遍历对象属性Demo

copy /y/e/s E:\workspace3\learn\api\out\production\classes E:\tt

测试代码

package com.sam.learn;

import com.sam.learn.api.dto.BookDTO;
import com.sam.learn.api.dto.UserDTO;

import java.lang.reflect.Field;
import java.util.*;
public class AppStart {
    public static void main(String[] args) throws Exception {
        UserDTO user = new UserDTO();
        user.setName("Scott");
        user.setAge(20);
        user.setPhone("13600000000");

        List list = new ArrayList();
        list.add(new BookDTO("Java", 1));
        list.add(new BookDTO("C++", 2));
        user.setBooks(list);

        Map map = new HashMap<>();
        map.put(new Date(), new BookDTO("Java30", 30));
        map.put(new Date(), new BookDTO("C++40", 40));
        user.setMap(map);

        BookDTO[] bookDTOArray = new BookDTO[]{new BookDTO("Java300", 300), new BookDTO("C++400", 400)};
        user.setBookDTOArray(bookDTOArray);

        reflect(user, null, "-1");


    }

    public static void reflect(Object e, String parentName, String index) throws Exception {
        Class cls = e.getClass();
        Field[] fields = cls.getDeclaredFields();
        for(Field f : fields){
            f.setAccessible(true);
            if(Collection.class.isAssignableFrom(f.getType())){
                Iterator iterator = ((Collection)f.get(e)).iterator();
                int j = 0;
                while(iterator.hasNext()){
                    reflect(iterator.next(), f.getName(), "[" + String.valueOf(j) + "]");
                    j++;
                }
                continue;
            } else if(Map.class.isAssignableFrom(f.getType())){
                Map map = (Map)f.get(e);
                Iterator iterator = map.entrySet().iterator();
                int j = 0;
                while(iterator.hasNext()){
                    Map.Entry entry = (Map.Entry) iterator.next();
                    reflect(entry.getValue(), f.getName(), "[" + String.valueOf(j) + "](key:" + entry.getKey() + ")");
                    j++;
                }
                continue;
            } else if(f.getType().isArray()){
                Object[] objectArray = (Object[])f.get(e);
                int j = 0;
                for(Object obj : objectArray){
                    reflect(obj, f.getName(), "[" + String.valueOf(j) + "]");
                    j++;
                }
                continue;
            }

            if(parentName != null && !index.equals("-1")){
                System.out.println(parentName + "." + f.getName() + index + " = " + f.get(e));
            } else {
                System.out.println(f.getName() + " = " + f.get(e));
            }

        }
    }
}

package com.sam.learn.api.dto;

public class BookDTO {

    private String name;
    private Integer id;

    public BookDTO(String name, Integer id){
        this.name = name;
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public Integer getId() {
        return id;
    }

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

package com.sam.learn.api.dto;

import java.util.List;
import java.util.Map;

public class UserDTO {
    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 getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public List<BookDTO> getBooks() {
        return books;
    }

    public void setBooks(List<BookDTO> books) {
        this.books = books;
    }

    public Map getMap() {
        return map;
    }

    public void setMap(Map map) {
        this.map = map;
    }

    public BookDTO[] getBookDTOArray() {
        return bookDTOArray;
    }

    public void setBookDTOArray(BookDTO[] bookDTOArray) {
        this.bookDTOArray = bookDTOArray;
    }

    private String name;
    private Integer age;
    private String phone;
    private List<BookDTO> books;
    private Map map;
    private BookDTO[] bookDTOArray;
}