關於反射的基本應用--將一個對象中的所有屬性值賦值給另一個對象

 

在開發中,存在DO,BO,VO之類的模型,在從DO到BO或從BO到VO的過程中,我們通常要進行取值賦值的一系列操作,非常繁雜,該方法主要將這件事情進行抽取,將繁雜事情簡單化

1.定義BO

/**
 * Created by Yanwu on 2018/3/1.
 */
public class TestBo {
    private Long id;
    private String name;
    private int age;
    private Boolean sex;
    private Double height;

    public Double getHeight() {
        return height;
    }

    public void setHeight(Double height) {
        this.height = height;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }
}

2.定義VO

/**
 * Created by Yanwu on 2018/3/1.
 */
public class TestVo {
    private Long id;
    private String name;
    private int age;
    private Boolean sex;
    private Double weight;

    public Double getWeight() {
        return weight;
    }

    public void setWeight(Double weight) {
        this.weight = weight;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }

    @Override
    public String toString() {
        return "TestVo{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex=" + sex +
                ", weight=" + weight +
                '}';
    }
}

3.轉換的工具函數

public <T> T gotObjectByObject(Object object, Class<T> clazz) throws Exception {
    T t = null;
    if (clazz != null && object != null) {
        t = clazz.newInstance();
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            field.setAccessible(true);
            String key = field.getName();
            try {
                Field field1 = object.getClass().getDeclaredField(key);
                field1.setAccessible(true);
                Object val = field1.get(object);
                field.set(t, val);
            } catch (Exception e) {
                System.out.println(object.getClass().getName() + "沒有該屬性: " + key);
            }
        }
    }
    return t;
}

4.測試

@Test
public void testObject() throws Exception {
    TestBo bo = new TestBo();
    bo.setId(1L);
    bo.setName("測試");
    bo.setAge(28);
    bo.setSex(true);
    bo.setHeight(12.32);
    TestVo vo = gotObjectByObject(bo, TestVo.class);
    System.out.println(vo.toString());
}

5.輸出結果