Android 反序列化方案对比

Built-in scalar types are
  8 bit: byte (int8), ubyte (uint8), bool
  16 bit: short (int16), ushort (uint16)
  32 bit: int (int32), uint (uint32), float (float32)
  64 bit: long (int64), ulong (uint64), double (float64)
  Vector of any other type (denoted with [type]). Nesting vectors is not supported, instead you can wrap the inner vector in a table.
  string, which may only hold UTF-8 or 7-bit ASCII. For other text encodings or general binary data use vectors ([byte] or [ubyte]) instead.
  References to other tables or structs, enums or unions

namespace com.fbs.app.generated;
table Menu {
    type:string;
    mainmenu:MainmenuDTO;
table MainmenuDTO{
    item:[ItemDTO];//数组
table ItemDTO{
    code:string;
    activity:string;
    iconum:string;
    icon:string;
    type:string;
    extended:string;
    parentid:string;
    localUrl:string;
    authorityHide:string;
    moreentry:string;
    id:string;
    iconUrl:string;
    homeAuth:string;
    classX:string;
    msgtype:string;
    order:string;
    appnum:string;
    packageX:string;
    textSize:string;
    business:string;
    parentflag:string;
    textPostion:string;
    navigateNote:string;
    constructor:string;
    relationId:string;
    textColor:string;
    url:string;
    authority:string;
    name:string;
    textBackground:string;
    hascontent:string;
    DefaultLoad:string;
    menuAuthority:string;
    ShowTitleLine:string;
    turnViewType:string;
root_type Menu;

$ flatc -o ./ --java animal.fbs

private void createFlatBuffersFile(Bean bean) {
FlatBufferBuilder fb = new FlatBufferBuilder(100);
int[] dataArray = new int[bean.menu.mainmenu.item.size()];
        for (com.example.locationapplication.Bean.MenuDTO.MainmenuDTO.ItemDTO itemDTO : bean.menu.mainmenu.item) {
            int itemOffset = ItemDTO.createItemDTO(fb,
                    fb.createString(itemDTO.code),
                    fb.createString(itemDTO.activity),
                    fb.createString(itemDTO.iconum),
                    fb.createString(itemDTO.icon),
                    fb.createString(itemDTO.type),
                    fb.createString(itemDTO.extended),
                    fb.createString(itemDTO.parentid),
                    fb.createString(itemDTO.localUrl),
                    fb.createString(String.valueOf(itemDTO.authorityHide)),
                    fb.createString("" + itemDTO.moreentry),
                    fb.createString(itemDTO.id),
                    fb.createString(itemDTO.iconUrl),
                    fb.createString(itemDTO.homeAuth),
                    fb.createString(itemDTO.classX),
                    fb.createString(itemDTO.msgtype),
                    fb.createString(itemDTO.order + ""),
                    fb.createString(itemDTO.appnum + ""),
                    fb.createString(itemDTO.packageX),
                    fb.createString(itemDTO.textSize + ""),
                    fb.createString(itemDTO.business),
                    fb.createString(itemDTO.parentflag + ""),
                    fb.createString(itemDTO.textPostion),
                    fb.createString(itemDTO.navigateNote),
                    fb.createString(itemDTO.constructor),
                    fb.createString(itemDTO.relationId),
                    fb.createString(itemDTO.textColor),
                    fb.createString(itemDTO.url),
                    fb.createString(itemDTO.authority),
                    fb.createString(itemDTO.name),
                    fb.createString(itemDTO.textBackground),
                    fb.createString(itemDTO.hascontent + ""),
                    fb.createString(itemDTO.defaultLoad + ""),
                    fb.createString(itemDTO.menuAuthority),
                    fb.createString("ShowTitleLine"),
                    fb.createString("turnViewType")
            dataArray[index] = itemOffset;
            index++;
  int itemVector = MainmenuDTO.createItemVector(fb, dataArray); //这个文档没有说明，多试了几个create开头的方法，使用vector可行
int mainmenuDTO = MainmenuDTO.createMainmenuDTO(fb, itemVector);
 int menuOffset = Menu.createMenu(fb,
                fb.createString(bean.menu.type),
                mainmenuDTO
fb.finish(menuOffset);//根据文档来的
ByteBuffer byteBuffer = fb.dataBuffer(); //到此处已经映射完成
outPutTofile(byteBuffer, "/xml_flatbuffer");//打算将文件写入到包名下的files目录下，文件名为xml_flatbuffer
 * 将解析数据持久化到文本
 * @param byteBuffer
* @param filename
private void outPutTofile(ByteBuffer byteBuffer, String filename) {
//        byte[] array = byteBuffer.array(); 这里有坑，直接取array 反序列化不出来，之前一直以为是文件存取的问题，后来发现需要使用buf.get(array);的方式，下面是正确的方式
        ByteBuffer buf = byteBuffer;
        byte[] array = new byte[buf.remaining()];
        buf.get(array);
        try {
            String filePath = getFilesDir() + filename;
            File file = new File(filePath);
            if (!file.exists()) {
                file.createNewFile();
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            fileOutputStream.write(array);
        } catch (IOException e) {
            e.printStackTrace();
    }

try {
            File file = new File(getFilesDir() + "/xml_flatbuffer");
            RandomAccessFile f = new RandomAccessFile(file, "r");
            byte[] data = new byte[(int) f.length()];
            f.readFully(data);
            ByteBuffer bb = ByteBuffer.wrap(data);