1         FileInputStream fis = new FileInputStream("D:\\test\\123\\1.mp3");
 2         int name = 1;
 3         int len = 0;
 4         byte[] b = new byte[1024*1024];
 5         while((len = fis.read(b))!= -1){
 6             FileOutputStream fos = new FileOutputStream("D:\\test\\456\\parts\\" + name + ".mp3");
 7             fos.write(b,0,len);
 8             fos.close();
 9             name++;
10         }

 1         //先创建输入流对象,用循环把文件都读入到内存中
 2         FileOutputStream fos = new FileOutputStream("D:\\test\\123\\aa.mp3");
 3         for(int i = 1;i <= 8;i++){
 4             byte[] b = new byte[1024*1024];
 5             int len = 0;
 6             FileInputStream fis = new FileInputStream("D:\\test\\456\\parts\\" + i + ".mp3");
 7             while((len = fis.read(b))!= -1){
 8                 fos.write(b,0,len);
 9             }
10             fis.close();
11         }
12         fos.close();

 1 public static void main(String[] args) throws Exception {
 2         //先使用过滤器过滤
 3         File dir = new File("D:\\test1");
 4         //使用匿名内部类实现构造器
 5         File[] names = dir.listFiles(new FileFilter() {
 6
 7             @Override
 8             public boolean accept(File pathname) {
 9                 //复写accept函数
10                 return pathname.isFile() && pathname.getName().endsWith(".JPG");
11             }
12         });
13         //name代表的是符合条件的文件的路径,数量是names.length;
14         //使用一个n作为名字的变量的控制器
15         int n =1;
16         for(File name : names){
17 //            if(n >1)
18 //                n++;
19             String s = n + ".JPG";
20             method(name,s);
21             n++;
22         }
23
24     }
25
26     private static void method(File name,String s) throws FileNotFoundException, IOException {
27         //根据具体的name获得对应的输入流对象
28         FileInputStream fis = new FileInputStream(name.getAbsolutePath());
29         //将输入流对象读入到内存中
30         byte[] b = new byte[1024];
31         int len = 0;
32 //        File file = new File("D:\\test1\\pic\\",name.getName());
33         File file = new File("D:\\test1\\pic\\",s);
34         FileOutputStream fos = new FileOutputStream(file);
35         while((len = fis.read(b))!= -1){
36             fos.write(b,0,len);
37         }
38         //System.out.println("1");
39         fos.close();
40     }

 1 public static void main(String[] args) throws Exception {
 2         //
 3         File dir = new File("D:\\test2");
 4         File dest = new File("D:\\test1\\java.txt");
 5
 6         findFolderAndFile(dir,dest);
 7         System.out.println("Done");
 8     }
 9
10
11     private static void findFolderAndFile(File dir,File dest) throws Exception {
12         //列出目标文件中的所有的文件或文件夹,写过滤器
13         File[] files = dir.listFiles(new FileFilter() {
14
15             @Override
16             public boolean accept(File pathname) {
17                 //要获得的是父目录以及其下的子目录,只要满足.java或者是文件夹就可以放行
18                 return pathname.isDirectory() || pathname.getName().endsWith(".java");
19             }
20         });
21         //对files进行遍历
22         for(File file : files){
23             if(file.isFile()){
24                 //这个file就是已经找到的符合条件的.java文件.创建输出流输出到目标文件
25                 FileOutputStream fos = new FileOutputStream(dest,true);
26                 String name = file.getAbsolutePath();
27                 String line_separator = System.getProperty("line.separator");
28                 fos.write((name + line_separator).getBytes());
29             }else{
30                 findFolderAndFile(file,dest);
31             }
32         }
33     }

 1 public static void main(String[] args) throws Exception {
 2         //
 3         File dir = new File("D:\\test1");
 4         File dest = new File("D:\\test3");
 5
 6         findFoldersAndCopy(dir,dest);
 7         System.out.println("done");
 8
 9     }
10
11     private static void findFoldersAndCopy(File dir, File dest) throws Exception {
12         //遍历源文件下所有的文件/文件夹对象
13         File[] files = dir.listFiles();
14         for(File file : files){
15             File destFileName = new File(dest,file.getName());
16             if(file.isFile()){
17                 if(!destFileName.exists())    destFileName.createNewFile();
18                 FileInputStream fis = new FileInputStream(file.getAbsolutePath());
19                 FileOutputStream fos = new FileOutputStream(destFileName);
20                 byte[] b = new byte[1024];
21                 int len = 0;
22                 while ((len = fis.read(b)) != -1) {
23                     fos.write(b, 0, len);
24                 }
25             }
26             if(file.isDirectory()){
27                 if(!destFileName.exists())    destFileName.mkdir();
28                 findFoldersAndCopy(file, destFileName);
29             }
30         }
31
32
33     }