ExtJs、Struts2、Hibernate3.2的Grid后台分页

最新推荐文章于 2025-08-14 09:56:16 发布

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最新推荐文章于 2025-08-14 09:56:16 发布

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分类专栏： java 文章标签： hibernate struts extjs myeclipse null encoding

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本文介绍了一个基于Struts2和Hibernate的整合项目案例，包括数据库设计、配置文件设置、DAO层实现、业务逻辑处理及JSON数据交互等内容。

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1、大致思想模型

2、基本配置

2.1、创建数据库test，表student、mark

DROP TABLE IF EXISTS `test`.`student`;
CREATE TABLE  `test`.`student` (
  `stuid` varchar(20) NOT NULL,
  `stuname` varchar(20) NOT NULL,
  `stusex` varchar(20) NOT NULL,
  `stuaddress` varchar(20) NOT NULL,
  PRIMARY KEY (`stuid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

DROP TABLE IF EXISTS `test`.`mark`;
CREATE TABLE  `test`.`mark` (
  `stuid` varchar(20) DEFAULT NULL,
  `stumath` int(11) NOT NULL,
  `stuchinese` int(11) NOT NULL,
  `stuenglish` int(11) NOT NULL,
  KEY `stuid` (`stuid`),
  CONSTRAINT `stuid` FOREIGN KEY (`stuid`) REFERENCES `student` (`stuid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2.2、配置hibernate

项目->点击右键->MyEclipse->Add Hibernate Capabilities...

2.3、配置hibernate.cfg.xml文件（如编码方式、sql在tomcat运行的显示）

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
        <property name="connection.username">root</property>
        <property name="connection.url">
            jdbc:mysql://localhost:3306
        </property>
        <property name="dialect">
            org.hibernate.dialect.MySQLDialect
        </property>
        <property name="myeclipse.connection.profile">mysql</property>
        <property name="connection.password">123</property>
        <property name="connection.driver_class">
            com.mysql.jdbc.Driver
        </property>
        <!-- 数据库方面的sql语句的显示，可省略-->
        <property name="current_session_context_class">thread</property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <!-- 数据库存储方面的字符串格式，不可省略，使传送到数据库的编码是utf-8格式 -->
        <property name="connection.useUnicode">true</property>
        <property name="connection.characterEncoding">UTF-8</property>
    </session-factory>

</hibernate-configuration>

2.4、配置struts2，加入基本包和sturts.xml

commons-fileupload-1.2.1.jar

commons-io-1.3.2.jar

freemarker-2.3.16.jar

javassist-3.7.ga.jar

ognl-3.0.jar

struts2-core-2.2.1.jar

xwork-core-2.2.1.jar

2.5、配置web.xml（与struts2的交互）

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.FilterDispatcher </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>

2.6、配置ExtJs

官网下载:http://www.sencha.com/products/js/

3、创建数据库持久层PO

（见源码）

4、创建数据库访问层DAO

4.1、创建DAO接口

package DAO; import java.util.List; public interface IStudentmarkDAO { public List QueryAll(int start, int limit); public int FindAllRows(); }

4.2、创建DAO实现类

package DAO; import java.util.List; import org.hibernate.Query; import org.hibernate.Session; import HbmFactory.HibernateSessionFactory; public class StudentmarkDAOImpl implements IStudentmarkDAO { public List QueryAll(int start, int limit) { Session session = HibernateSessionFactory.getSession(); session.beginTransaction(); String sql = "select new map(p.stuid as stuid,p.stuname as stuname,p.stusex as stusex,p.stuaddress as stuaddress," + "q.stumath as stumath,q.stuchinese as stuchinese,q.stuenglish as stuenglish) from Student p,Mark q where p.stuid=q.stuid"; Query query = session.createQuery(sql); session.getTransaction().commit(); if (query != null) { return query.setFirstResult(start).setMaxResults(limit).list(); } return null; } public int FindAllRows() { Session session = HibernateSessionFactory.getSession(); session.beginTransaction(); String sql = "select new map(p.stuid as stuid,p.stuname as stuname,p.stusex as stusex,p.stuaddress as stuaddress," + "q.stumath as stumath,q.stuchinese as stuchinese,q.stuenglish as stuenglish) from Student p,Mark q where p.stuid=q.stuid"; Query query = session.createQuery(sql); session.getTransaction().commit(); if (query != null) { return query.list().size(); } return 0; } }

5、创建业务服务层Service

5.1、创建Service的Action控制器接口

package Service; public interface IActionService { public String execute() throws Exception; }

5.2、创建Service实现类

package Service; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import org.apache.struts2.ServletActionContext; import DAO.*; public class StudentmarkServiceImpl implements IActionService { private IStudentmarkDAO studentmark = new StudentmarkDAOImpl(); private int start; private int limit; public int getStart() { return start; } public void setStart(int start) { this.start = start; } public int getLimit() { return limit; } public void setLimit(int limit) { this.limit = limit; } public String execute() throws Exception { HttpServletResponse response = ServletActionContext.getResponse(); // 编制响应的格式 response.setContentType("text/html;charset=UTF-8"); JSONArray json = JSONArray.fromObject(studentmark.QueryAll(getStart(), getLimit())); response.getWriter().write( "{/"totalCount/":" + studentmark.FindAllRows() + ",/"data/":" + json.toString() + "}"); return null; } }

6、创建Action业务控制器

<?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> <package name="Service" extends="struts-default">  <action name="showdata" class="Service.StudentmarkServiceImpl"></action> </package>  </struts>

7、运行效果图