Jetty：Servlet无法转发到JSP [英] Jetty: Servlet can't forward to JSP

问题描述

我有以下问题：我正在尝试将请求从servlet转发到jsp页面，但是我得到了404.当我直接访问/sites/home.jsp时，它会加载jsp。

I have the following problem: I'm trying to forward the request from the servlet to the jsp page, but I get an 404. When I´m accessing /sites/home.jsp directly, it loads the jsp.

    WebAppContext sites = new WebAppContext("src/com/example/blub/server/sites", "/sites");
    ServletContextHandler weblet = new ServletContextHandler(ServletContextHandler.SESSIONS);
    weblet.setContextPath("/");
    weblet.addServlet(new ServletHolder(new Weblet()), "/home");
    HandlerList handlers = new HandlerList();
    handlers.setHandlers(new Handler[] {sites, weblet});
    server.setHandler(handlers);

。

public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    req.getRequestDispatcher("/sites/home.jsp").forward(req, resp);
}

推荐答案

这个问题经常出现，所以我创建了一个使用嵌入式Jetty并启用JSP的示例项目。

This question comes up often enough, so I created an example project of using Embedded Jetty with JSP enabled.

https://github.com/jetty-project/embedded-jetty-jsp/

加载此项投射到你最喜欢的IDE。

Load up this project into your favorite IDE.

运行 org.eclipse.jetty.demo.Main 类，然后使用你的浏览器并打开 http：// localhost：8080 /

Run the org.eclipse.jetty.demo.Main class and then use your browser and open http://localhost:8080/

快速浏览

src / main / java / org / eclipse / jetty / demo / Main.java 包含创建/配置/启动嵌入式服务器的部分。

src/main/java/org/eclipse/jetty/demo/Main.java contains the part that creates / configures / and starts the embedded server.

特别注意：

• JspServlet必须命名为jsp - 参见 jspServletHolder（）


• org.eclipse.jetty.containerInitializers 需要为JSP初始化程序设置


• 需要添加 ServletContainerInitializersStarter bean


• 需要添加 InstanceManager 引用


• 正确的 javax.servlet.context.tempdir 需要创建


• 将 org.apache.jasper.compiler.disablejsr199 设置为 false 使用标准JavaC编译器


• Context的类加载器不能是系统类加载器。 - 参见 getUrlClassLoader（）


• DefaultServlet必须命名为default - 参见 defaultServletHolder（）

• The JspServlet must be named "jsp" - see jspServletHolder()
• The org.eclipse.jetty.containerInitializers needs to be setup for the JSP initializers
• The ServletContainerInitializersStarter bean needs to be added
• The InstanceManager reference needs to be added
• A proper javax.servlet.context.tempdir needs to be created
• Set org.apache.jasper.compiler.disablejsr199 to false to use the standard JavaC compiler
• The Classloader for the Context must not be a System Classloader. - see getUrlClassLoader()
• The DefaultServlet must be named "default" - see defaultServletHolder()

src / main / java / com / acme / DateServlet.java 是如何从Servlet转发到JSP的示例。

src/main/java/com/acme/DateServlet.java is an example of how to forward to a JSP from a Servlet.

DateServlet是映射到<$ c的路径规范Main.java中的$ c> / date /

The DateServlet is mapped to path spec of /date/ in Main.java

所以一旦你点击 http：// localhost：8080 / date / 请求将命中servlet，而servlet又转发到 /test/tag2.jsp

So once you hit http://localhost:8080/date/ the request will hit the servlet, which in turn forwards to to /test/tag2.jsp

这篇关于Jetty：Servlet无法转发到JSP的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！