Androin学习笔记四十六：拷贝文件到另一个目录下

快来打我* 2022-08-22 04:56 175阅读 0赞

出处：[http://blog.csdn.net/etzmico/article/details/7786525][http_blog.csdn.net_etzmico_article_details_7786525]

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1.  /\*\* 
2.   \* 复制单个文件 
3.   \* @param oldPath String 原文件路径 如：c:/fqf.txt 
4.   \* @param newPath String 复制后路径 如：f:/fqf.txt 
5.   \* @return boolean 
6.   \*/
7.  **public****void** copyFile(String oldPath, String newPath) \{ 
8.  **try** \{ 
9.  **int** bytesum = 0; 
10. **int** byteread = 0; 
11.  File oldfile = **new** File(oldPath); 
12. **if** (oldfile.exists()) \{ //文件存在时 
13.  InputStream inStream = **new** FileInputStream(oldPath); //读入原文件 
14.  FileOutputStream fs = **new** FileOutputStream(newPath); 
15. **byte**\[\] buffer = **new****byte**\[1444\]; 
16. **int** length; 
17. **while** ( (byteread = inStream.read(buffer)) != -1) \{ 
18.  bytesum += byteread; //字节数 文件大小 
19.  System.out.println(bytesum); 
20.  fs.write(buffer, 0, byteread); 
21.  \} 
22.  inStream.close(); 
23.  \} 
24.  \} 
25. **catch** (Exception e) \{ 
26.  System.out.println("复制单个文件操作出错"); 
27.  e.printStackTrace(); 
28. 
29.  \} 
30. 
31.  \} 
32. 
33. /\*\* 
34.  \* 复制整个文件夹内容 
35.  \* @param oldPath String 原文件路径 如：c:/fqf 
36.  \* @param newPath String 复制后路径 如：f:/fqf/ff 
37.  \* @return boolean 
38.  \*/
39. **public****void** copyFolder(String oldPath, String newPath) \{ 
40. 
41. **try** \{ 
42.  (**new** File(newPath)).mkdirs(); //如果文件夹不存在 则建立新文件夹 
43.  File a=**new** File(oldPath); 
44.  String\[\] file=a.list(); 
45.  File temp=**null**; 
46. **for** (**int** i = 0; i < file.length; i++) \{ 
47. **if**(oldPath.endsWith(File.separator))\{ 
48.  temp=**new** File(oldPath+file\[i\]); 
49.  \} 
50. **else**\{ 
51.  temp=**new** File(oldPath+File.separator+file\[i\]); 
52.  \} 
53. 
54. **if**(temp.isFile())\{ 
55.  FileInputStream input = **new** FileInputStream(temp); 
56.  FileOutputStream output = **new** FileOutputStream(newPath + "/" \+ 
57.  (temp.getName()).toString()); 
58. **byte**\[\] b = **new****byte**\[1024 \* 5\]; 
59. **int** len; 
60. **while** ( (len = input.read(b)) != -1) \{ 
61.  output.write(b, 0, len); 
62.  \} 
63.  output.flush(); 
64.  output.close(); 
65.  input.close(); 
66.  \} 
67. **if**(temp.isDirectory())\{ //如果是子文件夹 
68.  copyFolder(oldPath+"/"\+file\[i\],newPath+"/"\+file\[i\]); 
69.  \} 
70.  \} 
71.  \} 
72. **catch** (Exception e) \{ 
73.  System.out.println("复制整个文件夹内容操作出错"); 
74.  e.printStackTrace(); 
75. 
76.  \} 
77. 
78.  \}

PS：

拷贝assets目录下文件

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1.  InputStream is = ctx.getAssets().open("test.apk");

特别感谢[jqj1107][]提的建议，写代码时要谨慎，尽可能不使用try/catch，拷贝文件时检查文件属性等参数，确保万无一失

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1.  **if** (!oldfile.exists()) \{ **return** ;\} 
2.  **if** (!oldfile.isFile()) \{ **return** ;\} 
3.  **if** (!oldfile.canRead()) \{ **return** ;\}

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