JavaScript escape/unescape编码的Java实现

符合 JavaScript unescape 函数(支持Unicode)的 Java escape 编码实现
最近在弄一个跨域的交互程序,交互过程非常复杂.而且,其中一端只能使用 javascript 来处理返回.
于是,发现 Java 的 URLEncoder.encode 方法与 JavaScript 的 unescape 方法已经不能兼容了.
现在浏览器的主流版本中 JavaScript 已经开始使用 Unicode 作为字符串的内码进行编码.即, Unicode 字符 escape 之后的样子类似于 %uABCD 而 java 的 URLEncoder.encode 方法得到的结果是 %AB%CD ,转换出来的结果必定是乱码了.
方法有两个,其一,用 Java 实现一个生成新编码的方法.其二,用 JavaScript 实现一个针对旧编码的解码方法.想了想,还是用 Java 要方便一点点吧.
上次贴出的 escape 的 java 实现,似乎对大家有用.最近曾军同学提出 unescape 对于 javascript 与后端的交互也有意义.于是就一并实现了.再次贴上来.
代码非常简单,注释就免了吧.一贯的,仍然遵循"以空间换时间"原则.
需要的桶子,一贯的,help yourself.
/**
 * JavaScript escape/unescape 编码的 Java 实现
 * author jackyz
 * keep this copyright info while using this method by free
 */
public class Escape {
    private final static String[] hex = {
        "00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",
        "10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",
        "20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",
        "30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F",