SSH(三)——实现Service层、事务管理以及部署业务逻辑组件和实现Web层

1.实现业务逻辑组件

EmployeeService.java的源代码。

package org.coolerwu.mydo.service;

import java.util.List;

import org.coolerwu.mydo.domain.Employee;

public interface EmployeeService {

/**
* 登录失败
*/
public static final int LOGIN_FAIL = 0;

/**
* 以普通员工登录
*/
public static final int LOGIN_EMP = 1;

/**
* 以经理登录
*/
public static final int LOGIN_MGR = 2;

/**
*
* @param user
* @param password
* @return
*/
List<Employee> queryEmployee(String user, String password);
}

EmployeeServiceImpl.java的源代码。

package org.coolerwu.mydo.service.impl;

import java.util.List;

import org.coolerwu.mydo.dao.EmployeeDao;
import org.coolerwu.mydo.domain.Employee;
import org.coolerwu.mydo.service.EmployeeService;

public class EmployeeServiceImpl implements EmployeeService{
private EmployeeDao employeeDao;

public void setEmployeeDao(EmployeeDao employeeDao) {
this.employeeDao = employeeDao;
}

@Override
public List<Employee> queryEmployee(String user, String password) {
List<Employee> l = employeeDao.queryEmployee(user, password);

return l;
}

}

其中获取数据可以用VO模式，这样便于JSON数据传输方便

EmployeeVo.java的源代码。

package org.coolerwu.mydo.vo;

import java.io.Serializable;

public class EmployeeVo implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;

private String user;
private String password;
private double salary;

public String getUser() {
return user;
}

public void setUser(String user) {
this.user = user;
}

public String getPassword() {
return password;
}

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

public double getSalary() {
return salary;
}

public void setSalary(double salary) {
this.salary = salary;
}

public EmployeeVo(String user, String password, double salary) {
super();
this.user = user;
this.password = password;
this.salary = salary;
}

public EmployeeVo() {
super();
}
}

2.事务管理以及部署业务逻辑组件

在tx:命名空间下的tx:advice元素用于配置事务增强处理，而aop:命名空间下的aop:advisor元素用于配置自动代理

applicationContext.xml的源代码。

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schema
4000
Location="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd"> 
<!-- 定义业务逻辑组件模板,为之注入DAO组件 -->
<bean id="employeeTemplate" abstract="true" lazy-init="true"
p:employeeDao-ref="employeeDao"/>

<!-- 定义业务逻辑组件，继承业务逻辑组件的模板 -->
<bean id="employeeService" class="org.coolerwu.mydo.service.impl.EmployeeServiceImpl"
parent="employeeTemplate"/>

<!-- 配置Hibernate的局部事务管理器，使用HibernateTransactionManager类
并注入SessionFactory的引用 -->
<bean id="transactionManager" class=
"org.springframework.orm.hibernate4.HibernateTransactionManager"
p:sessionFactory-ref="sessionFactory"/>

<!-- 配置事务增强处理Bean,指定事务管理器 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!-- 用于配置详细的事务语义 -->
<tx:attributes>
<!-- 所有以'get'开头的方法是read-only的 -->
<tx:method name="get*" read-only="true"/>
<!-- 其他方法使用默认的事务设置 -->
<tx:method name="*"/>
</tx:attributes>
</tx:advice>
<aop:config>
<!-- 配置一个切入点，匹配empManager和mgrManager
两个Bean的所有方法的执行 -->
<aop:pointcut expression="bean(employeeService)" id="coolerwuPointcut"/>
<!-- 指定在leePointcut切入点应用txAdvice事务增强处理 -->
<aop:advisor advice-ref="txAdvice"
pointcut-ref="coolerwuPointcut"/>
</aop:config>
</beans>

3.实现系统Web层

web.xml的源代码。

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

<!-- 定义Struts 2的核心Filter -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<!-- 让Struts 2的核心Filter拦截所有请求 -->
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 配置Spring配置文件的位置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/daoContext.xml, /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>

</web-app>

一旦Spring容器初始化完成，Struts2的Action就可通过自动装配策略来访问Spring容器中的Bean，例如Action中包含一个setA()方法，如果Spring容器中有一个id为a的bean实例，则该bean将会被自动装配给该Action。在自动装配策略下，如果不指定自动装配，则系统默认使用按byName自动装配。byName：是根据setter方法名进行自动装配。Spring容器查找容器中的全部Bean，找出id与setter方法名去掉set前缀，并小写首字母后同名的Bean来完成注入。如果没有找到匹配的Bean实例，则Spring不会进行任何注入。

struts.xml的源代码。

<?xml version="1.0" encoding="GBK"?>

<!-- 指定Struts2配置文件的DTD信息 -->
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<!-- Struts2配置文件的根元素 -->
<struts>

<!-- 配置了系列常量 -->
<constant name="struts.custom.i18n.resources" value="resource"/>
<constant name="struts.i18n.encoding" value="GBK"/>
<constant name="struts.devMode" value="true"/>

<package name="default" extends="struts-default">

<!-- 登录验证 -->
<action name="login" class="org.coolerwu.action.LoginAction">
<result>/WEB-INF/success.jsp</result>
<result name="error">/WEB-INF/failed.jsp</result>
</action>

</package>

</struts>

EmployeeBaseAction.java的源代码。

package org.coolerwu.action.base;

import org.coolerwu.mydo.service.EmployeeService;

import com.opensymphony.xwork2.ActionSupport;

public class EmployeeBaseAction extends ActionSupport{

/**
*
*/
private static final long serialVersionUID = 1L;

protected EmployeeService eps;

public void setEmployeeService(EmployeeService eps) {
this.eps = eps;
}
}

LoginAction.java的源代码。

package org.coolerwu.action;

import java.util.List;

import org.coolerwu.action.base.EmployeeBaseAction;
import org.coolerwu.mydo.domain.Employee;
import org.coolerwu.mydo.vo.EmployeeVo;

public class LoginAction extends EmployeeBaseAction{

/**
*
*/
private static final long serialVersionUID = 1L;

private String user;
private String password;

@Override
public String execute() throws Exception {
List<Employee> l = (List<Employee>) eps.queryEmployee(user, password);
EmployeeVo vo = new EmployeeVo();

if(l.size() != 0){

for(Employee o : l){
vo.setUser(o.getUser());
vo.setPassword(o.getPassword());
vo.setSalary(o.getSalary());
}

System.out.println(vo);
addActionMessage("登录成功");
return SUCCESS;
}
addActionMessage("登录失败");
return ERROR;
}

public void setUser(String user) {
this.user = user;
}

public String getUser() {
return user;
}

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

public String getPassword() {
return password;
}

}

4.剩下的jsp源代码。

login.jsp源代码。

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录界面</title>
</head>
<body>
<s:form action="login">
<s:textfield name="user" value=""/>
<s:textfield name="password" value=""/>
<s:submit value="login"/>
</s:form>
</body>
</html>

success.jsp源代码。

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>成功</title>
</head>
<body>
<s:actionmessage/>
</body>
</html>

failed.jsp源代码。

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>失败</title>
</head>
<body>
<s:actionmessage/>
</body>
</html>