求高手将一段JS代码转换成以Java来实现

[cancait]

请高手将以下Javascript改成Java实现。如能实现50分相赠。不够另加分。

//-----------
function Generate_Brief(text,length){
if(text.length < length) return text;
var Foremost = text.substr(0,length);

var re = /<(\/?)(BODY|STYLE|SCRIPT|P|DIV|H1|H2|H3|H4|H5|H6|ADDRESS|PRE|TABLE|TR|TD|TH|INPUT|SELECT|TEXTAREA|OBJECT|A|UL|OL|LI|BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|SPAN)[^>]*(>?)/ig;

var Singlable = /BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT/i
var Stack = new Array(), posStack = new Array();
while(true){
var newone = re.exec(Foremost);
if(newone == null) break;

if(newone[1] == ""){
var Elem = newone[2];
if(Elem.match(Singlable) && newone[3]!= ""){
continue;
}
Stack.push(newone[2].toUpperCase());
posStack.push(newone.index);

if(newone[3] == "") break;
}else{
var StackTop = Stack[Stack.length-1];
var End = newone[2].toUpperCase();
if(StackTop == End){
Stack.pop();
posStack.pop();
if(newone[3] == ""){
Foremost = Foremost+">";
}
}

};
}
var cutpos = posStack.shift();
Foremost = Foremost.substring(0,cutpos);

return Foremost;
}

[majia1hao]

请放狗搜索 javascript的正则表达式

[joejoe1991]

汗啊 懒的看。 你直接说这些代码是啥功能吧。。