map转实体类

利用反射，可将Map<String,Object>对象转成真正的实体类。

/**
	 * 把Map<String,Object>处理成实体类
	 * @param clazz		想要的实体类
	 * @param map		包含信息的Map对象
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static Object mapToObject(Class clazz, Map<String,Object> map){
		
		if(null == map){
			return null;
		}
		
		Field[] fields = clazz.getDeclaredFields();	//取到类下所有的属性，也就是变量名
		Field field;
		Object o = null;
		try {
			o = clazz.newInstance();
		} catch (InstantiationException e1) {
			e1.printStackTrace();
		} catch (IllegalAccessException e1) {
			e1.printStackTrace();
		}
		for(int i=0; i<fields.length; i++){
			field = fields[i];
			String fieldName = field.getName();
			//把属性的第一个字母处理成大写
			String stringLetter=fieldName.substring(0, 1).toUpperCase();    
			//取得set方法名，比如setBbzt
			String setterName="set"+stringLetter+fieldName.substring(1);    
			//真正取得set方法。
			Method setMethod = null;
			Class fieldClass = field.getType();
			try {
				if(isHaveSuchMethod(clazz, setterName)){
					if(fieldClass == String.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, String.valueOf(map.get(fieldName)));//为其赋值 
					}else if(fieldClass == Integer.class || fieldClass == int.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, Integer.parseInt(String.valueOf(map.get(fieldName))));//为其赋值 
					}else if(fieldClass == Boolean.class || fieldClass == boolean.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, Boolean.getBoolean(String.valueOf(map.get(fieldName))));//为其赋值 
					}else if(fieldClass == Short.class || fieldClass == short.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, Short.parseShort(String.valueOf(map.get(fieldName))));//为其赋值 
					}else if(fieldClass == Long.class || fieldClass == long.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, Long.parseLong(String.valueOf(map.get(fieldName))));//为其赋值 
					}else if(fieldClass == Double.class || fieldClass == double.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, Double.parseDouble(String.valueOf(map.get(fieldName))));//为其赋值 
					}else if(fieldClass == Float.class || fieldClass == float.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, Float.parseFloat(String.valueOf(map.get(fieldName))));//为其赋值 
					}else if(fieldClass == BigInteger.class ){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, BigInteger.valueOf(Long.parseLong(String.valueOf(map.get(fieldName)))));//为其赋值 
					}else if(fieldClass == BigDecimal.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						setMethod.invoke(o, BigDecimal.valueOf(Long.parseLong(String.valueOf(map.get(fieldName)))));//为其赋值 
					}else if(fieldClass == Date.class){
						setMethod = clazz.getMethod(setterName, fieldClass);
						if(map.get(fieldName).getClass() == java.sql.Date.class){
							setMethod.invoke(o, new Date(((java.sql.Date)map.get(fieldName)).getTime()));//为其赋值 
						}else if(map.get(fieldName).getClass() == java.sql.Time.class){
							setMethod.invoke(o, new Date(((java.sql.Time)map.get(fieldName)).getTime()));//为其赋值 
						}else if(map.get(fieldName).getClass() == java.sql.Timestamp.class){
							setMethod.invoke(o, new Date(((java.sql.Timestamp)map.get(fieldName)).getTime()));//为其赋值 
						}
					}
				}
			} catch (SecurityException e) {
				e.printStackTrace();
			} catch (NoSuchMethodException e) {
				e.printStackTrace();
			}   catch (IllegalArgumentException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				e.printStackTrace();
			}	
			
		}
		return o;
	}

/**
	 * 判断某个类里是否有某个方法
	 * @param clazz
	 * @param methodName
	 * @return
	 */
	public static boolean isHaveSuchMethod(Class<?> clazz, String methodName){
		Method[] methodArray = clazz.getMethods();
		boolean result = false;
		if(null != methodArray){
			for(int i=0; i<methodArray.length; i++){
				if(methodArray[i].getName().equals(methodName)){
					result = true;
					break;
				}
			}
		}
		return result;
	}