调试Spring

Question

我正在尝试创建自己的eshop。我在创建bean时遇到了问题。

我的套餐如下：

控制器

package com.emusicstore.controller;

import java.io.IOException;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.emusicstore.dao.ProductDao;
import com.emusicstore.model.Product;

@Controller
public class HomeController {

    @Autowired
    private ProductDao productDao;

    @RequestMapping("/")
    public String home(){
        return "home";
    }

    @RequestMapping("/productList")
    public String getProducts(Model model) {
        List<Product> products = productDao.getAllProducts();
        model.addAttribute("products", products);

        return "productList";
    }

ProductDao这个

package com.emusicstore.dao;
import java.util.List;
import com.emusicstore.model.Product;
public interface ProductDao 
{
    void addProduct(Product product);
    Product getProductById (String id);
    List<Product> getAllProducts();
    void deleteProduct (String id);
}

ProductDaoImpl

package com.emusicstore.impl;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import com.emusicstore.dao.ProductDao;
import com.emusicstore.model.Product;

@Component
@Transactional
public class ProductDaoImpl implements ProductDao {

@Autowired
private SessionFactory sessionFactory;

public void addProduct(Product product) {
    Session session = sessionFactory.getCurrentSession();
    session.saveOrUpdate(product);
    session.flush();
}

public Product getProductById(String id) {
    Session session = sessionFactory.getCurrentSession();
    Product product = (Product) session.get(Product.class, id);
    session.flush();

    return product;
}

public List<Product> getAllProducts() {
    Session session = sessionFactory.getCurrentSession();
    Query query = session.createQuery("from Product");
    List<Product> products = query.list();
    session.flush();

    return products;
}

public void deleteProduct(String id) {
    Session session = sessionFactory.getCurrentSession();
    session.delete(getProductById(id));
    session.flush();
}

}

产品

package com.emusicstore.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Product {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private String productId;
private String productName;
private String productCategory;
private String productDescription;
private double productPrice;
private String productCondition;
private String productStatus;
private int unitInStock;
private String productManufacture;

public String getProductId() {
    return productId;
}

public void setProductId(String productId) {
    this.productId = productId;
}

public String getProductName() {
    return productName;
}

public void setProductName(String productName) {
    this.productName = productName;
}

public String getProductCategory() {
    return productCategory;
}

public void setProductCategory(String productCategory) {
    this.productCategory = productCategory;
}

public String getProductDescription() {
    return productDescription;
}

public void setProductDescription(String productDescription) {
    this.productDescription = productDescription;
}

public double getProductPrice() {
    return productPrice;
}

public void setProductPrice(double productPrice) {
    this.productPrice = productPrice;
}

public String getProductCondition() {
    return productCondition;
}

public void setProductCondition(String productCondition) {
    this.productCondition = productCondition;
}

public String getProductStatus() {
    return productStatus;
}

public void setProductStatus(String productStatus) {
    this.productStatus = productStatus;
}

public int getUnitInStock() {
    return unitInStock;
}

public void setUnitInStock(int unitInStock) {
    this.unitInStock = unitInStock;
}

public String getProductManufacture() {
    return productManufacture;
}

public void setProductManufacture(String productManufacture) {
    this.productManufacture = productManufacture;
}

}

此外，我还有一个jdbc.properties文件，其中包含用于连接MySQL的用户名，密码等信息。 我认为上述文件是正确的。

applicationContext.xml（我的代码的一部分）

<beans profile="dev">
        <context:property-placeholder location="jdbc.properties" />
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
            destroy-method="close">
            <property name="driverClassName" value="${jdbc.driver}"></property>
            <property name="url" value="${jdbc.url}"></property>
            <property name="password" value="${jdbc.password}"></property>
            <property name="username" value="${jdbc.username}"></property>
        </bean>
        <bean id="sessionFactory"
            class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

            <property name="dataSource" ref="dataSource"></property>
            <property name="hibernateProperties">
                <props>
                    <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                    <prop key="hibernate.hbm2ddl.auto">update</prop>
                    <prop key="hibernate.show_sql">true</prop>
                    <prop key="hibernate.format_sql">true</prop>
                </props>
            </property>
            <property name="packagesToScan">
                <list>
                    <value>com.emusicstore.*</value>
                </list>
            </property>
        </bean>
        <bean id="transactionManager"
            class="org.springframework.orm.hibernate4.HibernateTransactionManager">
            <property name="sessionFactory" ref="sessionFactory"></property>
        </bean>
        <!-- Is <tx:annotation-driven /> is necessary in this file?? -->
</beans>

dispatcher-servlet.xml（我的代码的一部分）

<context:annotation-config></context:annotation-config>

<context:annotation-config /> 
<mvc:annotation-driven />

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
</bean>

<mvc:resources mapping="/resources/**" location="/WEB-INF/resources/" />

<tx:annotation-driven />

web.xml（我的代码的一部分）

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/dispatcher-servlet.xml
        /WEB-INF/applicationContext.xml
    </param-value>
</context-param>

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

当我尝试运行我的项目所有与以下相关的错误时：

org.springframework.beans.factory.BeanCreationException
org.springframework.beans.factory.NoSuchBeanCreationDefinitionException

第一个错误是创建bean'homeController'。     无法自动装配字段：private com.emusicstore.dao.ProductDao com.emusicstore.controller.HomeController.productDao;

我的问题。

1）applicationContext.xml

我要放哪个文件（或多个文件）？现有路径是正确的还是我必须专门修改它（例如com.emusicstore.dao）？在这个列表中，我必须为我的dao建模整个路径？

2）dispatcher-servlet.xml

正确的上下文路径的相同问题：组件扫描。在base-package上我可以只为我的控制器指定包（com.emusicstore.controller）？

我搜索了较旧的帖子，但我没有解决我的问题。

提前谢谢你，迈克

修改

（我们）更改摘要

的applicationContext.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: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/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">

        <beans profile="dev">

            <context:annotation-config></context:annotation-config>
            <context:component-scan base-package="com.emusicstore.dao, com.emusicstore.impl"></context:component-scan> 


            <context:property-placeholder location="jdbc.properties" />

            <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
                destroy-method="close">

                <property name="driverClassName" value="${jdbc.driver}"></property>
                <property name="url" value="${jdbc.url}"></property>
                <property name="password" value="${jdbc.password}"></property>
                <property name="username" value="${jdbc.username}"></property>
            </bean>

            <!-- MY CHANGES -->
            <!-- LocalSessionFactoryBean for hibernate4 -->

            <bean id="sessionFactory"
                class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

                <property name="dataSource" ref="dataSource"></property>
                <property name="hibernateProperties">
                    <props>
                        <!-- CHANGE HERE FOR MySQL -->
                        <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                        <prop key="hibernate.hbm2ddl.auto">update</prop>
                        <prop key="hibernate.show_sql">true</prop>
                        <prop key="hibernate.format_sql">true</prop>
                    </props>
                </property>
                <!-- To know where is ProductDao -->
                <property name="packagesToScan">
                    <list>
                        <value>com.emusicstore.dao</value>
                        <value>com.emusicstore.impl</value>
                    </list>
                </property>
            </bean>

            <bean id="transactionManager"
                class="org.springframework.orm.hibernate4.HibernateTransactionManager">
                <property name="sessionFactory" ref="sessionFactory"></property>
            </bean>
            <tx:annotation-driven transaction-manager="transactionManager" />
        </beans>
    </beans>

调度-servlet.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:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd">


    <context:component-scan base-package="com.emusicstore." />

    <context:annotation-config></context:annotation-config>

    <mvc:annotation-driven />

    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <mvc:resources mapping="/resources/**" location="/WEB-INF/resources/" />

    <tx:annotation-driven />
</beans>

Web.xml 与您编写的代码完全相同

相同的错误仍然存​​在，但Eclipse上的“主页”已更改为此

HTTP Status 500 - Servlet.init() for servlet dispatcher threw exception

type Exception report

message Servlet.init() for servlet dispatcher threw exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception
javax.servlet.ServletException: Servlet.init() for servlet dispatcher threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:495)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:767)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1347)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Unknown Source)

再次出现以前的错误......

修改

web.xml（第一行）

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    version="3.1">

pom.xml（我的所有文件）

        <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.mywebsite</groupId>
    <artifactId>eMusicStore</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
            <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

            <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>

                <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
                <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>


        <!-- To work with Hibernate -->
        <!-- All Hibernate in single dependency -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.0.2.Final</version>
        </dependency>
        <!-- MySql -->
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <!-- To connect with the jdbc.properties file -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.5.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

Answer 1

Traditionnaly我们在Spring MVC应用程序中有2个上下文。根上下文（这里是你的applicationContext.xml），我们定义所有不专用于web东西的bean，如DAO，Securtity等......以及DispatcherServlet上下文（dispatcher-servlet.xml），我们在其中定义与web相关的所有bean控制器等操作。

所以，把你的DAO bean放在applicationContext.xml这样的：<context:component-scan base-package="com.emusicstore.dao"/>和你的交易经理<tx:annotation-driven transaction-manager="transactionManager"/>

对于你的第二个问题，你可以像这样放置超级包：<context:component-scan base-package="com.emusicstore."/>

修改

这里你的web.xml应该是这样的：

<context-param>
   <param-name>contextConfigLocation</param-name>
     <param-value>
      /WEB-INF/applicationContext.xml
    </param-value>
</context-param>
<listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
  <servlet-name>dispatcher</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param> 
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/dispatcher-servlet.xml
        </param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>dispatcher</servlet-name>
  <url-pattern>/</url-pattern>
</servlet-mapping>

我的配置是你混合了2个上下文。