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qiniu-suits is a efficient tools for qiniu api implemented by java8.

There is a newer version: 8.4.8

package com.qiniu.util;

import java.io.IOException;

public class FileNameUtils {

    public static String realPathWithUserHome(String pathStr) throws IOException {
        if (pathStr == null || "".equals(pathStr)) throw new IOException("the path is empty.");
        if (pathStr.startsWith("~" + System.getProperty("file.separator"))) {
            return System.getProperty("user.home") + pathStr.substring(1);
        } else {
            return pathStr;
        }
    }

    public static String rmPrefix(String prefix, String name) {
        if (prefix == null || "".equals(prefix) || name.length() < prefix.length()) return name;
        return name.substring(0, prefix.length()).replace(prefix, "") + name.substring(prefix.length());
    }

    public static String addSuffix(String name, String suffix) {
        return name + suffix;
    }

    public static String addPrefix(String prefix, String name) {
        return prefix + name;
    }

    public static String addPrefixAndSuffixKeepExt(String prefix, String name, String suffix) {

        return prefix + addSuffixKeepExt(name, suffix);
    }

    public static String addSuffixKeepExt(String name, String suffix) {

        return addSuffixWithExt(name, suffix, null);
    }

    public static String addPrefixAndSuffixWithExt(String prefix, String name, String suffix, String ext) {
        return prefix + addSuffixWithExt(name, suffix, ext);
    }

    public static String replaceExt(String name, String ext) {
        return addSuffixWithExt(name, "", ext);
    }

    public static String addSuffixWithExt(String name, String suffix, String ext) {
        if (name == null) return null;
        String[] items = getNameItems(name);
        return items[0] + suffix + (ext != null && !"".equals(ext) ?  "." + ext :
                (items[1] == null || "".equals(items[1]) ? "" : "." + items[1]));
    }

    public static String[] getNameItems(String name) {
        String[] items = name.split("\\.");
        if (items.length < 2) {
            return new String[]{items[0], ""};
        }
        StringBuilder shortName = new StringBuilder();
        for (int i = 0; i < items.length - 1; i++) {
            shortName.append(items[i]).append(".");
        }
        return new String[]{shortName.toString().substring(0, shortName.length() - 1), items[items.length - 1]};
    }
}