# 58.3 自定义上下文路径

如果服务器的上下文路径没有配置为`/`，则云计算端点在应用程序的根上不可用。例如，如果配置为`server.servlet.context-path=/foo`, 则Cloud Foundry的端点位于`/foo/cloudfoundryapplication/*`。

如果你希望云计算端点始终在`/cloudfoundryapplication/*`上可用，无论服务器的上下文路径如何，你都需要在应用程序中显式地配置它。配置将根据使用的web服务器而有所不同。对于Tomcat，可以添加以下配置：

```java
@Bean
public TomcatServletWebServerFactory servletWebServerFactory() {
    return new TomcatServletWebServerFactory() {

        @Override
        protected void prepareContext(Host host,
                ServletContextInitializer[] initializers) {
            super.prepareContext(host, initializers);
            StandardContext child = new StandardContext();
            child.addLifecycleListener(new Tomcat.FixContextListener());
            child.setPath("/cloudfoundryapplication");
            ServletContainerInitializer initializer = getServletContextInitializer(
                    getContextPath());
            child.addServletContainerInitializer(initializer, Collections.emptySet());
            child.setCrossContext(true);
            host.addChild(child);
        }

    };
}

private ServletContainerInitializer getServletContextInitializer(String contextPath) {
    return (c, context) -> {
        Servlet servlet = new GenericServlet() {

            @Override
            public void service(ServletRequest req, ServletResponse res)
                    throws ServletException, IOException {
                ServletContext context = req.getServletContext()
                        .getContext(contextPath);
                context.getRequestDispatcher("/cloudfoundryapplication").forward(req,
                        res);
            }

        };
        context.addServlet("cloudfoundry", servlet).addMapping("/*");
    };
}
```