java 修改图片后缀名，不改变图片前缀名

package com.company;

import java.io.File;

public class Main {

public static void main(String[] args) {
// write your code here
    String path="D:/BaiduNetdiskDownload/face/";
    File file = new File(path);
    File[] files=file.listFiles();
    int i=0;
    for(File file1:files){
        if(!file1.isDirectory()){

            String name=file1.getName();
            String fname = name.substring(0,name.lastIndexOf("."));
            file1.renameTo(new File(path+fname + ".gif"));
            i++;
        }
    }
}

}