Java JSF和Maven是一个简单的例子。无法将托管bean消息打印到xhtml_Java_Jsf

Java JSF和Maven是一个简单的例子。无法将托管bean消息打印到xhtml

java jsf

Java JSF和Maven是一个简单的例子。无法将托管bean消息打印到xhtml,java,jsf,Java,Jsf,我是JSF新手，我正在尝试做一个基本练习：在xhtml文件上打印ManagedBean消息。我搜索了一些可以帮助我的信息，但没有运气以下是我的文件的外观： EngineController.java（我的托管bean所在的位置） home.xhtml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:

我是JSF新手，我正在尝试做一个基本练习：在xhtml文件上打印ManagedBean消息。我搜索了一些可以帮助我的信息，但没有运气

以下是我的文件的外观：

EngineController.java（我的托管bean所在的位置）

home.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html">

    <h:head>
        <title>Primera Practica</title>
    </h:head>
    <h:body>
        <h:form>
            <h2>Motor</h2>
            <h:outputText value="#{engineController.msgTurnOnBtn}" />
            <h:commandButton id="turnOnBtn" 
                             value="#{engineController.msgTurnOnBtn}"
                             >
            </h:commandButton>
        </h:form>
    </h:body>
</html>

<?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/javaee"
         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         id="WebApp_ID" version="2.5">

    <display-name>Practica1</display-name>

    <!-- Change to "Production" when you are ready to deploy -->
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>

    <!-- Welcome page -->
    <welcome-file-list>
        <welcome-file>faces/home.xhtml</welcome-file>
    </welcome-file-list>

    <!-- JSF mapping -->
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Map these files with JSF -->
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mycompany</groupId>
    <artifactId>Practica1</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Practica1 Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.1.7</version>
            <type>jar</type>
        </dependency>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.1.7</version>
        </dependency>

        <!-- Tomcat 6 need this -->
        <dependency>
            <groupId>com.sun.el</groupId>
            <artifactId>el-ri</artifactId>
            <version>1.0</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>Practica1</finalName>

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.1</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>


实习小学
发动机

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html">

    <h:head>
        <title>Primera Practica</title>
    </h:head>
    <h:body>
        <h:form>
            <h2>Motor</h2>
            <h:outputText value="#{engineController.msgTurnOnBtn}" />
            <h:commandButton id="turnOnBtn" 
                             value="#{engineController.msgTurnOnBtn}"
                             >
            </h:commandButton>
        </h:form>
    </h:body>
</html>

<?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/javaee"
         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         id="WebApp_ID" version="2.5">

    <display-name>Practica1</display-name>

    <!-- Change to "Production" when you are ready to deploy -->
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>

    <!-- Welcome page -->
    <welcome-file-list>
        <welcome-file>faces/home.xhtml</welcome-file>
    </welcome-file-list>

    <!-- JSF mapping -->
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Map these files with JSF -->
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mycompany</groupId>
    <artifactId>Practica1</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Practica1 Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.1.7</version>
            <type>jar</type>
        </dependency>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.1.7</version>
        </dependency>

        <!-- Tomcat 6 need this -->
        <dependency>
            <groupId>com.sun.el</groupId>
            <artifactId>el-ri</artifactId>
            <version>1.0</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>Practica1</finalName>

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.1</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>


实践1
javax.faces.PROJECT_阶段
发展
faces/home.xhtml
Facesservlet
javax.faces.webapp.FacesServlet
1.
Facesservlet
/面孔/*
Facesservlet
*.jsf
Facesservlet
*.面孔
Facesservlet
*.xhtml

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html">

    <h:head>
        <title>Primera Practica</title>
    </h:head>
    <h:body>
        <h:form>
            <h2>Motor</h2>
            <h:outputText value="#{engineController.msgTurnOnBtn}" />
            <h:commandButton id="turnOnBtn" 
                             value="#{engineController.msgTurnOnBtn}"
                             >
            </h:commandButton>
        </h:form>
    </h:body>
</html>

<?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/javaee"
         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         id="WebApp_ID" version="2.5">

    <display-name>Practica1</display-name>

    <!-- Change to "Production" when you are ready to deploy -->
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>

    <!-- Welcome page -->
    <welcome-file-list>
        <welcome-file>faces/home.xhtml</welcome-file>
    </welcome-file-list>

    <!-- JSF mapping -->
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Map these files with JSF -->
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.faces</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
    </servlet-mapping>
</web-app>

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mycompany</groupId>
    <artifactId>Practica1</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Practica1 Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.1.7</version>
            <type>jar</type>
        </dependency>

        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.1.7</version>
        </dependency>

        <!-- Tomcat 6 need this -->
        <dependency>
            <groupId>com.sun.el</groupId>
            <artifactId>el-ri</artifactId>
            <version>1.0</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>Practica1</finalName>

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.1</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>


4.0.0
com.mycompany
实践1
战争
1.0-快照
Practica1 Maven网络应用程序
http://maven.apache.org
朱尼特
朱尼特
3.8.1
测试
com.sun.faces
JSFAPI
2.1.7
罐子
com.sun.faces
jsf impl
2.1.7
com.sun.el
埃尔里
1
实践1
org.apache.maven.plugins
maven编译器插件
2.3.1
1.6
1.6

所以问题是，我在home.xhtml文件的#{engineController.msgTurnOnBtn}中看不到消息

顺便说一句，我的一位同事实现了另一个代码，它看起来和我一样，我可以毫无问题地执行

提前谢谢，伙计们：）

将包的名称更改为“java”以外的名称
不要将@ManagedProperty（value=“#{msgTurnOnBtn}”）放在字符串属性上

您在浏览器中看到了什么？只是一张白纸？如果是这样，当你做一个“查看源代码”时，你在那里看到了什么？你看到html了吗？或者你看到了home.xhtml中的文本xhtml代码了吗？这是一个很好的教程，对我来说很有用：顺便说一句：你不需要字符串属性上的@ManagedProperty（value=“#{msgTurnOnBtn}”）。@Gimby我看到的只是标题（h2）'Motor'，下面是commandButton，没有文本（我的消息来自托管Bean）。图片：谢谢！现在它起作用了。原因是@ManagedProperty（value=“#{msgTurnOnBtn}”）。有了它就没用了，没有了它就没用了。我真的不知道为什么，但就是这样。我猜这与java版本有关（我的版本是1.8.0_25）。@FLBKernel您可以花点时间阅读ManagedProperty的用途。只是一个想法，但通常你猜错了。特别是当你的第一个猜测是归咎于工具时。@FBLKernel:对于包名“java”，我得到了一个java.lang.ClassNotFoundException:java.EngineController，不知道为什么这对你有用you@RaphaelRoth我将名称更改为另一个名称，但仍然遇到相同的问题，因此我认为问题在于ManagedProperty，而不是包的名称。我一直在想为什么。我认为ManagedProperty是访问该属性并获取其值所必需的。@FBLKernel:但是“字符串”不是由容器“管理”的。如果要将其他托管Bean（如JSF或Springbean）注入到JSF托管Bean中，则需要ManagedProperty