SpringBoot 实现增删改查

程序员文章站 2022-06-21 14:38:59

创建项目bigdata先加载配置pom.xml

创建项目bigdata

spring 项目
eg
SpringBoot 实现增删改查
操作顺序
1.删除用不到的文件

SpringBoot 实现增删改查
将这个三个删除

2.先将app配置后缀名改为yml
3.然后创建entity这个包
4.创建dao包这是跟数据库打交道的
5.再创建service包
6.创建controllern包
7.现在开始搞pom.xml文件
8.然后配置app.xml

SpringBoot 实现增删改查

先加载配置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>2.3.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.nmgdz</groupId> <artifactId>bigdata</artifactId> <version>0.0.1-SNAPSHOT</version> <name>bigdata</name> <description>init project</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!-- druid数据库连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version> </dependency> <!--lombok依赖--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!--redis依赖配置--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <!--Swagger-UI API文档生产工具--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.7.0</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.7.0</version> </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> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

config包下面
Swagger2Config 配置

package com.nmgdz.bigdata.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import springfox.documentation.builders.ApiInfoBuilder; import springfox.documentation.builders.PathSelectors; import springfox.documentation.builders.RequestHandlerSelectors; import springfox.documentation.service.ApiInfo; import springfox.documentation.spi.DocumentationType; import springfox.documentation.spring.web.plugins.Docket; import springfox.documentation.swagger2.annotations.EnableSwagger2; /**
 作者: xhd
 创建时间: 2020/3/13 17:32
 版本: V1.0
 */ /**
 * Swagger2API文档的配置
 */ @Configuration @EnableSwagger2 public class Swagger2Config { @Bean public Docket createRestApi(){ return new Docket(DocumentationType.SWAGGER_2) .apiInfo(apiInfo()) .select() //为当前包下controller生成API文档 .apis(RequestHandlerSelectors.basePackage("com.nmgdz.bigdata.controller")) //为有@Api注解的Controller生成API文档 //                .apis(RequestHandlerSelectors.withClassAnnotation(Api.class)) //为有@ApiOperation注解的方法生成API文档 //                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class)) .paths(PathSelectors.any()) .build(); } private ApiInfo apiInfo() { return new ApiInfoBuilder() .title("SwaggerUI演示") .description("内蒙古电子大数据工坊") .contact("xhd") .version("1.0") .build(); } }

controller 包
IndexController配置

package com.nmgdz.bigdata.controller; import com.nmgdz.bigdata.entity.User; import com.nmgdz.bigdata.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import java.util.ArrayList; import java.util.List; @Controller public class IndexController { @Autowired private UserService userService; @RequestMapping("/") public String index(ModelMap map) { //加入一个属性,用来在模板中读取 map.addAttribute("host", "内蒙古电子"); //return 模板文件的名称，对应src/main/resources/templates/index.html return "index"; } @RequestMapping("/echarts") public String echarts() { return "echarts"; } @RequestMapping("/echartx") public String echartx(ModelMap map) { List<User> users = userService.queryAll(); List<String> names = new ArrayList<>(); List<Integer> ages = new ArrayList<>(); if (users != null && users.size() > 0) { users.stream().forEach(user -> { names.add(user.getName()); ages.add(user.getAge()); }); } map.addAttribute("names",names); map.addAttribute("ages",ages); return "echartx"; } }

UserController 配置

package com.nmgdz.bigdata.controller; import com.nmgdz.bigdata.entity.User; import com.nmgdz.bigdata.service.RedisService; import com.nmgdz.bigdata.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; /**
 * @auther: xhd
 * @Date: 2020/9/1/11:15
 */ @RestController @RequestMapping("user") public class UserController { @Autowired private UserService userService; @Autowired private RedisService redisService; /**
     * 查询
     *
     * @param id
     * @return
     */ @GetMapping("/queryById") public User queryById(int id) { return userService.queryById(id); } /**
     * 增 改
     * @param user
     * @return
     */ @PostMapping("/saveOrUpdate") public User saveOrUpdateUser(User user) { return userService.save(user); } /**
     * 删除用户
     * @param id
     * @return
     */ @DeleteMapping("/delete") public Boolean deleteUser(int id) { userService.deletUserById(id); return true; } }

在dao包
UserDao配置下

package com.nmgdz.bigdata.dao; import com.nmgdz.bigdata.entity.User; import org.springframework.data.jpa.repository.JpaRepository; import java.util.List; /**
 * 作者: xhd
 * 创建时间: 2020/3/12 19:51
 * 版本: V1.0
 */ public interface UserDao extends JpaRepository<User, Integer> { //List<User> findByAge(int age); User findById(int id); }

在entity包
user配置

package com.nmgdz.bigdata.entity; import lombok.Data; import javax.persistence.*; @Table(name ="cc") @Entity @Data public class User { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; private String name; private Integer age;

在service包下
SpringBoot 实现增删改查
Impl包下
RedisServiceImpl

package com.nmgdz.bigdata.service; /**
 * @auther: xhd
 * @Date: 2020/9/2/0:26
 */ public interface RedisService { /**
     * 存储数据
     */ void set(String key, String value); /**
     * 获取数据
     */ String get(String key); /**
     * 设置超期时间
     */ boolean expire(String key, long expire); /**
     * 删除数据
     */ void remove(String key); /**
     * 自增操作
     *
     * @param delta 自增步长
     */ Long increment(String key, long delta); }

UserServiceImpl

package com.nmgdz.bigdata.service.impl; import com.nmgdz.bigdata.dao.UserDao; import com.nmgdz.bigdata.entity.User; import com.nmgdz.bigdata.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; /**
 * @auther: xhd
 * @Date: 2020/9/1/11:12
 */ @Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; //    @Override //    public List<User> queryByAge(int age) { //        return userDao.findByAge(age); //    } //    @Override //    public List<User> queryByAge(int age) { //        return null; //    } @Override public User save(User user) { return userDao.save(user); } @Override public void deletUserById(int id) { userDao.deleteById(id); } @Override public User queryById(int id) { return userDao.findById(id); } @Override public List<User> queryAll() { return userDao.findAll(); } }

RedisService

package com.nmgdz.bigdata.service; /**
 * @auther: xhd
 * @Date: 2020/9/2/0:26
 */ public interface RedisService { /**
     * 存储数据
     */ void set(String key, String value); /**
     * 获取数据
     */ String get(String key); /**
     * 设置超期时间
     */ boolean expire(String key, long expire); /**
     * 删除数据
     */ void remove(String key); /**
     * 自增操作
     *
     * @param delta 自增步长
     */ Long increment(String key, long delta); }

UserService

package com.nmgdz.bigdata.service; import com.nmgdz.bigdata.entity.User; import java.util.List; /**
 * @auther: xhd
 * @Date: 2020/9/1/11:10
 */ public interface UserService { /**
     * 根据年龄查询用户
     *
     * @param age
     * @return
     */ // List<User> queryByAge(int age); /**
     * 保存用户
     *
     * @param user
     * @return
     */ User save(User user); /**
     * 根据主键删除用户
     *
     * @param id
     */ void deletUserById(int id); /**
     * 根据主键查询
     * @param id
     * @return
     */ User queryById(int id); /**
     * 查询所有
     * @return
     */ List<User> queryAll(); }

BigdataApplication配置下

package com.nmgdz.bigdata; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class BigdataApplication { public static void main(String[] args) { SpringApplication.run(BigdataApplication.class, args); } }

SpringBoot 实现增删改查

在templates下
echarts.html

<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8" /> <title>Spring Boot中使用ECharts</title> <script src="https://cdn.bootcss.com/echarts/4.6.0/echarts.min.js"></script> </head> <body> <div id="main" style="width: 1000px;height:400px;"></div> </body> <script type="text/javascript"> let myChart = echarts.init(document.getElementById('main')); let option = { title: { text: 'Spring Boot中使用ECharts' }, tooltip: {}, xAxis: { data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] }, yAxis: {}, series: [{ data: [820, 932, 901, 934, 1290, 1330, 1320], type: 'line' }]}; // option = { //     xAxis: { //       type: 'category', //        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] //     }, //    yAxis: { //         type: 'value' //     }, //     series: [{ //         data: [120, 200, 150, 80, 70, 110, 130], //         type: 'bar', //         showBackground: true, //        backgroundStyle: { //             color: 'rgba(220, 220, 220, 0.8)' //      } //     }] // }; myChart.setOption(option); </script> </html>

echartx.html

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"/> <title>Title</title> <script src="https://cdn.bootcss.com/echarts/4.6.0/echarts.min.js"></script> </head> <body> <div id="main" style="width: 1000px;height:400px;"></div> </body> <script type="text/javascript" th:inline="javascript"> let myChart=echarts.init(document.getElementById('main')); let option = { title: { text:'Spring Boot中使用ECharts' }, tooltip: {}, xAxis: { type: 'category', data: [[${names}]] }, yAxis: { type: 'value' }, series: [{ data: [[${ages}]], type: 'line' }] }; myChart.setOption(option); </script> </html>

index.html

<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8" /> <title></title> </head> <body> <h1 th:text="${host}">Hello World</h1> </body> </html>

application.yml

spring: datasource: type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useSSL=false&useUnicode=true&characterEncoding=utf-8&autoReconnect=true&serverTimezone=Asia/Shanghai
    username: root
    password: 123456 initialSize: 20 minIdle: 50 maxActive: 500 jpa: hibernate: ddl-auto: update
    show-sql: true redis: host: localhost # Redis服务器地址
    database: 0 # Redis数据库索引（默认为0）
    port: 6379 # Redis服务器连接端口
    password: 123456 # Redis服务器连接密码（默认为空）
    jedis: pool: max-active: 8 # 连接池最大连接数（使用负值表示没有限制）
        max-wait: -1ms # 连接池最大阻塞等待时间（使用负值表示没有限制）
        max-idle: 8 # 连接池中的最大空闲连接
        min-idle: 0 # 连接池中的最小空闲连接
    timeout: 3000ms # 连接超时时间（毫秒）

Test是数据库名字
User 里面的cc是数据库

SpringBoot 实现增删改查

测试方法
SpringBoot 实现增删改查

BigdataApplicationTests

package com.nmgdz.bigdata; import org.junit.jupiter.api.Test; import org.springframework.boot.test.context.SpringBootTest; @SpringBootTest class BigdataApplicationTests { @Test void contextLoads() { } }

RedisTest

package com.nmgdz.bigdata; import com.nmgdz.bigdata.service.RedisService; import lombok.extern.slf4j.Slf4j; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; /**
 * @auther: xhd
 * @Date: 2020/9/2/0:28
 */ @Slf4j @SpringBootTest public class RedisTest { @Autowired private RedisService redisService; //TODO main函数测试 @Test public void testRedis(){ redisService.set("dianzi","123456"); System.out.println("设置得值为---"+redisService.get("dianzi")); } }