基于tomcat8 编写字符编码Filter过滤器无效问题的解决方法

同事遇到编码问题时想做一个解决全站的字符编码过滤器，过滤器类和配置如下：

过滤器类：

<span style="font-size:12px;">package com.chaoxing.newspaper.web.filter;

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;

import javax.servlet.http.HttpServletResponse;

public class CharacterEncodingFilter implements Filter {

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

System.out.println("过滤器执行");

final HttpServletRequest request = (HttpServletRequest) req;

HttpServletResponse response = (HttpServletResponse) res;

//解决post请求的中文乱码

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

response.setContentType("text/html;charset=UTF-8");

chain.doFilter((ServletRequest) Proxy.newProxyInstance(this.getClass().getClassLoader(), request.getClass().getInterfaces(), new InvocationHandler(){

@Override

public Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {

String methodname = method.getName(); //拿到当前的方法

if(methodname.equals("getParameter")){

//执行request.getparameter获取结果

String value = (String) method.invoke(request, args);

if(value==null){

return null;

}

if(!request.getMethod().equalsIgnoreCase("get")){ //判断是为get请求

return value;

}

System.out.println(value+"|||||");

//转换编码返回

value = new String(value.getBytes("UTF-8"),"UTF-8");

System.out.println(value+"=======");

return value;

}

//交给request执行请求

return method.invoke(request, args);

}

} ), res);

}

public void init(FilterConfig fConfig) throws ServletException {

System.out.println("过滤器初始化");

}

@Override

public void destroy() {

System.out.println("过滤器完成");

}

}</span>

过滤器配置：

基于tomcat8 编写字符编码Filter过滤器无效问题的解决方法

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