Java根据Bean实体某一属性获取Bean全部信息

古城微笑少年丶 2024-03-30 15:33 95阅读 0赞

## Java根据Bean实体某一属性获取Bean全部信息 ##

#### 业务场景 ####

业务涉及到多个国家，现在需要根据国家的某一属性（以`国家简称`为例）获得国家的全部信息。

#### 业务代码 ####

package com.example.country;
    
    import lombok.*;
    
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    
    @ToString
    public class CountryEnvironment {
        
    
        @Getter
        private final Integer countryNumber;//国家编码
    
        @Getter
        private final String countryName;//国家名称
    
        @Getter
        private final String countryLocation;//国家位置
    
        @Getter
        private final String countryAbbreviation;//国家简称
    
        private CountryEnvironment(Integer countryNumber, String countryName, String countryLocation, String countryAbbreviation) {
        
            this.countryNumber = countryNumber;
            this.countryName = countryName;
            this.countryLocation = countryLocation;
            this.countryAbbreviation = countryAbbreviation;
        }
    
        private static final Map<String,CountryEnvironment> map = new ConcurrentHashMap<>();
    
        public static CountryEnvironment getCountryInformation(String countryAbbreviation) {
        
    
            if (map.get(countryAbbreviation) == null) {
        
                CountryEnvironment countryEnvironment;
                switch (countryAbbreviation) {
        
                    case "UK":
                        countryEnvironment = new CountryEnvironment(22, "Britain", "Southern", "UK");
                        break;
                    case "FR":
                        countryEnvironment = new CountryEnvironment(33, "France", "Northern", "FR");
                        break;
                    default:
                        throw new RuntimeException();
                }
                 map.put(countryAbbreviation, countryEnvironment);
            }
            return map.get(countryAbbreviation);
        }
    
        public static void main(String[] args) {
        
            //主函数测试
            CountryEnvironment countryEnvironment = getCountryInformation("UK");
            System.out.println(countryEnvironment);
        }
    }

**测试结果：**

![在这里插入图片描述][828c3402fe7540ebac9b2a88360fc59b.png]

[828c3402fe7540ebac9b2a88360fc59b.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/654ee4173c134b3eb29259aa4fadeb8b.png