首先很坑爹是竟然导不了javax.servlet.*包，如果你没遇到了这样的问题，那么请跳过第一步
1、导入servlet-api.jar包：找到Tomcat安装目录下lib中的servlet-api.jar包，将其复制到Web项目根目录lib下(lib文件夹需创建)，配置Gradle文件
servlet-api.jar所在目录.png
Web项目新建lib文件夹，将servlet-api.jar复制进去.png
配置Gradle文件.png
2、新建MyFilter类，并配置web.xml文件
import javax.servlet.*;
import java.io.IOException;
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
servletRequest.setCharacterEncoding("utf-8");
servletResponse.setCharacterEncoding("utf-8");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}
<servlet>
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</servlet>
3、运行项目，检验结果
结果.png
