搜寻E盘的说有jpg图片

搜索E盘的说有jpg图片
import java.io.*;

public class SearchPicture{
  static int j=0;
  static FileWriter w = null;
 
public static void main(String args[]){
try{FileWriter FW = new FileWriter("d:\\picture.txt");
   FW.write("");
   FW.close();
}catch(IOException a){a.printStackTrace();}
File f = new File("e:\");
tree(f);
System.out.println("总共"+j+"张图片");
try{FileWriter FW = new FileWriter("d:\\picture.txt",true);
   FW.write("总共"+j+"张图片");
   FW.close();
}catch(IOException a){a.printStackTrace();}
}

public static void tree(File f){
String[] s = null;
File[] trees = null;
trees = f.listFiles();
for(int i=0;i<trees.length;i++)
{
  if(trees[i].isDirectory()&&trees[i].listFiles()!=null){
    tree(trees[i]);
}
  s = trees[i].getName().split("\\.");
        if(s[s.length-1].equals("jpg")) {
   System.out.println(trees[i].getAbsolutePath());
    try{
  w = new FileWriter("d:\\picture.txt",true);
  w.write(trees[i].getAbsolutePath());
  w.write(13);
  w.write(10);
  //w.write("\n\r");
  w.flush();
          w.close();  
        }catch(IOException e){
           e.printStackTrace();
           }
     j++;
     }
}
}
}