Question

使用Embedded Jetty我试图在servlet doGet（）执行后获得一个非常简单的servlet转发到JSP页面。然而，它不是到达JSP而是简单地递归转发到调用转发的同一个doGet（）。

我对这个东西很新，但它喜欢它或者无法找到JSP而是映射到它可以找到的唯一的servlet，否则我没有注册JSP或其他东西。请帮忙。

我的代码如下......

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

public class RunHelloServlet {

public static void main(String[] args) throws Exception {
    Server server = new Server(8080);

    ServletContextHandler contextHandler = new ServletContextHandler(ServletContextHandler.SESSIONS);
    contextHandler.setContextPath("/");
    server.setHandler(contextHandler);

    contextHandler.addServlet(new ServletHolder(new HelloServlet()), "/*");
    server.start();
    server.join();
}

public static class HelloServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public HelloServlet() {
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String par1 = request.getParameter("par1");
        request.setAttribute("key", par1);
        try {
            request.getRequestDispatcher("/result.jsp").forward(request, response);
        }
        catch (ServletException e1) {
            e1.printStackTrace();
        }

    }
}
}

我的JSP位于。\ src \ main \ webapp \ WEB-INF \ result.jsp

<%@ page language="javascript" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"     "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>

</body>
</html>

我的pom.xml ......

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.hp.it.kmcs.search</groupId>
  <artifactId>JettyTest</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>JettyTest</name>
  <url>http://maven.apache.org</url>

 <properties>
    <jettyVersion>7.2.0.v20101020</jettyVersion>
  </properties>

  <dependencies>
    <dependency>
        <groupId>org.eclipse.jetty.aggregate</groupId>
        <artifactId>jetty-all-server</artifactId>
        <version>7.6.0.RC1</version>
        <type>jar</type>
        <scope>compile</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <!-- This plugin is needed for the servlet example -->
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>jetty-maven-plugin</artifactId>
        <version>${jettyVersion}</version>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.1</version>
        <executions>
          <execution><goals><goal>java</goal></goals></execution>
        </executions>
        <configuration>
          <mainClass>com.hp.it.kmcs.JettyTest.RunHelloServlet</mainClass>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

Answer 1

看起来您已映射HelloServlet，因此它几乎处理每个请求。当您尝试将请求从HelloServlet转发到/result.jsp时，Jetty会将路径/result.jsp与/*匹配，然后将请求转发回HelloServlet（其中将它转发到/result.jsp，依此递归）。

您应该使您的servlet映射更具限制性（例如/hello而不是/*）。

此外，由于您的.jsp文件位于WEB-INF中，因此您应该转发到/WEB-INF/result.jsp。

嵌入式Jetty转发servlet对JSP的响应

1 个答案: