java - 如何在android中使用GSON解析json解析

Question

我正在使用 GSON 来解析 Json 数据。我的 Json 数据如下:

{
    "count": "12",
    "colbreak": 1,
    "name": "unary rels",
    "score": "9090",
    "Words": [
        {
            "count": 6,
            "word": "prp_għaċ-",
            "name": "prp_għaċ-",
            "score": 9.1,
            "Words": "kol",
            "seek": 2231297
        }
    ],
    "seek": 0
}

GsonParse.java

public class GsonParse {


 @SerializedName("count")
 public String count;

 @SerializedName("colbreak")
 public String colbreak;

 @SerializedName("name")
 public String count;
 @SerializedName("score")
 public String score;

 @SerializedName("Words")
 public List<Words> mWords = new ArrayList<Words>();

 @SerializedName("seek")
 public String seek;
}

我正在使用下面的方法来解析这个 JSON 数据。

public static <T> ArrayList<T> JsonParse(T t, String response) {
        // convert String into InputStream
        InputStream in = new ByteArrayInputStream(response.getBytes());
        JsonReader reader;
        ArrayList<T> lcs = new ArrayList<T>();
        try {
            reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
            Gson gson = new Gson();

            reader.beginObject();
            while (reader.hasNext()) {

                T cse = (T) gson.fromJson(reader, t.getClass());
                lcs.add(cse);
            }

            reader.endObject();

            /*
             * reader.nextName(); reader.nextString(); reader.nextName();
             * reader.nextString();
             */
            reader.close();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return (ArrayList<T>) lcs;
    }

我遇到以下错误。

03-31 10:14:26.968: E/AndroidRuntime(18578): com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was NAME at line 1 column 73

Answer 1

您可以尝试像这样读取 gson 值:

try {
      AssetManager assetManager = getAssets();
  InputStream ims = assetManager.open("file.txt");

  Gson gson = new Gson();
  Reader reader = new InputStreamReader(ims);

  GsonParse gsonObj = gson.fromJson(reader, GsonParse.class);

     }catch(IOException e) {
       e.printStackTrace();
 }

假设您只收到这个 block 而不是列表。而且此数据当前位于 assets 文件夹中的文件中。您可以将其更改为您要从中读取的流。

您使用的类应该如下所示:

GsonParse.class

public class GsonParse {
 @SerializedName("count")
 private String count;

 @SerializedName("colbreak")
 private String colbreak;

 @SerializedName("name")
 private String name;

 @SerializedName("score")
 private String score;

 @SerializedName("Words")
 private List<Words> mWords = new ArrayList<Words>();

 @SerializedName("seek")
 private String seek;

public String getCount() {
    return count;
}

public void setCount(String count) {
    this.count = count;
}

public String getColbreak() {
    return colbreak;
}

public void setColbreak(String colbreak) {
    this.colbreak = colbreak;
}

private String getName() {
    return name;
}

private void setName(String name) {
    this.name = name;
}

public String getScore() {
    return score;
}

public void setScore(String score) {
    this.score = score;
}

public List<Words> getmWords() {
    return mWords;
}

public void setmWords(List<Words> mWords) {
    this.mWords = mWords;
}

public String getSeek() {
    return seek;
}

public void setSeek(String seek) {
    this.seek = seek;
}
}

Words.class

public class Words {
@SerializedName(value ="count")
private String count;
@SerializedName(value="word")
private String word;
@SerializedName(value="score")
private String name;
@SerializedName(value="Words")
private String words;
@SerializedName(value="seek")
private String seek;

    public String getCount() {
    return count;
}
public void setCount(String count) {
    this.count = count;
}
public String getWord() {
    return word;
}
public void setWord(String word) {
    this.word = word;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getWords() {
    return words;
}
public void setWords(String words) {
    this.words = words;
}
public String getSeek() {
    return seek;
}
public void setSeek(String seek) {
    this.seek = seek;
}
}

words.class 中缺少一个参数，您可以添加它。

GSON 不直接支持 UTF-8 字符。因此，当使用 http 接收响应时，您必须在 http 本身的响应中将其转换为 utf-8 格式。

你可以尝试使用:

String jsonString = new Gson().toJson(objectToEncode);
byte[] utf8JsonString = jsonString.getBytes("UTF8");
responseToClient.write(utf8JsonString, 0, utf8JsonString.Length);