map转化为对象

来源：互联网发布：首选网络类型哪个好编辑：程序博客网时间：2024/06/04 18:44

如何把Map 转化为指定对象呢?
先看测试:

@Test    public void test_convertMap2Obj() throws InstantiationException, IllegalAccessException, SecurityException, NoSuchFieldException, IllegalArgumentException{        Map map=new HashMap();        map.put("personName", "黄威");        map.put("birthdate", new Timestamp(1000255));        map.put("identitify", "422203158895255555");        map.put("age", 21);        Object obj=ReflectHWUtils.convertMap2Obj(map, Person2.class);        Person2 person=(Person2)obj;//      System.out.println(obj);        System.out.println(person.getPersonName());        System.out.println(person.getAge());        System.out.println(person.getBirthdate());    }

运行结果:
黄威
21
1970-01-01 08:16:40.255

ReflectHWUtils.convertMap2Obj实现如下:

/***     * convert map to object ,see setObjectValue(obj, map)     * @param map : key是对象的成员变量,其value就是成员变量的值     * @param clazz     * @return     * @throws InstantiationException     * @throws IllegalAccessException     * @throws SecurityException     * @throws NoSuchFieldException     * @throws IllegalArgumentException     */    public static Object convertMap2Obj(Map<String, Object> map,Class clazz) throws InstantiationException, IllegalAccessException, SecurityException, NoSuchFieldException, IllegalArgumentException{        if(ValueWidget.isNullOrEmpty(map)){            return null;        }        Object obj=clazz.newInstance();        setObjectValue(obj, map);        /*for(Iterator it=map.entrySet().iterator();it.hasNext();){            Map.Entry<String, Object> entry=(Map.Entry<String, Object>)it.next();            String key=entry.getKey();            Object val=entry.getValue();        }*/        return obj;    }/***     * 利用反射设置对象的属性值. 注意:属性可以没有setter 方法.     *      * @param obj     * @param params     * @throws SecurityException     * @throws NoSuchFieldException     * @throws IllegalArgumentException     * @throws IllegalAccessException     */    public static void setObjectValue(Object obj, Map<String, Object> params)            throws SecurityException, NoSuchFieldException,            IllegalArgumentException, IllegalAccessException {        if(ValueWidget.isNullOrEmpty(obj)){            return;        }        if (ValueWidget.isNullOrEmpty(params)) {            return;        }        Class<?> clazz = obj.getClass();        for (Iterator it = params.entrySet().iterator(); it.hasNext();) {            Map.Entry<String, Object> entry = (Map.Entry<String, Object>) it                    .next();            String key = entry.getKey();            Object propertyValue = entry.getValue();            if (ValueWidget.isNullOrEmpty(propertyValue)) {                continue;            }            Field name = getSpecifiedField(clazz, key);            if (name != null) {                name.setAccessible(true);                name.set(obj, propertyValue);            }        }    }

依赖的方法:

/***     * 利用反射设置对象的属性值. 注意:属性可以没有setter 方法.     *      * @param obj     * @param params     * @throws SecurityException     * @throws NoSuchFieldException     * @throws IllegalArgumentException     * @throws IllegalAccessException     */    public static void setObjectValue(Object obj, Map<String, Object> params)            throws SecurityException, NoSuchFieldException,            IllegalArgumentException, IllegalAccessException {        if(ValueWidget.isNullOrEmpty(obj)){            return;        }        if (ValueWidget.isNullOrEmpty(params)) {            return;        }        Class<?> clazz = obj.getClass();        for (Iterator it = params.entrySet().iterator(); it.hasNext();) {            Map.Entry<String, Object> entry = (Map.Entry<String, Object>) it                    .next();            String key = entry.getKey();            Object propertyValue = entry.getValue();            if (ValueWidget.isNullOrEmpty(propertyValue)) {                continue;            }            Field name = getSpecifiedField(clazz, key);            if (name != null) {                name.setAccessible(true);                name.set(obj, propertyValue);            }        }    }    /***     * Get Specified Field     *      * @param clazz     * @param fieldName     * @return     */    public static Field getSpecifiedField(Class<?> clazz, String fieldName) {        Field f = null;        if (ValueWidget.isNullOrEmpty(clazz)||ValueWidget.isNullOrEmpty(fieldName)) {            return null;        }        try {            f = clazz.getDeclaredField(fieldName);        } catch (NoSuchFieldException e) {            Class superClass2=clazz.getSuperclass();            if (superClass2.getName().equals(Object.class.getName())){                return null;            }            return getSpecifiedField(superClass2/*                                                         * may be null if it is                                                         * Object .                                                         */, fieldName);            // e.printStackTrace();        }        return f;    }

源代码见:
源代码下载地址
跨浏览器实现placeholder

0 0