reflector.java

一个可以存储和打印成绩单的系统

package org.minjey.cjsjk.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Reflector {
	
	public void setValue(Object obj, String fieldname, Object[] vobjs) {
		Class[] vclas = null;
		if(vobjs != null) {
			vclas = new Class[vobjs.length];
			for(int i = 0; i < vobjs.length; i++) {
				vclas[i] = vobjs[i].getClass();
			}
		}
		setValue(obj, fieldname, vobjs, vclas);
	}
	
	public void setValue(Object obj, String fieldname, Object[] vobjs, Class[] vclas) {
		
		doInvoke(obj, fieldname, vobjs, vclas, "set");
	}
	
	public Object makeObject(String name, Object[] values) {
		Object obj = null;
		try {
			Class cla = Class.forName(name);
			obj = makeObject(cla, values);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return obj;
	}
	
	public Object makeObject(Class type, Object[] values) {
		Object obj = null;
		Class[] clas= null;
		if(values != null) {
			clas = new Class[values.length];
			for(int i = 0; i < values.length; i++) {
				clas[i] = values[i].getClass();
			}
		}
		try {
			obj = type.getConstructor(clas).newInstance(values);
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		}
		return obj;
	}

	/*
	public Map<String, Object> getValues(Object obj) {
		Map<String, Object> map = new HashMap<String, Object>();
		Class cla = obj.getClass();
		Field[] fields = cla.getDeclaredFields();

		for(int i = 0; i < fields.length; i ++) {
			String fieldname = fields[i].getName();
			Object value = getValue(obj, fieldname);
			map.put(fieldname, value);
		}
		
		return map;
	}
	*/

	public Object getValue(Object obj, String fieldname) {
		return getValue(obj, fieldname, null);
	}
	
	public Object getValue(Object obj, String fieldname, Object[] vobjs) {
		Class[] vclas = getTypes(vobjs);
		return doInvoke(obj, fieldname, vobjs, vclas, "get");
	}
	
	public Object doStaticGetValue(Class cla, String fieldname) {
		return doStaticInvoke(cla, "get" + fieldname, null);
	}
	
	public String getClassName(Class cla) {
		String name = cla.getSimpleName();
		name = name.toLowerCase();
		return name;
	}
	
	private Object doStaticInvoke(Class cla, String methodname, Object[] vobjs) {
		Object obj = null;
		
		Class[] vclas = getTypes(vobjs);
		
		try {
			Method meth = cla.getDeclaredMethod(methodname, vclas);
			obj = meth.invoke(null, null);
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
		return obj;
	}
	
	private Object doInvoke(Object obj, String fieldname, Object[] vobjs, Class[] vclas, String type) {
		Object value = null;
		String methodname = type + Character.toUpperCase(fieldname.charAt(0)) + fieldname.substring(1);
		try {
			
			Method meth = obj.getClass().getMethod(methodname, vclas);
			value = meth.invoke(obj, vobjs);
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
		return value;
	}

	private Class[] getTypes(Object[] objs) {
		Class[] vclas = null;
		if(objs != null) {
			vclas = new Class[objs.length];
			for(int i = 0; i < objs.length; i++) {
				vclas[i] = objs[i].getClass();
			}
		}
		return vclas;
	}
}