！"); 
21         }catch(Exception e){ 
22             message = "0"; 
23             e.printStackTrace(); 
24         } 
25         return message; 
26     } 
27  
28       /** 
29      *  
30      * @Description: 读文件 
31      * @param @param filename 文件路径名加文件名 
32      * @param @return  
33      * @return byte[] 
34      */ 
35     public static byte[] readFileByte(String filename){   
36         BufferedInputStream in = null;  
37         ByteArrayOutputStream bos = null; 
38         try{ 
39             File file = new File(filename);   
40             if(file.isFile() && file.exists()){ //判断文件是否存在 
41                 bos = new ByteArrayOutputStream((int)file.length());   
42                 in = new BufferedInputStream(new FileInputStream(file));   
43                 int buf_size = 1024;   
44                 byte[] buffer = new byte[buf_size];   
45                 int len = 0;   
46                 while(-1 != (len = in.read(buffer,0,buf_size))){   
47                     bos.write(buffer,0,len);   
48                 }   
49             }else{ 
50                 System.out.println("找不到指定的文件"); 
51             } 
52             in.close();  
53             bos.close();  
54         }catch(Exception e){ 
55             e.printStackTrace(); 
56         } 
57         return bos.toByteArray();   
58      } 
59  
60       /** 
61      *  
62      * @Description: 读文件 
63      * @param @param filepath 要读的文件的路径加文件名称 
64      * @param @param encoding 编码格式 
65      * @param @return 成功返回 1 失败返回 0 
66      * @return String 
67      */ 
68     public static String readFileLine(String filepath,String encoding) { 
69         String message = ""; 
70         try { 
71             File file=new File(filepath); 
72             if(file.isFile() && file.exists()){ //判断文件是否存在 
73                 InputStreamReader read = new InputStreamReader(new FileInputStream(file),encoding);//考虑到编码格式 
74                 BufferedReader bufferedReader = new BufferedReader(read); 
75                 String lineTxt = null; 
76                 while((lineTxt = bufferedReader.readLine()) != null){ 
77                     System.out.println(lineTxt); 
78                 } 
79                 read.close(); 
80             }else{ 
81                 System.out.println("找不到指定的文件"); 
82             } 
83          }catch (Exception e) { 
84              System.out.println("读取文件内容出错"); 
85              e.printStackTrace(); 
86          } 
87         return message; 
88     }