filter实现统一编码

如果使用get请求, 是不会乱码的, 而post有可能乱码, 可以使用filter设置统一编码

先 new 一个 class , 名称叫 EncodingFilter , 并拷贝如下代码

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 解决全站乱码问题，处理所有的请求
 */
@WebFilter("/*")
public class EncodingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse rep, FilterChain filterChain) throws IOException, ServletException {
        //将父接口转为子接口
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) rep;
        //获取请求方法
        String method = request.getMethod();
        //解决post请求中文数据乱码问题, get不会乱码
        if(method.equalsIgnoreCase("post")){
            request.setCharacterEncoding("utf-8");
        }
        //处理响应乱码, 仅设置响编码,而不是 setContentType
        response.setCharacterEncoding("utf-8");
        filterChain.doFilter(request,response);
    }

    @Override
    public void destroy() {

    }
}