Java将一个目录下的所有数据复制到另一个目录下

Posted 2020-09-09 wangtianze

 1 /*
 2     将"C:\\JavaProducts\\Source"下的所有数据复制到"C:\\Target"下
 3 */
 4 
 5 import java.io.*;
 6 
 7 public class JavaCopyDemo{
 8     final static String SOURCESTRING = "C:\\JavaProducts\\Source";
 9     final static String TARGETSTRING = "C:\\Target";
10     
11     public static void main(String[] args){
12         if(!(new File(SOURCESTRING)).exists()){
13             System.out.println("源文件" + SOURCESTRING + "不存在，无法复制！");
14             return;
15         }else if((new File(TARGETSTRING)).exists()){
16             System.out.println("目标文件" + TARGETSTRING + "已经存在，无法复制！");
17             return;
18         }else{
19             if((new File(SOURCESTRING)).isFile()){
20                 copyFile(new File(SOURCESTRING),new File(TARGETSTRING));
21             }else if((new File(SOURCESTRING)).isDirectory()){
22                 copyDirectory(SOURCESTRING,TARGETSTRING);
23             }
24         }
25     }
26     
27     private static void copyFile(File sourceFile,File targetFile){
28         if(!sourceFile.canRead()){
29             System.out.println("源文件" + sourceFile.getAbsolutePath() + "不可读，无法复制！");
30             return;
31         }else{
32             System.out.println("开始复制文件" + sourceFile.getAbsolutePath() + "到" + targetFile.getAbsolutePath());
33             FileInputStream fis = null;
34             BufferedInputStream bis = null;
35             FileOutputStream fos = null;
36             BufferedOutputStream bos = null;
37             
38             try{
39                 fis = new FileInputStream(sourceFile);
40                 bis = new BufferedInputStream(fis);
41                 fos = new FileOutputStream(targetFile);
42                 bos = new BufferedOutputStream(fos);
43                 int len = 0;
44                 while((len = bis.read()) != -1){
45                     bos.write(len);    
46                 }
47                 bos.flush();
48                 
49             }catch(FileNotFoundException e){
50                 e.printStackTrace();    
51             }catch(IOException e){
52                 e.printStackTrace();
53             }finally{
54                 try{
55                     if(fis != null){
56                         fis.close();    
57                     }
58                     if(bis != null){
59                         bis.close();    
60                     }
61                     if(fos != null){
62                         fos.close();    
63                     }
64                     if(bos != null){
65                         bos.close();    
66                     }
67                     System.out.println("文件" + sourceFile.getAbsolutePath() + "复制到" + targetFile.getAbsolutePath() + "完成");
68                 }catch(IOException e){
69                     e.printStackTrace();
70                 }
71             }
72         }
73     }
74     
75     private static void copyDirectory(String sourcePathString,String targetPathString){
76         if(!new File(sourcePathString).canRead()){
77             System.out.println("源文件夹" + sourcePathString + "不可读，无法复制！");
78             return;
79         }else{
80             (new File(targetPathString)).mkdirs();
81             System.out.println("开始复制文件夹" + sourcePathString + "到" + targetPathString);
82             File[] files = new File(sourcePathString).listFiles();
83             for(int i = 0; i < files.length; i++){
84                 if(files[i].isFile()){
85                     copyFile(new File(sourcePathString + File.separator + files[i].getName()),new File(targetPathString + File.separator + files[i].getName()));    
86                 }else if(files[i].isDirectory()){
87                     copyDirectory(sourcePathString + File.separator + files[i].getName(),targetPathString + File.separator + files[i].getName());
88                 }    
89             }
90             System.out.println("复制文件夹" + sourcePathString + "到" + targetPathString + "结束");
91         }
92     }
93 }