Struts+Hibernate+Spring 配置问题
新公司要求写一个Struts+Hibernate+Spring的例子,小弟搞了半天还是有问题,求助大家帮忙解决,问题如下:
环境:JDK1.5+Eclipse3.2+MyEclipse5.0+Tomcat5.5+SQL 2000
struts-config.xml内容:
<?xml version= "1.0 " encoding= "UTF-8 "?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN " "http://struts.apache.org/dtds/struts-config_1_2.dtd ">
<struts-config>
<data-sources />
<form-beans >
<form-bean name= "userRegisterForm " type= "test.struts.user.form.UserRegisterForm " />
</form-beans>
<global-exceptions />
<global-forwards />
<action-mappings >
<action
attribute= "userRegisterForm "
input= "/userRegister.jsp "
name= "userRegisterForm "
path= "/userRegister "
scope= "request "
type= "org.springframework.web.struts.DelegatingActionProxy ">
<forward name= "success " path= "/success.jsp " />
<forward name= "fail " path= "/fail.jsp " />
</action>
</action-mappings>
<message-resources parameter= "test.struts.ApplicationResources " />
<plug-in className= "org.springframework.web.struts.ContextLoaderPlugIn ">
<set-property property= "contextConfigLocation " value= "/WEB-INF/classes/applicationContext.xml "/>
</plug-in>
</struts-config>
applicationContext.xml内容:
<?xml version= "1.0 " encoding= "UTF-8 "?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN " "http://www.springframework.org/dtd/spring-beans.dtd ">
<beans>
<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 </value>
</property>
<property name= "username ">
<value> test </value>
</property>
<property name= "password ">
<value> test </value>
</property>
</bean>
<bean id= "sessionFactory "
class= "org.springframework.orm.hibernate3.LocalSessionFactoryBean ">
<property name= "configLocation ">
<value> classpath:hibernate.cfg.xml </value>
</property>
<property name= "dataSource ">
<ref bean= "dataSource "> </ref>
</property>
</bean>
<bean id= "UserDAO " class= "test.hibernate.UserDAO ">
<property name= "sessionFactory ">
<ref bean= "sessionFactory " />
</property>
</bean>
<bean name= "/userRegister " class= "test.struts.user.action.UserRegisterAction ">
<property name= "userDAO ">
<ref bean= "UserDAO "/>
</property>
</bean>
</beans>
UserDAO内容:
package test.hibernate;
// default package
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
/**
* Data access object (DAO) for domain model class User.
* @see .User
* @author MyEclipse - Hibernate Tools
*/
public class UserDAO extends HibernateDaoSupport {
private static final Log log = LogFactory.getLog(UserDAO.class);
//property constants
public static final String USERNAME = "username ";
public static final String PASSWORD = "password ";
public static final String EMAIL = "email ";
public static final String OTHER = "other ";
protected void initDao() {
//do nothing
}
public void save(User transientInstance) {
log.debug( "saving User instance ");
try {
getHibernateTemplate().save(transientInstance);
log.debug( "save successful ");
} catch (RuntimeException re) {
log.error( "save failed ", re);
throw re;
}
}
}
UserRegisterAction.java内容:
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package test.struts.user.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import test.hibernate.User;
import test.hibernate.UserDAO;
import test.struts.user.form.UserRegisterForm;
/**
* MyEclipse Struts
* Creation date: 09-17-2007
*
* XDoclet definition:
* @struts.action path= "/userRegister " name= "userRegisterForm " input= "/userRegister.jsp " scope= "request " validate= "true "
*/
public class UserRegisterAction extends Action {
/*
* Generated Methods
*/
/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
UserRegisterForm userRegisterForm = (UserRegisterForm) form;
try{
UserDAO userDAO = new UserDAO();
User u =new User();
u.setUsername(userRegisterForm.getUsername());
u.setPassword(userRegisterForm.getPassword());
u.setEmail(userRegisterForm.getEmail());
u.setOther(userRegisterForm.getOther());
userDAO.save(u);
return mapping.findForward( "success ");
}catch(Exception e){
e.printStackTrace();
return mapping.findForward( "fail ");
}
}
private UserDAO userDAO;
public void setUserDAO(UserDAO userDAO){
this.userDAO = userDAO;
}
}
问题:
java.lang.NullPointerException
at test.hibernate.UserDAO.save(UserDAO.java:33)
at test.struts.user.action.UserRegisterAction.execute(UserRegisterAction.java:49)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
先谢谢大家了!
[解决办法]
...
getUserDao方法好象没有.
UserDAO userDAO = new UserDAO();这都可以不要吧
[解决办法]
UserDAO userDAO = new UserDAO();根本就是多余,
<bean name= "/userRegister " class= "test.struts.user.action.UserRegisterAction ">
<property name= "userDAO ">
<ref bean= "UserDAO "/>
</property>
</bean>
spring自动注入了