import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Timestamp;
class Person {
private String name;
private int age;
private Timestamp birth;
public Timestamp getBirth() {
return birth;
}
public void setBirth(Timestamp birth) {
this.birth = birth;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
public int getAge() {
return this.age;
}
}
/*****************************************************/
public class InvokeSetterMethod {
public static void main(String[] args) {
Person p = new Person();
invokeSetterMethodByType(p, Person.class, "java.sql.Timestamp",
Timestamp.valueOf("1111-11-11 11:11:11"), Timestamp.class);
p.setBirth(Timestamp.valueOf("2014-12-11 00:00:00"));
System.out.println(p.getBirth());
}
/**
* 调用setter方法
*
* @param obj
* @param att
* @param value
* @param type
*/
public static void invokeSetterMethodByType(Object obj, Class cl,
String methodType, Timestamp param, Class paramType) {
try {
Field[] f = cl.getDeclaredFields();
for (Field field : f) {
// 属性类型
String type = field.getType().getName();
// 属性名
String name = field.getName();
// 属性值
PropertyDescriptor pd = new PropertyDescriptor(field.getName(),
cl);
Method getMethod = pd.getReadMethod();
Object o = getMethod.invoke(obj);
// 当Timestamp类型的属性值为null时，设置默认值
if (methodType.equals(type) && null == o) {
setter(obj, name, param, paramType);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 调用setter方法
*
* @param obj
* @param att
* @param value
* @param type
*/
public static void setter(Object obj, String att, Object value,
Class type) {
try {
Method met = obj.getClass().getMethod("set" + initStr(att), type);
met.invoke(obj, value);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 调用getter方法
*
* @param obj
* @param att
*/
public static void getter(Object obj, String att) {
try {
Method met = obj.getClass().getMethod("get" + initStr(att));
System.out.println(met.invoke(obj));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 将单词的首字母大写
*
* @param old
* @return
*/
public static String initStr(String old) {
String str = old.substring(0, 1).toUpperCase() + old.substring(1);
return str;
}
}
Original: https://www.cnblogs.com/qqzy168/p/3798239.html
Author: 嗨,你的益达~~~
Title: java 反射： 当Timestamp类型的属性值为null时，设置默认值
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