如何在REST API中用GET方法检索资源（对象）,在Quarkus中使用date作为@PathParam

Question

我是一个新的编程，我正在尝试建立一个小的饮食跟踪应用程序。我使用quarkus、RESTeasy、JAX-RS和java来构建我的REST API。用户应该能够添加他在一周中几天吃的食物。

用户必须能够根据日期检索他吃过的食物。我的问题是我不能根据日期取回食物。当我使用时间戳：“2021-06-10T08:44:45.9328079Z[UTC]”作为GET方法终点上的输入日期时，我在Postman中得到400个坏请求。当我根据用户ID检索食物时，它工作得很好。

下面是我使用GET和POST方法的代码：

@path（“/foods”）公共类控制器{

public static ArrayList<Object> foods = new ArrayList<>();

@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getAllFood(){
    return Response.ok(foods).build();
}

@POST
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public Response addFood() throws ParseException {

    foods.add(new Food("Garlic", 30, Timestamp.from(Instant.now()), 1));
    foods.add(new Food("Onions", 20, Timestamp.from(Instant.now()), 2));
    return Response.ok(foods).build();

}

@Path("{userId}")
@GET
@Produces(MediaType.APPLICATION_JSON)
public static Response getFoodById(@PathParam("userId") int userId){
    for (Object food : foods){
        if (((Food)food).getUserId()==(userId)){
            return Response.ok(food).build();
        }
    }
    return null;
}

@Path("/second/{time}")
@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getFoodByDate(@PathParam("time") Timestamp time){
    for (Object food : foods){
        if (((Food)food).getTime().toString().equals(time.toString())){
            return Response.ok(food).build();
        }
    }
    return null;
}

}

package org.acme;

private String foodType;
private int portion;
private Timestamp time;
private int userId;

public Food(){}

public Food(String foodType, int portion, Timestamp time, int userId){
    this.foodType = foodType;
    this.portion = portion;
    this.time = time;
    this.userId = userId;

}

public String getFoodType() {
    return foodType;
}

public void setFoodType(String foodType) {
    this.foodType = foodType;
}

public int getPortion() {
    return portion;
}

public void setPortion(int portion) {
    this.portion = portion;
}

public Timestamp getTime() {
    return time;
}

public void setTime(Timestamp time) {
    this.time = time;
}

public int getUserId() {
    return userId;
}

public void setUserId(int userId) {
    this.userId = userId;
}

@Override
public String toString(){
    return foodType + ", " + portion + ", " + time + ", " + userId;
}

}

Answer 1

OK-Postman抛出的错误是400 bad request的原因是由于您的输入参数不正确。

从@PathParam更改为@RequestParam的示例代码

@Path("/get/second/")
@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getFoodByDate(@RequestParam("time") String dateString) throws ParseException{
   ArrayList<Food> foods = new ArrayList<>();
   DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

   Date requestedDate = sdf.parse(dateString);
   for (Object food : foods){
       if (((Food)food).getTime().equals(requestedDate)){
           return Response.ok(food).build();
       }
   }

   return null;
}

在本例中，我将您的时间戳参数更改为java.SQL.timestamp是java.util.date的薄包装器，它允许JDBC API将其标识为SQL时间戳值，因此在本例中不建议使用时间戳。

public class Food {
    private String foodType;
    private int portion;
    private Date time;
    private int userId;

    public Food(){}

    public Food(String foodType, int portion, Date time, int userId){
        this.foodType = foodType;
        this.portion = portion;
        this.time = time;
        this.userId = userId;

    } ... //getter and setter

    DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    Food food1 = new Food("Garlic", 10, sdf.parse("2020-05-01"), 1);
    Food food2 = new Food("Onion", 20, sdf.parse("2020-05-02"), 1);
    Food food3 = new Food("Potato", 30, sdf.parse("2020-05-03"), 1);
    Food food4 = new Food("Tomato", 40, sdf.parse("2020-05-04"), 1);

    ArrayList<Food> foods = new ArrayList<>();
    foods.add(food1);
    foods.add(food2);
    foods.add(food3);
    foods.add(food4);

package org.example;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

public class Main {

    public static void main(String[] args) throws ParseException {

        DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String dateString = "2020-05-01"; //mocking request date from the @RequestParam
        Date requestedDate = sdf.parse(dateString);

        
        Food food1 = new Food("Garlic", 10, sdf.parse("2020-05-01"), 1);
        Food food2 = new Food("Onion", 20, sdf.parse("2020-05-02"), 1);
        Food food3 = new Food("Potato", 30, sdf.parse("2020-05-03"), 1);
        Food food4 = new Food("Tomato", 40, sdf.parse("2020-05-04"), 1);

        ArrayList<Food> foods = new ArrayList<>();
        foods.add(food1);
        foods.add(food2);
        foods.add(food3);
        foods.add(food4);
        
        for (Object food : foods){
            if (((Food)food).getTime().equals(requestedDate)){
                System.out.print(food);
            }
        }

    }
}

产量:大蒜，10,Fri.5月01 00:00:00 SGT,2020,1