小编Kos*_*asC的帖子

我有以下控制器:

@RestController
public class RestaurantController {
    @Autowired
    RestaurantService restaurantService;
    @RequestMapping(value = "/restaurant/", method = RequestMethod.GET)
    public ResponseEntity<List<Restaurant>> listAllRestaurants() {
        System.out.println("Fetching all restaurants");
        List<Restaurant> restaurants = restaurantService.findAllRestaurants();
        if(restaurants.isEmpty()){
            return new ResponseEntity<List<Restaurant>>(HttpStatus.NO_CONTENT);//You many decide to return HttpStatus.NOT_FOUND
        }
        return new ResponseEntity<List<Restaurant>>(restaurants, HttpStatus.OK);
    }
    @RequestMapping(value = "/restaurant/{id}", method = RequestMethod.PUT)
    public ResponseEntity<Restaurant> updateRestaurant(@PathVariable("id") int id, @RequestBody Restaurant restaurant) {
        System.out.println("Updating Restaurant " + id);

        Restaurant currentRestaurant = restaurantService.findById(id);

        if (currentRestaurant==null) {
            System.out.println("Restaurant with id " + id + " not found");
            return new …

我有一对多的关系,这是我的代码

@Entity
@Table(name = "catalog")
public class Catalog {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "catalog_id")
    private int catalog_id;

    @NotEmpty
    @Size(min = 3, max = 255)
    @Column(name = "name", nullable = false)
    private String name;

    @OneToMany(mappedBy="mycatalogorder")
    private List<Order> orders;

    @OneToMany(mappedBy="mycatalog")
    private List<CatalogItem> items;

    // setters and getters
}

 @Entity
 @Table(name = "catalogitem")
 public class CatalogItem {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "catalogitem_id")
    private int catalogitem_id;

    @NotEmpty
    @Size(min = 3, max = 255)
    @Column(name = "name", nullable = false)
    private …

我只想解析一个简单的时间!这是我的代码:

   String s = "01:19 PM";
        Date time = null;
        DateFormat  parseFormat = new SimpleDateFormat("hh:mm aa");
        try {
            time = parseFormat.parse(s);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

我得到这个例外:

java.text.ParseException: Unparseable date: "01:19 PM"
    at java.text.DateFormat.parse(Unknown Source)

我正在使用改造来为Reddit创建一个Android客户端.在logcat上获取toke工作正常,但是当我试图获取登录用户的信息时,我收到"404 Not Found".这是我的logcat:

D/OkHttp: --> POST https://oauth.reddit.com/api/v1/me http/1.1
D/OkHttp: Content-Length: 0
D/OkHttp: Authorization: bearer myToken
D/OkHttp: User-Agent: MyRedditClient/0.1 by myusername
D/OkHttp: --> END POST
D/OkHttp: <-- 404 Not Found https://oauth.reddit.com/api/v1/me (677ms)

这是我的代码:

import java.io.IOException;

import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class ServiceAuthGenerator {

    public static final String API_BASE_URL = "https://www.reddit.com/";

    private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

    private static Retrofit.Builder builder =
            new Retrofit.Builder()
                    .baseUrl(API_BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create());

    public static <S> S getTokenService(Class<S> …

我在从 Eclipse 项目的另一个包中获取图像时遇到问题！我在这里看到这篇文章 我的代码是这个 CreateTableOnPDF.java：

288    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
289    InputStream input = classLoader.getResourceAsStream("images/sun.png");
290    PDJpeg img = new PDJpeg(doc, input);

我收到此异常：

Exception in thread "main" java.lang.IllegalStateException: 
at org.apache.pdfbox.pdmodel.graphics.xobject.PDJpeg.setPropertiesFromAWT(PDJpeg.java:132)
at org.apache.pdfbox.pdmodel.graphics.xobject.PDJpeg.<init>(PDJpeg.java:113)
at MainClasses.CreateTableOnPDF.main(CreateTableOnPDF.java:290)

我不知道我做错了什么？也许是我的显示器前已经花了很多时间。

这是我的项目结构：

感谢您的关注和时间！

我已经将Set嵌套到我的实体中。这是我的代码：

MyClassA:

@Entity
@Table(name = "aaa")
public class MyClassA {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private int id;

    @NotEmpty
    @Size(min = 3, max = 255)
    @Column(name = "name", nullable = false)
    private String name;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    private Set<MyClassB> mycollection = new HashSet<MyClassB>();

    public MyClassA() {    
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) { …

我想问一下，使用Room Persistence Library是否可以在一个项目下拥有多个数据库？动态更改数据库的选择。谢谢