一、创建过滤器类并实现Filter接口

 
import javax.servlet.Filter;
 
public class EncodingFilter implements Filter {
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二、通过WebFilter注解配置过滤器拦截一切请求

@WebFilter({"/*"}) //过滤一切请求
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三、在doFilter方法中统一设置编码方式并将请求放行

HttpServletRequest req = (HttpServletRequest) servletRequest;
HttpServletResponse resp = (HttpServletResponse) servletResponse;
//设置编码集，解决中文乱码问题
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
resp.setContentType("application/json;charset=utf8");
 
filterChain.doFilter(servletRequest, servletResponse); //请求放行
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四、完整源代码

package filter;
 
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
@WebFilter({"/*"}) //过滤一切请求
public class EncodingFilter implements Filter {
 
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("进过滤器了");
 
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        //设置编码集，解决中文乱码问题
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("application/json;charset=utf8");
 
        filterChain.doFilter(servletRequest, servletResponse); //请求放行
    }
 
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    public void destroy() {
 
    }
}

作者：大坏蛋_
链接：juejin.cn/post/716468…
来源：稀土掘金
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