react+springboot+mybatis

MySQL数据库

建立cat表并存储数据

建立后端

1 点击create new project新建一个项目。

2  点击spring initializr建立springboot项目,点击next


3 填写group和artifact,也可以不修改直接点next

4 点击web,选择web,点击next


5 填写projectName和project location,点击finish。


6 建立的项目目录如图所示


7 配置pom.xml

<?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 http://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>2.1.2.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.example</groupId>

    <artifactId>demo</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>demo</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!-- JSTL (JSP standard Tag Library) JSP 标准标签库 -->

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jstl</artifactId>

        </dependency>

        <dependency>

            <groupId>org.apache.tomcat.embed</groupId>

            <artifactId>tomcat-embed-jasper</artifactId>

            <!-- <scope>provided</scope>-->

        </dependency>

                <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>net.sf.json-lib</groupId>

            <artifactId>json-lib</artifactId>

            <version>2.4</version>

            <classifier>jdk15</classifier>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <optional>true</optional>

        </dependency>

        <!--连接数据库驱动-->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

        </dependency>

        <!--支持通过jdbc连接数据库-->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-jdbc</artifactId>

        </dependency>

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.1.1</version>

        </dependency>

        <dependency>

            <groupId>com.auth0</groupId>

            <artifactId>java-jwt</artifactId>

            <version>3.1.0</version>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

8 配置application.properties(与MySQL数据库相连)

mybatis.mapperLocations=classpath:mapper/*.xml

#端口号server.port=8080

#session失效时间server.session-timeout=30

spring.datasource.url=jdbc:mysql://localhost:3306/mysql?characterEncoding=utf-8&serverTimezone=GMT%2B8

spring.datasource.username=root

spring.datasource.password=123456

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

9 在src中创建包controller、entity、mapper、service、service.impl。在resources中创建包mapper。


userController

package com.example.demo.Controller;

import com.example.demo.entity.User;

import com.example.demo.service.UserService;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;

import java.util.List;

@Controller

@RequestMapping("/user")

public class UserController {

    @Resource

    private UserService userService;

    @ResponseBody

    @RequestMapping("/findAll")

    public List<User> findAll( ) {

        List<User>  list = userService.findAll();

        return list;

    }

    @ResponseBody

    @RequestMapping("/count")

    public int count(){

        int count=userService.count();

        System.out.println(count);

        return count;

    }

}

user:

package com.example.demo.entity;

import java.io.Serializable;

public class User implements Serializable {

    private  Integer  id;

    private  String  name;

    private  Integer age;

    public Integer getId() {

        return id;

    }

    public String getName() {

        return this.name;

    }

    public Integer getAge() {

        return age;

    }

    public void setId(Integer id) {

        this.id = id;

    }

    public void setName(String name) {

        this.name = name;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    public User(){

    }

    public User(int id){

        this.id=id;

    }

    public User(int age, String name){

        this.age=age;

        this.name=name;

    }

    @Override

    public String toString() {

        return super.toString();

    }

}

userMapper:

package com.example.demo.mapper;

import com.example.demo.entity.User;

import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper

public interface UserMapper {

    List<User> findAll();

    int count();

}

userservice

package com.example.demo.service;

import com.example.demo.entity.User;

import java.util.List;

public interface UserService {

    List<User> findAll();

    int count();

}

userserviceImpl

package com.example.demo.service.Impl;

import com.example.demo.entity.User;

import com.example.demo.mapper.UserMapper;

import com.example.demo.service.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import java.util.List;

@Service("UserService")

public class UserServiceImpl implements UserService {

    @Autowired

    private UserMapper userMapper;

    @Override

    public List<User> findAll() {

        List<User> list = userMapper.findAll();

        return list;    }

    @Override

    public int count() {

        int count=userMapper.count();

        return count;

    }

}

userMapper.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.example.demo.mapper.UserMapper">

    <select id="findAll" resultType="com.example.demo.entity.User">

        SELECT * FROM cat

    </select>

    <select id="count" resultType="java.lang.Integer">

        select count(*) from  cat

    </select>

</mapper>

建立前端react:

1  在根目录下建立react项目web


2 建立好的目录如下图所示


在app.js中用ajax取值。

import React, {Component} from 'react';

import './App.css';

import $ from 'jquery';

class App extends Component{

    constructor(props)

    {

        super(props);

        this.state = {

        }

    }

    componentDidMount()

    {

        //先执行Ajax数据请求,全局的get方法

        var  source="/user/findAll";

        this.serverRequest = $.get(source, function (result) {

            alert(result);

            this.setState({

                result

            });

        }.bind(this));

    }

    //组件的render方法

    render()

    {

        let {result=[]}=this.state;

        return (

            <div>

            <div>

            <h1>111111111111</h1>

            </div>

            <div>

            <table className='table'>

        <thead>

        <tr>

        <th>id</th>

        <th>姓名</th>

        </tr>

        </thead>

        <tbody>

        {result.map(({id, name}) =>

        <tr>

        <td>{id}</td>

        <td>{name}</td>

        </tr>

    )}

    </tbody>

    </table>

    </div>

    </div>

    );

    }

}

export default App;

要使用jquery需要先添加,在引用

import $ from'jquery';

要使用后端的数据,需要在package.json中添加

"proxy": "http://localhost:8080"


设置npm

启动前端选start,启动后端选demoApplication,


同时启动后,输入http://localhost:3000/#

显示页面


userMapper显示红线时,需要早fileàsettings中找inspections将autowiring for bean class 中的√取消掉。


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