model包下实体类:
@Entity
public class User { private int id;
private String name;
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}dao包下UserDAO:@Component
public class UserDAO { private HibernateTemplate hibernateTemplate;
public HibernateTemplate getHibernateTemplate() {
return hibernateTemplate;
} @Resource
public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
} public void save(User user){ this.getHibernateTemplate().save(user);
System.out.println("a user saved");
}
}service包下UserService:@Component("userService")
public class UserService { private UserDAO userDao; public UserDAO getUserDao() {
return userDao;
} @Resource
public void setUserDao(UserDAO userDao) {
this.userDao = userDao;
}
public void add(User user){
userDao.save(user);
}
}bean.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" xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
"> <context:annotation-config />
<context:component-scan base-package="com.spring" /> <!-- more bean definitions go here -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost/spring" />
<property name="username" value="root" />
<property name="password" value="123" />
</bean> <bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.spring.model.User
</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>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory" />
</bean></beans>测试代码如下(用jUnit):
@Test
public void testAdd() throws Exception{
ApplicationContext act=new ClassPathXmlApplicationContext("bean.xml");
UserService service = (UserService) act.getBean("userService");
service.add(new User());
}测试时出现如下错误: No bean named 'userService' is defined这是什么错误啊,明明是没错啊,大侠赐教!
@Entity
public class User { private int id;
private String name;
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}dao包下UserDAO:@Component
public class UserDAO { private HibernateTemplate hibernateTemplate;
public HibernateTemplate getHibernateTemplate() {
return hibernateTemplate;
} @Resource
public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
} public void save(User user){ this.getHibernateTemplate().save(user);
System.out.println("a user saved");
}
}service包下UserService:@Component("userService")
public class UserService { private UserDAO userDao; public UserDAO getUserDao() {
return userDao;
} @Resource
public void setUserDao(UserDAO userDao) {
this.userDao = userDao;
}
public void add(User user){
userDao.save(user);
}
}bean.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" xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
"> <context:annotation-config />
<context:component-scan base-package="com.spring" /> <!-- more bean definitions go here -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost/spring" />
<property name="username" value="root" />
<property name="password" value="123" />
</bean> <bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.spring.model.User
</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>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory" />
</bean></beans>测试代码如下(用jUnit):
@Test
public void testAdd() throws Exception{
ApplicationContext act=new ClassPathXmlApplicationContext("bean.xml");
UserService service = (UserService) act.getBean("userService");
service.add(new User());
}测试时出现如下错误: No bean named 'userService' is defined这是什么错误啊,明明是没错啊,大侠赐教!
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private UserSerivce userSerivce;
get...
set... UserSerivce 这个类也需要定义成spring组件或者在配置文件中配置并加载配置文件
你的test类写为
UserService service = (UserService) act.getBean("userService");
hongse 的应该是接口
你的实习类应该是UserServiceImpl什么的,在UserServiceImpl注解
你对spring基本的东西都不明白。1、定义接口
public interface UserService {
public void add(User user);
}
2、定义接口实现类
@Component("userService")
public class UserServiceImpl implements UserService {@AutoWired
private UserDAO userDao;//此处dao的定义跟service一样,需要dao接口和dao实现类public void add(User user){
userDao.save(user);
}
}
1、
@Test
public void testAdd() throws Exception{
//全用注解配置吧
@AutoWired
private UserService userService;
service.add(new User());
}
@Test
public void testAdd() throws Exception{
//全用注解配置吧
@AutoWired
private UserService userService;
service.add(new User());
}你们方法试了,还是不行,接口也写了,就是不行啊
public interface UserDAO {
public void save(User user);
}UserDAOImpl:@Component("userDao")
public class UserDAOImpl implements UserDAO{ private HibernateTemplate hibernateTemplate;
public HibernateTemplate getHibernateTemplate() {
return hibernateTemplate;
} @Resource
public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
}
public void save(User user) {
this.getHibernateTemplate().save(user);
}
}UserService:@Component("userService")
public class UserService { private UserDAO userDao; public UserDAO getUserDao() {
return userDao;
} @Resource(name="userDao")
public void setUserDao(UserDAO userDao) {
this.userDao = userDao;
}
public void add(User user){
userDao.save(user);
}
}test:@Autowired
private UserService userService;
public UserService getUserService() {
return userService;
} public void setUserService(UserService userService) {
this.userService = userService;
} @Test
public void testAdd() {
userService.add(new User());
}你们说的我都试了,还是那个错误:NullPointer 或 userService not defined ,前辈们请说详细点,我是自学
import javax.persistence.GeneratedValue;
import javax.persistence.Id;@Entity
public class User { private int id;
private String name; @Id
@GeneratedValue
public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
}}
UserDao(楼主的代码出问题的地方),为了测试方便,hibernate的save()给注释掉了。package com.annotation.dao;import javax.annotation.Resource;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.stereotype.Component;
import com.annotation.entity.User;@Component("u")
public class UserDao {
private HibernateTemplate hibernateTemplate; public HibernateTemplate getHibernateTemplate() {
return hibernateTemplate;
} @Resource
public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
}
public void save(User user) {
// this.getHibernateTemplate().save(user);
System.out.println("user saved");
}
}UserService(请楼主注意,setUserDao方法哪里,与UserDao的Component name是一致的,楼主的报错应该就是由于少加了这个。package com.annotation.service;import javax.annotation.Resource;
//import org.springframework.stereotype.Component;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import com.annotation.dao.UserDao;
import com.annotation.entity.User;@Component("userService")
public class UserService {
private UserDao userDao; public UserDao getUserDao() {
return userDao;
} @Resource(name="u")
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public void add(User user) {
userDao.save(user);
}
}beans.xml 这个基本没有变化
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
"> <context:annotation-config />
<context:component-scan base-package="com.annotation" /> <!-- more bean definitions go here -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost/spring" />
<property name="username" value="root" />
<property name="password" value="root" />
</bean> <bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.annotation.entity.User</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>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory" />
</bean></beans>测试代码(Junit,Junit里面加注解好像不行,我试过的,实际上也没有必要)
package com.annotation.dao;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import com.annotation.entity.User;
import com.annotation.service.UserService;
public class UserDaoTest { @Test
public void testSave() {
ApplicationContext act=new ClassPathXmlApplicationContext("beans.xml");
UserService service = (UserService) act.getBean("userService");
service.add(new User()); }
}
1、你不要接口实现类,你如何扩展?
一般都会写成如下:
@Service("userService")
public class UserServiceImpl implements UserService
2、既然用了注解注入,就没有必要再用setter方法注入。
private UserDao userDao; public UserDao getUserDao() {
return userDao;
} @Resource(name="u")
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}可以改为:
@AutoWired
private UserDao userDao;
以为一般一个dao就一个实现类,所以默认按类别装配bean,是不会出问题。
3、
service层,最好用@Service("userService")而非@Component("userService"),这样看起来一目了然。