GSON阵列，错误消息：期望一个字符串，但是BEGIN_ARRAY [英] GSON Array, Error message: Expected a string but was BEGIN_ARRAY

问题描述

我想为我的数组使用 GSON 。

我看了几个例子，但无法得到它与我的代码一起工作。

使用GSON解析一个JSON数组。

我得到这个错误信息：期望一个字符串，但是在第1行的BEGIN_ARRAY

这个项目的原始教程涵盖了解析Json Objects。

$ b My Json：

  [{
nid：25，
title：生气的家伙 ，
body：fhjk gjj
}，{
nid：24，
title：25 mobile，
身体：25测试tes
}，{
nid：8，
title：新帖子4，
body： sdfsdf sdfsdf
，{
nid：7，
title：new post，
body：sdf sdf sdfsdf
 $] b $ b  

我的代码：

  String finalJson = buffer.toString（）; 
 JSONArray parentArray = new JSONArray（finalJson）; 
 List< ExerciseModel> exerciseModelList = new ArrayList<>（）; 
 
 Gson gson = new Gson（）; 
 for（int i = 0; i< parentArray.length（）; i ++）{
 JSONObject finalObject = parentArray.getJSONObject（i）; 
 ExerciseModel exerciseModel = gson.fromJson（finalObject.toString（），ExerciseModel.class）; 
 exerciseModelList.add（exerciseModel）; 
} 
 
 return exerciseModelList; 
  

我的模特：

  public class ExerciseModel {
 
 private int nid; 
私有字符串标题; 
私人字符串正文; 
 
 public int getNid（）{
 return nid; 
} 
 public void setNid（int nid）{
 this.nid = nid; 
} 
 public String getTitle（）{
 return title; 
} 
 public String toString（）{
 return this.title; 
} 
 public void setTitle（String title）{
 this.title = title; 
} 
 public String getBody（）{
 return body; 
} 
 public void setBody（String body）{
 this.body = body; 
 
 
 $ / code $ / pre 
 
 
预先致谢 
            $ b {
 private String nid; 
 
 public String getNid（）{return this.nid; } 
 
 public void setNid（String nid）{this.nid = nid; } 
 
私有字符串标题; 
 
 public String getTitle（）{return this.title; } 
 
 public void setTitle（String title）{this.title = title; } 
 
私人字符串正文; 
 
 public String getBody（）{return this.body; } 
 
 public void setBody（String body）{this.body = body; } 
 
 
 $ / code> 

GSON代码的代码应该是：

 字符串json =[{\nid\：\25 \，\title \ ：\\ \\生气的家伙\\，\\ \\body \：\fhjk gjj \}，{\nid \：\24 \，\title \\ \\：25 mobile \，\body \：\25 test tes \}，{\nid \：\8 \，\ title \：\new post 4 \，\body \：\sdfsdf sdfsdf \}，{\nid \：\7 \ ，\title \：\new post \，\body \：\sdf sdf sdfsdf \}]; 
类型listOfTestObject = new TypeToken< List< ExerciseModel>>（）{} .getType（）; 
 ArrayList< ExerciseModel> models = new Gson（）。fromJson（json，listOfTestObject）; 
 System.out.println（models.get（0）.getTitle（））; 
  




I want to use GSON for my Array.

I looked at a few examples but could not get it to work with my code.
Using GSON to parse a JSON array.

I get this error message: Expected a string but was BEGIN_ARRAY at line 1 column

The orginal tutorial, I followed for this project covered parsing Json Objects.

My Json:

[{
   "nid": "25",
   "title": "angry guy",
   "body": "fhjk gjj"
}, {
   "nid": "24",
   "title": "25 mobile",
   "body": "25 test tes"
}, {
   "nid": "8",
   "title": "new post 4",
   "body": "sdfsdf sdfsdf"
}, {
   "nid": "7",
   "title": "new post",
   "body": "sdf sdf sdfsdf"
}]

My Code:

String finalJson = buffer.toString();
            JSONArray parentArray = new JSONArray(finalJson);
            List<ExerciseModel> exerciseModelList = new ArrayList<>();

            Gson gson = new Gson();
            for(int i=0; i<parentArray.length(); i++){
                JSONObject finalObject = parentArray.getJSONObject(i);
                ExerciseModel exerciseModel = gson.fromJson(finalObject.toString(), ExerciseModel.class);
                exerciseModelList.add(exerciseModel);
            }

            return exerciseModelList;

My Model:

    public class ExerciseModel {

    private int nid;
    private String title;
    private String body;

    public int getNid() {
        return nid;
    }
    public void setNid(int nid) {
        this.nid = nid;
    }
    public String getTitle() {
        return title;
    }
    public String toString() {
        return this.title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getBody() {
        return body;
    }
    public void setBody(String body) {
        this.body = body;
    }
}

Thanks in advance

解决方案

Your class should be

public class ExerciseModel
{
  private String nid;

  public String getNid() { return this.nid; }

  public void setNid(String nid) { this.nid = nid; }

  private String title;

  public String getTitle() { return this.title; }

  public void setTitle(String title) { this.title = title; }

  private String body;

  public String getBody() { return this.body; }

  public void setBody(String body) { this.body = body; }

}

And code for GSON code should be:

String json = "[{ \"nid\": \"25\", \"title\": \"angry guy\", \"body\": \"fhjk gjj\" }, { \"nid\": \"24\", \"title\": \"25 mobile\", \"body\": \"25 test tes\" }, { \"nid\": \"8\", \"title\": \"new post 4\", \"body\": \"sdfsdf sdfsdf\" }, { \"nid\": \"7\", \"title\": \"new post\", \"body\": \"sdf sdf sdfsdf\" }]";
Type listOfTestObject = new TypeToken<List<ExerciseModel>>() {}.getType();
ArrayList<ExerciseModel> models = new Gson().fromJson(json, listOfTestObject);
System.out.println(models.get(0).getTitle());

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