通过调用 getFoo 和 setFoo 存取方法,为符合标准 Java 约定的属性构造一个PropertyDescriptor public PropertyDescriptor(String propertyName, Class<?> beanClass) 该构造函数使用简单属性的名称,以及读取和写入属性的方法名称 public PropertyDescriptor(String propertyName, Class<?> beanClass, String readMethodName, String writeMethodName) 此构造函数使用简单属性的名称,以及用于读取和写入属性的Method对象。 public PropertyDescriptor(String propertyName, Method readMethod, Method writeMethod)
测试
@Test
public void show() throws Exception {
Class clazz = UserInfo.class;
PropertyDescriptor p = new PropertyDescriptor("name", clazz);
System.out.println("显示属性描述类:" + p);
}
显示属性描述类: java.beans.PropertyDescriptor[ name=name; propertyType=class java.lang.String; readMethod=public java.lang.String com.example.feizhou.model.UserInfo.getName(); writeMethod=public void com.example.feizhou.model.UserInfo.setName(java.lang.String) ]
获取属性的setter方法
测试
@Test
public void getWriteMethod() throws Exception {
Object obj = clazz.newInstance();
//setter方法给属性赋值
Method method = pd.getWriteMethod();
method.invoke(obj, "xiaoming");
System.out.println(obj.toString());
}
输出 UserInfo{name=’xiaoming’}
获取属性的getter方法
测试
@Test
public void getReadMethod() throws Exception {
Object obj = clazz.newInstance();
Field field = clazz.getDeclaredField("name");
field.setAccessible(true);
field.set(obj, "xiaoming");
//getter方法给属性赋值
Method method = pd.getReadMethod();
method.invoke(obj);
System.out.println(obj.toString());
}
输出: UserInfo{name=’xiaoming’}
获取属性的类型
测试
@Test
public void getPropertyType() throws Exception {
Class<?> propertyType = pd.getPropertyType();
System.out.println("propertyType:"+propertyType);
}
输出: propertyType:class java.lang.String
设置用于读取属性值的方法
测试
@Test
public void setReadMethod() throws Exception {
Object obj = clazz.newInstance();
Method getName2=clazz.getDeclaredMethod("getName2");
//设置读属性的方法
pd.setReadMethod(getName2);
//获取读属性的方法
Method method = pd.getReadMethod();
Object invoke = method.invoke(obj);
System.out.println(invoke.toString());
}
输出:getName2
设置用于写入属性值的方法
测试
@Test
public void setWriteMethod() throws Exception {
Object obj = clazz.newInstance();
Method setName2=clazz.getDeclaredMethod("setName2",String.class);
//设置写属性的方法
pd.setWriteMethod(setName2);
//获取写属性的方法
Method method = pd.getWriteMethod();
method.invoke(obj,"1111");
System.out.println(obj);
}
输出: UserInfo{name=’1111′}
测试的数据
package com.example.feizhou.ex;
import com.example.feizhou.model.UserInfo;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import java.beans.PropertyDescriptor;
import java.beans.PropertyEditor;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
/**
* @author hui
* @description
* @create 2018/8/30 上午11:29
*/
public class PropertyDescriptorTest {
private Class clazz;
private PropertyDescriptor pd;
@BeforeTest
public void init() throws Exception {
this.clazz = UserInfo.class;
this.pd = new PropertyDescriptor("name", clazz);
}
@Test
public void show() throws Exception {
Class clazz = UserInfo.class;
PropertyDescriptor p = new PropertyDescriptor("name", clazz);
System.out.println("显示属性描述类:" + p);
}
@Test
public void getWriteMethod() throws Exception {
Object obj = clazz.newInstance();
//setter方法给属性赋值
Method method = pd.getWriteMethod();
method.invoke(obj, "xiaoming");
System.out.println(obj.toString());
}
@Test
public void getReadMethod() throws Exception {
Object obj = clazz.newInstance();
Field field = clazz.getDeclaredField("name");
field.setAccessible(true);
field.set(obj, "xiaoming");
//setter方法给属性赋值
Method method = pd.getReadMethod();
method.invoke(obj);
System.out.println(obj.toString());
}
@Test
public void getPropertyType() throws Exception {
Class<?> propertyType = pd.getPropertyType();
System.out.println("propertyType:"+propertyType);
}
@Test
public void setReadMethod() throws Exception {
Object obj = clazz.newInstance();
Method getName2=clazz.getDeclaredMethod("getName2");
//设置读属性的方法
pd.setReadMethod(getName2);
//获取读属性的方法
Method method = pd.getReadMethod();
Object invoke = method.invoke(obj);
System.out.println(invoke.toString());
}
@Test
public void setWriteMethod() throws Exception {
Object obj = clazz.newInstance();
Method setName2=clazz.getDeclaredMethod("setName2",String.class);
//设置写属性的方法
pd.setWriteMethod(setName2);
//获取写属性的方法
Method method = pd.getWriteMethod();
method.invoke(obj,"1111");
System.out.println(obj);
}
}
---------------------------------------
public class UserInfo {
private String name;
public String getName() {
return name;
}
public String getName2() {
return "getName2";
}
public void setName(String name) {
this.name = name;
}
public void setName2(String name) {
this.name = name;
}
@Override
public String toString() {
return "UserInfo{" +
"name='" + name + '\'' +
'}';
}
}
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