get或post请求的中文乱码问题解决

增加一个过滤器对传过来的请求进行加强

package Test;

import java.io.IOException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class EncodingFilter implements Filter {

    public EncodingFilter() {
    }

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		//将Request对象转化为HttpServletRequest
		final HttpServletRequest req = (HttpServletRequest)request;
		HttpServletRequest myReq = (HttpServletRequest)Proxy.newProxyInstance(EncodingFilter.class.getClassLoader(), req.getClass().getInterfaces(), new InvocationHandler() {
			
			@Override
			public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
				Object obj = null;
				if(method.getName().equalsIgnoreCase("getParameter")) {
					//获取本次请求的方式
					String md = req.getMethod();
					if("post".equalsIgnoreCase(md)) {
						req.setCharacterEncoding("utf-8");
						obj = method.invoke(req, args);
					}else {
						//get方式请求
						//调用req对象上的getParameter的方法
						String v = (String)method.invoke(req, args);
						//转码
//						String vv = new String(v.getBytes("iso-8859-1"),"utf-8");
						return v;
					}
				}else {
					obj = method.invoke(req, args);
				}
				return obj;
			}
		});
		System.out.println(myReq.hashCode());
		//将代理对象放行
		chain.doFilter(myReq, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}