Java合并文件，并限制合并后文件大小

合并一个文件夹下的n个小文件，合并后的大文件最大10MB，超出后继续合并其余小文件到，还是最大10MB，以此类推。
麻烦帮我看看那儿错了，我只能限制第一个大文件10MB，后面的就不行了！
多谢！
import java.io.*;

public class FilesIn {

public static void main(String[] args) {

    File dir = new File("E://testdata");                        
    File out=new File("E://Separator");
    try {
        SaveFile(dir,out);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }   
}

    static void SaveFile(File dir, File dst) throws IOException {

    String[] children = dir.list();
    FilenameFilter filter = new FilenameFilter(){

        public boolean accept(File dir, String name) {
            return true;    

        }
    };


    File filePath = new File("E://Separator");
    String fileIndex="0";
    File FileBig = new File(filePath + "/" + "Files"+"_"+fileIndex); 
    BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(FileBig));

    children = dir.list(filter);

for (int i = 0; i < children.length; i++){  

   String inhalt = children[i];
   FileInputStream in=new FileInputStream(dir+"/" + inhalt); 

            byte[] buffer = new byte[1024];
            int len;
  if(FileBig.length()/1024/1024<10){
        while ( (len = in.read(buffer)) > 0) {
          out.write(buffer, 0, len);

        } //out.close();
         }
   else
    { 
       int fileIndexInt = Integer.parseInt(fileIndex)+1;
        File FileBig1 = new File(filePath + "/" + "Files"+"_"+fileIndexInt);
        BufferedOutputStream out1=new BufferedOutputStream(new FileOutputStream(FileBig1));

        while (  (len = in.read(buffer)) > 0) {
          out1.write(buffer, 0, len);
          out.close();
         }out1.close();

       fileIndex = String.valueOf(fileIndexInt); 
    }
 }

out.close();
}
}

应该把 else里的 File FileBig1 改成 FileBig,具体把我写的for替换掉你的for就应该可以实现了。

for (int i = 0; i < children.length; i++) {

        String inhalt = children[i];
        FileInputStream in = new FileInputStream(dir + "/" + inhalt);

        byte[] buffer = new byte[1024];
        int len=0;
        if (FileBig.length() / 1024 / 1024 < 10) {
            while ((len = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);

            }
            out.flush();// out.close();
        } else {
            int fileIndexInt = Integer.parseInt(fileIndex) + 1;
            FileBig = new File(filePath + "/" + "Files" + "_"
                    + fileIndexInt);
            out = new BufferedOutputStream(
                    new FileOutputStream(FileBig));

            while ((len = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);                  
            }
            out.flush();
            //out.close();

            fileIndex = String.valueOf(fileIndexInt);
        }
    }code]

[code="java"]
final int MAX_LENGTH = 10 * 1024 * 1024;

//...
for (int i = 0; i /*小於*/ children.length; i++) {

if (fileBig.length() >= MAX_LENGTH) {
    fileBig.close();
    fileIndex++;
    fileBig = new File(filePath + File.separator + "FILE" + fileIndex);
    // FileOutputStream out = new .....
}
// read and write
out.flush();

}
[/code]

问题就是你都把File [color=red]FileBig [/color]= new File(filePath + "/" + "Files"+"_"+fileIndex);
BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(FileBig));
filebig定义在循环的外面，写完第一个大文件后，你又不新建一个新的大文件