// 給定Map物件及要產生的Bean類別名稱

// 可以取回已經設定完成的物件

public static Object getCommand(Map requestMap,

String commandClass)

throws Exception {

Class c = Class.forName(commandClass);

Object o = c.newInstance();

return updateCommand(requestMap, o);

}

// 使用reflection自動找出要更新的屬性

public static Object updateCommand(

Map requestMap,

Object command)

throws Exception {

Method[] methods =

command.getClass().getDeclaredMethods();

for(int i = 0; i < methods.length; i++) {

// 略過private、protected成員

// 且找出必須是set開頭的方法名稱

if(!Modifier.isPrivate(methods[i].getModifiers()) &&

!Modifier.isProtected(methods[i].getModifiers()) &&

methods[i].getName().startsWith("set")) {

// 取得不包括set的名稱

String name = methods[i].getName()

.substring(3)

.toLowerCase();

// 如果setter名稱與鍵值相同

// 呼叫對應的setter並設定值

if(requestMap.containsKey(name)) {

String param = (String) requestMap.get(name);

Object[] values = findOutParamValues(

param, methods[i]);

methods[i].invoke(command, values);

}

}

}

return command;

}

// 轉換為對應型態的值

private static Object[] findOutParamValues(

String param, Method method) {

Class[] params = method.getParameterTypes();

Object[] objs = new Object[params.length];

for(int i = 0; i < params.length; i++) {

if(params[i] == String.class) {

objs[i] = param;

}

else if(params[i] == Short.TYPE) {

short number = Short.parseShort(param);

objs[i] = new Short(number);

}

else if(params[i] == Integer.TYPE) {

int number = Integer.parseInt(param);

objs[i] = new Integer(number);

}

else if(params[i] == Long.TYPE) {

long number = Long.parseLong(param);

objs[i] = new Long(number);

}

else if(params[i] == Float.TYPE) {

float number = Float.parseFloat(param);

objs[i] = new Float(number);

}

else if(params[i] == Double.TYPE) {

double number = Double.parseDouble(param);

objs[i] = new Double(number);

}

else if(params[i] == Boolean.TYPE) {

boolean bool = Boolean.parseBoolean(param);

objs[i] = new Boolean(bool);

}

}

return objs;

}

}