利用动态代理解决网站乱码问题

新建一个Filter，配置设置为REQUEST或全局

代码如下：

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
	final HttpServletRequest req = (HttpServletRequest)request;
	
	HttpServletRequest myrequest = (HttpServletRequest) Proxy.newProxyInstance(EcodeingFilter.class.getClassLoader(), 
			req.getClass().getInterfaces(), new InvocationHandler() {
		
		@Override
		public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
			Object obj = null;
			if ("getParameter".equalsIgnoreCase(method.getName())) {
				String md = req.getMethod();
				if ("GET".equalsIgnoreCase(md)) {
					String v = (String) method.invoke(req, args);
					return new String(v.getBytes("iso-8859-1"), "UTF-8");
				}else if ("POST".equals(md)) {
					req.setCharacterEncoding("UTF-8");
					return method.invoke(req, args);
				}
			}else {//PUT
				return method.invoke(req, args);
			}
			return obj;
		}
	} );
	
	chain.doFilter(myrequest, response);
}