Spring Boot 过滤器实现项目内接口过滤
作者：Java你猿哥
- 2023-04-21 湖南
本文字数：2366 字
阅读完需：约 8 分钟
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<String> 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"); }复制代码
获取请求接口路径
HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; String requestName = request.getRequestURI();复制代码
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<String> 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()); }复制代码
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<String> 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<String> 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(); }复制代码
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