Basic operation -- Reflection fill data

From , 2 Years ago, written in Java, viewed 211 times.

1.主类
package s0401反射实例自动填充;
 
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
 
public class Main {
 
        public static void main(String[] args) throws Exception
        {
                
                //资料库
                Map<String,String> data=new HashMap<String,String>();
                data.put("name","fengwei");
                data.put("age","19");
                data.put("tel","909");
                
 
            
            //获得className 字符串的实例对象
           Class s=Class.forName("s0401反射实例自动填充.Users"); //调用forName("X") 将导致名为 X 的类被初始化。properties中存放的是类的名称
            
            //对象实例化
            Object obj=s.newInstance();
            
            //自动填充数据
            autoFile(obj,data);
            
            //输出获得的实例对象
            System.out.println(obj);
        
        }
 
        private static void autoFile(Object obj, Map<String, String> data) throws IllegalArgumentException, IllegalAccessException 
        {
                //获得填充数据中的所有字段,然后将此字段在数据源data中查询,如果有则填充
                
                //获得字节码对象
                Class a=obj.getClass();
                
                //获得所有的私有字段
                Field[] fields=a.getDeclaredFields();
 
            
                for(Field f:fields)
                {     
                        //在资料库中获得需要的数据
                        String value=data.get(f.getName());//在资料库中查找有没有对应要填充的字段
 
                        //强制设置权限,不然无法改变值
                        f.setAccessible(true);
                        
                        //如果有需要的字段就填充到obj中
                        if(value!=null)
                        {  
                                f.set(obj, value);//填充值
                        }
                }
        }
}
 
2.User类
package s0401反射实例自动填充;
 
public class User {
   private String name;
   private String age;
   private String tel;
   
   
public String getTel() {
        return tel;
}
public void setTel(String tel) {
        this.tel = tel;
}
public String getName() {
        return name;
}
public void setName(String name) {
        this.name = name;
}
public String getAge() {
        return age;
}
public void setAge(String age) {
        this.age = age;
}
@Override
public String toString() {
        return "User [name=" + name + ", age=" + age + ", tel=" + tel + "]";
}
 
 
}
 

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1.主类
package s0401反射实例自动填充;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class Main {

public static void main(String[] args) throws Exception
	{
		
		//资料库
		Map<String,String> data=new HashMap<String,String>();
		data.put("name","fengwei");
		data.put("age","19");
		data.put("tel","909");

//获得className 字符串的实例对象
	   Class s=Class.forName("s0401反射实例自动填充.Users"); //调用forName("X") 将导致名为 X 的类被初始化。properties中存放的是类的名称
	    
	    //对象实例化
	    Object obj=s.newInstance();
	    
	    //自动填充数据
	    autoFile(obj,data);
	    
	    //输出获得的实例对象
	    System.out.println(obj);
	
	}

private static void autoFile(Object obj, Map<String, String> data) throws IllegalArgumentException, IllegalAccessException 
	{
		//获得填充数据中的所有字段,然后将此字段在数据源data中查询,如果有则填充
		
		//获得字节码对象
		Class a=obj.getClass();
		
		//获得所有的私有字段
		Field[] fields=a.getDeclaredFields();

for(Field f:fields)
		{     
			//在资料库中获得需要的数据
			String value=data.get(f.getName());//在资料库中查找有没有对应要填充的字段

//强制设置权限,不然无法改变值
			f.setAccessible(true);
			
			//如果有需要的字段就填充到obj中
			if(value!=null)
			{  
				f.set(obj, value);//填充值
			}
		}
	}
}

2.User类
package s0401反射实例自动填充;

public class User {
   private String name;
   private String age;
   private String tel;
   
   
public String getTel() {
	return tel;
}
public void setTel(String tel) {
	this.tel = tel;
}
public String getName() {
	return name;
}
public void setName(String name) {
	this.name = name;
}
public String getAge() {
	return age;
}
public void setAge(String age) {
	this.age = age;
}
@Override
public String toString() {
	return "User [name=" + name + ", age=" + age + ", tel=" + tel + "]";
}

}

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Basic operation -- Reflection fill data

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