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java - 多维 map

In lại 作者：行者123 更新时间：2023-12-02 11:54:02 29 4
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我在大学时正在编写 Android 应用程序。

用户被询问必须回答的问题。

我通过服务器的 HTTP 请求/响应获取问题。它们以字符串形式传递。该字符串看起来像这样，有两个问题:

(requestedQuestion):

    id: 1
    question: Mit was stylet man HTML?
    answer1: PHP
    answer2: C++
    answer3: Java
    answer4: CSS
    answerR: 4
    picture:
    kind: 4
    category: Webprogrammierung
    semester: 2
    difficulty: 1
    ranking:
    report:
    moderated:
    id: 2
    question: Wie viele Bits hat ein Byte?
    answer1: 4
    answer2: 8
    answer3:
    answer4:
    answerR: 2
    picture:
    kind: 2
    category: Informatik
    semester: 1
    difficulty: 2
    ranking:
    report:
    moderated:

我想将字符串放入多维映射中，以便更好地访问每个属性。

目前我们有一个简单的 map 生成器，可以生成法线贴图，但这无法正常工作:

HashMap map = new HashMap();
  String payload = requestedQuestion;
  String[] keyVals = payload.split("\\s*\n");
  for(String keyVal:keyVals) {
    String[] parts = keyVal.split(":", 2);
    map.put(parts[0],parts[1]);
  }

我想要一个像这样的多维(JSON 响应)映射，以便我们可以访问每个问题及其属性:

Map: {question1=
        {
        id= 1,
        question= Mit was stylet man HTML?,
        answer1= PHP,
        answer2= C++,
        answer3= Java,
        answer4= CSS,
        answerR= 4,
        picture=,
        kind= 4,
        category= Webprogrammierung,
        semester= 2,
        difficulty= 1,
        ranking=,
        report=,
        moderated=
        },
      question2=
        {
        id= 2,
        question= Wie viele Bits hat ein Byte?,
        answer1= 4,
        answer2= 8,
        answer3=,
        answer4=,
        answerR= 2,
        picture=,
        kind= 2,
        category= Informatik,
        semester= 1,
        difficulty= 2,
        ranking=,
        report=,
        moderated=
        }
     }

1 Câu trả lời

从服务器提供 JSON 答案更为自然:

{ 
    "id": 1,
    "question": "Mit was stylet man HTML?",
    "answers" : [ 
        { "value": "PHP" },
        { "value" : "C++"}, 
        { "value" : "Java"},
        { "value" : "CSS"}
    ],
    "rightAnswer": 4,
    "kind": 4,
    "category": "Webprogrammierung",
    "semester": 2,
    "difficulty": 1
}

有关 JSON 的更多信息，您可以查看此 liên kết

Sau đó trong Android 中您可以使用 GSON或其他一些库来解析 JSON 响应。

您需要创建 POJO 对象并使用 GSON 注释映射它们。这是我之前提供的 JSON của Objects Ví dụ:

câu hỏi:

public class Question {

    @SerializedName("id")
    @Expose
    private Integer id;
    @SerializedName("question")
    @Expose
    private String question;
    @SerializedName("answers")
    @Expose
    private List answers = null;
    @SerializedName("rightAnswer")
    @Expose
    private Integer rightAnswer;
    @SerializedName("kind")
    @Expose
    private Integer kind;
    @SerializedName("category")
    @Expose
    private String category;
    @SerializedName("semester")
    @Expose
    private Integer semester;
    @SerializedName("difficulty")
    @Expose
    private Integer difficulty;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getQuestion() {
        return question;
    }

    public void setQuestion(String question) {
        this.question = question;
    }

    public List getAnswers() {
        return answers;
    }

    public void setAnswers(List answers) {
        this.answers = answers;
    }

    public Integer getRightAnswer() {
        return rightAnswer;
    }

    public void setRightAnswer(Integer rightAnswer) {
        this.rightAnswer = rightAnswer;
    }

    public Integer getKind() {
        return kind;
    }

    public void setKind(Integer kind) {
        this.kind = kind;
    }

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public Integer getSemester() {
        return semester;
    }

    public void setSemester(Integer semester) {
        this.semester = semester;
    }

    public Integer getDifficulty() {
        return difficulty;
    }

    public void setDifficulty(Integer difficulty) {
        this.difficulty = difficulty;
    }
}

答案:

    public class Answer {

    @SerializedName("value")
    @Expose
    private String value;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

}

让我们假设您收到 Sợi dây 格式的响应并将其存储在 response 变量中

String response; // store here response of your server request

然后只需使用GSON来解析该Sợi dây:

Gson gson = new Gson();
Qustion question = gson.fromJson(response, Question.class);

现在你有了Câu hỏi对象。您可以通过下一种方式访问字段

List answers = quesion.getAnswers();

关于java - 多维 map ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47713456/

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