陈旧的开发模式
美工（ui工程师：出一个项目模型）
前端工程师做html页面
java工程师：将原有的html转成jsp，动态展示数据
前后端强依赖，后端必须要等前端的html做好才能套jsp。如果html发生变更，就更痛了，开发效率低
前后端分离
核心思想是前端html页面通过ajax调用后端的restuful api接口并使用json数据进行交互。
前后端约定接口&数据&参数
在开发前约定数据交互的格式。
前后端并行开发（无强依赖，可前后端并行开发，如果需求变更，只要接口&参数不变，就不用两边都修改代码，开发效率高）
美工：只管展示tree_data1.json
案例（easyui）
在同包的位置下创建一个js文件确定数据交互的格式，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"},
{"uid":"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"}
]}
前端代码
jsp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>人员信息维护管理界面</title> <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/static/js/public/easyui5/themes/default/easyui.css"> <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/static/js/public/easyui5/themes/icon.css"> <script type="text/javascript" src="${pageContext.request.contextPath}/static/js/public/easyui5/jquery.min.js"></script> <script type="text/javascript" src="${pageContext.request.contextPath}/static/js/public/easyui5/jquery.easyui.min.js"></script> <script type="text/javascript" src="${pageContext.request.contextPath}/static/js/userManage.js"></script> </head> <body> <!-- 展示的数据 --> <table id="dg"></table> <!-- 弹窗 --> <div id="dd" class="easyui-dialog" title="My Dialog" style="400px;height:200px;" data-options="iconCls:'icon-save',resizable:true,modal:true,closed:true,buttons:'#bb'"> Dialog Content. <!-- 提交的from表单 --> <form id="ff" method="post"> <input type="hidden" name="SerialNo"> <!-- easyui自带一些简单的正则表达式， 也可以在easyui中自定义validType：xxx 这个xxx就代表一种正则 $(function(validType){ }) --> <div> <label for="name">uid:</label> <input class="easyui-validatebox" type="text" name="uid" data-options="required:true" /> </div> <div> <label for="name">uname:</label> <input class="easyui-validatebox" type="text" name="uname" data-options="required:true" /> </div> <div> <label for="name">upwd:</label> <input class="easyui-validatebox" type="text" name="upwd" data-options="required:true" /> </div> </form> <div id="bb"> <a href="#" class="easyui-linkbutton " onclick="ok()">保存</a> <a href="#" class="easyui-linkbutton" >关闭</a> </div> </body> </html>
js代码：
$(function(){ $('#dg').datagrid({ url:$("#ctx").val()+'/userAction.action?methodName=list', fitColumns:true, fit:true, pagination:true, columns:[[ {field:'uid',title:'用户ID',100}, {field:'uname',title:'名称',100}, {field:'upwd',title:'密码',100,align:'right'} ]], toolbar: [{ iconCls: 'icon-edit', handler: function(){ var row=$('#dg').datagrid('getSelected'); $("#zz").attr("data","edit"); if(row){ $('#ff').form('load',row); $('#dd').dialog('open'); } } },'-',{ iconCls: 'icon-add', handler: function(){ var row=$('#dg').datagrid('getSelected'); //修改方法名 $("#zz").attr("data","add"); //清空数据 $('#ff').form('clear'); //打开提示框 $('#dd').dialog('open'); } },'-',{ //删除方法 iconCls: 'icon-remove', handler: function(){ //获取选中的数据 var row=$('#dg').datagrid('getSelected'); $.ajax({ //请求地址与参数传递 url:$("#ctx").val()+'/userAction.action?methodName=remove&SerialNo='+row.SerialNo, success: function(param){ //重新载入页面 $('#dg').datagrid('reload'); } }) } }] }); }) /** * 搜索的方法 * @returns */ function qq(){ //获取文本框的值 var query=$("#qq").val(); $("#dg").datagrid({ url:$("#ctx").val()+'/userAction.action?methodName=query&uname='+query }); } /** * 新增和修改方法 * @returns */ function ok(){ //获取方法名 var a=$("#zz").attr("data"); $('#ff').form('submit', { url:'../userAction.action?methodName='+a, success: function(param){ $('#dd').dialog('close'); $('#dg').datagrid('reload'); $('#ff').form('clear'), $('#dd').dialog('close') } }); }
后端
dao方法：
package com.dao; import java.sql.SQLException; import java.util.List; import java.util.Map; import com.util.JsonBaseDao; import com.util.JsonUtils; import com.util.PageBean; import com.util.StringUtils; public class UserDao extends JsonBaseDao { /** * 修改方法 * @param paMap * @return * @throws NoSuchFieldException * @throws SecurityException * @throws IllegalArgumentException * @throws IllegalAccessException * @throws SQLException */ 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); } /** * 新增方法 * @param paMap * @return * @throws Exception */ public int add(Map<String, String[]> paMap)throws Exception { String sql="insert into t_easyui_user_version2 (uid,uname,upwd) values (?,?,?)"; return super.executeUpdate(sql, new String[] {"uid","uname","upwd"}, paMap); } /** * 删除方法 * @param paMap * @return * @throws Exception */ public int remove(Map<String, String[]> paMap)throws Exception { String sql="delete from t_easyui_user_version2 where SerialNo=?"; return super.executeUpdate(sql, new String[] {"SerialNo"}, paMap); } /** * 查询的方法 * @param paMap * @param pageBean * @return * @throws InstantiationException * @throws IllegalAccessException * @throws SQLException */ public List<Map<String, Object>> query(Map<String, String[]> paMap,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{ String sql="select * from t_easyui_user_version2 where true"; String uname = JsonUtils.getParamVal(paMap, "uname"); if (StringUtils.isNotBlank(uname)) { sql = sql + " and uname like '%" + uname + "%'"; } return super.executeQuery(sql, pageBean); } }
web层：
package com.web; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.dao.UserDao; import com.entity.TreeNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.util.PageBean; import com.util.ResponseUtil; import com.zking.framework.ActionSupport; public class UserAction extends ActionSupport { private UserDao userDao = new UserDao(); /** * datagrid所需数据后端程序员开发完毕 * @param req * @param resp * @return */ public String list(HttpServletRequest req,HttpServletResponse resp){ try { PageBean pageBean=new PageBean(); pageBean.setRequest(req); List<Map<String, Object>> list = this.userDao.query(req.getParameterMap(), pageBean); ObjectMapper om=new ObjectMapper(); //数据格式转换 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; } /** * 查询的请求方法 * @param req * @param resp * @return */ public String query(HttpServletRequest req,HttpServletResponse resp) { try { PageBean pageBean=new PageBean(); pageBean.setRequest(req); List<Map<String, Object>> list = this.userDao.query(req.getParameterMap(), pageBean); ObjectMapper om=new ObjectMapper(); 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: handle exception e.printStackTrace(); } return "index"; } /** * form组件提交所需数据后端程序员处理完毕 * @param req * @param resp * @return */ public String edit(HttpServletRequest req,HttpServletResponse resp){ try { int edit = this.userDao.edit(req.getParameterMap()); ObjectMapper om=new ObjectMapper(); ResponseUtil.write(resp, om.writeValueAsString(edit)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 新增的请求方法 * @param req * @param resp * @return */ public String add(HttpServletRequest req,HttpServletResponse resp){ try { int add = this.userDao.add(req.getParameterMap()); System.out.println("ok"); ObjectMapper om=new ObjectMapper(); ResponseUtil.write(resp, om.writeValueAsString(add)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 删除的请求方法 * @param req * @param resp * @return */ public String remove(HttpServletRequest req,HttpServletResponse resp) { try { int remove=this.userDao.remove(req.getParameterMap()); ObjectMapper om=new ObjectMapper(); ResponseUtil.write(resp, om.writeValueAsString(remove)); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } return null; } }
xml文件配置：
<config> <action path="/menuAction" type="com.web.MenuAction"> </action> <action path="/userAction" type="com.web.UserAction"> <forward name="index" path="/index.jsp" redirect="false"></forward> <forward name="login" path="/login.jsp" redirect="false"></forward> </action> </config>
效果如下：
