javabean和map之间的相互转换

雨点打透心脏的1/2处 2022-02-03 00:45 259阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDA1NjY2_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDA1NjY2_size_16_color_FFFFFF_t_70 1]

# javabean People代码 #

package TestIntrosPector;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    import lombok.ToString;
    
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class People { 
    	private int age;
    	private String name;
    	private char sex='女';
    }

# Beanutil转换工具类 #

package map2javabean;
    
    import java.beans.BeanInfo;
    import java.beans.IntrospectionException;
    import java.beans.Introspector;
    import java.beans.PropertyDescriptor;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    import java.util.HashMap;
    import java.util.Map;
    
    public class BeanUtil { 
    	//一：map2javabean 把map对象转换为javabean
    	public  static <T> T map2bean(Map<String, Object> map,Class<T> beantype) throws Exception{ 
    		 T object=beantype.newInstance();//创建对象
    		 //获取类的属性描述器
    		 BeanInfo beaninfo=Introspector.getBeanInfo(beantype,Object.class);
    		 //获取类的属性集
    		 PropertyDescriptor[] pro=beaninfo.getPropertyDescriptors();
    		 for (PropertyDescriptor property : pro) { 
    			//获取属性的名字
    			 String name=property.getName();
    			 Object value=map.get(name);//得到属性name在map中对应的value。
    			 Method set=property.getWriteMethod();//得到属性的set方法
    			 //接下来将map的value转换为属性的value
    			 set.invoke(object, value);//执行set方法
    		}
    		 return object;
    	}
    	//二：将javabean转换为map
    	public static Map<String,Object> javabean2map(Object bean) throws Exception{ //传入一个javabean对象
    		Map<String, Object> map=new HashMap<>();
    		 //获取类的属性描述器
    		 BeanInfo beaninfo=Introspector.getBeanInfo(bean.getClass(),Object.class);
    		 //获取类的属性集
    		 PropertyDescriptor[] pro=beaninfo.getPropertyDescriptors();
    		 for (PropertyDescriptor property : pro) { 
    			String key=property.getName();//得到属性的name
    			Method get=property.getReadMethod();
    			Object value=get.invoke(bean);//执行get方法得到属性的值
    			map.put(key, value);
    		}
    		return map;
    	}
    }

# 测试Beanutil #

package map2javabean;
    
    import java.util.Map;
    
    import TestIntrosPector.People;
    
    public class TestBeanUtil { 
    	public static void main(String[] args) throws Exception { 
    		//测试javabena2map
    		People peo=new People(18, "王麻子", '男');
    		Map<String, Object> map=BeanUtil.javabean2map(peo);
    		System.out.println("javabena2map>>>:"+map);
    		//测试map2javabena
    	    People people=BeanUtil.map2bean(map, People.class);
    		System.out.println("map2javabena>>>:"+people);
    	}
    }

![在这里插入图片描述][20190508145212345.png]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNDA1NjY2_size_16_color_FFFFFF_t_70 1]: /images/20220203/840e768b283248a891c043f9cab449ff.png
[20190508145212345.png]: /images/20220203/94b22e148866442db7a31140a7e6b1f6.png