通过java反射获取任意对象的字段名及字段值

骑猪看日落 2022-08-27 04:49 202阅读 0赞

import java.lang.reflect.Field;
    
    public class ReflectClass3 {
    
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		Person p = new Person(1, "ctl", true, 'c', 2.0f, 2.0, 1L, (short) 1,
    				(byte) 1);
    
    		p.setId(0);
    		p.setName("张三");
    		p.setIsMen(true);
    		p.setCh('c');
    		p.setFloat_(2.0f);
    		p.setDouble_(3.0);
    		p.setLong_(2l);
    		p.setShort_((short) 1);
    		p.setByte_((byte) 2);
    		reflect(p);
    	}
    
    	public static void reflect(Object obj) {
    		if (obj == null)
    			return;
    		Field[] fields = obj.getClass().getDeclaredFields();
    		String[] types1={"int","java.lang.String","boolean","char","float","double","long","short","byte"};
    		String[] types2={"Integer","java.lang.String","java.lang.Boolean","java.lang.Character","java.lang.Float","java.lang.Double","java.lang.Long","java.lang.Short","java.lang.Byte"};
    		for (int j = 0; j < fields.length; j++) {
    			fields[j].setAccessible(true);
    			// 字段名
    		  System.out.print(fields[j].getName() + ":");
    			// 字段值
    			for(int i=0;i<types1.length;i++){
    				if(fields[j].getType().getName()
    						.equalsIgnoreCase(types1[i])|| fields[j].getType().getName().equalsIgnoreCase(types2[i])){
    					try {
    						System.out.print(fields[j].get(obj)+"     ");
    					} catch (Exception e) {
    						e.printStackTrace();
    					} 
    				}
    			}
    		}
    	}
    }
    
    public class Person {
    public int id;
    public String name;
    public boolean isMen;
    public Character ch;
    public Float float_;
    public Double double_;
    public Long long_;
    public Short short_;
    public Byte byte_;
    public int getId() {
    	return id;
    }
    public void setId(int id) {
    	this.id = id;
    }
    public String getName() {
    	return name;
    }
    public void setName(String name) {
    	this.name = name;
    }
    public boolean getIsMen() {
    	return isMen;
    }
    public void setIsMen(boolean isMen) {
    	this.isMen = isMen;
    }
    public Character getCh() {
    	return ch;
    }
    public void setCh(Character ch) {
    	this.ch = ch;
    }
    public Float getFloat_() {
    	return float_;
    }
    public void setFloat_(Float float_) {
    	this.float_ = float_;
    }
    public Double getDouble_() {
    	return double_;
    }
    public void setDouble_(Double double_) {
    	this.double_ = double_;
    }
    public Long getLong_() {
    	return long_;
    }
    public void setLong_(Long long_) {
    	this.long_ = long_;
    }
    public Short getShort_() {
    	return short_;
    }
    public void setShort_(Short short_) {
    	this.short_ = short_;
    }
    public Byte getByte_() {
    	return byte_;
    }
    public void setByte_(Byte byte_) {
    	this.byte_ = byte_;
    }
    public Person(int id, String name, Boolean isMen, Character ch, Float float_,
    		Double double_, Long long_, Short short_, Byte byte_) {
    	super();
    	this.id = id;
    	this.name = name;
    	this.isMen = isMen;
    	this.ch = ch;
    	this.float_ = float_;
    	this.double_ = double_;
    	this.long_ = long_;
    	this.short_ = short_;
    	this.byte_ = byte_;
    	}
    
    public Person() {
    	super();
    }
    }