利用反射，将Map转化为Object

已经知道对象的类型，以及属性对应的值，且值保存在map对象中，将该map转换为已知类型的对象。

	/**
	 * 将Map对象通过反射机制转换成Bean对象
	 * 
	 * @param map存放数据的map对象
	 * @param clazz待转换的class
	 * @return 转换后的Bean对象
	 * @throws Exception异常
	 */
	public static Object mapToBean(Map<String, Object> map, Class<?> clazz) throws Exception {
		Object object = clazz.newInstance();
		if (map != null && map.size() > 0) {
			for (Map.Entry<String, Object> entry : map.entrySet()) {
				String propertyName = entry.getKey(); // 属性名
				Object value = entry.getValue();
				String setMethodName = "set" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);
				Field field = getClassField(clazz, propertyName);
				if (field == null)
					continue;
				Class<?> fieldTypeClass = field.getType();
				value = convertValType(value, fieldTypeClass);
				try {
					clazz.getMethod(setMethodName, field.getType()).invoke(object, value);
				} catch (NoSuchMethodException e) {
					e.printStackTrace();
				}
			}
		}
		return object;
	}

	/**
	 * 获取指定字段名称查找在class中的对应的Field对象(包括查找父类)
	 * 
	 * @param clazz指定的class
	 * @param fieldName字段名称
	 * @return Field对象
	 */
	private static Field getClassField(Class<?> clazz, String fieldName) {
		if (Object.class.getName().equals(clazz.getName())) {
			return null;
		}
		Field[] declaredFields = clazz.getDeclaredFields();
		for (Field field : declaredFields) {
			if (field.getName().equals(fieldName)) {
				return field;
			}
		}

		Class<?> superClass = clazz.getSuperclass();
		if (superClass != null) {// 简单的递归一下
			return getClassField(superClass, fieldName);
		}
		return null;
	}

	/**
	 * 将Object类型的值，转换成bean对象属性里对应的类型值
	 * 
	 * @param value,Object对象值
	 * @param fieldTypeClass属性的类型
	 * @return 转换后的值
	 */
	private static Object convertValType(Object value, Class<?> fieldTypeClass) {
		Object retVal = null;
		if (Long.class.getName().equals(fieldTypeClass.getName())
				|| long.class.getName().equals(fieldTypeClass.getName())) {
			retVal = Long.parseLong(value.toString());
		} else if (Integer.class.getName().equals(fieldTypeClass.getName())
				|| int.class.getName().equals(fieldTypeClass.getName())) {
			retVal = Integer.parseInt(value.toString());
		} else if (Float.class.getName().equals(fieldTypeClass.getName())
				|| float.class.getName().equals(fieldTypeClass.getName())) {
			retVal = Float.parseFloat(value.toString());
		} else if (Double.class.getName().equals(fieldTypeClass.getName())
				|| double.class.getName().equals(fieldTypeClass.getName())) {
			retVal = Double.parseDouble(value.toString());
		} else {
			retVal = value;
		}
		return retVal;
	}

public class Student {
	private String name;
	private Integer age;
	private String hobbies;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public String getHobbies() {
		return hobbies;
	}

	public void setHobbies(String hobbies) {
		this.hobbies = hobbies;
	}

Test

	Map<String, Object> map = new HashMap<String, Object>();
		map.put("name", "scofield");
		map.put("age", 20);
		map.put("hobbies", "music、riding");

		try {
			Student student = (Student) Util.mapToBean(map, Student.class);
			System.out.println(student.getName());
			System.out.println(student.getAge());
			System.out.println(student.getHobbies());
		} catch (Exception e) {
			e.printStackTrace();
		}