jt-day04

jt_day04.png

1.Ajax總結

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>您好Springboot</title>

<!-- 1.導入函數類庫 -->
<script src="../js/jquery-3.4.1.min.js"></script>
<script type="text/javascript">
    
    //讓JS頁面加載完成,以後執行JS
    $(function(){
        
        /* 
            
            需求: 利用ajax方式動態獲取user數據信息
            請求網址:  /findAjax
            知識點:  
                返回值類型: 能夠根據數據自動匹配類型,因此能夠不寫.
                1. $.get(url地址,傳遞的參數,回調函數,返回值類型)
                2. $.post(.....)
                3. $.getJSON(.....)
         */
        $.get("/findAjax2",function(result){
            //1.能夠使用js中的for循環
            /* for(let i=0; i<result.length;i++){
                
            } */
            
            /* for(let index in result){
                console.log(index);
            } */
        
            for(let user of result){
                let id = user.id;
                let name = user.name;
                let age = user.age;
                let sex = user.sex;
                let tr  = "<tr align='center'><td>"+id+"</td><td>"+name+"</td><td>"+age+"</td><td>"+sex+"</td></tr>"
                $("#tab1").append(tr);
            }
        })
        
        /* 
            原生ajax寫法   $.ajax變形 jQuery的編程特色: 函數式編程
            需求:傳遞Id=100,name=喵
            參數寫法1:data : {"id":100,"name":"喵"}
            參數寫法2:data: "id=100&name=喵",
        */
        $.ajax({
            url : "/findAjax",
            type : "get",            //method: "post"
            //data : {"id":100,"name":"喵"}
            data: "id=100&name=喵",
            success: function(result){
                for(let user of result){
                    let id = user.id;
                    let name = user.name;
                    let age = user.age;
                    let sex = user.sex;
                    let tr  = "<tr align='center'><td>"+id+"</td><td>"+name+"</td><td>"+age+"</td><td>"+sex+"</td></tr>"
                    $("#tab1").append(tr);
                }
            },
            error: function(result){
                alert("請求失敗,請聯繫管理員!!!")
            },
            cache: false,            //默認值 true
            async: false            //默認值 true 異步操做  false同步操做
        });
    })
</script>


</head>
<body>
    <table id="tab1"  border="1px" width="65%" align="center">
        <tr>
            <td colspan="6" align="center"><h3>學生信息</h3></td>
        </tr>
        <tr>
            <th>編號</th>
            <th>姓名</th>
            <th>年齡</th>
            <th>性別</th>
        </tr>
    </table>
</body>
</html>

2.京淘項目後端搭建

2.1 項目準備

一、建立父級工程jt(pom.xml)javascript

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.jt</groupId>
    <artifactId>jt2007</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!--1.設定打包方式 爲聚合工程-->
    <packaging>pom</packaging>

    <!--2.統一管理jar包-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <java.version>1.8</java.version>
        <skipTests>true</skipTests>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--spring整合mybatis-plus -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>

        <!--springBoot整合JSP添加依賴  -->
        <!--servlet依賴 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>

        <!--jstl依賴 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <!--使jsp頁面生效 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>

        <!--添加httpClient jar包 -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>

        <!--引入dubbo配置 -->
        <!--<dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.0</version>
        </dependency>-->

        <!--添加Quartz的支持 -->
        <!--<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-quartz</artifactId>
        </dependency>-->

        <!-- 引入aop支持 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <!--spring整合redis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
        </dependency>
    </dependencies>

    <!--
        注意事項: 聚合工程自己不須要發佈,因此不要添加 build標籤
    -->

</project>

2.建立工具API jt-common(是jt的子項目--pom.xml--導入課前資料)html

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>jt2007</artifactId>
        <groupId>com.jt</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>jt-common</artifactId>
</project>

3.建立jt-manage項目(是jt的子項目--pom.xml--導入課前資料)【打包方式: war包】java

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <artifactId>jt-manage</artifactId>
    <!--1.web項目打成war包-->
 <packaging>war</packaging>
    <!--2.繼承父級項目-->
 <parent>
        <artifactId>jt2007</artifactId>
        <groupId>com.jt</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <!--3.依賴工具API-->
 <dependencies>
        <dependency>
            <groupId>com.jt</groupId>
            <artifactId>jt-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <!--4.添加maven插件-->
 <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

ymlmysql

server:
  port: 8091
 servlet:
    context-path: /
spring:
  datasource:
    #引入druid數據源
#    type: com.alibaba.druid.pool.DruidDataSource
#    driver-class-name: com.mysql.jdbc.Driver
 url: jdbc:mysql://127.0.0.1:3306/jtdb?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
    username: root
    password: 123456
  mvc:
    view:
      prefix: /WEB-INF/views/
      suffix: .jsp
#mybatis-plush配置
mybatis-plus:
  type-aliases-package: com.jt.pojo
  mapper-locations: classpath:/mybatis/mappers/*.xml
  configuration:
    map-underscore-to-camel-case: true
logging:
  level: 
    com.jt.mapper: debug

1)### 修改啓動項
說明: SpringBoot項目中若是用戶採用缺省值訪問時,則SpringBoot會採用模板工具API進行頁面跳轉. 若是使用模板工具API則會動態的拼接視圖解析器的前綴和後綴
eg:
前綴: /WEB-INF/views/
後綴 .jsp
默認系統歡迎頁面的全路徑: /WEB-INF/views/index.jspjquery

2.2 京淘後臺頁面結構說明

頁面.pngjt_day04.png
1.京淘後端頁面佈局說明(樹形結構)
image.png程序員

2.通用頁面跳轉實現web

package com.jt.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class IndexController {
    /*@RequestMapping("/index")
    public String index(){
        return "index";
    }*/

    /**
     * 需求:實現通用頁面跳轉
     *  url: /page/item-add    頁面:item-add.jsp
     *  url: /page/item-list   頁面:item-list.jsp
     * 結論: url中的地址就是跳轉的頁面信息.
     *
     * restFul風格實現1:
     *     做用: 能夠動態的接收url中的參數
     *     語法:
     *          1.url中的地址若是是參數,則須要使用/分割
     *          2.controller方法接收參數時,須要使用{}號方式獲取
     *          3.若是須要獲取參數信息,則使用特定的註解標識
     *
     * restFul風格實現2: 須要指定訪問的請求類型,而且根據特定的類型執行業務
     *      請求類型:
     *          1.get    執行查詢操做
     *          2.post   執行入庫操做
     *          3.put    執行更新操做
     *          4.delete 執行刪除操做
     */
   //@RequestMapping(value = "/page/{moduleName}",method = RequestMethod.GET)
    @GetMapping("/page/{moduleName}")
    public String module(@PathVariable String moduleName){
        return moduleName;
    }
}

3.UI框架-表格數據展示說明(核心: JS中須要什麼數據,則後端程序員就封裝什麼數據!!)
1)### 常見縮寫介紹ajax

1.  POJO 與數據庫映射的實體類對象
2.  VO : 數據展示層的對象 主要與頁面JS進行數據交互的媒介

2)### EasyUI表格定義redis

<div>
            定義表格,而且經過url訪問json數據, fitColumns:true表示自動適應,singleSelect:true 表示選中單個
            <table class="easyui-datagrid" style="width:500px;height:300px"
                   data-options="url:'datagrid_data.json',method:'get',
                   fitColumns:true,singleSelect:false,pagination:true">
                <thead> 
                    <tr> 
                        <th data-options="field:'code',width:100">Code</th> 
                        <th data-options="field:'name',width:100">Name</th> 
                        <th data-options="field:'price',width:100,align:'right'">Price</th>
                    </tr> 
                </thead> 
            </table> 
        </div>

3)### 表格數據返回格式說明spring

{
    "total":2000,
    "rows":[
        {"code":"A","name":"果汁","price":"20"},
        {"code":"B","name":"漢堡","price":"30"},
        {"code":"C","name":"雞柳","price":"40"},
        {"code":"D","name":"可樂","price":"50"},
        {"code":"E","name":"薯條","price":"10"},
        {"code":"F","name":"麥旋風","price":"20"},
        {"code":"G","name":"套餐","price":"100"}
    ]
}

4)### 根據返回值 定義VO對象
image.png

5)JSON結構說明

JSON概述:
    JSON(JavaScript Object Notation) 是一種輕量級的數據交換格式。
JSON格式之對象格式
    eg: {「id」:「100」,「name」:「tomcat貓」}
JSON格式之數組格式
    eg: [「1」,「玩」,「學習」]
JSON格式之嵌套格式
["敲代碼","打遊戲",[1,2,3,4,5],{"id":100,"name":"tomcat貓","hobby":["吃東西","打豆豆","玩聯盟"]}]
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