Android 中从assets读取text文本中的内容

使用场景：一般情况下如果需要读入外部的数据库内容中的数据，需要把相关的数据库文件放在assets目录下

读取方式：

/**
 * 读取文本数据
 *
 * @param context  程序上下文
 * @param fileName 文件名
 * @return String, 读取到的文本内容，失败返回null
 */
public static String readAssets(Context context, String fileName) {
    InputStream is = null;
    String content = null;
    try {
        is = context.getAssets().open(fileName);
        if (is != null) {

            byte[] buffer = new byte[1024];
            ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
            while (true) {
                int readLength = is.read(buffer);
                if (readLength == -1)
                    break;
                arrayOutputStream.write(buffer, 0, readLength);
            }
            is.close();
            arrayOutputStream.close();
            content = new String(arrayOutputStream.toByteArray());

        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
        content = null;
    } finally {
        try {
            if (is != null)
                is.close();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
    return content;
}

解析方法:读取完成以后需要解析相关的String字符串

               

/**
 * 解析本地text文件
 *
 * @param context
 */
SchoolAddressschoolAddress  =new SchoolAddress();
private void initJSONObject(Context context) {
    if (schoolAddress == null) {
        try {
            String areaStr = FileUtil.readAssets(context, "文件名.txt");
            schoolAddress = GsonUtil.GsonToBean(areaStr, SchoolAddress.class);
        } catch (Exception e) {
            schoolAddress = null;
        }
    }
}

Gson工具类                     

public class GsonUtil {
    private static GsonBuilder gson = null;

    static {
        if (gson == null) {
            gson = new GsonBuilder();
            gson.disableHtmlEscaping();
        }
    }

    private GsonUtil() {
    }


    /**
     * 转成json
     *
     * @param
     * @return
     */
    public static <T> String mapToJson(Map<String, T> map) {
        String gsonString = null;
        if (gson.create() != null) {
            gsonString = gson.create().toJson(map);
        }
        gsonString = gsonString.replace("\\\\", "");//对斜线的转义
        return gsonString;
    }

    /**
     * 转成json
     *
     * @param object
     * @return
     */
    public static String GsonString(Object object) {
        String gsonString = null;
        if (gson.create() != null) {
            gsonString = gson.create().toJson(object);
        }
        gsonString = gsonString.replace("\\\\", "");//对斜线的转义
        return gsonString;
    }

    /**
     * 转成bean
     *
     * @param gsonString
     * @param cls
     * @return
     */
    public static <T> T GsonToBean(String gsonString, Class<T> cls) {
        T t = null;
        if (gson.create() != null) {
            t = gson.create().fromJson(gsonString, cls);
        }
        return t;
    }

    /**
     * 转成list
     *
     * @param gsonString
     * @param cls
     * @return
     */
    public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
        List<T> list = null;
        if (gson.create() != null) {
            list = gson.create().fromJson(gsonString, new TypeToken<List<T>>() {
            }.getType());
        }
        return list;
    }

    /**
     * 转成list中有map的
     *
     * @param gsonString
     * @return
     */
    public static <T> List<Map<String, T>> GsonToListMaps(String gsonString) {
        List<Map<String, T>> list = null;
        if (gson.create() != null) {
            list = gson.create().fromJson(gsonString,
                    new TypeToken<List<Map<String, T>>>() {
                    }.getType());
        }
        return list;
    }

    /**
     * 转成map的
     *
     * @param gsonString
     * @return
     */
    public static <T> Map<String, T> GsonToMaps(String gsonString) {
        Map<String, T> map = null;
        if (gson.create() != null) {
            map = gson.create().fromJson(gsonString, new TypeToken<Map<String, T>>() {
            }.getType());
        }
        return map;
    }
}