动态代理模式方法

实践代码

public class EncodingFilter implements Filter{
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(FilterConfig filterConfig) throws IOException,ServletException {
final HttpServletRequest request = (HttpServletRequest) req;
HttpServletRequest requesrProxy = (HttpServletRequest)Proxy.newProxyInstance(EncodingFilter.class.getclassLoader(),new Class[]{HttpServletRequest.class},new InvocationHandler(){@Overridepublic Object invoke(Object proxy,Method method,Object[] args) throws Throwable{//对特定方法可以增强 比如get 也可以全部过滤if("get".equals(request.getMethod())){String value = (String) method.invoke(request,args);return new String(value.getBytes("UTF-8"),"UTF-8");}}return method.invoke(request,args);}});chain.doFilter(requestProxy,response);}@Overridepublic void destroy(){}}