android读写删json

private void DeleteJsonStream(String filesavepath) {//删除json对应的数据

List<DownloadInfo> readJsonStreams = readJsonStream();

for (int i = 0; i < readJsonStreams.size(); i++) {

if (readJsonStreams.get(i).getFileSavePath().equals(filesavepath)) {

readJsonStreams.remove(i);

}

}

writeListJsonStream(readJsonStreams);

}

private void writeJsonStream(DownloadInfo downloadInfo) {

List<DownloadInfo> readJsonStreams = readJsonStream();

readJsonStreams.add(downloadInfo);

writeListJsonStream(readJsonStreams);

}

private void writeListJsonStream(List<DownloadInfo> downloadInfos) {//写json数据

String filePath = "/mnt/sdcard/Android/data/com.mw.guahu/files/android_u3d.json";

if (null == downloadInfos)

return;

try {

FileOutputStream fileOutputStream = new FileOutputStream(filePath);

// 开始写JSON数据

JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(fileOutputStream, "UTF-8"));

jsonWriter.beginArray();

for (DownloadInfo info : downloadInfos) {

jsonWriter.beginObject();

jsonWriter.name("url").value(info.getFileSavePath());

jsonWriter.name("image").value(info.getHeadurl());

jsonWriter.endObject();

}

jsonWriter.endArray();

jsonWriter.close();

} catch (Exception e) {

e.printStackTrace();

}

}

private List<DownloadInfo> readJsonStream() {//读json数据

List<DownloadInfo> readJsonStreams = new ArrayList<DownloadInfo>();

String filePath = "/mnt/sdcard/Android/data/com.mw.guahu/files/android_u3d.json";

FileInputStream fileInputStream;

try {

fileInputStream = new FileInputStream(filePath);

JsonReader jsonReader = new JsonReader(new InputStreamReader(fileInputStream, "UTF-8"));

jsonReader.beginArray();

while (jsonReader.hasNext()) {

DownloadInfo downloadInfo = new DownloadInfo();

jsonReader.beginObject();

if (jsonReader.nextName().equals("url")) {

downloadInfo.setFileSavePath(jsonReader.nextString());

}

if (jsonReader.nextName().equals("image")) {

downloadInfo.setHeadurl(jsonReader.nextString());

}

jsonReader.endObject();

readJsonStreams.add(downloadInfo);

}

jsonReader.endArray();

jsonReader.close();

} catch (Exception e) {

e.printStackTrace();

}

return readJsonStreams;

}