問題描述

@Repositorypublic class AuthorAdminDaoImpl implements IAuthorAdminDao { @Resource private BaseDAO basedao;public boolean loginAuthorAdmin(AuthorAdmin aa) {try { String queryString = ' from AuthorAdmin a where a.authorName= ? and a.authorPwd= ? '; basedao=new BaseDAO(); if (basedao.getTemplate() == null) {System.out.println('沒有獲得HibernateTemplate?'); } List<AuthorAdmin> find = (List<AuthorAdmin>) basedao.getTemplate().find( queryString, aa.getAuthorUsername(), aa.getAuthorPwd()); if (find != null && find.size() > 0) {return true; } else {return false; }} catch (Exception e) { e.printStackTrace(); throw new RuntimeException();}} }

public class BaseDAO extends HibernateDaoSupport{ public HibernateTemplate getTemplate(){return getHibernateTemplate(); }}

HibernateTemplate為空不知道為什么？用的是Spring注入

<?xml version='1.0' encoding='UTF-8'?><beans xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://www.springframework.org/schema/beans' xmlns:context='http://www.springframework.org/schema/context'xmlns:aop='http://www.springframework.org/schema/aop'xsi:schemaLocation='http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.1.xsd'><!-- 激活組件掃描功能,在包gk.aop及其子包下面自動(dòng)掃描通過注解配置的組件 --> <context:component-scan base-package='com.lcy' /> <!-- 激活自動(dòng)代理功能,false或者省略基于接口的代理，為true基于類的的代理 --> <aop:aspectj-autoproxy proxy-target- /> <bean class='org.apache.commons.dbcp.BasicDataSource'><property name='driverClassName' value='com.mysql.jdbc.Driver'></property><property name='url' value='jdbc:mysql://localhost:3306/ssh'></property><property name='username' value='root'></property><property name='password' value='root'></property> </bean> <bean class='org.springframework.orm.hibernate3.LocalSessionFactoryBean'><property name='dataSource'> <ref bean='dataSource' /></property><property name='hibernateProperties'> <props><prop key='hibernate.dialect'> org.hibernate.dialect.MySQLDialect</prop><prop key='hibernate.format_sql'> true</prop><prop key='hibernate.show_sql'> true</prop> </props></property><property name='mappingResources'> <list><value>com/lcy/po/DocumentInfo.hbm.xml</value><value>com/lcy/po/ColumnEditorAdmin.hbm.xml</value><value>com/lcy/po/ExpertAdmin.hbm.xml</value><value>com/lcy/po/AttachInfo.hbm.xml</value><value>com/lcy/po/DocumentStateInfo.hbm.xml</value><value>com/lcy/po/ColumnInfo.hbm.xml</value><value>com/lcy/po/MessageInfo.hbm.xml</value><value>com/lcy/po/MagazineEditorAdmin.hbm.xml</value><value>com/lcy/po/BoardInfo.hbm.xml</value><value>com/lcy/po/ExpertAssess.hbm.xml</value><value>com/lcy/po/AuthorAdmin.hbm.xml</value> </list></property> </bean> <bean class='com.lcy.dao.BaseDAO'><property name='sessionFactory'> <ref bean='sessionFactory'></ref></property> </bean></beans>

問題解答

本來 Spring 已經(jīng)幫你把 basedao 注入了你XML里配置好的對(duì)象, 你后面又用

basedao = new BaseDAO();

創(chuàng)建了個(gè)新對(duì)象, 把那個(gè) Spring 給注入的 bean 替換掉了...