/**
* 返回字段的类型, 支持多级字段
*
* @param clazz
* @param propertyName
* @return
*/
public static Class getFieldType(Class clazz, String propertyName) {
List<String> props = StringUtil.split(propertyName, ".");
Class cls = clazz;
try {
for (String prop : props) {
Method m = cls.getMethod(getGetterMethodName(prop), new Class[] {});
cls = m.getReturnType();
}
} catch (Exception ex) {
ex.printStackTrace();
cls = null;
}
return cls;
}
/**
* 获取对象的字段的值，支持多级字段链，如：getFeildValue(party, "parentParty.name") 返回party对象的parentParty字段的name的值
*
* @param obj
* @param fieldChain
* @return
*/
public static Object getFieldValue(Object obj, String fieldChain) {
List<String> fieldNames = StringUtil.split(fieldChain, ".");
Object retObj = obj;
for (String fieldName : fieldNames) {
if (retObj == null) {
return null;
}
retObj = getValue(retObj, fieldName);
}
return retObj;
}
/**
* 设置某个对象字段的值，支持多级字段链 如：setFieldValue(party, "parentParty.name", "microsoft")
*
* @param obj
* @param fieldChain
* @param fieldValue
*/
public static Object setFieldValue(Object obj, String fieldChain, Object fieldValue) {
List<String> fieldNames = StringUtil.split(fieldChain, ".");
Object retObj = obj;
Object lastObj = obj;
int size = fieldNames.size();
Class clazz = null;
String fieldName = null;
Field field = null;
Class fieldClass = null;
for (int i = 0; i < size - 1; i++) {
fieldName = fieldNames.get(i);
// log.fine("handle field value: " + fieldName + " of " + lastObj);
retObj = getValue(lastObj, fieldName);
// 如果retObj为空，则构造一个新的实例
if (retObj == null) {
clazz = lastObj.getClass();
try {
field = getField(clazz, fieldName);
field.setAccessible(true);
fieldClass = field.getType();
retObj = fieldClass.newInstance();
setValue(lastObj, fieldName, retObj);
} catch (SecurityException e) {
e.printStackTrace();
return null;
} catch (InstantiationException e) {
e.printStackTrace();
return null;
} catch (IllegalAccessException e) {
e.printStackTrace();
return null;
}
}
lastObj = retObj;
}
if (retObj != null) {
return setValue(retObj, fieldNames.get(size - 1), fieldValue);
} else {
return null;
}
}
/**
* 返回指定类的某个属性的getter方法
*
* @param clazz
* @param propertyName 属性名, 可以是多级属性, 如: partyLocation.location
* @return
*/
public static Method getGetter(Class clazz, String propertyName) {
List<String> props = StringUtil.split(propertyName, ".");
Class cls = clazz;
Method m = null;
for (String prop : props) {
try {
m = cls.getMethod(getGetterMethodName(prop), new Class[] {});
cls = m.getReturnType();
} catch (NoSuchMethodException ex) {
try {
m = cls.getMethod(getBooleanGetterMethodName(prop), new Class[] {});
cls = m.getReturnType();
} catch (NoSuchMethodException ne) {
System.out.println("【ObjectUtil.getGetter】没有这个方法：" + ne.getMessage());
}
} catch (SecurityException ex) {
ex.printStackTrace();
}
}
return m;
}