过滤器，拦截中文乱码

package com.chenxb;

import javax.servlet.*;
import java.io.IOException;

public class Filter implements javax.servlet.Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("初始化。。。");
    }

    //过滤所有代码（注意：最后必须让过滤器继续运行）
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletResponse.setCharacterEncoding("utf-8");
        System.out.println("执行前。。。");
        filterChain.doFilter(servletRequest, servletResponse);
        System.out.println("执行后。。。");
    }

    @Override
    public void destroy() {
        System.out.println("销毁。。。");
    }
}

调取测试

package com.chenxb;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class FilterTest extends ServletContextSet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer = resp.getWriter();
        writer.print("通过过滤器修复中文乱码");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

web.xml配置

<!--过滤器mapping-->
    <filter>
        <filter-name>Filter</filter-name>
        <filter-class>com.chenxb.Filter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>Filter</filter-name>
        <!--/filter/的所有请求都被过滤-->
        <url-pattern>/Filter/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>FilterTest</servlet-name>
        <servlet-class>com.chenxb.FilterTest</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>FilterTest</servlet-name>
        <!--没有过滤器的地址-->
        <url-pattern>/FilterTest</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>FilterTest</servlet-name>
        <!--有过滤器的地址-->
        <url-pattern>/Filter/FilterTest</url-pattern>
    </servlet-mapping>