利用Java反射 递归创建对象
最近同事问到一个涉及到Java反射的问题，整理下来如下：
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需求：给定父对象，和map关系如下：
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? MyObject1 myObject1 = new MyObject1();
??Map<String, Object> resultMap = new HashMap<String,Object>();
??resultMap.put("myObject1.myobject2.mysub1.name", "sub1Name");
??resultMap.put("myObject1.myobject2.mysub1.password", "111111");
??resultMap.put("myObject1.myobject2.mysub1.mobile", "13900000000");
??resultMap.put("myObject1.myobject2.mysub2.name", "sub2Name");
??resultMap.put("myObject1.myobject2.name", "object2");
??
??myObject1 = (MyObject1)ChaletUtils.getParentObject(resultMap,myObject1);
??System.out.println(myObject1.getMyobject2().getMysub1().getName());
??System.out.println(myObject1.getMyobject2().getMysub1().getPassword());
??System.out.println(myObject1.getMyobject2().getMysub1().getMobile());
??System.out.println(myObject1.getMyobject2().getMysub2().getName());
??System.out.println(myObject1.getMyobject2().getName());
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写一个util方法，返回对象myObject1，同时上面的所有子对象如果没有则自动创建?
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util方法如下：
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public static Object getParentObject(Map<String,Object> resultMap, Object myObject1){
??String classMap = "";
??Iterator<String> ite = resultMap.keySet().iterator();
??while( ite.hasNext() ){
???classMap = ite.next();
???String value = (String)resultMap.get(classMap);
???classMap = classMap.replace(".", ",");
???String[] classes = classMap.split(",");
???try {
????Class temp = myObject1.getClass();
????Method[] methods = temp.getDeclaredMethods();
????
????Object[] subArray = new Object[classes.length-1];
????
????for( int i = 0; i < subArray.length; i++ ){
?????if( i != subArray.length-1 ){
??????subArray[i] = null;
?????}
?????if( i != 0 ){
??????methods = subArray[i-1].getClass().getDeclaredMethods();
?????}
?????for( Method method : methods ){
??????if( method.getName().startsWith("set") && method.getParameterTypes().length > 0 && method.getName().substring(3).equalsIgnoreCase(classes[i+1]) ){
???????if( i != subArray.length -1 ){
????????subArray[i] = Class.forName(method.getParameterTypes()[0].getName()).newInstance();
???????}
???????if( i == 0 ){
????????Method getterMethod = myObject1.getClass().getMethod("get"+method.getName().substring(3), null);
????????if( getterMethod.invoke(myObject1, null) != null ){
?????????subArray[i] = getterMethod.invoke(myObject1, null);
????????}
????????method.invoke(myObject1, subArray[i]);
???????}else if( i == subArray.length -1? ){
????????method.invoke(subArray[i-1], value);
???????}else{
????????Method getterMethod = subArray[i-1].getClass().getMethod("get"+method.getName().substring(3), null);
????????if( getterMethod.invoke(subArray[i-1], null) != null ){
?????????subArray[i] = getterMethod.invoke(subArray[i-1], null);
????????}
????????method.invoke(subArray[i-1], subArray[i]);
???????}
??????}
?????}
????}
????
???} catch (InstantiationException e) {
????e.printStackTrace();
???} catch (IllegalAccessException e) {
????e.printStackTrace();
???} catch (IllegalArgumentException e) {
????e.printStackTrace();
???} catch (InvocationTargetException e) {
????e.printStackTrace();
???} catch (ClassNotFoundException e) {
????e.printStackTrace();
???} catch (SecurityException e) {
????e.printStackTrace();
???} catch (NoSuchMethodException e) {
????e.printStackTrace();
???}
??}
??
??return myObject1;
?}
