Filter处理中文乱码

开发过虑器

publicclass CharFilterimplements Filter {

    private Stringencoding;

    publicvoid init(FilterConfig conf)throws ServletException {

       this.encoding=conf.getInitParameter("bmgs");

    }

    publicvoid doFilter(ServletRequest request, ServletResponseresponse, FilterChain chain)throws IOException, ServletException {

       //1:设置请求的编码,以下是支持post

       request.setCharacterEncoding(encoding);

       //2:同时也设置响应的编码

       response.setContentType("text/html;charset="+encoding);

         MyRequest req = new MyRequest((HttpServletRequest)request);

       chain.doFilter(req, response);

    }

    publicvoid destroy() {

    }

}

上面的代码还可以优化，即当GET请求时包装，是POST就不用包装

publicvoid doFilter(ServletRequest request, ServletResponseresponse, FilterChain chain)throws IOException, ServletException {

       //1:设置请求的编码,以下是支持post

       request.setCharacterEncoding(encoding);

       //2:同时也设置响应的编码

       response.setContentType("text/html;charset="+encoding);

       HttpServletRequest  req = (HttpServletRequest)request;

       if(req.getMethod().equalsIgnoreCase("GET")){

              request = new MyRequest(request);

        }

       chain.doFilter(req, response);

    }

 

同时也让它可以处理get的乱码

    思想：包装request

 

//wrapper

class MyRequestextends HttpServletRequestWrapper{

    public MyRequest(HttpServletRequest request) {

       super(request);

    }

    @Override

    public String getParameter(String name) {

       String val = super.getParameter(name);

       if(val!=null){

           try {

              val = new String(val.getBytes("ISO-8859-1"),super.getCharacterEncoding());

           } catch (UnsupportedEncodingException e) {

              e.printStackTrace();

           }

       }

       return val;

    }

}