JAVA 特殊字符过滤器

public class SpecialCharacterFilter implements Filter {

@Override
public void destroy() {
// TODO Auto-generated method stub

}

@SuppressWarnings({ "unchecked", "null" })
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain arg2) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest)arg0;
Map map = request.getParameterMap(); //获取request里面所有请求参数。已Key-value形式返回
if(map!=null||map.size()<1){   //有参数时才处理
Set set = map.entrySet();
Iterator ite = set.iterator(); //返回迭代器
while(ite.hasNext()){   //迭代替换参数中的特殊字符
Map.Entry entry = (Entry) ite.next();
if(entry.getValue() instanceof String[]){
String[] values = (String[]) entry.getValue();
for(int i = 0 ; i < values.length ; i++){
values[i] = StringFilter(values[i]);
}
entry.setValue(values);  //存进参数集合中
}
}

}

arg2.doFilter(arg0, arg1);	  //放行
}

@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub

}

public  String StringFilter(String   str){
String regEx="[`~!@#$%^&*()+=|{}':;',\\[\\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？\"\"]";
Pattern   p   =   Pattern.compile(regEx);
Matcher   m   =   p.matcher(str);
return   m.replaceAll("").trim();
}
}