Jetty 7.6 不编译 JSP 个文件

Question

我是 Jetty 和 JSP 的新手。我现在正在尝试使用嵌入式 Jetty 和 JSP 为 html 生成器创建简单的服务器。

我首先要提到的是，我受 Jetty 版本的限制。我必须使用的版本是 Jetty 7.6.x.x。

我需要创建几个 servlet，我可以在其中将 request/response 分派到 JSP 文件。问题是 JSP 文件似乎没有被编译，而不是评估表达式，它在浏览器中将整个脚本作为纯文本抛出。一起来看看吧

public void start() throws Exception {
    server = new Server();
    SelectChannelConnector connector = new SelectChannelConnector();
    connector.setPort(port);
    server.addConnector(connector);

    // Base URI to webapp, where jsp files are located
    URI baseUri = getWebRootResourceUri();

    // Create Servlet context
    ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
    context.setContextPath("/");
    context.setResourceBase(baseUri.toASCIIString());

    // Default Servlet (always last, always named "default")
    ServletHolder holderDefault = new ServletHolder("default", DefaultServlet.class);
    holderDefault.setInitParameter("resourceBase", baseUri.toASCIIString());
    holderDefault.setInitParameter("dirAllowed", "true");
    context.addServlet(holderDefault, "/");
    server.setHandler(context);

    server.start();

}

这是 JSP 文件

    <!DOCTYPE html>
<html>
    <head>
        <title>Coin Flipper</title>
    </head>
    <body>
        <h1>Coin Flipper</h1>
        <p>Flipping a coin...</p>
        <% if(Math.random() < .5){ %>
            <p>Heads!</p>
        <% }
        else{ %>
            <p>Tails!</p>
        <% } %>
        <hr />
        <p>Refresh to flip again.</p>
    </body>
</html>

这是结果：

我没有使用 web.xml，但如果它能解决我的问题，我不介意使用它。

这也是我的 Maven 依赖项：

<dependencies>
        <!-- Embedded web server -->
        <!-- https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-server -->
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
            <version>7.6.21.v20160908</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-servlet -->
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-servlet</artifactId>
            <version>7.6.21.v20160908</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.glassfish.web/jsp-impl -->
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>jsp-impl</artifactId>
            <version>2.1.3-b10</version>
        </dependency>

    </dependencies>

Answer 1

来自https://wiki.eclipse.org/Jetty/Howto/Configure_JSP

In versions of Jetty prior to 7.5.0, the JSP infrastructure made use of the Eclipse Java Compiler (ecj.jar) which is supplied in $JETTY_HOME/lib/jsp. For jetty-7.5.0 we upgraded the version of JSP to jsp-impl-2.1.3.b10 (from Glassfish). In this version, the JSP infrastructure ALWAYS tries to acquire a Java compiler from the JVM if the version of Java is 1.6 or above. Therefore, if you are using a JRE, JSPs are unable to compile so you must use a full JDK. Alternatively, you can precompile your JSPs (which is preferable in a production deployment in any case). The Jetty JSPC Maven Plugin is helpful for precompilation.

这听起来很像你的问题。按照上面 link 的指示，使用 JDK 或预编译您的 JSP。

Jetty 7.6 不编译 JSP 个文件

Jetty 7.6 does not compile JSP files

java

maven

jsp

embedded-jetty

end-of-life