合并两个bean的字段

悠悠 2024-03-23 11:25 120阅读 0赞

#### 合并两个bean的字段 ####

*  前言
 *  一、准备工作
 *   *  1、准备一个全是Object的对象...OdooResp
     *  2、准备一个固定属性的对象...User
 *  二、接口API
 *  三、测试结果
 *  总结

--------------------

## 前言 ##

说实话，这已经是工作上第二次遇到这个问题了…  
虽然说这种需求很奇怪，但还是记录下。

需求概述：  
1：对象a，`合并两个bean的字段`（id，name，fav）  
2：对象b，`没有明确的属性`（属性个数不确定，属性类型不确定）  
3：接口返回结果里，所有的字段都有

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`提示：以下是本篇文章正文内容，下面案例可供参考`

## 一、准备工作 ##

hutool，google.guava

### 1、准备一个全是Object的对象…OdooResp ###

@Data
    public class OdooResp {
        
        private Object employee_id;
        private Object salary;
        private Object booleanFlag;
        private Object null_test;
        private Object job_id;
        private Object history;
    
        public OdooResp() {
        
        }
    
        public OdooResp(Object employee_id, Object salary, Object booleanFlag, Object null_test, Object job_id, Object history) {
        
            this.employee_id = employee_id;
            this.salary = salary;
            this.booleanFlag = booleanFlag;
            this.null_test = null_test;
            this.job_id = job_id;
            this.history = history;
        }
    }

### 2、准备一个固定属性的对象…User ###

@Data
    public class User {
        
    
        private Long id;
    
        private String name;
    
        private List<String> fav;
    
        public User() {
        
        }
    
        public User(Long id, String name, List<String> fav) {
        
            this.id = id;
            this.name = name;
            this.fav = fav;
        }
    }

## 二、接口API ##

代码如下（示例）：

@RestController
    @RequestMapping("bean2map")
    public class Bean2MapApi {
        
    
        @GetMapping(value = "demo", name = "将两个bean组合成一个map返回给前端")
        public Object demo() {
        
            List<Object> response = new ArrayList<>();
    
            List<OdooResp> odooRespList = getOdooRespList();
            List<Map<String, Object>> odooMapList = odooRespList.stream().map(BeanUtil::beanToMap).collect(Collectors.toList());
    
            List<User> userList = getUserList();
            
        	//前面都是造数据，getObject是重点
        	return userList.stream().map(user -> getObject(odooMapList, user)).collect(Collectors.toList());
        }
    
        private Object getObject(List<Map<String, Object>> odooMapList, User user) {
        
            Map<String, Object> odooMap = odooMapList.stream().filter(tempMap -> user.getId().equals(tempMap.get("employee_id"))).findFirst().orElse(null);
            if (CollectionUtils.isEmpty(odooMap)) {
        
                return user;
            }
            Map<String, Object> result = new HashMap<>();
            result.putAll(BeanUtil.beanToMap(user));
            result.putAll(odooMap);
            return result;
        }
    
        public static List<OdooResp> getOdooRespList() {
        
            List<OdooResp> odooRespList = new ArrayList<>();
            List<List<Object>> hository1 = Lists.newArrayList(Lists.newArrayList(2018, "kk", "不行"), Lists.newArrayList(2020, "cl", "一般"), Lists.newArrayList(2022, "yl", "从可以到不行"));
            List<List<Object>> hository2 = Lists.newArrayList(Lists.newArrayList(2016, "jd", "不行"), Lists.newArrayList(2017, "gc", "一般"), Lists.newArrayList(2022, "home", "从可以到不行"));
    
            odooRespList.add(new OdooResp(111L, new BigDecimal("108.50"), false, null, Lists.newArrayList(2222, "实习生"), hository1));
            odooRespList.add(new OdooResp(222L, new BigDecimal("4500.50"), true, Lists.newArrayList("最开始", "早恋了"), Lists.newArrayList("最后", "结婚了"), hository2));
    
            return odooRespList;
        }
    
    
        public static List<User> getUserList() {
        
            List<User> userList = new ArrayList<>();
            userList.add(new User(111L, "张三", Lists.newArrayList("吃饭", "睡觉", "打豆豆")));
            userList.add(new User(222L, "李四", Lists.newArrayList("动漫", "小说")));
            return userList;
        }
    }

## 三、测试结果 ##

[
        {
        
            "null_test": null,
            "job_id": [
                2222,
                "实习生"
            ],
            "employee_id": "111",
            "name": "张三",
            "fav": [
                "吃饭",
                "睡觉",
                "打豆豆"
            ],
            "id": "111",
            "history": [
                [
                    2018,
                    "kk",
                    "不行"
                ],
                [
                    2020,
                    "cl",
                    "一般"
                ],
                [
                    2022,
                    "yl",
                    "从可以到不行"
                ]
            ],
            "salary": 108.50,
            "booleanFlag": false
        },
        {
        
            "null_test": [
                "最开始",
                "早恋了"
            ],
            "job_id": [
                "最后",
                "结婚了"
            ],
            "employee_id": "222",
            "name": "李四",
            "fav": [
                "动漫",
                "小说"
            ],
            "id": "222",
            "history": [
                [
                    2016,
                    "jd",
                    "不行"
                ],
                [
                    2017,
                    "gc",
                    "一般"
                ],
                [
                    2022,
                    "home",
                    "从可以到不行"
                ]
            ],
            "salary": 4500.50,
            "booleanFlag": true
        }
    ]

--------------------

## 总结 ##

没有总结…