Java 用反射进行Bean类的数据解析与装入

前言

　　下面的代码用Android的SharedPreferences来解析后保存一个Bean对象，或者解析后返回一个Bean对象，这里临时记录。后续会完善

解析实例并且保存

public static void putObject(String key, Object object) {
        Class data = object.getClass(); 　　　　　　//获取对象的类
        Field[] fields = data.getDeclaredFields(); //获取类的声明字段数组
        for (int i = 0; i < fields.length; i++) {
            Field f = fields[i];
            f.setAccessible(true);
            try {
                String spKey = key + f.getName(); //获取字段的名称
                Object value = f.get(object); 　　//根据字段名称获取值
                if (value instanceof Integer) {
                    put(spKey, (int) value);
                } else if (value instanceof String) {
                    put(spKey, (String) value);
                } else if (value instanceof Boolean) {
                    put(spKey, (boolean) value);
                } else if (value instanceof Float) {
                    put(spKey, (float) value);
                } else if (value instanceof Long) {
                    put(spKey, (long) value);
                }else if (value instanceof Object){
                    GsonBuilder gsonb = new GsonBuilder();
                    Gson gson = gsonb.create();
                    String json = gson.toJson(value);
                    put(spKey, json);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

装载并且返回实例

public static <T> T getObject(String key, Class<T> c) {
        T data = null;
        try {
            data = c.newInstance();         //实例传入的类
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

        if (data == null)
            return data;

        Field[] fields = c.getDeclaredFields();     //获取声明字段数组
        for (int i = 0; i < fields.length; i++) {
            Field f = fields[i];
            f.setAccessible(true);
            try {
                String spKey = key + f.getName(); //获取字段名称
                Class valueType = f.getType();      //获取字段类型
                if (valueType == String.class) {    //字段为String类型
                    f.set(data, get(spKey, ""));
                } else if (valueType.getSuperclass() ==Object.class){   //字段是一个Object
                    String jsonObjext = get(spKey, "");
                    GsonBuilder gsonb = new GsonBuilder();
                    Gson gson = gsonb.create();
                    if (!"".equals(jsonObjext) ) {
                        f.set(data, gson.fromJson(jsonObjext,valueType));
                    }else {
                        f.set(data,null);
                    }
                }else if (valueType == int.class || valueType == Integer.class) {   //字段是整数类型
                    f.set(data, get(spKey, 0));
                } else if (valueType == boolean.class || valueType == Boolean.class) {  //字段是布尔值类型
                    f.set(data, get(spKey, false));
                } else if (valueType == float.class || valueType == Float.class) {      //字段是浮点类型
                    f.set(data, get(spKey, 0f));
                } else if (valueType == long.class || valueType == Long.class) {        //字段是Long类型
                    f.set(data, get(spKey, 0l));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        return data;
    }