Java copies a file to a new folder and renames the new file

Requirement: Copy picture A from folder A to new file B. If there is no new folder B, create a new one B and change the name of picture A to B.

Path:/Users/mgx/apache-tomcat-8.5.78/webapps/img/testimg.jpg

 

Code:

    /**
     * 将图片A从文件夹A,复制新文件B并将图片A的名称改为B,
     * @param newPath 新文件夹路径
     * @param oldPath 图片地址
     * @param newFileName 新文件名
     * @throws Exception 异常
     */
    public static void copyNewFileAndRename(String newPath,String oldPath,String newFileName) throws Exception{
        //需要复制到的路径，以及图片的新命名+格式
        File result = new File(newPath + newFileName);
        //判断该文件夹是否存在,不存在则新增
        if (!result.getParentFile().exists()){
            result.getParentFile().mkdirs();
        }
        //需要复制的原图的路径+图片名+ .png(这是该图片的格式)
        FileInputStream input = new FileInputStream(oldPath);
        FileOutputStream out = new FileOutputStream(result);
        //一个容量，相当于打水的桶，可以自定义大小
        byte[] buffer = new byte[100];
        int hasRead = 0;
        while ((hasRead = input.read(buffer)) > 0) {
            //0：表示每次从0开始
            out.write(buffer, 0, hasRead);
        }
        System.out.println(result.getAbsolutePath());
        input.close();
        out.close();
    }


    public static void main(String[] args) throws Exception {
        String oldPath = "/Users/mgx/apache-tomcat-8.5.78/webapps/img/testimg.jpg";
        String newPath = "/Users/mgx/apache-tomcat-8.5.78/webapps/img/yuhang/";
        String newFileName = "12180606120934678_02.jpg";
        FileKit.copyNewFileAndRename(newPath,oldPath,newFileName);
    }

After execution:

Path:/Users/mgx/apache-tomcat-8.5.78/webapps/img/yuhang/

Path:/Users/mgx/apache-tomcat-8.5.78/webapps/img/yuhang/12180606120934678_02.jpg