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用内省来操作Bean会给程序带来很大的便利,特别是在很大的实体对象的时候,在其属性很多的时候要为其赋值的时候,
package com.bean;
public class User {
private String uid;
private String userName;
private String userPass;
private String age;
private String sex;
public User(){}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPass() {
return userPass;
}
public void setUserPass(String userPass) {
this.userPass = userPass;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public User(String uid, String userName, String userPass, String age,
String sex) {
super();
this.uid = uid;
this.userName = userName;
this.userPass = userPass;
this.age = age;
this.sex = sex;
}
@Override
public String toString() {
return "User [uid=" + uid + ", userName=" + userName + ", userPass="
+ userPass + ", age=" + age + ", sex=" + sex + "]";
}
}
package com.bean;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
public class beanUtils {
/**
* java内省
* @param args
* @throws IntrospectionException
* @throws InvocationTargetException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public static void main(String[] args) throws IntrospectionException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
BeanInfo beanInfo = Introspector.getBeanInfo(User.class, Object.class);
PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
User user = new User();
for(PropertyDescriptor pd : pds){
System.out.println(pd.getName());
}
PropertyDescriptor pd = new PropertyDescriptor("age", User.class);
pd.getWriteMethod().invoke(user, "22");
System.out.println(pd.getReadMethod().invoke(user));
}
}
age sex uid userName userPass 22
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原文地址：http://www.cnblogs.com/dbqjava/p/5327966.html
