SSH整合的错误，NullPointerException
SSH整合的一个小例子，struts2+Spring2+Hibernate3
代码如下：
Person.java
- Java code
package com.eva.po;/** * Person entity. * * @author eva */import java.io.Serializable;public class Person implements Serializable{ private int id; private String name; private int age; private String sex; private String address; /** defult constructor */ public Person() { } /** minimal constructor */ public Person(String name) { this.name = name; } /** full constructor */ public Person(String name,int age,String sex,String address) { this.name = name; this.age = age; this.sex = sex; this.address = address; } //setter and getter}PersonDAO.java
- Java code
package com.eva.dao; import java.util.List; import com.eva.po.Person; public interface PersonDAO { public void saveOrUpdate(Person person); public void update(Person person); public void delete(Person person); public Person get(String id); public List<Person> findAll(); } PersonHibernateDAO.java
- Java code
package com.eva.dao.hibernate; import java.util.List; import com.eva.dao.PersonDAO; import com.eva.po.Person; import org.hibernate.SessionFactory; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; public class PersonHibernateDAO extends HibernateDaoSupport implements PersonDAO { public void delete(Person person) { this.getHibernateTemplate().delete(person); } public List<Person> findAll() { List<Person> persons = this.getHibernateTemplate().find("from Person"); return persons; } public Person get(String id) { Person person = (Person)this.getHibernateTemplate().get(Person.class, id); return person; } public void saveOrUpdate(Person person) { this.getHibernateTemplate().saveOrUpdate(person); } public void update(Person person) { this.getHibernateTemplate().saveOrUpdate(person); } } PersonService.java
- Java code
package com.eva.service; import java.util.List; import com.eva.dao.hibernate.PersonHibernateDAO; import com.eva.po.Person; public class PersonService { private PersonHibernateDAO personHibernateDAO; public void setPersonHibernateDAO(PersonHibernateDAO personHibernateDAO) { this.personHibernateDAO = personHibernateDAO; System.out.println("personHibernateDAO is null ? --- " + personHibernateDAO == null); } public PersonHibernateDAO getPersonHibernateDAO() { return personHibernateDAO; } public void saveOrUpdate(Person person) { personHibernateDAO.saveOrUpdate(person); } public void update(Person person) { personHibernateDAO.update(person); } public void delete(Person person) { personHibernateDAO.delete(person); } public List<Person> findAll() { return personHibernateDAO.findAll(); } public Person get(String id) { return personHibernateDAO.get(id); } }
LoginAction.java
- Java code
package com.eva.action; import java.util.List; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; import com.eva.po.Person; import com.eva.service.PersonService; import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport { private PersonService personService; private Person person; private String id; private List<Person> persons; public LoginAction() { } public Person getPerson() { return person; } public void setPerson(Person person) { this.person = person; } public String getId() { return id; } public void setId(String id) { this.id = id; } public PersonService getPersonService() { return personService; } public void setPersonService(PersonService personService) { this.personService = personService; } public List<Person> getPersons() { return persons; } public void setPersons(List<Person> persons) { this.persons = persons; } public String execute() throws Exception { if (person != null & !person.equals("")) { personService.saveOrUpdate(person); } persons = personService.findAll(); setPersons(persons); System.out.println(persons.size()); return SUCCESS; } public String list() throws Exception { persons = personService.findAll(); setPersons(persons); return SUCCESS; } public String save() throws Exception {; personService.saveOrUpdate(person); return SUCCESS; } public String update() throws Exception { person = personService.get(id); personService.update(person); return SUCCESS; } public String getValue() throws Exception { return SUCCESS; } public String delete() throws Exception{ person = personService.get(id); personService.delete(person); return SUCCESS; } }applicationContext.xml
- XML code
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <!-- dataSource配置 --> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName"> <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value> </property> <property name="url"> <value> jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=ssh </value> </property> <property name="username"> <value>sa</value> </property> <property name="password"> <value>sa</value> </property> </bean> <!-- 配置session工厂 --> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource"> <ref bean="dataSource"/> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.SQLServerDialect </prop> </props> </property> <property name="mappingResources"> <list> <value>com/eva/po/Person.hbm.xml</value></list> </property> </bean> <!-- 具体的数据库访问类 --> <bean id="dao" class="com.eva.dao.hibernate.PersonHibernateDAO"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property> </bean> <!-- 配置具体的业务逻辑类 --> <bean id="personService" class="com.eva.service.PersonService"> <property name="personHibernateDAO"> <ref bean="dao"/> </property> </bean> <!-- 配置action --> <bean id="loginAction" class="com.eva.action.LoginAction"> <property name="personService"> <ref bean="personService"/> </property> </bean> </beans>
[解决办法]
personService未注入
[解决办法]
最好把错误信息贴出来
看样子你的spring都没起作用，web.xml里spring的监听你配置了吗