标签：student Spring studentMap Boot id 初识 Student import public
Spring Boot
Spring Boot 是一个快速开发框架，可以迅速搭建出一套基于Spring框架体系的应用，是Spring Cloud的基础，Spring Boot开启了各种自动装配，从而简化了代码的开发，不需要编写各种配置文件，只要引入相关依赖就可以迅速搭建一个应用。
- 特点
- 不需要web.xml
- 不需要springmvc.xml
- 不需要tomcat,Spring Boot内嵌了tomcat
- 不需要配置JSON解析，支持REST架构
- 个性化的配置非常简单
- 如何使用
- 创建maven工程，导入相关依赖
1 <?xml version="1.0" encoding="UTF-8"?> 2 <project xmlns="http://maven.apache.org/POM/4.0.0" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5 <modelVersion>4.0.0</modelVersion> 6 7 <groupId>com.wiggin</groupId> 8 <artifactId>aispringboot</artifactId> 9 <version>1.0-SNAPSHOT</version> 10 11 <!-- 继承父包 --> 12 <parent> 13 <groupId>org.springframework.boot</groupId> 14 <artifactId>spring-boot-starter-parent</artifactId> 15 <version>2.0.7.RELEASE</version> 16 </parent> 17 <dependencies> 18 <!-- web启动的jar包 --> 19 <dependency> 20 <groupId>org.springframework.boot</groupId> 21 <artifactId>spring-boot-starter-web</artifactId> 22 <version>2.3.2.RELEASE</version> 23 </dependency> 24 <dependency> 25 <groupId>org.projectlombok</groupId> 26 <artifactId>lombok</artifactId> 27 <version>1.18.12</version> 28 </dependency> 29 30 </dependencies> 31 </project> |
- 创建Student实体类
1 package com.wiggin.entity; 2 3 import lombok.Data; 4 5 @Data 6 public class Student { 7 private long id; 8 private String name; 9 private int age; 10 } |
- 创建StudentRepository功能仓
1 package com.wiggin.repository; 2 3 import com.wiggin.entity.Student; 4 5 import java.util.Collection; 6 import java.util.List; 7 8 public interface StudentRepository { 9 public Collection<Student> findAll(); 10 public Student findById(long id); 11 public void saveOrUpdate(Student student); 12 public void deleteById(long id); 13 } |
- 创建StudentRepositoryImpl功能仓实现类实体类
1 package com.wiggin.repository.impl; 2 3 import com.wiggin.entity.Student; 4 import com.wiggin.repository.StudentRepository; 5 import org.springframework.stereotype.Repository; 6 7 import java.util.Collection; 8 import java.util.HashMap; 9 import java.util.List; 10 import java.util.Map; 11 12 @Repository 13 public class StudentRepositoryImpl implements StudentRepository { 14 private static Map<Long,Student> studentMap; 15 static { 16 studentMap = new HashMap<>(); 17 studentMap.put(1L,new Student(1L,"张三",22)); 18 studentMap.put(2L,new Student(2L,"李四",23)); 19 studentMap.put(3L,new Student(3L,"王五",24)); 20 } 21 @Override 22 public Collection<Student> findAll() { 23 return studentMap.values(); 24 } 25 26 @Override 27 public Student findById(long id) { 28 return studentMap.get(id); 29 } 30 31 @Override 32 public void saveOrUpdate(Student student) { 33 studentMap.put(student.getId(),student); 34 } 35 36 @Override 37 public void deleteById(long id) { 38 studentMap.remove(id); 39 } 40 } |
- 创建StudentRepositoryImpl功能仓实现类实体类
1 package com.wiggin.repository.impl; 2 3 import com.wiggin.entity.Student; 4 import com.wiggin.repository.StudentRepository; 5 import org.springframework.stereotype.Repository; 6 7 import java.util.Collection; 8 import java.util.HashMap; 9 import java.util.List; 10 import java.util.Map; 11 12 @Repository 13 public class StudentRepositoryImpl implements StudentRepository { 14 private static Map<Long,Student> studentMap; 15 static { 16 studentMap = new HashMap<>(); 17 studentMap.put(1L,new Student(1L,"张三",22)); 18 studentMap.put(2L,new Student(2L,"李四",23)); 19 studentMap.put(3L,new Student(3L,"王五",24)); 20 } 21 @Override 22 public Collection<Student> findAll() { 23 return studentMap.values(); 24 } 25 26 @Override 27 public Student findById(long id) { 28 return studentMap.get(id); 29 } 30 31 @Override 32 public void saveOrUpdate(Student student) { 33 studentMap.put(student.getId(),student); 34 } 35 36 @Override 37 public void deleteById(long id) { 38 studentMap.remove(id); 39 } 40 } |
- 创建StudentHandler控制器
1 package com.wiggin.controller; 2 3 import com.wiggin.entity.Student; 4 import com.wiggin.repository.StudentRepository; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.web.bind.annotation.*; 7 8 import java.util.Collection; 9 10 @RestController 11 @RequestMapping("/student") 12 public class StudentHandler { 13 @Autowired 14 private StudentRepository studentRepository; 15 16 @GetMapping("/findAll") 17 public Collection<Student> findAll(){ 18 return studentRepository.findAll(); 19 } 20 @GetMapping("/findById/{id}") 21 public Student findById(@PathVariable long id){ 22 return studentRepository.findById(id); 23 } 24 @PostMapping("/save") 25 public void save(@RequestBody Student student){ 26 studentRepository.saveOrUpdate(student); 27 } 28 @PostMapping("/update") 29 public void update(@RequestBody Student student){ 30 studentRepository.saveOrUpdate(student); 31 } 32 @DeleteMapping("/delete/{id}") 33 public void deleteById(@PathVariable long id){ 34 studentRepository.deleteById(id); 35 } 36 } |
- 创建Application启动类
1 package com.wiggin; 2 3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.SpringBootApplication; 5 6 // Application文件要在所有类的上级 7 @SpringBootApplication 8 public class Application { 9 public static void main(String[] args) { 10 SpringApplication.run(Application.class,args); 11 } 12 } |
注意：启动类一定要放在所有功能类文件的上级，这样才能被扫描。
- 创建application.yml更改接口地址
1 server: 2 port: 9090 |
注意：层与层之间要有缩进的不同，以反映层级关系。
1 private static Map<Long,Student> studentMap;
2 static {
3 studentMap = new HashMap<>();
4 studentMap.put(1L,new Student(1L,"张三",22));
5 studentMap.put(2L,new Student(2L,"李四",23));
6 studentMap.put(3L,new Student(3L,"王五",24));
7 }
8 @Override
9 public Collection<Student> findAll() {
10 return studentMap.values();
11 }
12
13 @Override
14 public Student findById(long id) {
15 return studentMap.get(id);
16 }
17
18 @Override
19 public void saveOrUpdate(Student student) {
20 studentMap.put(student.getId(),student);
21 }
22
23 @Override
24 public void deleteById(long id) {
25 studentMap.remove(id);
26 }
标签：student,Spring,studentMap,Boot,id,初识,Student,import,public 来源： https://www.cnblogs.com/wigginess/p/13454933.html
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