本文详细介绍使用EasyUI实现前后端分离的开发模式，包括页面布局、数据交互、增删改查操作及代码示例。
Easyui(三)之高级控件
说到easyui我们就不得不了解一下，easyui过去与现在的两种开发模式
以前的开发模式：
美工（ui工程师：出一个项目模型）
java工程师：将原有的html转成jsp，动态展示数据
缺点：
客户需要调节前端的展示效果
解决：由美工去重新排版，重新选色，java工程师工程师再次去转换完成
前后端分离
美工、java工程师都是独立工作的，彼此之间在开发过程中是没有任何交际。
在开发前约定数据交互的格式。
java工程师的工作：写方法返回数据如tree_data1.json
美工：只管展示tree_data1.json
而我们今天就将easyui前后端分离
首先我们先写一个前端jsp页面并且在前台进行简单的
增删查改
案列事列如下：
{"total":28,"rows":[
{"uid":"FI-SW-01","uname":"Koi","upwd":10.00,"status":"P","listprice":36.50,"attr1":"Large","itemid":"EST-1"},
{"uid":"K9-DL-01","uname":"Dalmation","upwd":12.00,"status":"P","listprice":18.50,"attr1":"Spotted Adult Female","itemid":"EST-10"},
{"uid":"RP-SN-01","uname":"Rattlesnake","upwd":12.00,"status":"P","listprice":38.50,"attr1":"Venomless","itemid":"EST-11"},
{"uid":"RP-SN-01","uname":"Rattlesnake","upwd":12.00,"status":"P","listprice":26.50,"attr1":"Rattleless","itemid":"EST-12"},
{"uid":"RP-LI-02","uname":"Iguana","upwd":12.00,"status":"P","listprice":35.50,"attr1":"Green Adult","itemid":"EST-13"},
{"uid":"FL-DSH-01","uname":"Manx","upwd":12.00,"status":"P","listprice":158.50,"attr1":"Tailless","itemid":"EST-14"},
{"uid":"FL-DSH-01","uname":"Manx","upwd":12.00,"status":"P","listprice":83.50,"attr1":"With tail","itemid":"EST-15"},
{"productlid":"FL-DLH-02","uname":"Persian","upwd":12.00,"status":"P","listprice":23.50,"attr1":"Adult Female","itemid":"EST-16"},
{"uid":"FL-DLH-02","uname":"Persian","upwd":12.00,"status":"P","listprice":89.50,"attr1":"Adult Male","itemid":"EST-17"},
{"uid":"AV-CB-01","uname":"Amazon Parrot","upwd":92.00,"status":"P","listprice":63.50,"attr1":"Adult Male","itemid":"EST-18"}
]}
jsp前台页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath }/static/js/easyui5/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath }/static/js/easyui5/themes/icon.css">
<script type="text/javascript" src="${pageContext.request.contextPath }/static/js/easyui5/jquery.min.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath }/static/js/easyui5/jquery.easyui.min.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath }/static/js/userManger.js"></script>
</head>
<body>
<!-- 展示数据 -->
<table id="dg"></table>
<input type="text" id="ctx" value="${pageContext.request.contextPath }">
<!-- 弹出框提交表单所用 -->
<div id="dd" class="easyui-dialog" title="编辑窗体" style="width:400px;height:200px;"
data-options="iconCls:'icon-save',resizable:true,modal:true,closed:true,buttons:'#bb'">
<form id="ff" method="post">
<input type="hidden" id="a">
<input type="hidden" name="SerialNo">
<div>
<label for="uid">uid:</label>
<input class="easyui-validatebox" type="text" name="uid" data-options="required:true" />
</div>
<div>
<label for="uname">uname:</label>
<input class="easyui-validatebox" type="text" name="uname" data-options="required:true" />
</div>
<div>
<label for="upwd">upwd:</label>
<input class="easyui-validatebox" type="text" name="upwd" data-options="required:true" />
</div>
</form>
</div>
<div id="bb">
<a href="#" class="easyui-linkbutton" onclick="ok()">保存</a>
<a href="#" class="easyui-linkbutton">关闭</a>
</div>
<!--左下反方按钮-->
<!-- <div id="tb">
<a href="#" class="easyui-linkbutton" data-options="iconCls:'icon-edit',plain:true"/a>
<a href="#" class="easyui-linkbutton" data-options="iconCls:'icon-help',plain:true"/a>
</div> -->
</body>
</html>
js页面
$(function(){
$('#dg').datagrid({
url:$("#ctx").val()+'/userAction.action?methodName=list',
fitColumns:true,//把行填充满
fit:true,//列填充
pagination:true,//是分页
columns:[[ //field的值是与数据库保持一致
{field:'uid',title:'代码',width:100},
{field:'uname',title:'名称',width:100},
{field:'upwd',title:'价格',width:100,align:'right'}
]],
toolbar: [{
//修改增删改的图标
iconCls: 'icon-edit',
handler: function(){
var row=$('#dg').datagrid('getSelected');
if(row){
//调用edit的方法
$("#a").val("edit");
//数据回显
$('#ff').form('load',row);
$('#dd').dialog('open');
}
}
},'-',{
iconCls: 'icon-add',
handler: function(){
//清楚表单内容
$('#ff').form('clear');
//调用增加方法
$("#a").val("add");
$('#dd').dialog('open');
}
},'-',{
iconCls: 'icon-remove',
handler: function(){
//无论选中几个 只选中表单的第一行
var row=$('#dg').datagrid('getSelected');
if(row){
$.ajax({
//绝对路径 加上我要调用的路径 再加上我选中的第一行的id值
url:$("#ctx").val()+'/userAction.action?methodName=del&&SerialNo='+row.SerialNo,
success: function(param){
$('#dg').datagrid('reload');
}
});
}
}
}]
});
})
//连接dao方法的函数
function ok(){
$('#ff').form('submit', {
//绝对路径加上我们要要调用方法的路径 加上jsp隐藏域传的值
url:$("#ctx").val()+'/userAction.action?methodName='+$("#a").val(),
success: function(param){
$('#dg').datagrid('reload');
$('#ff').form('clear');
$('#dd').dialog('close');
}
});
}
写好了页面接下来我们就来写dao方法
JsonBaseDao
public class UserDao extends JsonBaseDao {
/**
* 登录查询用户表 登录
* @return
* @throws SQLException
* @throws IllegalAccessException
* @throws InstantiationException
*/
public List<Map<String, Object>> list(Map<String, String[]> paMap,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
String sql="select * from t_easyui_user_version2 where true";
String uid=JsonUtils.getParamVal(paMap, "uid");
String upwd=JsonUtils.getParamVal(paMap, "upwd");
if(StringUtils.isNotBlank(uid)) {
sql=sql+" and uid = "+uid;
}
if(StringUtils.isNotBlank(upwd)) {
sql=sql+" and upwd = "+upwd;
}
return super.executeQuery(sql, pageBean);
}
/**
* 通过中间表 查询登录所对应的权限
* @param paMap
* @param pageBean
* @return
* @throws InstantiationException
* @throws IllegalAccessException
* @throws SQLException
*/
public List<Map<String, Object>> listMenu(String uid,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
String sql="select * from t_easyui_usermenu where true";
if(StringUtils.isNotBlank(uid)) {
sql=sql+" and uid = "+uid;
}
return super.executeQuery(sql, pageBean);
}
/**
* 修改
* @param paMap
* @return
* @throws SQLException
* @throws IllegalAccessException
* @throws IllegalArgumentException
* @throws SecurityException
* @throws NoSuchFieldException
*/
public int edit(Map<String, String[]>paMap) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
String sql="update t_easyui_user_version2 set uid=?,uname=?,upwd=? where serialno=?";
return super.executeUpdate(sql, new String[] {"uid","uname","upwd","SerialNo"}, paMap);
}
/**
* 增加
* @param paMap
* @return
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws SQLException
*/
public int add(Map<String, String[]>paMap) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
String sql="insert into t_easyui_user_version2 (uid,uname,upwd) value(?,?,?)";
return super.executeUpdate(sql, new String[] {"uid","uname","upwd"}, paMap);
}
/**
* 删除
* @param paMap
* @return
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws SQLException
*/
public int del(Map<String, String[]>paMap) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
String sql="delete from t_easyui_user_version2 where SerialNo=?";
return super.executeUpdate(sql, new String[] {"SerialNo"}, paMap);
}
}
接下来我们再写一个处理器降低耦合度
ActionSupport
public class UserAction extends ActionSupport {
private UserDao userDao=new UserDao();
//传两个参数并且动态调用
public String login(HttpServletRequest req,HttpServletResponse resp) {
try {
List<Map<String, Object>> list = this.userDao.list(req.getParameterMap(), null);
if(list!=null&&list.size()>0) {
List<Map<String, Object>> listMenu = this.userDao.listMenu(req.getParameter("uid"), null);
StringBuffer sb=new StringBuffer();
for (Map<String, Object> map : listMenu) {
sb.append(","+map.get("menuId"));
}
//,001,002
req.setAttribute("menuHid", sb.substring(1));
}else {
return "login";
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "index";
}
/**
* datagrid所需数据后台程序员开发完毕
* 从数据库查找数据
* @param req
* @param resp
* @return
*/
public String list(HttpServletRequest req,HttpServletResponse resp) {
try {
PageBean pageBean =new PageBean();
//pageBean 的初始化
pageBean.setRequest(req);
List<Map<String, Object>> list = this.userDao.list(req.getParameterMap(), pageBean);
ObjectMapper om=new ObjectMapper();
//把数据库的值转化成json可以识别的
Map<String, Object> map=new HashMap<>();
map.put("total", pageBean.getTotal());
map.put("rows", list);
ResponseUtil.write(resp, om.writeValueAsString(map));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//form组件所需数据后台程序员处理完毕
/**从数据库修改数据
* 调用ok
* @param req
* @param resp
* @return
*/
public String edit(HttpServletRequest req,HttpServletResponse resp) {
try {
int edit=this.userDao.edit(req.getParameterMap());
ObjectMapper om=new ObjectMapper();
//param相当于
ResponseUtil.write(resp, om.writeValueAsString(edit));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//相当于Aja不需要页面的跳转
return null;
}
/**增加
* 调用ok
* @param req
* @param resp
* @return
*/
public String add(HttpServletRequest req,HttpServletResponse resp) {
try {
int add=this.userDao.add(req.getParameterMap());
ObjectMapper om=new ObjectMapper();
//param相当于
ResponseUtil.write(resp, om.writeValueAsString(add));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//相当于Aja不需要页面的跳转
return null;
}
public String del(HttpServletRequest req,HttpServletResponse resp) {
try {
int del=this.userDao.del(req.getParameterMap());
ObjectMapper om=new ObjectMapper();
//param相当于
ResponseUtil.write(resp, om.writeValueAsString(del));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//相当于Aja不需要页面的跳转
return null;
}
}
页面展示如下：
//把花花改为花花宇宙第一美
接下来我们再增加一个宇宙第二美
通过对比图发现我们增加成功
我们再来删除宇宙第一美
删除成功页面上没有花花宇宙第一美啦
扫一扫
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