java反射给实体类赋值 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

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

/**
 * 获取实体类型的属性名和类型
 * @param model 为实体类
 * @author kou 为传入参数
 */
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();
    }
  }

}