预计BEGIN_ARRAY，但在第1行第2列为BEGIN_OBJECT [英] Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

问题描述

无法分析JSON，原因是：com.google.gson.JsonSyntaxException：
java.lang.IllegalStateException：预期BEGIN_ARRAY，但在第1行第2列为
BEGIN_OBJECT

服务器网址

  public static final String SERVER_URL =https://maps.googleapis.com/maps/api/timezone/ ？JSON位置= -37.8136,144.9631&安培;时间戳= 1389162695&安培;传感器=假; 
  

执行请求

  try {
 //创建一个HTTP客户端
 HttpClient客户端= HttpClientBuilder.create（）。build（）; 
 HttpPost post = new HttpPost（SERVER_URL）; 
 
 //执行请求并检查状态码
 HttpResponse response = client.execute（post）; 
 StatusLine statusLine = response.getStatusLine（）; 
 if（statusLine.getStatusCode（）== 200）{
 HttpEntity entity = response.getEntity（）; 
 InputStream content = entity.getContent（）; 
 
尝试{
 //读取服务器响应并尝试将其解析为JSON 
 Reader reader = new InputStreamReader（content）; 
 
 GsonBuilder gsonBuilder = new GsonBuilder（）; 
 gsonBuilder.setDateFormat（M / d / yy hh：mm a）; 
 Gson gson = gsonBuilder.create（）; 
列表< Post> postsList = Arrays.asList（gson.fromJson（reader，
 Post []。class））; 
 
 content.close（）; 
 
（Post p：postsList）{
 System.out.println（p.timeZoneId）; 
} 
 
} catch（Exception ex）{
 System.out.println（无法解析JSON，因为：+ ex）; 
} else {
 System.out.println（服务器响应状态码：
 + statusLine.getStatusCode（））; 
 
} catch（Exception ex）{
 System.out 
 .println（无法发送HTTP POST请求，原因是：+ ex）; 
} 
  

发布课程 $ b

  public class Post {
 public String timeZoneId; 
 public Post（）{
 
} 
} 
  

<

解决方案

您在评论中声明返回的JSON是这样的：

  {
dstOffset：3600，
rawOffset：36000，
status：OK ，
timeZoneId：澳大利亚/霍巴特，
timeZoneName：澳大利亚东部夏令时
} 
  

你告诉Gson你有一个 Post 对象的数组：

 列表< Post> postsList = Arrays.asList（gson.fromJson（reader，
 Post []。class））; 
  

你没有。 JSON恰好代表一个 Post 对象，而Gson告诉你。

将您的代码更改为：

  Post post = gson。来自Json（读者，Post.class）; 
  

I'm getting below error.

Failed to parse JSON due to: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

Server Url

public static final String SERVER_URL = "https://maps.googleapis.com/maps/api/timezone/json?location=-37.8136,144.9631&timestamp=1389162695&sensor=false";

Perform the request

    try {
        // Create an HTTP client
        HttpClient client = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost(SERVER_URL);

        // Perform the request and check the status code
        HttpResponse response = client.execute(post);
        StatusLine statusLine = response.getStatusLine();
        if (statusLine.getStatusCode() == 200) {
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();

            try {
                // Read the server response and attempt to parse it as JSON
                Reader reader = new InputStreamReader(content);

                GsonBuilder gsonBuilder = new GsonBuilder();
                gsonBuilder.setDateFormat("M/d/yy hh:mm a");
                Gson gson = gsonBuilder.create();
                List<Post> postsList = Arrays.asList(gson.fromJson(reader,
                        Post[].class));

                content.close();

                for (Post p : postsList) {
                    System.out.println(p.timeZoneId);
                }

            } catch (Exception ex) {
                System.out.println("Failed to parse JSON due to: " + ex);
            }
        } else {
            System.out.println("Server responded with status code: "
                    + statusLine.getStatusCode());
        }
    } catch (Exception ex) {
        System.out
                .println("Failed to send HTTP POST request due to: " + ex);
    }

Post class

public class Post {
    public String timeZoneId;
    public Post() {

    }
}

How could I solve this ?

解决方案

You state in the comments that the returned JSON is this:

{ 
  "dstOffset" : 3600, 
  "rawOffset" : 36000, 
  "status" : "OK", 
  "timeZoneId" : "Australia/Hobart", 
  "timeZoneName" : "Australian Eastern Daylight Time" 
}

You're telling Gson that you have an array of Post objects:

List<Post> postsList = Arrays.asList(gson.fromJson(reader,
                    Post[].class));

You don't. The JSON represents exactly one Post object, and Gson is telling you that.

Change your code to be:

Post post = gson.fromJson(reader, Post.class);

这篇关于预计BEGIN_ARRAY，但在第1行第2列为BEGIN_OBJECT的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！