Question

我试图在Jersey / Spring应用程序中获取属性以注入成员变量，如下所示。当我在localhost：8080 / test / test上调用该服务时，String只是为null。我在容器启动时也没有收到任何错误。一切看起来都像预期的那样在类路径上得到解决。

我下面做错了什么吗？我可以提供更多信息来帮助排除故障吗？

Tester.java：

package com.foo;

@Service
@Path("/test")
public class Tester implements Serializable {

    private static final long serialVersionUID = 7192266167739106825L;

    @Value("${testInjection}")
    private String throttleTime;

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    @Path("/test")
    public String test() {
        return "injected value: " + throttleTime;
    }
}

弹簧-config.xml中

  <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:tx="http://www.springframework.org/schema/tx"
   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<context:annotation-config />
<context:component-scan base-package="com.foo"/>

<!-- Property Loader Configuration -->
<context:property-placeholder location="classpath:Test.properties"/>
<tx:annotation-driven/>

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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>Test</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>Test</name>
<url>http://maven.apache.org</url>

<properties>
    <spring.version>4.0.2.RELEASE</spring.version>
    <hibernate.version>4.3.4.Final</hibernate.version>
    <jersey.version>2.7</jersey.version>
</properties>

<dependencies>
    <!-- Spring stuff -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- Hibernate stuff -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate.version}</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>${hibernate.version}</version>
    </dependency>

    <!-- Jersey stuff -->
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <!-- if Servlet API older than 3.0, use "jersey-container-servlet-core"  -->
        <artifactId>jersey-container-servlet</artifactId>
        <version>${jersey.version}</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.ext</groupId>
        <artifactId>jersey-spring3</artifactId>
        <version>${jersey.version}</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
        <version>2.7</version>
    </dependency>

    <!-- Testing stuff -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>${spring.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.0.13</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.26</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.0.2</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>

Test.properties：

testInjection="itworks"

**某些输出**

INFO: Refreshing Root WebApplicationContext: startup date [Thu Mar 27 13:04:37 EDT 2014]; root of context hierarchy
Mar 27, 2014 1:04:37 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring-config.xml]
Mar 27, 2014 1:04:37 PM org.springframework.context.support.PropertySourcesPlaceholderConfigurer loadProperties
INFO: Loading properties file from class path resource [Test.properties]
Mar 27, 2014 1:04:37 PM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
INFO: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
Mar 27, 2014 1:04:37 PM org.springframework.jdbc.datasource.DriverManagerDataSource setDriverClassName

Answer 1

我还必须添加@Component注释..

package com.foo;

@Component
@Service
@Path("/test")
public class Tester implements Serializable {

    private static final long serialVersionUID = 7192266167739106825L;

    @Value("${testInjection}")
    private String throttleTime;

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    @Path("/test")
    public String test() {
        return "injected value: " + throttleTime;
    }
}

@Value在Spring / Jersey App中返回Null

1 个答案: