java反射遍历实体类属性和类型,并赋值和获取值的简单方法

实例如下：

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;


public class GetModelNameAndType
{

  public static void testReflect(Object model) throws SecurityException,
      NoSuchMethodException, IllegalArgumentException,
      IllegalAccessException, InvocationTargetException, InstantiationException
  {
    // 获取实体类的所有属性，返回Field数组
    Field[] field = model.getClass().getDeclaredFields();
    // 获取属性的名字
    String[] modelName = new String[field.length];
    String[] modelType = new String[field.length];
    for (int i = 0; i < field.length; i++)
    {
      // 获取属性的名字
      String name = field[i].getName();
      modelName[i] = name;
      // 获取属性类型
      String type = field[i].getGenericType().toString();
      modelType[i] = type;
      
      //关键。。。可访问私有变量
      field[i].setAccessible(true);
      //给属性设置
      field[i].set(model, field[i].getType().getConstructor(field[i].getType()).newInstance("kou"));

      // 将属性的首字母大写
      name = name.replaceFirst(name.substring(0, 1), name.substring(0, 1)
   .toUpperCase());

      if (type.equals("class java.lang.String"))
      { 
 // 如果type是类类型，则前面包含"class "，后面跟类名
 Method m = model.getClass().getMethod("get" + name);
 // 调用getter方法获取属性值
 String value = (String) m.invoke(model);
 if (value != null)
 {

   System.out.println("attribute value:" + value);
 }

      }
      if (type.equals("class java.lang.Integer"))
      {
 Method m = model.getClass().getMethod("get" + name);
 Integer value = (Integer) m.invoke(model);
 if (value != null)
 {
   System.out.println("attribute value:" + value);
 }
      }
      if (type.equals("class java.lang.Short"))
      {
 Method m = model.getClass().getMethod("get" + name);
 Short value = (Short) m.invoke(model);
 if (value != null)
 {
   System.out.println("attribute value:" + value);
 }
      }
      if (type.equals("class java.lang.Double"))
      {
 Method m = model.getClass().getMethod("get" + name);
 Double value = (Double) m.invoke(model);
 if (value != null)
 {
   System.out.println("attribute value:" + value);
 }
      }
      if (type.equals("class java.lang.Boolean"))
      {
 Method m = model.getClass().getMethod("get" + name);
 Boolean value = (Boolean) m.invoke(model);
 if (value != null)
 {
   System.out.println("attribute value:" + value);
 }
      }
      if (type.equals("class java.util.Date"))
      {
 Method m = model.getClass().getMethod("get" + name);
 Date value = (Date) m.invoke(model);
 if (value != null)
 {
   System.out.println("attribute value:"
+ value.toLocaleString());
 }
      }
    }
  }

  public static void main(String[] args)
  {
    try
    {
      testReflect(new VO());
    }
    catch (SecurityException e)
    {
      e.printStackTrace();
    }
    catch (IllegalArgumentException e)
    {
      e.printStackTrace();
    }
    catch (NoSuchMethodException e)
    {
      e.printStackTrace();
    }
    catch (IllegalAccessException e)
    {
      e.printStackTrace();
    }
    catch (InvocationTargetException e)
    {
      e.printStackTrace();
    }
    catch (InstantiationException e)
    {
      e.printStackTrace();
    }
  }

}

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