Question

我似乎无法在我的JSPX 2.1项目中使用Tomcat 8获取JSP自定义标签用于爱和金钱，使用Eclipse Java EE IDE for Web Developers 4.4.1，在Firefox 35.0.1 Windows 8.1中进行测试。

症状：没有错误消息，它们只是被传递而且标签没有被处理，因为我在其中用于调试的打印语句根本没有被执行。内置的JSTL标签可以毫不费力地工作。

将我的头撞在墙上一段时间之后，我继续前进并尝试了另一个自定义标签。这也没有用，同样的症状。

我尝试过的事情：我将我的代码与一本预先构建的示例Web项目进行了比较 - 本项目中的自定义标签被调用并正常执行，因此我怀疑这与项目配置有关 - 尽管我不知道，通过Eclipse中的属性页面拖网并没有显示任何明显的差异。我还比较了上述示例中的web.xml配置和.tld配置，调整它们的版本号和.xsd引用是相同的，如果这是问题。我已经看过类似的问题，他们特别关注在Maven中构建Tomcat 7的依赖关系，我已经专门检查了这些项目的依赖关系，并且相信它们是相同的。

.tld文件（在WEB-INF目录中）

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.1" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xml="http://www.w3.org/XML/1998/namespace" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_1.xsd ">
<description>Auctioneers custom tags</description>
<tlib-version>1.0</tlib-version>
<short-name>dauct</short-name>
<tag>
    <description>Create a user</description>
    <display-name>createUser</display-name>
    <name>createUser</name>
    <tag-class>derbyauct.users.UserInsertTag</tag-class>
    <body-content>empty</body-content>
    <attribute>
        <name>user</name>
        <rtexprvalue>true</rtexprvalue>
        <type>derbyauct.users.UserCreation</type>
    </attribute>
</tag>
<tag>
    <description>Returns auctions at status ready</description>
    <display-name>returnReadyAuctions</display-name>
    <name>returnReadyAuctions</name>
    <tag-class>derbyauct.auctions.NextAuctionTag</tag-class>
    <body-content>empty</body-content>
</tag>

的web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xmlns="http://java.sun.com/xml/ns/j2ee" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd" 
    id="WebApp_ID" 
    version="2.5">
      <display-name>auctioneers</display-name>
      <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
      <servlet>
        <description>
        </description>
            <display-name>AuctServlet</display-name>
            <servlet-name>AuctServlet</servlet-name>
            <servlet-class>auct.AuctServlet</servlet-class>
          <init-param>
        <param-name>base</param-name>
        <param-value>/dauct</param-value>
        </init-param>
      <init-param>
        <param-name>imageURL</param-name>
        <param-value>/images/</param-value>
        </init-param>
      <init-param>
        <param-name>jdbcDriver</param-name>
        <param-value>org.mariadb.jdbc.Driver</param-value>
        </init-param>
      <init-param>
        <param-name>dbURL</param-name>
        <param-value>jdbc:mysql://localhost:3306/derbyauct</param-value>
        </init-param>
      <init-param>
        <param-name>dbUserName</param-name>
        <param-value></param-value>
        </init-param>
      <init-param>
        <param-name>dbPassword</param-name>
        <param-value></param-value>
        </init-param>
      </servlet>
    <servlet-mapping>
        <servlet-name>AuctServlet</servlet-name>
        <url-pattern>/dauct/</url-pattern>
      </servlet-mapping>
    </web-app>

标记处理程序

package auct.users;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.ServletContext;

import auct.utils.DALManager;
import auct.users.UserCreation;

public class UserInsertTag extends TagSupport {

    static final long serialVersionUID = 1L;
    private UserCreation user;

    public UserCreation getUser() {
        return user;
    }

    public void setUser(UserCreation user) {
        this.user = user;
        System.out.println("user object :" + user);
    }

    public int doEndTag() throws JspException {
        ServletContext context = pageContext.getServletContext();
        DALManager dm = (DALManager)context.getAttribute("dalManager");
        try {
            dm.insertUser(user);
        }
        catch (Exception e) {}
        return EVAL_PAGE;
    }
}

JSPX文件调用标记

<?xml version="1.0" encoding="ISO-8859-1" ?>
<jsp:root 
    xmlns:jsp="http://java.sun.com/JSP/Page"
    xmlns:dauct="urn:jspltd:/WEB-INF/tlds/dauct.tld"
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    version="2.3"
>
<jsp:directive.page 
    language="java"
    contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" />
<jsp:text>
    <![CDATA[ <?xml version="1.0" encoding="ISO-8859-1" ?> ]]>
    </jsp:text>
    <jsp:text>
        <![CDATA[ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> ]]>
    </jsp:text>
<c:url var="cssUrl" value="/css/dauct.jspx"/>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>User</title>
  <link rel="stylesheet" href="${cssUrl}" type="text/css"/>
  </head>
<body>
<jsp:include page="TopMenu.jspx" flush="true"/>
<jsp:include page="LeftMenu.jspx" flush="true"/>
<div class="content">
  <h2>Registration Complete</h2>
  <jsp:useBean id="user" class="auct.users.UserCreation" scope="request"/>
  <jsp:setProperty property="*" name="user"/>
 <dauct:createUser user="${user}"/>
      <p class="info">
        Thank you for registering.<br/>
        Welcome to Auctioneers <c:out value="${user.firstName}"/>
        </p>
  </div>
</body>
</html>
</jsp:root>

lib文件夹

annotations-api.jar
catalina-ant.jar
catalina-ha.jar
catalina-storeconfig.jar
catalina-tribes.jar
catalina.jar
ecj-4.4.jar
el-api.jar
jasper-el.jar
jasper.jar
javax.servlet.jsp.jstl-1.2.1.jar
javax.servlet.jsp.jstl-api-1.2.1.jar
jsp-api.jar
list.txt
mariadb-java-client-1.1.8.jar
mysql-connector-java-5.1.34-bin.jar
servlet-api.jar
tomcat-api.jar
tomcat-coyote.jar
tomcat-dbcp.jar
tomcat-i18n-es.jar
tomcat-i18n-fr.jar
tomcat-i18n-ja.jar
tomcat-jdbc.jar
tomcat-jni.jar
tomcat-spdy.jar
tomcat-util-scan.jar
tomcat-util.jar
tomcat-websocket.jar
websocket-api.jar

Answer 1

尝试使用指令taglib <%@taglib prefix="c" uri=""%>

将您的标记导入JSP文件

JSP自定义标记在Tomcat 8.0中不起作用

1 个答案: