java - Spring不调用setter

Question

我有以下配置 web.xml:

    <!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >



<web-app>

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

  <servlet-mapping>
    <servlet-name>minapp</servlet-name>
    <url-pattern>hello.htm</url-pattern>
  </servlet-mapping>

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

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

  <welcome-file-list>
    <welcome-file>
      index.jsp
    </welcome-file>
  </welcome-file-list>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
</web-app>

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:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="myDataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/minapp" />
        <property name="username" value="root" />
        <property name="password" value="verysecret" />
    </bean>


    <bean id="myUserDAO" class="no.java.UserDAOImpl">
        <property name="DataSource" ref="myDataSource"/>
    </bean>

    <bean name="/register/register.htm" class="no.java.RegistrationController" >
        <property name="UserDAO" ref="myUserDAO" />
    </bean>

</beans>

注册 Controller 的 setter

private UserDAO userDAO;

public void setUserDAO(UserDAO userDAO) {
    System.out.println("dao set");
    if (userDAO == null){

        System.out.println("dao null");
    }
    this.userDAO = userDAO;
}

UserDAOImpl 的 setter :

private DataSource dataSource;

    public void setDataSource(DataSource source){
        System.out.println("data source setter called");
        this.dataSource=source;

    }

而且 RegistrationController setter 和 UserDAOImpl setter 都不会被调用。 我有一种感觉，我可能放错了配置，但由于 Spring 文档的复杂性，我无法理解我做错了什么。 据我了解 contextConfigLocation 应该将 spring 指向 applicationContext.xml ，并且该文件应该发挥一些作用来设置数据库连接，但事实并非如此。 如果有任何帮助，我将非常感激。

Answer 1

您还需要将上下文加载器添加到 web.xml 中，以启动独立于 Dispatcher Servlet 的 ApplicationContext。

<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>