common toString using reflection

最新推荐文章于 2025-08-18 22:47:43 发布

teacher3010

最新推荐文章于 2025-08-18 22:47:43 发布

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分类专栏： java 文章标签： java

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本文介绍了一种Java对象转字符串的通用方法，通过反射获取对象的所有字段，并将其转换为字符串格式。此方法适用于复杂对象的序列化，简化了数据的输出过程。

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core class:

package com.itreply.oschina;

import java.lang.reflect.Field;


public class GeneralToString {
	public static String toString(Object obj) {
		
		if(obj == null) return "null";
		
		StringBuffer sb = new StringBuffer();
		
		Class clazz = obj.getClass();
		Field[] fields = clazz.getDeclaredFields();
		
		sb.append(clazz.getName() + "{");
		try{
			for(Field field :fields){
				field.setAccessible(true);
				sb.append("\n\t" + field.getName() + " = " + field.get(obj));
			}
		} catch(IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		sb.append("\n}");
		
		return sb.toString();
	}
}

test :

package com.itreply.oschina;

public class ClassTest {
	public String publicStringField;
	public static int publicStaticStrField;
	
	private double privateIntField;
	private static float privateStaticFloatField;
	
	protected short protectedShortField;
	protected static long protectedStaticLongField;
	
	public ClassTest(String a, int b, double c, float d, short e, long f) {
		this.publicStringField = a;
		this.publicStaticStrField = b;
		this.privateIntField = c;
		this.privateStaticFloatField =d;
		this.protectedShortField = e;
		this.protectedStaticLongField = f;
	}
	
	public static void main(String[] args) {
		ClassTest c = new ClassTest("hello",10,10.88d,10.9f,(short)11,222222222222222L);
		System.out.println(GeneralToString.toString(c));
		
	}
}