微信小程序——后台交互

后台准备

pom.xml

配置数据源

整合mtbatis

前后端交互

method1

method2

后台准备

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zking</groupId>
    <artifactId>minoa</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>minoa</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <fastjson.version>1.2.70</fastjson.version>
        <jackson.version>2.9.8</jackson.version>
    </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.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.1</version>
        </dependency>
 
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
 
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
 
    </dependencies>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
 
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <dependencies>
                    <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>${mysql.version}</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>
        </plugins>
    </build>
 
</project>

配置数据源

spring:
  datasource:
    #type连接池类型 DBCP,C3P0,Hikari,Druid,默认为Hikari
    type: com.zaxxer.hikari.HikariDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis_oapro?useUnicode=true&characterEncoding=UTF-8&useSSL=false
    username: root
    password: 123456

生成mapper接口、model实体类以及mapper映射文件

整合mtbatis

mybatis:
  mapper-locations: classpath*:mapper/*.xml #指定mapper文件位置
  type-aliases-package: com.zking.minoa.model #指定自动生成别名所在包

启动类

@MapperScan("com.zking.minoa.mapper") //指mapper接口所在包

然后启动后台即可

前后端交互

method1

首先在index.js中编写以下方法

  loadMeetingInfo(){
    let that=this;
    wx.request({
        url: api.IndexUrl,
        dataType: 'json',
        success(res) {
          console.log(res)
          that.setData({
              lists:res.data.data.infoList
          })
        }
      })
  },

然后在该页面下方生命周期函数——监听页面加载代码块下编写以下方法

  onLoad(options) {
    this.loadMeetingInfo();//首页会议信息
  },

由于后台是没有数据图片的，我们则需要在前端传入一张图片

index.wxml

<image class="video-img" mode="scaleToFill" src="{{item.image != null ? item.image : '/static/persons/1.jpg'}}"></image>

method2

封装request

utils/util.js

const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()
 
  return `${[year, month, day].map(formatNumber).join('/')} ${[hour, minute, second].map(formatNumber).join(':')}`
}
 
const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : `0${n}`
}
 
/**
 * 封装微信的request请求
 */
function request(url, data = {}, method = "GET") {
  return new Promise(function (resolve, reject) {
    wx.request({
      url: url,
      data: data,
      method: method,
      header: {
        'Content-Type': 'application/json',
      },
      success: function (res) {
        if (res.statusCode == 200) {
            resolve(res.data);//会把进行中改变成已成功
        } else {
          reject(res.errMsg);//会把进行中改变成已失败
        }
      },
      fail: function (err) {
        reject(err)
      }
    })
  });
}
 
module.exports = {
  formatTime,request
}

在index.js的头部引用util

const util = require("../../utils/util.js")

编写方法

咱们先把method1的代码注释，再写method2,编写代码如下

loadMeetingInfo(){
    util.request(api.IndexUrl).then(res=>{
      this.setData({
        lists:res.data.infoList
      })
    });
    // let that=this;
    // wx.request({
    //     url: api.IndexUrl,
    //     dataType: 'json',
    //     success(res) {
    //       console.log(res)
    //       that.setData({
    //           lists:res.data.data.infoList
    //       })
    //     }
    //   })
  },

效果展示