SSH例子

jasondxh

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2011-04 ( 1)
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java

SSH Java Bean Struts Spring

最近在做一个SSH整合注册的小例子，老是出错！！！

我把自己做的步骤写出来，希望大家能帮忙解决，谢谢！！！

1、在myeclipse建立一个web project，名为ssh7

2、添加struts2支持

3、添加spring支持

4、添加hibernate支持

5、反转生成pojo对象及映射文件

6、编写Dao层，并添加到spring bean配置中

UserDao.java

/**
 * @author  Jason
 * @date    2011-4-11上午10:43:47
 */
package com.dao;

import com.model.User;

public interface UserDao {
	public Integer save(User user);
}

UserDaoImpl.java

/**
 * @author  Jason
 * @date    2011-4-11上午10:46:21
 */
package com.dao.impl;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.dao.UserDao;
import com.model.User;

public class UserDaoImpl extends HibernateDaoSupport implements UserDao {

	public Integer save(User user) {
		return (Integer) getHibernateTemplate().save(user);
	}
}

在applicationContext.xml中加入

	<!-- 反射注入Dao层 -->
	<bean id="userDao" class="com.dao.impl.UserDaoImpl">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>

7、编写service层，并在spring中配置bean

UserService.java

/**
 * @author  Jason
 * @date    2011-4-11上午10:50:01
 */
package com.service;

public interface UserService {
	public boolean register(String username, String password);
}

UserServiceImpl.java

/**
 * @author  Jason
 * @date    2011-4-11上午10:55:29
 */
package com.service.impl;

import com.dao.UserDao;
import com.model.User;
import com.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao;

	public UserDao getUserDao() {
		return userDao;
	}

	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}

	public boolean register(String username, String password) {
		User user = new User();
		user.setName(username);
		user.setPassword(password);
		int result = userDao.save(user);
		if (result > 0) {
			return true;
		} else {
			return false;
		}
	}
}

在applicationContext.xml注入bean

<!-- 反射注入service层 -->
	<bean id="userService" class="com.service.impl.UserServiceImpl">
		<property name="userDao" ref="userDao"></property>
	</bean>

8、编写action类

RegisterAction.java

/**
 * @author  Jason
 * @date    2011-4-11上午11:05:24
 */
package com.action;

import com.opensymphony.xwork2.ActionSupport;
import com.service.UserService;

public class RegisterAction extends ActionSupport {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String username;
	private String password;
	private UserService userService;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public UserService getUserService() {
		return userService;
	}

	public void setUserService(UserService userService) {
		this.userService = userService;
	}

	public String execute() {
		if (userService.register(getUsername(), getPassword())) {
			return SUCCESS;
		} else {
			return ERROR;
		}
	}
}

9、编写视图资源

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
	<head>
		<title>注册页面</title>
	</head>
	<body>
		<s:form action="register" method="post">
			<h2>
				注册
			</h2>
			<s:div>
				<s:textfield name="username" label="用户名" size="20"></s:textfield>
				<s:password name="password" label="密码" size="20"></s:password>
				<s:submit value="注册"></s:submit>
			</s:div>
		</s:form>
	</body>
</html>

success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
	<head>
		<title>注册成功页面</title>
	</head>
	<body>
		注册成功！
	</body>
</html>

error.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
	<head>

	</head>
	错误！
</html>

10、配置struts.xml中action与视图资源的对应关系，把spring启动配置到web.xml

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<package name="ssh" extends="struts-default">
		<!-- 定义处理用户请求的Action，指定该Action的实现类-->
		<action name="register" class="com.action.RegisterAction">
			<!-- 为两个逻辑视图配置视图页面 -->
			<result name="error">/error.jsp</result>
			<result name="success">/success.jsp</result>
		</action>
	</package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	<!-- spring配置-->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>WEB-INF/classes/applicationContext.xml</param-value>
	</context-param>
	<!-- 使用ContextLoaderListener初始化Spring容器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>
			org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
</web-app>

11、最后附上applicationContext.xml配置及工程结构图

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-3.0.xsd">


	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver">
		</property>
		<property name="url" value="jdbc:mysql://127.0.0.1:3306/test"></property>
		<property name="username" value="root"></property>
		<property name="password" value="123"></property>
	</bean>
	<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.MySQLDialect
				</prop>
			</props>
		</property>
		<property name="mappingResources">
			<list>
				<value>com/model/User.hbm.xml</value>
			</list>
		</property>
	</bean>
	<!-- 反射注入Dao层 -->
	<bean id="userDao" class="com.dao.impl.UserDaoImpl">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	<!-- 反射注入service层 -->
	<bean id="userService" class="com.service.impl.UserServiceImpl">
		<property name="userDao" ref="userDao"></property>
	</bean>
</beans>

项目图

12、发布运行项目

运行结果出现异常,错误信息如下

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
	com.action.RegisterAction.execute(RegisterAction.java:44)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	java.lang.reflect.Method.invoke(Method.java:597)
	com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
	com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
	com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
	org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
	org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
	org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
	org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.29 logs.

Apache Tomcat/6.0.29

麻烦大家看看，我这是哪里出错了！

当我在userDaoImpl.java里做单元测试时，是可以连接到插入到数据库的。测试代码如下

@Test
	public void saveTest() {
		User user = new User();
		user.setName("aaddd");
		user.setPassword("bb");
		ApplicationContext ctx = new ClassPathXmlApplicationContext(
				"applicationContext.xml");
		UserDao userDao = (UserDao) ctx.getBean("userDao");
		userDao.save(user);
	}

所以我觉得应该是spring出错，但不知道怎么搞！！！！！抓狂！！！！！！都搞了差不多两天了，网上的例子都乱七八糟的，改都改不了。。。

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