使用Filter解决全站乱码

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神器Filter过滤器.

package cn.xingkong.filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

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.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

public class CharacterEncodingFilter2 implements Filter {

    private String charset;
    private String defaultCharset = "UTF-8";

    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {
        if (charset == null) {
            charset = defaultCharset;
        }
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        request.setCharacterEncoding(charset);
        response.setCharacterEncoding(charset);
        response.setContentType("text/html;charset=" + charset);
        // 以上只能解决request的post请求的乱码问题
        chain.doFilter(new MyRequest(request), response);
    }

    class MyRequest extends HttpServletRequestWrapper {

        HttpServletRequest request;

        public MyRequest(HttpServletRequest request) {
            super(request);
            this.request = request;
        }

        @Override
        public String getParameter(String name) {
            String value = request.getParameter(name);
            if (request.getMethod().equals("post")) {
                return value;
            }
            if (value == null) {
                return null;
            }
            try {
                return value = new String(value.getBytes("iso8850-1"),
                        request.getCharacterEncoding());
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException();
            }
        }

    }

    public void destroy() {
        // TODO Auto-generated method stub

    }

    public void init(FilterConfig filterConfig) throws ServletException {
        charset = filterConfig.getInitParameter("charset");
    }

}

web.xml中进行配置。

  <filter>
    <filter-name>CharacterEncodingFilter2</filter-name>
    <filter-class>cn.xingkong.filter.CharacterEncodingFilter2</filter-class>
    <init-param>
        <param-name>charset</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>CharacterEncodingFilter2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>