SSH（七）新的开始

在完成了ssh框架搭建的基础上，我尝试着去了解更多。新一阶段还是一些简单的增删改查，只是提高自己的熟练度。

这一片我要创建一个登录页面，并查询数据库完成登录。

一、创建实体：

1、1新建职员实体employee：

package com.ssh.entity;

import java.util.Date;

public class Employee {

	private int employee_id;

	private String username;

	private String password;

	private String sex;

	private String positioin;

	private int phone;

	private Date birthday;

	//所属部门

	private Department department;

	public int getEmployee_id() {

		return employee_id;

	}

	public void setEmployee_id(int employeeId) {

		employee_id = employeeId;

	}

	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 String getSex() {

		return sex;

	}

	public void setSex(String sex) {

		this.sex = sex;

	}

	public String getPositioin() {

		return positioin;

	}

	public void setPositioin(String positioin) {

		this.positioin = positioin;

	}

	public int getPhone() {

		return phone;

	}

	public void setPhone(int phone) {

		this.phone = phone;

	}

	public Date getBirthday() {

		return birthday;

	}

	public void setBirthday(Date birthday) {

		this.birthday = birthday;

	}

	public Department getDepartment() {

		return department;

	}

	public void setDepartment(Department department) {

		this.department = department;

	}

}

1、2创建部门实体department：

package com.ssh.entity;

import java.util.HashSet;

import java.util.Set;

public class Department {

	private int department_id;

	private String department_name;

	private String department_parent_id;

	//部门员工集合（hibernate有单向关联，这里用双向关联）

	private Set<Employee> employees = new HashSet<Employee>();

	public int getDepartment_id() {

		return department_id;

	}

	public void setDepartment_id(int departmentId) {

		department_id = departmentId;

	}

	public String getDepartment_name() {

		return department_name;

	}

	public void setDepartment_name(String departmentName) {

		department_name = departmentName;

	}

	public String getDepartment_parent_id() {

		return department_parent_id;

	}

	public void setDepartment_parent_id(String departmentParentId) {

		department_parent_id = departmentParentId;

	}

	public Set<Employee> getEmployees() {

		return employees;

	}

	public void setEmployees(Set<Employee> employees) {

		this.employees = employees;

	}

}

二、实体映射文件：

2、1employee的映射文件employee.hbm.xml:

（注意职员表和部门表的对应关系多对一）

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC

    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

	<class name="com.ssh.entity.Employee" table="employee">

		<id name="employee_id" column="employee_id">

			<generator class="native"></generator>

		</id>

		<property name="username" column="username" length="20"></property>

		<property name="password" column="password" length="20"></property>

		<property name="sex" column="sex" length="2"></property>

		<property name="positioin" column="positioin" length="20"></property>

		<property name="phone" column="phone" length="20"></property>

		<property name="birthday" column="birthday" ></property>

		<!-- 配置关联关系，员工对部门是多对一，这里生成的也是数据库表的外键。 -->

		<many-to-one name="department" class="com.ssh.entity.Department" column="depart_id"/>

	</class>

</hibernate-mapping>

2、2department实体映射文件：department.hmb.xml:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC

    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

	<class name="com.ssh.entity.Department" table="department">

		<id name ="department_id" column="department_id">

			<generator class="native"></generator>

		</id>

		<property name="department_name" column="department_name" length="20"></property>

		<property name="department_parent_id" column="department_parent_id" length="50"></property>

		<!-- 配置关联关系 -->

		<set name="employees">

			<key column="depart_id"></key>

			<one-to-many class="com.ssh.entity.Employee"/>

		</set>

	</class>

</hibernate-mapping>

3、3在applicationcontext.xml→sessionFactory→mappingResources引入hibernate映射文件：

        	<property name="mappingResources">

        		<list>

        			<!-- 映射文件全路径 -->

        			<value>com/ssh/entity/product.hbm.xml</value>

        			<value>com/ssh/entity/Department.hbm.xml</value>

        			<value>com/ssh/entity/Employee.hbm.xml</value>

        		</list>

        	</property>

运行项目，让ssh为你在数据库去创建你要的employee、department表。

三、新建登录页面

就在index.xml基础上修改吧。

这里有一个struts2的标签可以学习下：<h1><s:actionerror/></h1>他可以将后台的错误提示信息自动显示。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!-- struts2 标签库 -->

<%@taglib uri ="/struts-tags" prefix="s" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>登录页面</title>

	<meta http-equiv="pragma" content="no-cache">

	<meta http-equiv="cache-control" content="no-cache">

	<meta http-equiv="expires" content="0">

	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

	<meta http-equiv="description" content="This is my page">

	<!--

	<link rel="stylesheet" type="text/css" href="styles.css">

	-->

  </head>

  <body>

  	<div align="center">

  		<h1><s:actionerror/></h1>

  		<h1>欢迎</h1>

    <s:form action="door_login" method="post" namespace="/" theme="simple">

    	<table border="1" width="400">

    		<tr>

    			<td>用户名：</td>

    			<td><s:textfield name="username"/></td>

    		</tr>

    		<tr>

    			<td>密    码：</td>

    			<td><s:textfield name="password"/></td>

    		</tr>

    		<tr>

    			<!-- colspan: 合并单元格-->

    			<td align="center" colspan="2"><input type="submit" value="登录"> </td>

    		</tr>

    	</table>

    </s:form>

  	</div>

  </body>

</html>

四、控制层、业务层、持久层登录方法的实现：

employeeAction：使用模型驱动ModelDriven接收前端数据

这里面有一个addActionError的方法，就是将错误提示信息返回给前端页面。

package com.ssh.action;

import java.util.Date;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.ModelDriven;

import com.ssh.entity.Employee;

import com.ssh.service.employeeService;

public class employeeAction extends ActionSupport implements ModelDriven<Employee> {

	private Employee employee = new Employee();

	//使用模型驱动接收前段页面数据，并将获取数据封装到employee对象。

	public Employee getModel() {

		// TODO Auto-generated method stub

		return employee;

	}

	//注入业务层类

	private employeeService employeeService;

	public void setEmployeeService(employeeService employeeService) {

		this.employeeService = employeeService;

	}

	public String login(){

		Employee existEmployee = employeeService.login(employee);

		Date date = new Date();

		if (existEmployee != null) {

			System.out.println("acction"+existEmployee);

			//登陆成功，提示登录成功！把登录信息存入session

			this.addActionMessage(existEmployee.getUsername()+"登录成功！"+"\t"+date);

			ActionContext.getContext().getSession().put("existEmployee", employee);

			return SUCCESS;

		}else {

			//登录失败，提示错误信息，返回登录界面。

			this.addActionError("用户名或密码错误！");

			return INPUT;

		}

		//return NONE;

	}

}

employeeService：

public interface employeeService {

	Employee login(Employee employee);

}

实现类employeeServiceImpl：

public class employeeServiceImpl implements employeeService {

	private employeeDao employeeDao;

	//注入dao

	public void setEmployeeDao(employeeDao employeeDao) {

		this.employeeDao = employeeDao;

	}

	public Employee login(Employee employee) {

		Employee existEmployee = employeeDao.findUsernameAndPassword(employee);

		return existEmployee;

	}

}

employeeDao：

public interface employeeDao {

	Employee findUsernameAndPassword(Employee employee);

}

实现类employeeDaoImpl：注意继承hibernate模板

public class employeeDaoImpl extends HibernateDaoSupport implements employeeDao {

	public Employee findUsernameAndPassword(Employee employee) {

		String hql ="from Employee where username = ? and password = ?";

		List<Employee> list =this.getHibernateTemplate().find(hql, employee.getUsername(),employee.getPassword());

		if (!list.isEmpty()) {

			System.out.println("dao:"+list.get(0));

			return list.get(0);

		}

		return null;

	}

}

五、配置applicationcontext.xml以及struts.xml：

5、1控制层、业务层、持久层的注入配置：

		<bean id="employeeAction" class="com.ssh.action.employeeAction" scope="prototype">

			<!-- 需要手动注入service -->

			<property name="employeeService" ref="employeeService"></property>

		</bean>

		<!-- 配置业务层的类 -->

		<bean id="employeeService" class="com.ssh.service.impl.employeeServiceImpl">

			<property name="employeeDao" ref="employeeDao"></property>

		</bean>

	    <!-- 配置dao层：注入hibernate模板 -->

        <bean id="employeeDao" class="com.ssh.dao.impl.employeeDaoImpl">

        	<!-- ref 值与sessionFactory bean id保持一致 -->

        	<property name="sessionFactory" ref="sessionFactory"></property>

        </bean>

5.2struts.xml的action配置：

注意这里配置的两个返回结果标签result，成功的跳转addproduct。jsp，失败的返回登录页。

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />

    <constant name="struts.devMode" value="false" />

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

        <action name="door_*" class="employeeAction" method="{1}">

        	<result name="success">/addproduct.jsp</result>

        	<result name="input">/index.jsp</result>

        </action>

    </package>

</struts>

六、运行项目

成功跳转：

巴特西

SSH（七）新的开始

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