扫描单文件夹

File fileTest = new File("D:\\测试文件夹");
String[] fileList = fileTest.list();
for (int i = 0; i < fileList.length; i++) {
    String string = fileList[i];
    File file = new File(fileTest.getPath(), string);
    int i1 = string.lastIndexOf(" ");
    if(i1 == -1){
        continue;
    }
    String s = string.substring(i1);
    File fileNew = new File(fileTest.getPath(), s);
    file.renameTo(fileNew);
}

递归扫描所有文件和文件夹

public void find(String pathName) throws IOException {
    //获取pathName的File对象
    File dirFile = new File(pathName);

    //获取此目录下的所有文件名与目录名
    String[] fileList = dirFile.list();

    for (int i = 0; i < fileList.length; i++) {
        //遍历文件目录
        String string = fileList[i];
        File file = new File(dirFile.getPath(), string);
        int i1 = string.lastIndexOf(" ");
        if(i1 == -1){
            continue;
        }
        String s = string.substring(i1);
        File fileNew = new File(dirFile.getPath(), s);
        file.renameTo(fileNew);
        //如果是一个目录，输出目录名后，进行递归
        if (fileNew.isDirectory()) {
            //递归
            find(fileNew.getCanonicalPath());
        }
    }
}

find("D:\\测试文件夹");

To Be Continued！😎