反射从配置文件中读取

className=teacher.TT con_A_count=3 con_Args1=int con_Args2=String con_Args3=int con_obj1=12 con_obj2=zheng con_obj3=22 me_Aa_name=test me_Ab_count=3 me_Args1=int me_Args2=String me_Args3=int me_obj1=22 me_obj2=郑云飞 me_obj3=22

 

package hashMap;
import java.io.FileInputStream;
import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
/**
 * @author 郑云飞
 * 内容:反射从配置文件中读取信息
 * date:2010年9月27日PM
 */
class ReflectTest 
{
  @SuppressWarnings("unchecked")
  public static void main(String[] args) throws Exception
  {
    Properties pp=new Properties();
    List<String> ls=new ArrayList<String>();
      pp.load(new FileInputStream("propers.ini"));//加载配置文件内容
    Iterator<String> it1=(Iterator<String>) pp.propertyNames();
    while(it1.hasNext())
    {
      ls.add(it1.next());//将配置文件里的键存放的容器中
    }
    Collections.sort(ls);//对容器进行自然排序
    String[] s = new String[ls.size()];
    for(int i=0;i<ls.size();i++)
    {
       byte []data=pp.getProperty(ls.get(i)).getBytes("iso8859-1");//设置字符编码
       ls.set(i, new String(data,"gb2312"));//为容器ls赋值
       s[i]=ls.get(i);//将容器ls复制到字符串数组s中
    }
    Class<?> cl = Class.forName(s[0]);//获得要调用的类名
    Object o = getObject(cl, s);//获得对象
    invoke(cl, o, s);//通过对象调用方法
    }
  //用反射产生对象并返回该对象
  public static Object getObject(Class<?> cl,String[] args) throws Exception
  {
    int con_Count = Integer.parseInt(args[1]);
    Object o = null;
    if(con_Count==0)
    {
      o = cl.newInstance();
    }
    else
    {
      Class<?>[] con_Args = new Class[con_Count];
      Object[] obj_Args = new Object[con_Count];
      Object[] oo = null;
      for(int i=0;i<con_Count;i++)
      {
        oo = turn(args[2+i],args[2+i+con_Count]);

        con_Args[i] = (Class<?>)oo[0];
        obj_Args[i] = oo[1];

      }
      Constructor<?> con = cl.getDeclaredConstructor(con_Args);
      o = con.newInstance(obj_Args);
    }
    return o;
  }

  //用反射执行某一方法并返回结果
  public static Object invoke(Class<?> cl,Object o,String[] args) throws Exception
  {
    int con_Count = Integer.parseInt(args[1]);
    String methodName = args[2+2*con_Count];    
    int me_Count = Integer.parseInt(args[3+2*con_Count]);
    Class<?>[] me_Args = new Class[me_Count];
    Object[] me_Obj_Args = new Object[me_Count];
    Object[] oo = null;
    for(int i=0;i<me_Count;i++)
    {
      oo = turn(args[4+2*con_Count+i],args[4+2*con_Count+i+me_Count]);

      me_Args[i] = (Class<?>)oo[0];
      me_Obj_Args[i] = oo[1];      
    }

    Method m = cl.getDeclaredMethod(methodName,me_Args);
    Object res = m.invoke(o,me_Obj_Args);
    //System.out.println("方案执行结果:"+res);
    return res;
  }

  public static Object[] turn(String cType,String oArg)
  {
    Object[] o = new Object[2];

    if(cType.equals("int"))
    {
      o[0] = int.class;
      o[1] = Integer.parseInt(oArg);
    }
    if(cType.equals("String"))
    {
      o[0] = String.class;
      o[1] = oArg;
    }
    if(cType.equals("float"))
    {
      o[0] = float.class;
      o[1] = Float.parseFloat(oArg);
    }
    if(cType.equals("char"))
    {
      o[0] = char.class;
      o[1] = oArg.charAt(0);
    }
    if(cType.equals("boolean"))
    {
      o[0] = boolean.class;
      o[1] = Boolean.parseBoolean(oArg);
    }
    return o;
  }
}
class TT
{
  int age;
  String name;
  int id;
  
  public TT(int age,String name,int id)
  {
    this.age=age;
    this.name=name;
    this.id=id;
  }
  public static void test(int age,String name,int id)
  {
    System.out.println("从配置文件中读取到的方法的信息为:\n"+"年龄="+age+"\t姓名="+name+"  编号="+id);
  }
  @Override
  public String toString()
  {
    // TODO Auto-generated method stub
    return "年龄:"+age+"姓名:"+name+"编号:"+id;
  }
  
}