近日学习Easyui,发现非常好用,界面很美观。将学习的心得在此写下,这篇博客写SSh结合Easyui实现Datagrid的分页显示,其他的例如添加、修改、删除、批量删除等功能将在后面一一写来。
首先看一下要实现的效果:当每页显示5行数据:
当每页显示10行数据,效果如下:
具体步骤:
1、下载Easyui,并搭建环境。
2、搭建SSH工程,整个工程的目录结构如图所示:
3、在Oracle数据库中创建表Student。并且输入下面6行数据,因为添加操作还没有实现,所以先在数据库表中添加数据。默认设定的值是每行5个数据,所以请至少输入6行数据,便于分页的测试。
4、web.xml的配置
<?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\"> <!-- Sttuts2过滤器 --> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 监听器Spring --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 定位applicationContext.xml的物理位置 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> </web-app>
5、applicationContext.xml的配置
<?xml version=\"1.0\" encoding=\"UTF-8\"?> <beans xmlns=\"http://www.springframework.org/schema/beans\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:context=\"http://www.springframework.org/schema/context\" xmlns:aop=\"http://www.springframework.org/schema/aop\" xmlns:tx=\"http://www.springframework.org/schema/tx\" xsi:schemaLocation=\"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd\"> <import resource=\"applicationContext_bean.xml\"/> <import resource=\"applicationContext_db.xml\"/> </beans>
6、在com.model中创建模型类Student.Java
package com.model; public class Student { String studentid;// 主键 String name;// 姓名 String gender;// 性别 String age;// 年龄 public String getStudentid() { return studentid; } public void setStudentid(String studentid) { this.studentid = studentid; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } }
7、根据Student.java生成对应的映射文件Student.hbm.xml
<?xml version=\"1.0\"?> <!DOCTYPE hibernate-mapping PUBLIC \"-//Hibernate/Hibernate Mapping DTD 3.0//EN\" \"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\"> <!-- Generated 2013-6-23 23:31:47 by Hibernate Tools 3.4.0.CR1 --> <hibernate-mapping> <class name=\"com.model.Student\" table=\"STUDENT\"> <id name=\"studentid\" type=\"java.lang.String\"> <column name=\"STUDENTID\" /> <generator class=\"assigned\" /> </id> <property name=\"name\" type=\"java.lang.String\"> <column name=\"NAME\" /> </property> <property name=\"gender\" type=\"java.lang.String\"> <column name=\"GENDER\" /> </property> <property name=\"age\" type=\"java.lang.String\"> <column name=\"AGE\" /> </property> </class> </hibernate-mapping>
8、编写接口StudentService.java
package com.service; import java.util.List; public interface StudentService { public List getStudentList(String page,String rows) throws Exception;//根据第几页获取,每页几行获取数据 public int getStudentTotal() throws Exception;//统计一共有多少数据 }
9、编写接口的实现类StudentServiceImpl.java
package com.serviceImpl; import java.util.List; import org.hibernate.SessionFactory; import com.service.StudentService; public class StudentServiceImpl implements StudentService { private SessionFactory sessionFactory; // 根据第几页获取,每页几行获取数据 public List getStudentList(String page, String rows) { //当为缺省值的时候进行赋值 int currentpage = Integer.parseInt((page == null || page == \"0\") ? \"1\": page);//第几页 int pagesize = Integer.parseInt((rows == null || rows == \"0\") ? \"10\": rows);//每页多少行 List list = this.sessionFactory.getCurrentSession().createQuery(\"from Student\") .setFirstResult((currentpage - 1) * pagesize).setMaxResults(pagesize).list(); return list; } // 统计一共有多少数据 public int getStudentTotal() throws Exception { return this.sessionFactory.getCurrentSession().find(\"from Student\").size(); } public SessionFactory getSessionFactory() { return sessionFactory; } public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } }
10、配置连接数据库的配置文件applicationContext_db.xml
<?xml version=\"1.0\" encoding=\"UTF-8\"?> <beans xmlns=\"http://www.springframework.org/schema/beans\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:context=\"http://www.springframework.org/schema/context\" xmlns:aop=\"http://www.springframework.org/schema/aop\" xmlns:tx=\"http://www.springframework.org/schema/tx\" xsi:schemaLocation=\"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd\"> <!-- 用Bean定义数据源 --> <bean id=\"dataSource\" class=\"com.mchange.v2.c3p0.ComboPooledDataSource\" destroy-method=\"close\"> <!-- 定义数据库驱动 --> <property name=\"driverClass\"> <value>oracle.jdbc.driver.OracleDriver</value> </property> <!-- 定义数据库URL --> <property name=\"jdbcUrl\"> <value>jdbc:oracle:thin:@localhost:1521:orcl</value> </property> <!-- 定义数据库的用户名 --> <property name=\"user\"> <value>lhq</value> </property> <!-- 定义数据库的密码 --> <property name=\"password\"> <value>lhq</value> </property> <property name=\"minPoolSize\"> <value>1</value> </property> <property name=\"maxPoolSize\"> <value>40</value> </property> <property name=\"maxIdleTime\"> <value>1800</value> </property> <property name=\"acquireIncrement\"> <value>2</value> </property> <property name=\"maxStatements\"> <value>0</value> </property> <property name=\"initialPoolSize\"> <value>2</value> </property> <property name=\"idleConnectionTestPeriod\"> <value>1800</value> </property> <property name=\"acquireRetryAttempts\"> <value>30</value> </property> <property name=\"breakAfterAcquireFailure\"> <value>true</value> </property> <property name=\"testConnectionOnCheckout\"> <value>false</value> </property> </bean> <!--定义Hibernate的SessionFactory --> <bean id=\"sessionFactory\" class=\"org.springframework.orm.hibernate3.LocalSessionFactoryBean\"> <!-- 定义SessionFactory必须注入dataSource --> <property name=\"dataSource\"> <ref bean=\"dataSource\" /> </property> <!-- 定义Hibernate的SessionFactory属性 --> <property name=\"hibernateProperties\"> <props> <prop key=\"hibernate.dialect\"> org.hibernate.dialect.Oracle10gDialect </prop> </props> </property> <!-- 定义POJO的映射文件 --> <property name=\"mappingResources\"> <list> <value>com/model/Student.hbm.xml</value> </list> </property> </bean> <!-- 配置事务拦截器 --> <bean id=\"transactionManager\" class=\"org.springframework.orm.hibernate3.HibernateTransactionManager\"> <property name=\"sessionFactory\" ref=\"sessionFactory\" /> </bean> <tx:advice id=\"txAdvice\" transaction-manager=\"transactionManager\"> <tx:attributes> <tx:method name=\"save*\" propagation=\"REQUIRED\" /><!-- 只有一save、delete、update开头的方法才能执行增删改操作 --> <tx:method name=\"delete*\" propagation=\"REQUIRED\" /> <tx:method name=\"update*\" propagation=\"REQUIRED\" /> <tx:method name=\"*\" propagation=\"SUPPORTS\" read-only=\"true\" /><!-- 其他方法为只读方法 --> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id=\"interceptorPointCuts\" expression=\"execution(* com.serviceImpl..*.*(..))\" /> <!-- 对应实现类接口的包的位置 --> <aop:advisor advice-ref=\"txAdvice\" pointcut-ref=\"interceptorPointCuts\" /> </aop:config> </beans>
11、在控制层编写StudentAction.java类型
package com.action; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONObject; import org.apache.log4j.Logger; import org.apache.struts2.ServletActionContext; import com.service.StudentService; public class StudentAction { static Logger log = Logger.getLogger(StudentAction.class); private JSONObject jsonObj; private String rows;// 每页显示的记录数 private String page;// 当前第几页 private StudentService student_services;//String依赖注入 //查询出所有学生信息 public String getAllStudent() throws Exception { log.info(\"查询出所有学生信息\"); List list = student_services.getStudentList(page, rows); this.toBeJson(list,student_services.getStudentTotal()); return null; } //转化为Json格式 public void toBeJson(List list,int total) throws Exception{ HttpServletResponse response = ServletActionContext.getResponse(); HttpServletRequest request = ServletActionContext.getRequest(); JSONObject jobj = new JSONObject();//new一个JSON jobj.accumulate(\"total\",total );//total代表一共有多少数据 jobj.accumulate(\"rows\", list);//row是代表显示的页的数据 response.setCharacterEncoding(\"utf-8\");//指定为utf-8 response.getWriter().write(jobj.toString());//转化为JSOn格式 log.info(jobj.toString()); } public StudentService getStudent_services() { return student_services; } public void setStudent_services(StudentService student_services) { this.student_services = student_services; } public void setJsonObj(JSONObject jsonObj) { this.jsonObj = jsonObj; } public void setRows(String rows) { this.rows = rows; } public void setPage(String page) { this.page = page; } }
12、编写spring的依赖注入applicationContext_bean.xml配置文件
<?xml version=\"1.0\" encoding=\"UTF-8\"?> <beans xmlns=\"http://www.springframework.org/schema/beans\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:context=\"http://www.springframework.org/schema/context\" xmlns:aop=\"http://www.springframework.org/schema/aop\" xmlns:tx=\"http://www.springframework.org/schema/tx\" xsi:schemaLocation=\"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd\"> <!-- 业务层Service --> <bean id=\"student_service\" class=\"com.serviceImpl.StudentServiceImpl\"> <property name=\"sessionFactory\"> <ref bean=\"sessionFactory\"></ref> </property> </bean> <!-- 控制层Action --> <bean id=\"student_action\" class=\"com.action.StudentAction\"> <property name=\"student_services\"> <ref bean=\"student_service\" /> </property> </bean> </beans>
13、编写struts.xml配置文件
<?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=\"Easyui\" extends=\"json-default\"> <!-- 学生信息 --> <action name=\"getAllStudentAction\" class=\"student_action\" method=\"getAllStudent\"> <result type=\"json\"> </result> </action> </package> </struts>
14、编写JSP----index.jsp
<%@ page language=\"java\" pageEncoding=\"utf-8\" isELIgnored=\"false\"%> <% String path = request.getContextPath(); %> <%@ taglib prefix=\"s\" uri=\"/struts-tags\"%> <!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\"> <html> <head> <meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"> <title>数字框</title> <!-- 引入Jquery --> <script type=\"text/javascript\" src=\"<%=path%>/js/easyui/jquery-1.8.0.min.js\" charset=\"utf-8\"></script> <!-- 引入Jquery_easyui --> <script type=\"text/javascript\" src=\"<%=path%>/js/easyui/jquery.easyui.min.js\" charset=\"utf-8\"></script> <!-- 引入easyUi国际化--中文 --> <script type=\"text/javascript\" src=\"<%=path%>/js/easyui/locale/easyui-lang-zh_CN.js\" charset=\"utf-8\"></script> <!-- 引入easyUi默认的CSS格式--蓝色 --> <link rel=\"stylesheet\" type=\"text/css\" href=\"<%=path%>/js/easyui/themes/default/easyui.css\" /> <!-- 引入easyUi小图标 --> <link rel=\"stylesheet\" type=\"text/css\" href=\"<%=path%>/js/easyui/themes/icon.css\" /> <script type=\"text/javascript\"> $(function() { $(\'#mydatagrid\').datagrid({ title : \'datagrid实例\', iconCls : \'icon-ok\', width : 600, pageSize : 5,//默认选择的分页是每页5行数据 pageList : [ 5, 10, 15, 20 ],//可以选择的分页集合 nowrap : true,//设置为true,当数据长度超出列宽时将会自动截取 striped : true,//设置为true将交替显示行背景。 collapsible : true,//显示可折叠按钮 toolbar:\"#tb\",//在添加 增添、删除、修改操作的按钮要用到这个 url:\'getAllStudentAction.action\',//url调用Action方法 loadMsg : \'数据装载中......\', singleSelect:true,//为true时只能选择单行 fitColumns:true,//允许表格自动缩放,以适应父容器 //sortName : \'xh\',//当数据表格初始化时以哪一列来排序 //sortOrder : \'desc\',//定义排序顺序,可以是\'asc\'或者\'desc\'(正序或者倒序)。 remoteSort : false, frozenColumns : [ [ { field : \'ck\', checkbox : true } ] ], pagination : true,//分页 rownumbers : true//行数 }); }); </script> </head> <body> <h2> <b>easyui的DataGrid实例</b> </h2> <table id=\"mydatagrid\"> <thead> <tr> <th data-options=\"field:\'studentid\',width:100,align:\'center\'\">学生学号</th> <th data-options=\"field:\'name\',width:100,align:\'center\'\">姓名</th> <th data-options=\"field:\'gender\',width:100,align:\'center\'\">性别</th> <th data-options=\"field:\'age\',width:100,align:\'center\'\">年龄</th> </tr> </thead> </table> </body> </html>
15、启动程序,输入http://localhost:8080/easyui/index.jsp进行测试。
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