done 多米诺pizza oa 考了spring boot编程

 还考了oop编程，第一次在stackoverflow上贡献答案：https://stackoverflow.com/questions/52614766/user-moderator-and-admin-with-oop-javascript/53084174

@service = @Component,表示东西
https://www.tutorialspoint.com/spring_boot/spring_boot_service_components.htm
controller service在一个类里面的话，就只定义一个class就行了
测试文件的article不能在主文件中用，主文件自身也要有article

package articles;

import static org.hamcrest.Matchers.*;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
import static org.junit.Assert.*;

import org.junit.Test;
import org.junit.BeforeClass;
import org.junit.Before;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.http.MediaType;

import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.ArrayList;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class ApplicationTest {
    private static List<Article> articles = new ArrayList<Article>();
    private static ArticleService service = new ArticleService();

    @Autowired
    private MockMvc mockMvc;
  
    @BeforeClass 
    public static void populateArticles() {
        articles.add(new Article("10 things that you thought were unhealthy"));
        articles.add(new Article("You won't sleep until you read this"));
        articles.add(new Article("I ran out of catchy titles"));
    }
  
    @Before 
    public void clearDB() {
        this.service.clear();
    }
  
    public void addArticles() {
        for(Article article: articles) {
          this.service.add(article);
        }
    }

    @Test
    public void shouldRetrieveNothingFromEmptyDatabase() throws Exception {
        this.mockMvc.perform(get("/articles"))
            .andExpect(content().contentType(TestUtil.APPLICATION_JSON_UTF8))
                .andExpect(jsonPath("$", hasSize(0)));
    }
  
    @Test
    public void shouldRetrievePostedArticles() throws Exception {
        addArticles();
        this.mockMvc.perform(get("/articles"))
            .andExpect(content().contentType(TestUtil.APPLICATION_JSON_UTF8))
                .andExpect(jsonPath("$", hasSize(articles.size())));
    }
  
    @Test
    public void shouldAllowUsToFindArticles() throws Exception {
        addArticles();
        Article article = this.service.getAll().get(0);
        this.mockMvc.perform(get("/articles/" + article.getId()))
            .andExpect(jsonPath("id", is(article.getId())))
            .andExpect(status().isOk());
    }
  
    public static String asJsonString(final Object obj) {
        try {
            final ObjectMapper mapper = new ObjectMapper();
            final String jsonContent = mapper.writeValueAsString(obj);
            return jsonContent;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }  
}

 答案：

package articles;

    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.HttpStatus;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.server.ResponseStatusException;

    @RestController
    @RequestMapping("/articles")
    public class ArticlesController {

    private final ArticalService articalService;

    @Autowired
    public ArticlesController(ArticalService articalService){
        this.articalService = articalService;
    }

    @GetMapping
    public List<Article>getAll(){
       return articalService.getAll();
    }
    @GetMapping("/{id}")
    public Article findById(@PathVariable int id){
        Article article = articalService.findById(id);

        if(article != null){
            return article;
        }else{
            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "no such article with id:" + id);
        }
    }
}

总之controller就是个协调器，类都在它里面。model,viewer不用改，改controller就行了