Ext4 MVC CRUD操作

项目目录结构如下:

(1)index.html

<!DOCTYPE html>
<html>
    <head>
        <title>用户管理</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link rel="stylesheet" type="text/css" href="ext4/resources/css/ext-all.css">
        <script type="text/javascript" src="ext4/ext-all.js"></script>
        <script type="text/javascript" src="ext4/ext-lang-zh_CN.js"></script>
        <script type="text/javascript" src="app.js"></script>
    </head>
    <body>
    </body>
</html>

(2)app.js

Ext.Loader.setConfig({enabled:true});
 
Ext.application({
    requires: [‘Ext.container.Viewport‘],
    name: ‘AM‘,
   
    appFolder: ‘app‘,
    
    controllers: [
        ‘Users‘
    ],
    
    launch: function(){
        Ext.create(‘Ext.container.Viewport‘,{
            layout: ‘fit‘,
            items: {
                xtype: ‘userlist‘
            }
        });
    }
});

(3)controller/Users.js

Ext.define(‘AM.controller.Users‘, {
    extend: ‘Ext.app.Controller‘,
    
    models:[
        ‘User‘
    ],
    
    stores: [
      ‘Users‘  
    ],
    
    views:[
      ‘user.List‘,
      ‘user.Edit‘,
      ‘user.Add‘
    ],
    
    init: function(){
        this.control({
            ‘viewport > userlist‘: {
                itemdblclick: this.editUser
            },
            ‘useredit button[action=update]‘:{
                click: this.updateUser
            },
            ‘userlist button[action=add]‘:{
                click: this.addUser
            },
            ‘useradd button[action=create]‘:{
                click: this.createUser
            },
            ‘userlist button[action=destroy]‘:{
                click: this.destroyUser
            }
        });
    },
    
    addUser: function(button){
        var view = Ext.widget(‘useradd‘);
        view.show();
    },
    
    createUser: function(button){
        var win = button.up(‘window‘);
        var form = win.down(‘form‘);
        
        Ext.Ajax.request({
            url:‘/extjstest/UserServlet.do‘,
            params: form.getValues(),
            method: ‘POST‘,
            callback: function(options, success, response) {
                if(success){
                    win.close();
                    var responsejson = Ext.JSON.decode(response.responseText);
                    var no = responsejson.no;
                    Ext.Msg.confirm(‘操作结果!‘, responsejson.msg, function(btn) {
                        if (no === ‘1‘ && btn === ‘yes‘) {
                           Ext.widget(‘userlist‘).store.load(); 
                        }
                    });
                }else{
                    Ext.Msg.confirm(‘操作失败!‘, ‘请求超时或网络故障,错误编号:[‘ + response.status + ‘]是否要重新发送?‘, function(btn) {
                        if (btn === ‘yes‘) {
                            Ext.Ajax.request(options);
                        }
                    });
                }
            }
        });
    },
    
    destroyUser: function(button){
      var rowSelectionModel = Ext.widget(‘userlist‘).getSelectionModel();
      if (rowSelectionModel.hasSelection()) {  
          var records = rowSelectionModel.getSelection();
          var len = records.length;
          var idarr = new Array();
          for(var i=0;i<len;i++){
              idarr[i] = records[i].get(‘id‘);
          }
          var idarrjson = Ext.JSON.encode(idarr);//转换成JSON格式
          
          Ext.MessageBox.confirm(‘提示信息‘, ‘<font color=red>您确定删除所选中的信息?</font>‘, showResult);
          function showResult(btn){
              if(btn===‘yes‘){
                    Ext.Ajax.request({
                        url: ‘/extjstest/UserServlet.do‘,
                        params: {
                            oprtype: ‘destroy‘,
                            idarrjson: idarrjson
                        },
                        method: ‘POST‘,
                        callback: function(options, success, response) {
                            if (success) {
                                var responsejson = Ext.JSON.decode(response.responseText);
                                var no = responsejson.no;
                                Ext.Msg.confirm(‘操作结果提醒!‘, responsejson.msg, function(btn) {
                                    if (no === ‘1‘ && btn === ‘yes‘) {
                                        Ext.widget(‘userlist‘).store.load();
                                    }
                                });
                            } else {
                                Ext.Msg.confirm(‘操作失败!‘, ‘请求超时或网络故障,错误编号:[‘ + response.status + ‘]是否要重新发送?‘, function(btn) {
                                    if (btn === ‘yes‘) {
                                        Ext.Ajax.request(options);
                                    }
                                });
                            }
                        }
                    });
                }
          }
      }else{
          Ext.MessageBox.alert(‘信息提示‘, ‘<font color=red>请选择您要删除的行!</font>‘);
      }
    },
    
    editUser: function(grid,record){
        var view = Ext.widget(‘useredit‘);
        view.down(‘form‘).loadRecord(record);
    },
    
    updateUser: function(button){
        var win = button.up(‘window‘);
        var form = win.down(‘form‘);
        
        var record = form.getRecord(); //取出表单关联的 record
        var values = form.getValues(); //取出表单中的值
        
        record.set(values); //把表单值设置到对应的 record
        
        win.close();//关闭窗口
        
        //此种方式更新数据将采用json数据格式把参数发送到服务端,服务端接受此种参数时不能使用
        //传统的request.getParameter()的方式,其参数是通过Request Payload传递给服务端的,
        //服务端只能通过读入request的字符流,通过解析json来获取参数值
        this.getUsersStore().sync();
    }
});

 

(4)model/User.js

Ext.define(‘AM.model.User‘, {
    extend: ‘Ext.data.Model‘,
    fields: [‘id‘,‘name‘,‘email‘]
});

 

(5)store/Users.js

Ext.define(‘AM.store.Users‘, {
    extend: ‘Ext.data.Store‘,
    model: ‘AM.model.User‘,
    autoLoad: true,//Store生成之后会自动让Proxy加载数据
    
    proxy: {
        type: ‘ajax‘,
        api:{
            read: ‘/extjstest/UserServlet.do?oprtype=read‘,
            update: ‘/extjstest/UserServlet.do?oprtype=update‘
        },
        reader: {//reader负责将response解码成store能理解的形式
            type: ‘json‘,
            root: ‘users‘
        }
    }
});

 

(7)view/user/List.js

Ext.define(‘AM.view.user.List‘, {
    extend: ‘Ext.grid.Panel‘,
    alias: ‘widget.userlist‘,
    
    title: ‘用户列表‘,
    columnLines: true,
    loadMask: true,
    
    
    store: ‘Users‘,
    
    selModel: Ext.create(‘Ext.selection.CheckboxModel‘,{ checkOnly :true }),//复选框
    
    
    initComponent: function(){
        this.columns = [
            Ext.create(‘Ext.grid.RowNumberer‘, {text: ‘行号‘, width: 35}),
            {header:‘ID‘, dataIndex:‘id‘, flex:1},
            {header:‘NAME‘, dataIndex:‘name‘, flex:1},
            {header:‘EMAIL‘, dataIndex:‘email‘, flex:1}
        ];
        
        this.dockedItems = [
            {
                xtype: ‘toolbar‘,
                dock: ‘top‘,
                items: [
                    {
                        xtype: ‘button‘,
                        text: ‘添加‘,
                        action:‘add‘
                    },
                    ‘-‘,
                    {
                        xtype: ‘button‘,
                        text: ‘删除‘,
                        action: ‘destroy‘
                    }
                ]
            }  
        ];
        
        this.callParent(arguments);
    }
});

 

(8)view/user/Add.js

Ext.define(‘AM.view.user.Add‘, {
    extend: ‘Ext.window.Window‘,
    alias: ‘widget.useradd‘,
    
    title: ‘添加用户‘,
    layout: ‘fit‘,
    autoShow: true,
    
    initComponent: function(){
        this.items = [
            {
                xtype: ‘form‘,
                items: [
                    {
                        xtype: ‘textfield‘,
                        name: ‘name‘,
                        fieldLabel: ‘名称‘
                    },
                    {
                        xtype: ‘textfield‘,
                        name: ‘email‘,
                        fieldLabel: ‘邮箱‘
                    },
                    {
                        xtype: ‘hidden‘,
                        name: ‘oprtype‘,
                        value: ‘create‘
                    }
                ]
            }
        ];
        
        this.buttons = [
            {
                text: ‘保存‘,
                action: ‘create‘
            },
            {
                text: ‘取消‘,
                scope: this,
                handler: this.close
            }
        ];
        
        this.callParent(arguments);
    }
});

 

(9)view/user/Edit.js

Ext.define(‘AM.view.user.Edit‘, {
    extend: ‘Ext.window.Window‘,
    alias: ‘widget.useredit‘,
    
    title: ‘编辑用户信息‘,
    layout: ‘fit‘,
    autoShow: true,
    
    initComponent: function(){
        this.items = [
            {
                xtype: ‘form‘,
                items: [
                    {
                        xtype: ‘hidden‘,
                        name: ‘id‘
                    },
                    {
                        xtype: ‘textfield‘,
                        name: ‘name‘,
                        fieldLabel: ‘姓名‘
                    },
                    {
                        xtype: ‘textfield‘,
                        name: ‘email‘,
                        fieldLabel: ‘邮箱‘
                    }
                ]
            }  
        ];
        
        this.buttons = [
            {
                text:‘保存‘,
                action:‘update‘
            },
            {
                text: ‘取消‘,
                scope: this,
                handler: this.close
            }
        ];
        
        this.callParent(arguments);
    }
});

 

(10)UserServlet.java

package com.yan.servlet;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author y
 */
public class UserServlet extends HttpServlet {

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        
        String oprtype = request.getParameter("oprtype");
        StringBuilder sb = new StringBuilder();
        
        try (PrintWriter out = response.getWriter()) {
            Gson gson = new Gson();
            switch(oprtype){
                case "read":  
                    sb.append("{\"users\":")
                      .append(gson.toJson(getUserList(), new TypeToken<List<User>>(){}.getType()))
                      .append("}");
                    break;
                case "update":   
                    StringBuilder json = new StringBuilder();
                    String line;
                    BufferedReader reader = request.getReader();
                    while((line=reader.readLine())!=null){
                        json.append(line);
                    }
                    User user = gson.fromJson(json.toString(), User.class);
                    System.out.println("id:"+user.id);
                    System.out.println("name:"+user.name);
                    System.out.println("email:"+user.email);
                    
                    sb.append("{\"no\":\"1\",\"msg\":\"成功\"}");
                    break;
                case "create":
                    System.out.println("name:"+request.getParameter("name"));
                    System.out.println("email:"+request.getParameter("email"));
                    
                    sb.append("{\"no\":\"1\",\"msg\":\"成功\"}");
                    break;
                case "destroy":
                    String idarrjson = request.getParameter("idarrjson");
                    List<String> ids = gson.fromJson(idarrjson, new TypeToken<List<String>>(){}.getType());
                    System.out.println(ids);
                    sb.append("{\"no\":\"1\",\"msg\":\"成功\"}");
                    break;
            }
            
            out.print(sb.toString());
            out.close();
        }
    }

    
    List<User> getUserList(){
        List<User> list = new ArrayList<>();
        User user = new User(100,"张三","[email protected]");
        list.add(user);
        user = new User(101,"李四","[email protected]");
        list.add(user);
        user = new User(102,"王五","[email protected]");
        list.add(user);
        user = new User(103,"王五","[email protected]");
        list.add(user);
        return list;
    }
    
    public static final class User{
        public int id;
        public String name;
        public String email;
        public User(int id,String name,String email){
            this.id = id;
            this.name = name;
            this.email = email;
        }
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }


    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

}

效果图:

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