文件读写的工具类

Posted 2020-08-07 奔跑的大龙猫

 1 package test;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.File;
 5 import java.io.FileOutputStream;
 6 import java.io.FileReader;
 7 import java.io.IOException;
 8 import java.io.UnsupportedEncodingException;
 9 import java.text.SimpleDateFormat;
10 import java.util.Date;
11 
12 public class FileOperation {
13   /**
14    *  生成文件
15    *  @param fileName
16    */
17   public static boolean createFile(File fileName){
18     if(!fileName.exists()){  
19       try {
20         fileName.createNewFile();
21       } catch (Exception e) {
22         // TODO Auto-generated catch block
23         e.printStackTrace();
24       }
25     }
26     return true;
27   }
28   
29   /**
30    * @description 读文件
31    * @throws IOException 
32    */
33   public static String readTxtFile(File fileName) throws IOException{
34     String result = null;
35     FileReader fileReader = null;
36     BufferedReader bufferedReader = null;
37     fileReader = new FileReader(fileName);
38     bufferedReader = new BufferedReader(fileReader);
39     
40     String read = null;
41     int count = 0;
42     while((read = bufferedReader.readLine()) != null){
43       result = result + count + read + "\r\n";
44       count++;
45     }
46     
47     if(bufferedReader != null){
48       bufferedReader.close();
49     }
50     
51     if(fileReader != null){
52         fileReader.close();
53     }
54     
55     System.out.println("¶ÁÈ¡ÎļþµÄÄÚÈÝÊÇ£º " + "\r\n" + result);
56     return result;
57   }
58   
59   /**
60    * @description 写文件
61    * @param args
62    * @throws UnsupportedEncodingException 
63    * @throws IOException
64    */
65   public static boolean writeTxtFile(String content,File fileName) throws UnsupportedEncodingException, IOException{
66     FileOutputStream o = null;
67     o = new FileOutputStream(fileName);
68     o.write(content.getBytes("UTF-8"));
69     o.close();
70     return true; 
71   }
72   
73   /**
74    * @description 单元测试
75    * @throws IOException
76    */
77   public static void main(String[] args) throws IOException {
78     File file = new File("d:/hello.txt");
79     Date date = new Date();
80     SimpleDateFormat day = new SimpleDateFormat("yyyyMMddHHmmss");
81     String dateName = day.format(date);
82     File copyFile = new File("d:/" + dateName + ".txt");
83     String content = readTxtFile(file);
84     createFile(copyFile);
85     writeTxtFile(content,copyFile);
86   }
87 }