package com.zhoushun; 
import java.lang.reflect.Method; 
import java.lang.reflect.Field; 
import java.beans.PropertyDescriptor; 
 
public class PropertyUtil { 
 @SuppressWarnings("unchecked") 
 public static PropertyDescriptor getPropertyDescriptor(Class clazz, String propertyName) { 
  StringBuffer sb = new StringBuffer();//構(gòu)建一個(gè)可變字符串用來構(gòu)建方法名稱 
  Method setMethod = null; 
  Method getMethod = null; 
  PropertyDescriptor pd = null; 
  try { 
   Field f = clazz.getDeclaredField(propertyName);//根據(jù)字段名來獲取字段 
   if (f!= null) { 
    //構(gòu)建方法的后綴 
    String methodEnd = propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); 
    sb.append("set" + methodEnd);//構(gòu)建set方法 
    setMethod = clazz.getDeclaredMethod(sb.toString(), new Class[]{ f.getType() }); 
    sb.delete(0, sb.length());//清空整個(gè)可變字符串 
    sb.append("get" + methodEnd);//構(gòu)建get方法 
    //構(gòu)建get 方法 
    getMethod = clazz.getDeclaredMethod(sb.toString(), new Class[]{ }); 
    //構(gòu)建一個(gè)屬性描述器 把對應(yīng)屬性 propertyName 的 get 和 set 方法保存到屬性描述器中 
    pd = new PropertyDescriptor(propertyName, getMethod, setMethod); 
   } 
  } catch (Exception ex) { 
    ex.printStackTrace(); 
  } 
  
  return pd; 
 } 
  
 @SuppressWarnings("unchecked") 
 public static void setProperty(Object obj,String propertyName,Object value){ 
  Class clazz = obj.getClass();//獲取對象的類型 
  PropertyDescriptor pd = getPropertyDescriptor(clazz,propertyName);//獲取 clazz 類型中的 propertyName 的屬性描述器 
  Method setMethod = pd.getWriteMethod();//從屬性描述器中獲取 set 方法 
  try { 
   setMethod.invoke(obj, new Object[]{value});//調(diào)用 set 方法將傳入的value值保存屬性中去 
  }catch (Exception e){ 
   e.printStackTrace(); 
  } 
 } 
  
 @SuppressWarnings("unchecked") 
 public static Object getProperty(Object obj, String propertyName){ 
  Class clazz = obj.getClass();//獲取對象的類型 
  PropertyDescriptor pd = getPropertyDescriptor(clazz,propertyName);//獲取 clazz 類型中的 propertyName 的屬性描述器 
  Method getMethod = pd.getReadMethod();//從屬性描述器中獲取 get 方法 
  Object value =null ; 
  try { 
   value = getMethod.invoke(clazz, new Object[]{});//調(diào)用方法獲取方法的返回值 
  } catch (Exception e) { 
   e.printStackTrace(); 
  } 
  return value;//返回值 
 } 
} 

public boolean setValue(Object objSet, Object objGet) 
  throws IllegalArgumentException, SecurityException, InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException, IntrospectionException 
 { 
  boolean flag = true; 
  Field fields[] = objSet.getClass().getDeclaredFields(); 
  String value = ""; 
  String fieldNameGet = ""; 
  List list = new ArrayList(); 
  Field afield[]; 
  int j = (afield = fields).length; 
  for(int i = 0; i < j; i++) 
  { 
   Field field = afield[i]; 
   String fieldName = field.getName(); 
   fieldNameGet = xmlToModel(fieldName); 
   if(!"error".equals(fieldNameGet)) 
   { 
    PropertyDescriptor pd = new PropertyDescriptor(fieldNameGet, objGet.getClass()); 
    Method getMethod = pd.getReadMethod(); 
    value = String.valueOf(getMethod.invoke(objGet, new Object[0])); 
    boolean checkResult = returnMessage.checkValue(value, fieldNameGet); 
    if(checkResult) 
    { 
     PropertyDescriptor pd1 = new PropertyDescriptor(fieldName, objSet.getClass()); 
     Method setMethod = pd1.getWriteMethod(); 
     setMethod.invoke(objSet, new Object[] { 
      field.getType().getConstructor(new Class[] { 
       java/lang/String 
      }).newInstance(new Object[] { 
       value 
      }) 
     }); 
    } else 
    { 
     flag = checkResult; 
    } 
   } 
  } 
 
  return flag; 
 } 

import java.beans.PropertyDescriptor; 
import java.lang.reflect.Field; 
import java.lang.reflect.Method; 
public class ReflectTest { 
 
 public static void main(String[] args) throws Exception { 
 Class clazz = Class.forName("TaskProvidePropsList");//這里的類名是全名。。有包的話要加上包名 
 Object obj = clazz.newInstance(); 
 Field[] fields = clazz.getDeclaredFields(); 
 //寫數(shù)據(jù) 
 for(Field f : fields) { 
 PropertyDescriptor pd = new PropertyDescriptor(f.getName(), clazz); 
 Method wM = pd.getWriteMethod();//獲得寫方法 
 wM.invoke(obj, 2);//因?yàn)橹朗莍nt類型的屬性，所以傳個(gè)int過去就是了。。實(shí)際情況中需要判斷下他的參數(shù)類型 
 } 
 //讀數(shù)據(jù) 
 for(Field f : fields) { 
 PropertyDescriptor pd = new PropertyDescriptor(f.getName(), clazz); 
 Method rM = pd.getReadMethod();//獲得讀方法 
 Integer num = (Integer) rM.invoke(obj);//因?yàn)橹朗莍nt類型的屬性,所以轉(zhuǎn)換成integer就是了。。也可以不轉(zhuǎn)換直接打印 
 System.out.println(num); 
 } 
 } 
}