zuul 和 gateway 原理分析

最新推荐文章于 2025-04-15 09:48:44 发布

lisin-lee-cooper

最新推荐文章于 2025-04-15 09:48:44 发布

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分类专栏： Interview SpringCloud 文章标签： java

本文链接：https://blog.youkuaiyun.com/weixin_47626220/article/details/123810077

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一. zuul 原理分析

zuulServlet 源码

public class ZuulServlet extends HttpServlet {
   
    
 	private ZuulRunner zuulRunner;
    
    public void init(ServletConfig config) throws ServletException {
   
        ...
    }
    public void service(javax.servlet.ServletRequest servletRequest, javax.servlet.ServletResponse servletResponse) throws ServletException, IOException {
   
        ...
    }
}

service 方法

try {
   
    init((HttpServletRequest) servletRequest, (HttpServletResponse) servletResponse);
 
    // Marks this request as having passed through the "Zuul engine", as opposed to servlets
    // explicitly bound in web.xml, for which requests will not have the same data attached
    RequestContext context = RequestContext.getCurrentContext();
    context.setZuulEngineRan();
 
    try {
   
        preRoute();
    } catch (ZuulException e) {
   
        error(e);
        postRoute();
        return;
    }
    try {
   
        route();
    } catch (ZuulException e) {
   
        error(e);
        postRoute();
        return;
    }
    try {
   
        postRoute();
    } catch (ZuulException e) {
   
        error(e);
        return;
    }
 
} catch (Throwable e) {
   
    error(new ZuulException(e, 500, "UNHANDLED_EXCEPTION_" + e.getClass().getName()));
} finally {
   
    RequestContext.getCurrentContext().unset();
}