hibernate + struts demo

 

1.entity(dept.java    ,    employee.java,    dept.hbm.xml    , employee.hbm.xml)

public class dept {
private int deptid;
private String deptname;
private Set<employee> emps= new HashSet<employee>();
public dept(int deptid, String deptname) {
    super();
    this.deptid = deptid;
    this.deptname = deptname;
}

public dept() {                   //如果该处没增加 构造函数 ，会报错无构造器
    super();
    // TODO Auto-generated constructor stub
}

public int getDeptid() {
    return deptid;
}
public void setDeptid(int deptid) {
    this.deptid = deptid;
}
public String getDeptname() {
    return deptname;
}
public void setDeptname(String deptname) {
    this.deptname = deptname;
}
public Set<employee> getEmps() {
    return emps;
}
public void setEmps(Set<employee> emps) {
    this.emps = emps;
}

@Override
public String toString() {
    return "dept [deptid=" + deptid + ", deptname=" + deptname + "]";
}

}

public class employee {
private int empid;
private String empname;
private double  salary;
private dept dept;
public int getEmpid() {
    return empid;
}
public void setEmpid(int empid) {
    this.empid = empid;
}
public String getEmpname() {
    return empname;
}
public void setEmpname(String empname) {
    this.empname = empname;
}
public double getSalary() {
    return salary;

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    
    
    
<hibernate-mapping  package="cn.itcast.entity" >  
    <class name="dept"  table="t_dept">
    <id name="deptid" >
    <generator class="native"></generator>
    
    </id>
    <property name="deptname" length="20"/>
    
    <set name="emps">
    <key column="dept_id"></key>
    <one-to-many  class="employee"/>
    
    </set>
    </class>
    
    

    
    </hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    
    
    
<hibernate-mapping  package="cn.itcast.entity" >  
    <class name="employee"  table="t_employ">
    <id name="empid" >
    <generator class="native"></generator>
    
    </id>
    <property name="empname"  length="20" />
     <property name="salary" type="double"></property>
    
     <many-to-one name="dept" column="dept_id "  class="dept"></many-to-one>

    </class>
    </hibernate-mapping>

}
public void setSalary(double salary) {
    this.salary = salary;
}
public dept getDept() {
    return dept;
}
public void setDept(dept dept) {
    this.dept = dept;
}

}

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <!-- 通常，一个session-factory节点代表一个数据库 -->
    <session-factory>
    
        <!-- 1. 数据库连接配置 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///hib_demo</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property>
        <!-- 
            数据库方法配置， hibernate在运行的时候，会根据不同的方言生成符合当前数据库语法的sql
         -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
        
        
        <!-- 2. 其他相关配置 -->
        <!-- 2.1 显示hibernate在运行时候执行的sql语句 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 2.2 格式化sql -->
        <property name="hibernate.format_sql">true</property>
        
        <!-- 2.3 自动建表  -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        
        <property name="hibernate.current_session_context_class">thread</property>
    
        <mapping resource="cn/itcast/entity/dept.hbm.xml"/>
        <mapping resource="cn/itcast/entity/employee.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

struts.xml

<?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>

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

        <!-- 拦截器配置 -->
        <interceptors>
            <interceptor name="sessioninterceptor" 
            
            class="cn.itcast.interceptor.sessioninterceptor"></interceptor>
            <interceptor-stack name="myStack">
                <interceptor-ref name="defaultStack"></interceptor-ref>
                <interceptor-ref name="sessioninterceptor"></interceptor-ref>
            </interceptor-stack>
        </interceptors>
        <default-interceptor-ref name="myStack"></default-interceptor-ref>
        
        <!-- action配置 -->
        <action name="show" class="cn.itcast.deptaction.deptaction">
            <result name="success">/index.jsp</result>
        </action>

    </package>

</struts>

hibernateutils.java
package cn.itcast.utils;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class hibernateutils {
private static SessionFactory sf;
static{
    sf= new Configuration().configure().buildSessionFactory();
}
public static Session getsession(){
    return sf.getCurrentSession();
}
}

package cn.itcast.interceptor;

import org.hibernate.Session;

import cn.itcast.utils.hibernateutils;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class sessioninterceptor extends AbstractInterceptor {

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
        // TODO Auto-generated method stub
        try {
            Session session=hibernateutils.getsession();
            session.beginTransaction();
            
            
            String result=invocation.invoke();  

//session 在action之前就已经存在  该处可以打断点理解
            
            session.getTransaction().commit();
            return result;
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return "error";
        }

    }

}

public class deptaction extends ActionSupport{

    private deptservice deptservice= new deptservice();
    
    
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        
        dept dept = deptservice.findbyid(4);
        ActionContext.getContext().getContextMap().put("dept",dept );
        return SUCCESS;
    }

}

public class deptdao {
public dept findbyid(int id){
    return  (dept) hibernateutils.getsession().get(dept.class, id);
    
}
}

public class deptservice {
    
    
    private deptdao deptdao= new deptdao();
public dept findbyid(int id){
    return deptdao.findbyid(id);
}
}

index.jsp 

<body>
   <h2>部门：<s:property value="#request.dept.deptname"/></h2>
   <table>
   <tr>
   <td> 员工编号</td>
   <td>员工姓名</td>
   <td>员工薪水</td>
   </tr>
   <s:if test="#request.dept.emps!=null">
   <s:iterator var="emp"  value="#request.dept.emps">
   <tr>
           <td><s:property value="#emp.empid"/></td>
           <td><s:property value="#emp.empname"/></td>
           <td><s:property value="#emp.salary"/></td>
   </tr>
   </s:iterator>
   </s:if>
   <s:else>
   <tr><td colspan="3">没有员工信息</td></tr>
   </s:else>
   
   
   </table>
   
   
   
  </body>
</html>