springcloud call service learning class 3--

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/103324622
next section link:
https://blog.csdn.net/qq_40893824/article/details/103327911

The following list summarizes: → entity sub-project of Student → handler → startup class

There are two sections to explain the front, then I will write to streamline some of the
implementation details:
1. Create a module project resttemplate, java create packages com.southwind.entity under
the Student copy to the next entity
under 2.southwind create a startup class RestTemplateApplication
fill enter the code:

package com.southwind;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class RestTemplateApplication {
    public static void main(String[] args) {
        SpringApplication.run(RestTemplateApplication.class,args);
    }

    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
    /*14-17行对应controller/ReatHandler中RestTemplate调用服务*/
}

Under 3.java record bag controller, which create RestHandler
filling the code:

package com.southwind.controller;

import com.southwind.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

import java.util.Collection;

@RestController
@RequestMapping("/rest")
public class RestHandler {

    @Autowired
    private RestTemplate restTemplate;

    /*增 改*/
    @PostMapping("/save")
    public void save(@RequestBody Student student){
        restTemplate.postForEntity("http://localhost:8010/student/save",student,null);
    }

    @PutMapping("/update")
    public void update(@RequestBody Student student){
        restTemplate.put("http://localhost:8010/student/update",student);
    }

    /*删*/
    @DeleteMapping("/deleteById/{id}")
    public void deleteById(@PathVariable("id")long id){
        restTemplate.delete("http://localhost:8010/student/deleteById/{id}",id);
    }

    /*查*/
    @GetMapping("/findAll")
    public Collection<Student> findAll(){
        return restTemplate.getForObject("http://localhost:8010/student/findAll",Collection.class);
    }

    @GetMapping("/findAll2")
    public Collection<Student> findAll2(){
        return restTemplate.getForEntity("http://localhost:8010/student/findAll",Collection.class).getBody();
    }

    /*查*/
    @GetMapping("/findById/{id}")
    public Student findById(@PathVariable("id")long id){
        return restTemplate.getForObject("http://localhost:8010/student/findById/{id}",Student.class,id);
    }

    @GetMapping("/findById2/{id}")
    public Student findById2(@PathVariable("id")long id){
        return restTemplate.getForEntity("http://localhost:8010/student/findById/{id}",Student.class,id).getBody();
    }
}

4. Turn on the startup class

results:

run successfully, you can see the port is 8080, because there is no write configuration class application, so the default is port 8080

5. Test:
A enters HTTP:. // localhost: 8080 / REST / the findAll

B into the HTTP:. // localhost: 8080 / REST / findAll2

C into the HTTP:. // localhost: 8080 / REST / the findById /. 1

D. enter HTTP: // localhost: 8080 / REST / findById2 /. 1

6. The entering Postman
A full search get → http:. // localhost: 8080 / rest / the findAll

B full search get → http:. // localhost: 8080 / rest / findAll2

. C → query HTTP GET: // localhost: 8080 / REST / the findById /. 3

D → GET HTTP:. // localhost: 8080 / REST / findById2 / 2

E stored data.
POST → HTTP: // localhost: 8080 / REST / Save

F inspection.
GET → HTTP: // localhost: 8080 / REST / findAll2

G updating data.
PUT → HTTP: // localhost: 8080 / REST / update

H check.
GET → HTTP: // localhost: 8080 / rest / findAll

i delete the data.
the Delete → HTTP: // localhost: 8080 / REST / deleteById / 4
check:
GET → HTTP: // localhost: 8080 / REST / findAll

check and correct!
On a link:
https://blog.csdn.net/qq_40893824/article/details/103324622
next section link:
https://blog.csdn.net/qq_40893824/article/details/103327911