(资料图片)

spring boot过滤器实现项目内接口过滤业务

由于业务需求,存在两套项目,一套是路由中心,一套是业务系统.现在存在问题是,路由中心集成了微信公众号与小程序模块功能,业务系统部署了多套服务.现在需要通过调用路由中心将接口重新路由到指定的业务系统中

需要处理的问题将小程序,公众号用户信息与业务系统做绑定将路由中心的接口与业务系统的接口判断出来通过用户信息找到的业务系统服务,分发到对应的业务系统中公众号用户信息与业务系统做绑定处理步骤业务系统存在手机号,如果用户注册将手机号发送给路由中心记录将路由中心的接口与业务系统的接口判断处理步骤获取路由中心系统中接口映射

private static List URLS = new ArrayList<>();    @Resource    private WebApplicationContext applicationContext;    @Override    public void init(FilterConfig filterConfig) throws ServletException {        applicationContext.getBean(RequestMappingHandlerMapping.class).getHandlerMethods().forEach((k, v) -> { k.getPatternsCondition().getPatterns().stream().forEach(s-> URLS.add(s)); });        log.info("过滤器初始化");    }

获取请求接口路径

HttpServletRequest request = (HttpServletRequest) servletRequest;        HttpServletResponse response = (HttpServletResponse) servletResponse;        String requestName = request.getRequestURI();

判断是否是路由中心的接口

if (URLS.contains(requestName)) {//系统接口            chain.doFilter(servletRequest, servletResponse);        } else {//业务系统接口 需要代理//            代理请求            ResponseEntity redirect = routerService.redirect(request, response, "xxx", "xxx");            //设置将字符以"UTF-8"编码输出到客户端浏览器            response.setCharacterEncoding("UTF-8");            //通过设置响应头控制浏览器以UTF-8的编码显示数据，如果不加这句话，那么浏览器显示的将是乱码            response.setHeader("content-type", "application/json; charset=utf-8");            response.getWriter().write(redirect.getBody());        }

全部代码

import com.jyw.router.miniapp.service.IRouterService;import lombok.extern.slf4j.Slf4j;import org.springframework.context.annotation.Configuration;import org.springframework.http.ResponseEntity;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;import javax.annotation.Resource;import javax.servlet.*;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.ArrayList;import java.util.List;/** * @author 沈峻 * @ClassName RouterFilter * @Description TODO * @Date 2023/4/20 12:23 **/@Configuration@WebFilter(urlPatterns = "/*", filterName = "Router")@Slf4jpublic class RouterFilter implements Filter {    private static List URLS = new ArrayList<>();    @Resource    private WebApplicationContext applicationContext;    @Resource    private IRouterService routerService;    @Override    public void init(FilterConfig filterConfig) throws ServletException {        applicationContext.getBean(RequestMappingHandlerMapping.class).getHandlerMethods().forEach((k, v) -> { k.getPatternsCondition().getPatterns().stream().forEach(s-> URLS.add(s)); });        log.info("过滤器初始化");    }    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {        HttpServletRequest request = (HttpServletRequest) servletRequest;        HttpServletResponse response = (HttpServletResponse) servletResponse;        String requestName = request.getRequestURI();        /*顺手解决跨域问题*/        response.setHeader("Access-Control-Allow-Origin", "*");        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");        response.setHeader("Access-Control-Max-Age", "3600");        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");        log.info(requestName);        if (URLS.contains(requestName)) {            chain.doFilter(servletRequest, servletResponse);        } else {//            代理请求            ResponseEntity redirect = routerService.redirect(request, response, "http://192.168.2.18/api", "/router");            //设置将字符以"UTF-8"编码输出到客户端浏览器            response.setCharacterEncoding("UTF-8");            //通过设置响应头控制浏览器以UTF-8的编码显示数据，如果不加这句话，那么浏览器显示的将是乱码            response.setHeader("content-type", "application/json; charset=utf-8");            response.getWriter().write(redirect.getBody());        }        log.info("--------------------------------------------------------");    }    @Override    public void destroy() {        Filter.super.destroy();    }

代理转发实现

https://www.cnblogs.com/shenjun980326/p/spring-boot-route.html