Learn from the station b springcloud, now summarize the summary removal of a small error appearing in the video, some of the error-prone places were reminded
b outbound links: https://www.bilibili.com/video/av55304977
data link:
https://pan.baidu.com/s/1o0Aju3IydKA15Vo1pP4z5w
extraction code: 21ru
On a link: https://blog.csdn.net/qq_40893824/article/details/103323782
The next section link: https://blog.csdn.net/qq_40893824/article/details/103326409
The following list summarizes: sub-project → pom → application → entity of Student → → handler → Interface and Implementation classes start
Implementation details:
1. Create a maven project --eurekaclient (service provider)
to fill eurekaclient after next
after Finish
visibility successfully created
2. Fill in the code pom file of the project:
Code:
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
3. The creation of application.yml
create success, fill in the code:
server:
port: 8010
spring:
application:
name: provider
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
instance:
prefer-ip-address: true
# 是否将当前服务的 IP 注册到 Eureka Server。
4. Create a startup class:
create com.southwind package is created under java, I do not know see the first article of 8. There say:
https://blog.csdn.net/qq_40893824/article/details/103323782
Create the following southwind start
entering ProviderApplication.java
fill in the code:
package com.southwind;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderApplication.class,args);
}
}
5. Create entity classes: entity → Student
into the Student in
which there is the code @Data, this needs to be added in dependence of the parent pom
<!--下面这个依赖对应于eurekaclient中entity的@Data-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
<scope>provided</scope>
</dependency>
<Scope> provided </ scope> indicates that the provider of the package is only used when compiling and testing
in the tagging Student:
package com.southwind.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
private long id;
private String name;
private int age;
}
6. Create Interface:
Package: repository
name: StudentRepository, its type to an interface type
into the StuentRepository
fill:
package com.southwind.repository;
import com.southwind.entity.Student;
import java.util.Collection;
public interface StudentRepository {
/*增 改*/
public void saveorupdate(Student student);
/*删*/
public void deleteById(long id);
/*查*/
public Collection<Student> findAll();
/*查*/
public Student findById(long id);
}
7. impl create a package at repotory
create --StudentRepositoryImpl StudentRepository implementation classes in the impl
to implement operation of the interface to implements StudentRepository
mouseover StudentRepositoryImpl, alt + after enter, fantastic scene:
entering arrows:
autocomplete Code:
fill in the code:
Do not forget @Repository
package com.southwind.repository.impl;
import com.southwind.entity.Student;
import com.southwind.repository.StudentRepository;
import org.springframework.stereotype.Repository;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
@Repository
public class StudentRepositoryImpl implements StudentRepository{
private static Map<Long,Student> studentMap;
static{
studentMap = new HashMap<>();
studentMap.put(1L,new Student(1L,"张三",12));
studentMap.put(2L,new Student(2L,"李四",22));
studentMap.put(3L,new Student(3L,"王五",15));
}
@Override
public void saveorupdate(Student student) {
studentMap.put(student.getId(),student);
}
@Override
public void deleteById(long id) {
studentMap.remove(id);
}
@Override
public Collection<Student> findAll() {
return studentMap.values();
}
@Override
public Student findById(long id) {
return studentMap.get(id);
}
}
8. Create Handler
created at southwind package Controller
Controller created StudentHandler
fill codes:
package com.southwind.controll;
import com.southwind.entity.Student;
import com.southwind.repository.StudentRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.Collection;
@RestController
@RequestMapping("/student")
public class StudentHandler {
@Autowired
private StudentRepository studentRepository;
/*增 改*/
@PostMapping("/save")
public void save(@RequestBody Student student){
studentRepository.saveorupdate(student);
}
@PutMapping("/update")
public void update(@RequestBody Student student){
studentRepository.saveorupdate(student);
}
/*删*/
@DeleteMapping("/deleteById/{id}")
public void deleteById(@PathVariable("id") long id){
studentRepository.deleteById(id);
}
/*查*/
@GetMapping("/findAll")
public Collection<Student> findAll(){
return studentRepository.findAll();
}
/*查*/
@GetMapping("/findById/{id}")
public Student findById(@PathVariable("id") long id){
return studentRepository.findById(id);
}
}
Open class start
operating normally
enter http: // localhost: 8761
service providers have registered came
into the HTTP: // localhost: 8010 / Student / findAll
9. detailed testing in Postman in
a full investigation get → http:. // localhost: 8010 / Student / findAll
b → Find HTTP GET:. // localhost: 8010 / Student / findById / 3
c into a person's information.
POST → HTTP: // localhost: 8010 / Student / the Save
d have to see. no deposit into
get → http: // localhost: 8010 / student / findAll
successful deposit into!
e updates.
PUT → HTTP: // localhost: 8010 / Student / Update
. f look no updates
get → http: // localhost: 8010 / student / findAll
successfully updated!
On a link: https://blog.csdn.net/qq_40893824/article/details/103323782
The next section link: https://blog.csdn.net/qq_40893824/article/details/103326409
