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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="http://www.mamicode.com/">
<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="http://www.mamicode.com/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="http://www.mamicode.com/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="http://www.mamicode.com/false" />
<constant name="struts.devMode" value="http://www.mamicode.com/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：
SSH（七）新的开始
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