春天@Autowired不工作（不总是） [英] Spring @Autowired not working (not always)

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本文介绍了春天@Autowired不工作（不总是）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一些问题，在我服务的一个自动装配注解。我花了很多时间来找到解决办法，但我不知道我做错了。我的应用程序看起来是这样的。

I have some problems with autowire annotation in one of my services. I have spent a lot of hours to find a solution but I don't have idea what I'm doing wrong. My app looks like this.

下面是我的控制器：

package control.peso.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import control.peso.data.ResumenMedicionPeso;
import control.peso.service.HomeService;

@Controller
public class HomeController {

    @Autowired
    private HomeService homeService; //NOPMD

    @RequestMapping(value = "json/resumen_mediciones.action")
    @ResponseBody
    public final ResumenMedicionPeso
            dataJsonPeso(final HttpServletRequest req) {
        final ResumenMedicionPeso peso = homeService.getResumenMediciones();

        return peso;
    }
}

我的服务层：

package control.peso.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import control.peso.dao.PesoDAO;
import control.peso.data.ResumenMedicionPeso;

@Service
@Transactional(readOnly = true)
public class HomeService {

    @Autowired
    private PesoDAO pesoDAO; //NOPMD

    public final ResumenMedicionPeso getResumenMediciones() {
        final ResumenMedicionPeso resumMedicionPeso = new ResumenMedicionPeso();
        resumMedicionPeso.setMaxPeso(pesoDAO.getMaxPeso());
        resumMedicionPeso.setMinPeso(pesoDAO.getMinPeso());
        resumMedicionPeso.setMaxGrasa(pesoDAO.getMaxGrasa());
        resumMedicionPeso.setMinGrasa(pesoDAO.getMinGrasa());
        resumMedicionPeso.setMaxPorcenGrasa(pesoDAO.getMaxPorcenGrasa());
        resumMedicionPeso.setMinPorcenGrasa(pesoDAO.getMinPorcenGrasa());
        resumMedicionPeso.setMaxMusculo(pesoDAO.getMaxMusculo());
        resumMedicionPeso.setMinMusculo(pesoDAO.getMinMusculo());
        resumMedicionPeso.setMaxPorcenMusculo(pesoDAO.getMaxPorcenMusculo());
        resumMedicionPeso.setMinPorcenMusculo(pesoDAO.getMinPorcenMusculo());

        return resumMedicionPeso;
    }
}

吾道：

package control.peso.dao;

import java.util.List;

import org.hibernate.SessionFactory;

import control.peso.model.MedicionPeso;

public class PesoDAO implements IPesoDAO {

    private SessionFactory sessionFactory;

    public final SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public final void setSessionFactory(
            final SessionFactory pSessionFactory) {
        this.sessionFactory = pSessionFactory;
    }

    @Override
    public final void addPeso(final MedicionPeso peso) {
        getSessionFactory().getCurrentSession().save(peso); //NOPMD
    }

    @Override
    public final void updatePeso(final MedicionPeso peso) {
        getSessionFactory().getCurrentSession().update(peso);  //NOPMD
    }

    @Override
    public final void deletePeso(final Integer idPeso) {
        getSessionFactory().getCurrentSession()
        .delete(new MedicionPeso(idPeso));
    }

    @Override
    public final MedicionPeso getPesoById(final Integer idPeso) {
        @SuppressWarnings("unchecked") //NOPMD
        final List<MedicionPeso> list = getSessionFactory() // NOPMD
                .getCurrentSession()
                        .createQuery("from MedicionPeso where idPeso = ?")
                .setParameter(0, idPeso).list();

        return list.get(0); //NOPMD
    }

    @Override
    public final List<MedicionPeso> getPesos() {
        @SuppressWarnings("unchecked")
        final List<MedicionPeso> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("from MedicionPeso medicionPeso "
                        + "order by medicionPeso.fechaMedicion desc")
                .list();

        return list;
    }

    public final Float getMaxPeso() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select max(peso) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMinPeso() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select min(peso) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMaxGrasa() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select max(pesoGrasa) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMinGrasa() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select min(pesoGrasa) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMaxPorcenGrasa() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select max(pesoGrasa) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMinPorcenGrasa() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select min(porcentajeGrasa) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    /**
     * Recupera la medicion de musculo con valor maximo.
     * @return El valor maximo de las mediciones de musculo.
     */
    public final Float getMaxMusculo() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select max(porcentajeGrasa) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMinMusculo() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select min(pesoMusculo) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMaxPorcenMusculo() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select max(porcentajeMusculo) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

    public final Float getMinPorcenMusculo() {
        @SuppressWarnings("unchecked")
        final List<Float> list = getSessionFactory() //NOPMD
                .getCurrentSession()
                .createQuery("select max(porcentajeMusculo) from MedicionPeso")
                .list();

        return (Float) list.get(0); //NOPMD
    }

}

我的DAO接口：

My dao interface:

package control.peso.dao;

import java.util.List;

import control.peso.model.MedicionPeso;

public interface IPesoDAO {

    void addPeso(MedicionPeso peso);

    void updatePeso(MedicionPeso peso);

    void deletePeso(Integer idPeso);

    MedicionPeso getPesoById(Integer idPeso);

    List<MedicionPeso> getPesos();
}

这是我的分配器 - servlet.xml中：

This is my dispatcher-servlet.xml:

<?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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <!--Routes -->
    <mvc:view-controller path="/" view-name="home"/>
    <mvc:view-controller path="/home" view-name="home"/>
    <mvc:view-controller path="/medicion" view-name="medicion_peso"/>

    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="control.peso" />

    <!-- Configures the @Controller programming model -->
    <mvc:annotation-driven />

    <!-- misc -->
    <!--
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    -->
    <!-- Tiles Resolver -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass">
            <value>
                org.springframework.web.servlet.view.tiles2.TilesView
            </value>
        </property>
    </bean>
    <bean id="tilesConfigurer"
        class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
        <property name="definitions">
            <list>
                <value>/WEB-INF/tiles.xml</value>
            </list>
        </property>
    </bean>

    <!-- Application Message Bundle -->
    <bean id="messageSource"
        class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="classpath:messages" />
        <property name="defaultEncoding" value="UTF-8" />
    </bean>

    <!-- JSON Objets Definition -->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

    <!-- Beans Declaration -->
    <bean id="MedicionPeso" class="control.peso.model.MedicionPeso" />

    <!-- User DAO Declaration -->
    <bean id="PesoDAO" class="control.peso.dao.PesoDAO">
        <property name="sessionFactory" ref="SessionFactory" />
    </bean>

    <!-- Data Source Declaration -->
    <bean id="DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/juan" />
        <property name="user" value="root" />
        <property name="password" value="" />
        <property name="maxPoolSize" value="10" />
        <property name="maxStatements" value="0" />
        <property name="minPoolSize" value="5" />
    </bean>

    <!-- Session Factory Declaration -->
    <bean id="SessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="DataSource" />
        <property name="annotatedClasses">
            <list>
                <value>control.peso.model.MedicionPeso</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

    <!-- Enable the configuration of transactional behavior based on annotations -->
    <tx:annotation-driven transaction-manager="txManager" />

    <!-- Transaction Manager is defined -->
    <bean id="txManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="SessionFactory" />
    </bean>

</beans>

所以，当我正确启动我的web应用程序，我的控制器Autowires服务，但在我的服务我的DAO对象具有空值（没有正确注入）。

So when I launch my web-app, my controller Autowires correctly the service, but my DAO object in my service has null value (not injected properly).

任何想法？

这是因为好奇，从其他服务，同样的DAO正确注入。

It's curious because from another service, the same DAO is properly injected.

感谢

推荐答案

在主页服务，您所指定的执行 IPesoDAO ，而不是接口。尝试将其更改为 IPesoDAO 来代替，看看是否有帮助。

in your HomeService, you've specified the implementation of IPesoDAO, not the interface. try changing it to IPesoDAO instead and see if that helps.

此外，你可能还需要创建一个接口 IHomeService ，有你的现有主页服务实现它，再，改变控制器，以引用的界面，不执行

in addition, you may also want to create an interface IHomeService and have your existing HomeService implement it, again, changing the controller to reference the interface, not the implementation

这篇关于春天@Autowired不工作（不总是）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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