反射实现读取文本信息进行对象的动态创建

 1 public class TestReflectApp {
 2 
 3     public static void main(String[] args) throws Exception {
 4         //
 5         InputStream is = new FileInputStream("D:\eclipse-workspace-bigdata4\Java25\src\objects.properties");
 6 //        byte[] bytes = new byte[is.available()];
 7 //        is.read(bytes);
 8 //        //is.close();
 9         //System.out.println(new String(bytes));//注意读取的话出现读到文件末尾,后面进行加载的话内容为空
10         Properties prop = new Properties();
11         prop.load(is);
12         
13         //
14         String objClass = prop.getProperty("object.class");
15         Class clazz = Class.forName(objClass);
16         Object obj = clazz.newInstance();
17         
18         //name
        //取值 19 String propName = prop.getProperty("object.prop1.name"); 20 String propValue = prop.getProperty("object.prop1.value");
       //得到name字段
21 Field f = clazz.getDeclaredField(propName); 22 if(f.getType() == String.class){ 23 f.setAccessible(true); 24 f.set(obj, propValue); 25 } 26 27 28 //age 29 propName = prop.getProperty("object.prop2.name"); 30 propValue = prop.getProperty("object.prop2.value"); 31 f = clazz.getDeclaredField(propName); 32 if(f.getType() == int.class){ 33 f.setAccessible(true); 34 Integer i = Integer.parseInt(propValue) ; 35 f.set(obj, i); 36 } 37 38 } 39 40 }

2、文本文件(放在根目录下)

  文件名:objects.properties

  object.class=com.it18zhang.java25.Person
  object.prop1.name=name
  object.prop1.value=tomas
  object.prop2.name=age
  object.prop2.value=20

原文地址:https://www.cnblogs.com/yihaifutai/p/6785702.html