struts+hibernate 请求数据库增删改查（小项目实例）

package com.action;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;
import org.omg.CORBA.Request;

import com.dao.StudentDao;
import com.dao.imp.StudentDaoImp;
import com.entity.Student;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class StudentAction extends ActionSupport{
	private StudentDao dao=new StudentDaoImp();
	public StudentDao getDao() {
		return dao;
	}
	public void setDao(StudentDao dao) {
		this.dao = dao;
	}
	
	private int id;
	private String name;
	private String password;
	private String email;
	private String sex;
	private int age;
	private int page=1;
	private Student student=new Student();
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public int getPage() {
		return page;
	}
	public void setPage(int page) {
		this.page = page;
	}
	
	
	
	
	
	
	@Override
	public void validate() {
		// TODO Auto-generated method stub
		if(student.getName()==null||student.getName().trim().equals(""))
		{
			this.addFieldError("name", "姓名不能为空");
		}
		if(student.getPassword()==null||student.getPassword().trim().equals(""))
		{
			this.addFieldError("password", "密码不能为空");
		}
		
	}
	//重写validate（）校验方法




	
	
	public String findStudents(){
		/*耦合方式
		 * HttpServletRequest request=ServletActionContext.getRequest();
		HttpServletResponse response=ServletActionContext.getResponse();
		 */	
		ActionContext ctx=ActionContext.getContext();
		Map request=(Map)ctx.get("request");
		//可以直接拿到session		ctx.getSession();
		//ctx.getApplication();
		List<Student> students=dao.getStudentsByPage("from Student",page);
		//存放到request 属性里面返回前台
		//page已经在配置成属性  不用set前台也能获得到
		request.put("students", students);
		//通过拦截器将其放到attribute里
		/*耦合方式request.setAttribute("students", students);*/
		
		//request.getSession().getServletContext();可以拿到session 
		//servlet中的都可以拿得到
		return "findStudents";
	
	}
	
	public String saveStudent(){
		
		student.setId(id);
		student.setAge(age);
		student.setName(name);
		student.setEmail(email);
		student.setPassword(password);
		student.setSex(sex);
		dao.saveStudent(student);
		return "saveStudent";
	}
	
	
	
	public String deleteStudent(){
		dao.deleteStudent(id);
		return "deleteStudent";
		
	}
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

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

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

   		<action name="student_*" class="com.action.StudentAction" method="{1}">
   			<result name ="saveStudent" type="chain">student_findStudents</result>
   			<!-- action之间的跳转    type="chain"-->
   			<result name ="deleteStudent" type="chain">student_findStudents</result>
   			<result name ="findStudents">/student.jsp</result>
   			<result name="input">/student_add.jsp</result>
   			<!-- 出现错误返回当前页面 -->
	   </action>
   
    </package>



</struts>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

      <include file ="config/student.xml"></include>
   

</struts>

package com.entity;



import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Student{
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	private int id;
	private String name;
	private String password;
	private String email;
	private String sex;
	
	
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	private int age;
	 
	public Student() {
		super();
	}
	public Student(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}
	public String getName() {
		return name;
	}
	 
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
}

package com.dao;

import java.util.List;

import com.entity.Student;

public interface StudentDao {
	public void saveStudent(Student student);
	public void deleteStudent(int id);
	public List<Student> getStudents(String hql);
	public List<Student> getStudentsByPage(String hql,int page) ;
}

package com.dao.imp;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.dao.StudentDao;
import com.entity.Student;
import com.util.HibernateUtils;

public class StudentDaoImp implements StudentDao {
	private  int pageSize=10;
	@Override
	public void saveStudent(Student student) {
		// TODO Auto-generated method stub
		Session session=HibernateUtils.getSession();
		Transaction tx=session.beginTransaction();
		session.saveOrUpdate(student);
		tx.commit();
		HibernateUtils.closeSession(session);
	}

	@Override
	public void deleteStudent(int id) {
		// TODO Auto-generated method stub
		Session session=HibernateUtils.getSession();
		Transaction tx=session.beginTransaction();
//		1.session???
		Student stu=(Student)session.get(Student.class, id);
		session.delete(stu);
		//2.????query??????  session.createQurey(delete from Student where id=??)
		//q.executeUpdate()
		tx.commit();
		HibernateUtils.closeSession(session);
	}

	@Override
	public List<Student> getStudents(String hql) {
		// TODO Auto-generated method stub
		Session session=HibernateUtils.getSession();
		Query q=session.createQuery(hql);
		
		return q.list();
	}
	@Override
	public List<Student> getStudentsByPage(String hql,int page) {
		// TODO Auto-generated method stub
		Session session=HibernateUtils.getSession();
		Query q=session.createQuery(hql);
		int begin=(page-1)*pageSize+1;
		q.setFirstResult(begin-1).setMaxResults(pageSize);
		return q.list();
	}

}