自定义jsp标记未调用

Question

I'm trying to write custom jsp tag. 我正在尝试编写自定义jsp标记。 But my tag is not invoked. 但是我的标签没有被调用。 Instead I got response in plain text with my html and jsp tags(maybe browser doesn't parse it as html because of jsp tags). 相反，我得到了带有html和jsp标签的纯文本响应（也许由于jsp标签，浏览器无法将其解析为html）。 My tld file is in the right place(/WEB-INF/custom.tld) and I have no errors or exceptions in console and I got no clue what is wrong with my tag. 我的tld文件位于正确的位置（/WEB-INF/custom.tld），我在控制台中没有错误或异常，并且我不知道我的标签有什么问题。 Probably it's because of some jsp dependencies or deployment descriptors. 可能是由于某些jsp依赖项或部署描述符所致。 I'm using tomcat 7. My code: 我正在使用tomcat7。我的代码：

web.xml web.xml中

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    <display-name>Spring MVC Application</display-name>

    <servlet>
        <servlet-name>HelloWeb</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloWeb</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

</web-app>

pom.xml 的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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.test</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>
</project>

custom.tld custom.tld

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
        version="2.0">
    <tlib-version>1.0</tlib-version>
    <short-name>Test</short-name>
    <tag>
        <name>greet</name>
        <tag-class>com.test.tag.HelloTag</tag-class>
        <body-content>empty</body-content>
    </tag>
</taglib>

hello.jsp 为hello.jsp

<%@ taglib prefix="ex" uri="/WEB-INF/custom.tld"%>
<html>
<head>
    <title></title>
</head>
<body>
<ex:greet/>
</body>
</html>

Tag 标签

package com.test.tag;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;

public class HelloTag extends SimpleTagSupport {

    @Override
    public void doTag() throws JspException, IOException {
        getJspContext().getOut().println("Hello!");
    }
}

And my response looks exactly like this: 我的回应看起来像这样：

<%@ taglib prefix="ex" uri="/WEB-INF/custom.tld"%>
<html>
<head>
    <title></title>
</head>
<body>
<ex:greet/>
</body>
</html>

Could you please tell me what am I doing wrong? 你能告诉我我在做什么错吗？

Answer 1

For servlet url mapping, you have to use <url-pattern>/</url-pattern> instead of <url-pattern>/*</url-pattern> , because /* overrides the default JspServlet mapping. 对于servlet url映射，必须使用<url-pattern>/</url-pattern>而不是<url-pattern>/*</url-pattern> ，因为/*会覆盖默认的JspServlet映射。 You can find more details about difference between / and /* at this answer 您可以在此答案中找到有关/和/*之间差异的更多详细信息

自定义jsp标记未调用

问题描述

1 个解决方案

解决方案1
1 已采纳 2015-06-04 08:36:52

自定义jsp标记未调用

问题描述

1 个解决方案

解决方案1 1 已采纳 2015-06-04 08:36:52

解决方案1
1 已采纳 2015-06-04 08:36:52