如何通过使用日期作为 Quarkus 中的 @PathParam 在 REST API 中使用 GET METHOD 检索资源对象

问题描述

我是编程新手，我正在尝试构建一个小型饮食跟踪应用程序。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的几天吃的食物。

用户必须能够根据日期检索他吃过的食物。我的问题是我无法根据日期检索食物。当我使用时间戳：“2021-06-10T08:44:45.9328079Z[UTC]”作为 GET 方法端点的输入日期时，我在邮递员中收到 400 BAD REQUEST。当我根据 userId 检索食物时，它工作正常。

这是我的 GET 和 POST 方法代码：

@Path("/食物") 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",20,2));
    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;
}

}

这是食品类：

package org.acme;

导入 java.sql.Timestamp;

公共课食品{

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;
}

}

解决方法

好的 - Postman 抛出的错误是 400 bad request 的原因是你的输入参数不正确。

示例代码从 @PathParam 更改为 @RequestParam

@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，我更改了您的时间戳参数，因为 java.sql.Timestamp 是 java.util.Date 的薄包装器，允许 JDBC API 将其识别为 SQL TIMESTAMP 值，因此在本例中不建议使用时间戳。

重构 Food 类的示例。

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

将食物添加到数组列表的示例代码。

    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);

我测试的完整源代码：

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",1);
        Food food2 = new Food("Onion",1);
        Food food3 = new Food("Potato",1);
        Food food4 = new Food("Tomato",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);
            }
        }

    }
}

输出：Garlic,Fri May 01 00:00:00 SGT 2020,1