Apache Commons BeanUtils包学习(5)-BeanUtils实例

BeanUtils相关类的运用：

public class BeanUtilsStudy {

public static void main(String[] args) throws Exception {

PersonBean pbean = new PersonBean("java", 12);

pbean.setP("P属性");

// 定义几个属性名称

String propertyP = "p";

String propertyName = "name";

String propertyAge = "age";

Object returnValue = null;

// **************getProperty与setProperty方法：获取与设置JavaBean的属性**************

// 获取p属性值

returnValue = BeanUtils.getProperty(pbean, propertyP);

System.out.println(returnValue);

// 获取name属性值

returnValue = BeanUtils.getProperty(pbean, propertyName);

System.out.println(returnValue);

// 设置p属性值

BeanUtils.setProperty(pbean, propertyP, "C++");

System.out.println(pbean.getP());

// 设置age属性值

BeanUtils.setProperty(pbean, propertyAge, 24);

System.out.println(pbean.getAge());

// 可以自动帮我们进行类型转换

BeanUtils.setProperty(pbean, propertyAge, "25");

System.out.println(pbean.getAge());

// birthday类型的java.util.Date类，下面这样写在它在定义的是必须要实例化birthday

// java.util.Date有一个setTime()方法可以看作JavaBean

BeanUtils.setProperty(pbean, "birthday.time", new Date().getTime());

System.out.println(pbean.getBirthday());

// **************copyProperties方法：将一个JavaBean的属性copy到另一个JavaBean中**************

// PersonBean2是PersonBean的子类

PersonBean2 pb2 = new PersonBean2();

// 将pbean的属性值copy到pb2属性

BeanUtils.copyProperties(pb2, pbean);

System.out.println(pb2.getName());

// **************describe方法：将javaBean转换成Map对象************** //

Map beanMap = BeanUtils.describe(pbean);

for (Object key : beanMap.keySet()) {

System.out.println(key + "=" + beanMap.get(key));

}

// **************populate方法：将Map中的值设置到javaBean对象************** //

Map<String, Object> map = new HashMap<String, Object>();

map.put("name", ".NET");

map.put("age", 32);

map.put("p", "PPP");

BeanUtils.populate(pbean, map);

System.out.println(pbean.getName() + "/t" + pbean.getAge() + "/t"

+ pbean.getP());

// 还有一个PropertyUtils

returnValue = PropertyUtils.getProperty(pbean, propertyName);

System.out.println(returnValue);

PropertyUtils.setProperty(pbean, propertyAge, 21);

System.out.println(pbean.getAge());

// PropertyUtils.setProperty(pbean, propertyAge, "21");不能自动进行类型转换

}

}

其中用的JavaBean如下：

public class PersonBean {

private String name;

private int age;

private Date birthday = new Date();

private String x;

public PersonBean() {

}

public PersonBean(String name, int age) {

this.name = name;

this.age = age;

}

public String getP() {

return x;

}

public void setP(String p) {

this.x = p;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

public class PersonBean2 extends PersonBean {

private String address;

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

}