java查询接口需求分析文档

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mob64ca12d74a10 2024-06-17 03:12:18 ©著作权

文章标签 List Travel java 文章分类 Java 后端开发

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Java查询接口需求分析文档

1. 引言

在软件开发过程中，查询接口是一个非常重要的功能模块。它可以实现对数据的快速检索和处理，提高系统的效率和用户体验。本文将根据实际需求分析文档，介绍Java查询接口的设计与实现。

2. 需求分析

根据需求文档，我们需要设计一个查询接口，实现对旅行信息的搜索功能。用户可以根据不同的条件（如目的地、出发时间、价格等）进行筛选，然后显示符合条件的旅行信息。

3. 设计与实现

3.1 类图设计

classDiagram
    class Travel {
        -id: int
        -destination: String
        -startDate: Date
        -price: double
        +Travel(id:int, destination:String, startDate:Date, price:double)
        +getId():int
        +getDestination():String
        +getStartDate():Date
        +getPrice():double
    }
    class TravelSearch {
        -travels: List<Travel>
        +TravelSearch()
        +searchByDestination(destination: String): List<Travel>
        +searchByStartDate(startDate: Date): List<Travel>
        +searchByPrice(price: double): List<Travel>
    }
    Travel *-- TravelSearch

在类图中，我们定义了Travel类和TravelSearch类。Travel类表示旅行信息，包括id、目的地、出发时间和价格等属性。TravelSearch类用于实现查询功能，包含了根据目的地、出发时间和价格等条件进行搜索的方法。

3.2 代码实现

import java.util.Date;

public class Travel {
    private int id;
    private String destination;
    private Date startDate;
    private double price;

    public Travel(int id, String destination, Date startDate, double price) {
        this.id = id;
        this.destination = destination;
        this.startDate = startDate;
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public String getDestination() {
        return destination;
    }

    public Date getStartDate() {
        return startDate;
    }

    public double getPrice() {
        return price;
    }
}

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

public class TravelSearch {
    private List<Travel> travels;

    public TravelSearch() {
        travels = new ArrayList<>();
        // 假设有一些旅行信息已经存在
        travels.add(new Travel(1, "Paris", new Date(), 1000.0));
        travels.add(new Travel(2, "Tokyo", new Date(), 1500.0));
    }

    public List<Travel> searchByDestination(String destination) {
        List<Travel> result = new ArrayList<>();
        for (Travel travel : travels) {
            if (travel.getDestination().equals(destination)) {
                result.add(travel);
            }
        }
        return result;
    }

    public List<Travel> searchByStartDate(Date startDate) {
        List<Travel> result = new ArrayList<>();
        for (Travel travel : travels) {
            if (travel.getStartDate().equals(startDate)) {
                result.add(travel);
            }
        }
        return result;
    }

    public List<Travel> searchByPrice(double price) {
        List<Travel> result = new ArrayList<>();
        for (Travel travel : travels) {
            if (travel.getPrice() <= price) {
                result.add(travel);
            }
        }
        return result;
    }
}

3.3 示例演示

public class Main {
    public static void main(String[] args) {
        TravelSearch search = new TravelSearch();

        // 根据目的地搜索
        List<Travel> parisTravels = search.searchByDestination("Paris");
        for (Travel travel : parisTravels) {
            System.out.println("Destination: " + travel.getDestination() + ", Price: " + travel.getPrice());
        }

        // 根据价格搜索
        List<Travel> cheapTravels = search.searchByPrice(1200.0);
        for (Travel travel : cheapTravels) {
            System.out.println("Destination: " + travel.getDestination() + ", Price: " + travel.getPrice());
        }
    }
}