这篇文章将为大家详细讲解有关怎么写springboot接口 ,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
首先要明白数据的流通方向:
数据的触发是前端请求后端引起的,遵循传统的mvc规范的话 我们需要pojo mapper service
controller 四个层次,Pojo 是于数据库中字段直接对应的
在线搭建一个springboot项目
https://start.spring.io/
其中需要加入的四个依赖
点击确定 把没有用的文件删除 最后保留一下两个:
在此处添加jdk的版本:
开始编写接口实现
pon.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.example</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</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.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> <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> </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> </plugins> </build> </project>
application.yml
spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/test?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai username: root password: 123456 server: port: 8001
持久层:
package com.example.demo.entity; import lombok.Data; @Data public class User { private Integer id; private String name; private String address; private Integer age; private String sex; private String phone; }
这里我们引入了 lombok
不需要写get
和set
方法简化代码
<dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.10</version> <scope>provided</scope> </dependency>
mapper层
package com.example.demo.mapper; import com.example.demo.entity.User; import org.apache.ibatis.annotations.Delete; import org.apache.ibatis.annotations.Select; import org.apache.ibatis.annotations.Update; import org.springframework.transaction.annotation.Transactional; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestBody; import java.util.List; public interface UserMapper { @Select("select * from user") List<User> findAll(); @Update("INSERT INTO `user` (`name`, `address`, `age`, `sex`, `phone`) VALUES (#{name},#{address},#{age},#{sex},#{phone});") @Transactional void save(User user); @Update("update user set name=#{name} , address=#{address}, age=#{age}, sex=#{sex},phone=#{phone} where id =#{id}") @Transactional void updateById(User user); @Delete("delete from user where id =#{id}") @Transactional void deleteById(Long id); @Select("select * from user where id =#{id}") User findById(Long id); @Select("select * from user limit #{offset},#{pageSize}") List<User> findByPage(Integer offset, Integer pageSize); @Select("select count(id) from user") Integer countUser(); }
controller
package com.example.demo.controller; import com.example.demo.entity.User; import com.example.demo.mapper.UserMapper; import com.example.demo.vo.Page; import org.apache.ibatis.annotations.Delete; import org.springframework.web.bind.annotation.*; import javax.annotation.Resource; import java.util.List; @RestController @RequestMapping("/user") public class UserController { @Resource UserMapper userMapper; @GetMapping public List<User> getUser() { return userMapper.findAll(); } @PostMapping public String addUser(@RequestBody User user){ //把前端传过来的数据转化为user实体类的对象插入到数据库中 userMapper.save(user); return "success"; } @PutMapping public String updateUser(@RequestBody User user){ userMapper.updateById(user); return "success"; } @DeleteMapping("/{id}") //一一对相应的关系 public String deleteUser(@PathVariable("id") Long id){ //注解是循序json回传带有id userMapper.deleteById(id); return "success"; } @GetMapping("/{id}") //把返回的结果 返回出来 包装成一个user对象 public User findById(@PathVariable("id") Long id){ //注解是循序json回传带有id return userMapper.findById(id); } @GetMapping("/page") public Page<User> findByPage(@RequestParam(defaultValue = "1") Integer pageNum, @RequestParam(defaultValue = "10") Integer pageSize) { Integer offset = (pageNum - 1) * pageSize; List<User> userData = userMapper.findByPage(offset, pageSize); Page<User> page = new Page<>(); page.setData(userData); Integer total = userMapper.countUser(); page.setTotal(total); page.setPageNum(pageNum); page.setPageSize(pageSize); return page; } }
注意 :在实现过程中需要抓启动类中添加 扫描mapper的注解
以前就是对接口的增删改查 和分页查询的实现
实现过程:
快速写出插入语句
插入实现 模拟前端想后端发送json
数据
更新测试:
删除实现:
删除是要注意 id的一一对应
分页查询:
分页查询 参数1 第几页 参数2 一页有多少个数据
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