使用BeanUtils.copyProperties进行对象之间的属性赋值

偏执的太偏执、 2022-01-31 05:25 175阅读 0赞

1、使用org.springframework.beans.BeanUtils.copyProperties方法进行对象之间属性的赋值，避免通过get、set方法一个一个属性的赋值

/**
         * 对象属性拷贝 <br>
         * 将源对象的属性拷贝到目标对象
         *
         * @param source 源对象
         * @param target 目标对象
         */
        public static void copyProperties(Object source, Object target) {
            try {
                BeanUtils.copyProperties(source, target);
            } catch (BeansException e) {
                LOGGER.error("BeanUtil property copy  failed :BeansException", e);
            } catch (Exception e) {
                LOGGER.error("BeanUtil property copy failed:Exception", e);
            }
        }

2、List集合之间的对象属性赋值

/**
         * @param input 输入集合
         * @param clzz  输出集合类型
         * @param <E>   输入集合类型
         * @param <T>   输出集合类型
         * @return 返回集合
         */
        public static <E, T> List<T> convertList2List(List<E> input, Class<T> clzz) {
            List<T> output = Lists.newArrayList();
            if (CollectionUtils.isNotEmpty(input)) {
                for (E source : input) {
                    T target = BeanUtils.instantiate(clzz);
                    BeanUtil.copyProperties(source, target);
                    output.add(target);
                }
            }
            return output;
        }

比如有两个类，User和Employee，将存储Employee对象的List赋给存储User对象的List。

User类：

public class User {
        private String name;
        private Integer age;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Integer getAge() {
            return age;
        }
    
        public void setAge(Integer age) {
            this.age = age;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }

Employee类：

public class Employee {
        private String name;
    
        private Integer age;
        private String dept;
    
        public Employee(String name, Integer age, String dept) {
            this.name = name;
            this.age = age;
            this.dept = dept;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Integer getAge() {
            return age;
        }
    
        public void setAge(Integer age) {
            this.age = age;
        }
    
        public String getDept() {
            return dept;
        }
    
        public void setDept(String dept) {
            this.dept = dept;
        }
    
        @Override
        public String toString() {
            return "Employee{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", dept='" + dept + '\'' +
                    '}';
        }
    }

测试类：

@RunWith(PowerMockRunner.class)
    public class TestUtil
    {
        @Test
        public void test(){
            Employee ee1=new Employee("A",21,"it");
            Employee ee2=new Employee("B",23,"account");
            User user=new User();
            BeanUtil.copyProperties(ee1, user);
            System.out.println(user);
            System.out.println("-------------分割线--------------");
            List<User> output=new ArrayList<>();
            List<Employee> source= Arrays.asList(ee1,ee2);
            output=BeanUtil.convertList2List(source,User.class);
            for (User str:output) {
                System.out.println(str);
            }
        }
    }

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