过滤器解决全站乱码

原创

渭城朝雨浥轻尘 2022-06-29 15:59:57 博主文章分类：java框架 ©著作权

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创建一个过滤器，设置请求访问编码

package com.hongyi.filter;

import java.io.IOException;

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;
/**
 * 解决全站乱码问题
 * @author 浪丶荡
 *
 */
public class CharacterEnCodingFilter implements Filter {


    public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        //对request/response进行预处理
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset-utf-8");

        MyCharacterEnCodingRequest requestWrapper = new MyCharacterEnCodingRequest(request);

        chain.doFilter(requestWrapper, response);
    }

    public void init(FilterConfig config) throws ServletException {

    }
    public void destroy() {

    }


}
class MyCharacterEnCodingRequest extends HttpServletRequestWrapper{

    private HttpServletRequest request;
    public MyCharacterEnCodingRequest(HttpServletRequest request) {
        super(request);
        this.request = request;
    }
    @Override
    public String getParameter(String name) {
        try {
            String value = this.request.getParameter(name);
            if(value==null){
                return null;
            }
            if(this.request.getMethod().equalsIgnoreCase("post")){
                return value;
            }else{
                value = new String(value.getBytes("utf-8"),this.request.getCharacterEncoding());
                return value;
            }

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }


}