首先发一下效果图
显示所有用户信息
添加用户信息
删除用户信息
编辑用户信息
下面就来介绍一下easyui的crud,在java中是怎么与后台进行交换的
前台html页面，我将它命名为crud1.html
1.首先是一个datagrid，通过class来标记，
关于url 直接给出官方的解释： To load data from remote server, you should set ‘url’ peoperty, where server will return JSON format data
其次是pagination(分页),它的官方解释是
set ‘pagination’ property to true, which will generate a pagination bar on datagrid bottom. The pagination will send two parameters to server:page: The page number, start with 1.rows: The page rows per page.
接着关于thread官方的解释是 datagrid columns is defined in <thead> markup(datagrid的列是定义在<thread>标记之中的)
2.工具栏
关于工具栏，We don’t need to write any javascript code, attach a toolbar to the datagrid via ‘toolbar’ attribute.
工具栏中通过定义时所写的onclick方法来完成调用。
3.工具栏中定义的方法
方法位于js中，举例，如：newUser这个方法
点击"添加用户"这个工具栏，就会调用js中的newUser()方法
(1)打开 id为dlg的对话框，并且对话框的标题设置为 "添加用户"
$("#dlg").dialog('open').dialog('setTitle','添加用户');
(2)对话框的定义，在body之中是这样定义的，此处不多解释
<div id="dlg" class="easyui-dialog" style="width:400px;height:250px;padding:10px 20px" closed="true" buttons="#dlg-buttons"> <form id="fm" method="post"> <table cellspacing="10px;"> <tr> <td>姓名：</td> <td><input name="name" class="easyui-validatebox" required="true" style="width: 200px;"></td> </tr> <tr> <td>联系电话：</td> <td><input name="phone" class="easyui-validatebox" required="true" style="width: 200px;"></td> </tr> <tr> <td>Email：</td> <td><input name="email" class="easyui-validatebox" validType="email" required="true" style="width: 200px;"></td> </tr> <tr> <td>QQ：</td> <td><input name="qq" class="easyui-validatebox" required="true" style="width: 200px;"></td> </tr> </table> </form></div> <div id="dlg-buttons"><a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-ok" onclick="saveUser()">保存</a><a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-cancel" onclick="javascript:$('#dlg').dialog('close')">关闭</a></div>
(3)清除对话框的内容
$('#fm').form('clear');
(4)通过ajax与后台java程序进行交互
url='userSave';
后台的java程序是这样的
接受用户传进来的四个值，完成数据库的相关操作，然后将result的返回值，放到一个jsonObject之中
public class UserSaveServlet extends HttpServlet{/** * */private static final long serialVersionUID = 1L;DbUtil dbUtil=new DbUtil();UserDao userDao=new UserDao();@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");String name=request.getParameter("name");String phone=request.getParameter("phone");String email=request.getParameter("email");String qq=request.getParameter("qq");String id=request.getParameter("id");User user=new User(name, phone, email, qq);if(StringUtil.isNotEmpty(id)){user.setId(Integer.parseInt(id));}Connection con=null;try {int saveNums=0;con=dbUtil.getCon();JSONObject result=new JSONObject();if(StringUtil.isNotEmpty(id)){saveNums=userDao.userModify(con, user);}else{saveNums=userDao.userAdd(con, user);}if(saveNums==1){result.put("success", "true");}else{result.put("success", "true");result.put("errorMsg", "保存成功");}ResponseUtil.write(response, result);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {dbUtil.closeCon(con);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
好，以上就是完整的easyui和后台java程序的交互过程。
下面贴出完整代码：
项目结构：
数据库建表语句：就是一个t_user表
/*SQLyog 企业版 - MySQL GUI v8.14 MySQL - 5.1.49-community : Database - db_easyui**********************************************************************//*!40101 SET NAMES utf8 */;/*!40101 SET SQL_MODE=''*/;/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;CREATE DATABASE /*!32312 IF NOT EXISTS*/`db_easyui` /*!40100 DEFAULT CHARACTER SET utf8 */;USE `db_easyui`;/*Table structure for table `t_user` */DROP TABLE IF EXISTS `t_user`;CREATE TABLE `t_user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(20) DEFAULT NULL, `phone` varchar(20) DEFAULT NULL, `email` varchar(20) DEFAULT NULL, `qq` varchar(20) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8;/*Data for the table `t_user` */
前台页面 crud1.html
<html><head><meta charset="UTF-8"><title>Basic DataGrid - jQuery EasyUI Demo</title><link rel="stylesheet" type="text/css" href="jquery-easyui-1.3.3/themes/default/easyui.css"><link rel="stylesheet" type="text/css" href="jquery-easyui-1.3.3/themes/icon.css"><link rel="stylesheet" type="text/css" href="jquery-easyui-1.3.3/demo/demo.css"><script type="text/javascript" src="jquery-easyui-1.3.3/jquery.min.js"></script><script type="text/javascript" src="jquery-easyui-1.3.3/jquery.easyui.min.js"></script><script type="text/javascript" src="jquery-easyui-1.3.3/locale/easyui-lang-zh_CN.js"></script><script>var url;function deleteUser(){var row=$('#dg').datagrid('getSelected');if(row){$.messager.confirm("系统提示","您确定要删除这条记录吗?",function(r){if(r){$.post('userDelete',{delId:row.id},function(result){if(result.success){$.messager.alert("系统提示","已成功删除这条记录!");$("#dg").datagrid("reload");}else{$.messager.alert("系统提示",result.errorMsg);}},'json');}});}}function newUser(){$("#dlg").dialog('open').dialog('setTitle','添加用户');$('#fm').form('clear');url='userSave';}function editUser(){var row=$('#dg').datagrid('getSelected');if(row){$("#dlg").dialog('open').dialog('setTitle','编辑用户');$('#fm').form('load',row);url='userSave?id='+row.id;}}function saveUser(){$('#fm').form('submit',{url:url,onSubmit:function(){return $(this).form('validate');},success:function(result){var result=eval('('+result+')');if(result.errorMsg){$.messager.alert("系统提示",result.errorMsg);return;}else{$.messager.alert("系统提示","保存成功");$('#dlg').dialog('close');$("#dg").datagrid("reload");}}});}</script></head><body><table id="dg" title="用户管理" class="easyui-datagrid" style="width:700px;height:365px" url="userList" toolbar="#toolbar" pagination="true" rownumbers="true" fitColumns="true" singleSelect="true"> <thead> <tr> <th field="id" width="50" hidden="true">编号</th> <th field="name" width="50">姓名</th> <th field="phone" width="50">电话</th> <th field="email" width="50">Email</th> <th field="qq" width="50">QQ</th> </tr> </thead> </table> <div id="toolbar"> <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-add" plain="true" onclick="newUser()">添加用户</a> <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-edit" plain="true" onclick="editUser()">编辑用户</a> <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-remove" plain="true" onclick="deleteUser()">删除用户</a> </div><div id="dlg" class="easyui-dialog" style="width:400px;height:250px;padding:10px 20px" closed="true" buttons="#dlg-buttons"> <form id="fm" method="post"> <table cellspacing="10px;"> <tr> <td>姓名：</td> <td><input name="name" class="easyui-validatebox" required="true" style="width: 200px;"></td> </tr> <tr> <td>联系电话：</td> <td><input name="phone" class="easyui-validatebox" required="true" style="width: 200px;"></td> </tr> <tr> <td>Email：</td> <td><input name="email" class="easyui-validatebox" validType="email" required="true" style="width: 200px;"></td> </tr> <tr> <td>QQ：</td> <td><input name="qq" class="easyui-validatebox" required="true" style="width: 200px;"></td> </tr> </table> </form></div> <div id="dlg-buttons"><a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-ok" onclick="saveUser()">保存</a><a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-cancel" onclick="javascript:$('#dlg').dialog('close')">关闭</a></div></body>
model层对user表和pageBean的封装
public class PageBean {private int page; // 第几页private int rows; // 每页的记录数private int start; // 起始页 //省略get和set方法}
public class User {private int id;private String name;private String phone;private String email;private String qq;public User() {}public User(String name, String phone, String email, String qq) {this.name = name;this.phone = phone;this.email = email;this.qq = qq;} //省略get和set方法 }
工具类：
(1)连接数据库的类
public class DbUtil {private String dbUrl="jdbc:mysql://localhost:3306/db_easyui";private String dbUserName="root";private String dbPassword="root";private String jdbcName="com.mysql.jdbc.Driver";public Connection getCon()throws Exception{Class.forName(jdbcName);Connection con=DriverManager.getConnection(dbUrl,dbUserName,dbPassword);return con;}public void closeCon(Connection con)throws Exception{if(con!=null){con.close();}}}
(2)将result转换成json数组的工具类public class JsonUtil {/** * 将result的结果集转化成json数组格式 * @param rs * @return * @throws Exception */public static JSONArray formatRsToJsonArray(ResultSet rs)throws Exception{ResultSetMetaData md=rs.getMetaData();int num=md.getColumnCount();JSONArray array=new JSONArray();while(rs.next()){JSONObject mapOfColValues=new JSONObject();for(int i=1;i<=num;i++){mapOfColValues.put(md.getColumnName(i), rs.getObject(i));}array.add(mapOfColValues);}return array;}}
(3)向页面输出信息的类
public class ResponseUtil {public static void write(HttpServletResponse response,Object o)throws Exception{response.setContentType("text/html;charset=utf-8");PrintWriter out=response.getWriter();out.print(o.toString());out.flush();out.close();}}
下面是控制层controller
删除用户信息的controller
public class UserDeleteServlet extends HttpServlet{/** * */private static final long serialVersionUID = 1L;DbUtil dbUtil=new DbUtil();UserDao userDao=new UserDao();@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// String delId=request.getParameter("delId");String delId=request.getParameter("delId");Connection con=null;try {con=dbUtil.getCon();JSONObject result=new JSONObject();int delNums=userDao.userDelete(con, delId);if(delNums==1){result.put("success", "true");}else{result.put("errorMsg", "删除失败");}ResponseUtil.write(response, result);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {dbUtil.closeCon(con);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}
显示用户信息的controller
public class UserListServlet extends HttpServlet{/** * */private static final long serialVersionUID = 1L;DbUtil dbUtil=new DbUtil();UserDao userDao=new UserDao();@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String page=request.getParameter("page");String rows=request.getParameter("rows");PageBean pageBean=new PageBean(Integer.parseInt(page),Integer.parseInt(rows));Connection con=null;try {con=dbUtil.getCon();JSONObject result=new JSONObject();JSONArray jsonArray=JsonUtil.formatRsToJsonArray(userDao.userList(con, pageBean));int total=userDao.userCount(con);result.put("rows", jsonArray);result.put("total", total);ResponseUtil.write(response, result);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {dbUtil.closeCon(con);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}
保存用户信息的controller
public class UserSaveServlet extends HttpServlet{/** * */private static final long serialVersionUID = 1L;DbUtil dbUtil=new DbUtil();UserDao userDao=new UserDao();@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");String name=request.getParameter("name");String phone=request.getParameter("phone");String email=request.getParameter("email");String qq=request.getParameter("qq");String id=request.getParameter("id");User user=new User(name, phone, email, qq);if(StringUtil.isNotEmpty(id)){user.setId(Integer.parseInt(id));}Connection con=null;try {int saveNums=0;con=dbUtil.getCon();JSONObject result=new JSONObject();if(StringUtil.isNotEmpty(id)){saveNums=userDao.userModify(con, user);}else{saveNums=userDao.userAdd(con, user);}if(saveNums==1){result.put("success", "true");}else{result.put("success", "true");result.put("errorMsg", "保存成功");}ResponseUtil.write(response, result);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{try {dbUtil.closeCon(con);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}
最后附上配置文件web.xml
<servlet> <servlet-name>userListServlet</servlet-name> <servlet-class>com.qzp.web.UserListServlet</servlet-class> </servlet> <servlet> <servlet-name>userDeleteServlet</servlet-name> <servlet-class>com.qzp.web.UserDeleteServlet</servlet-class> </servlet> <servlet> <servlet-name>userSaveServlet</servlet-name> <servlet-class>com.qzp.web.UserSaveServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>userListServlet</servlet-name> <url-pattern>/userList</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>userDeleteServlet</servlet-name> <url-pattern>/userDelete</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>userSaveServlet</servlet-name> <url-pattern>/userSave</url-pattern> </servlet-mapping>
而消极的人则在每个机会都看到某种忧患。
