使用gson错误转换json预期的BEGIN_OBJECT，但是BEGIN_ARRAY在第1行第2列路径$ [英] converting json with gson error Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

问题描述

[{"user_id":"5633795","username":"_Vorago_","count300":"203483","count100":"16021","count50":"1517","playcount":"1634","ranked_score":"179618425","total_score":"1394180836","pp_rank":"34054","level":"59.6052","pp_raw":"1723.43","accuracy":"96.77945709228516","count_rank_ss":"1","count_rank_s":"19","count_rank_a":"17","country":"US","events":[]}]

我试图用GSON转换上面的JSON，但遇到错误。

I'm trying to convert the JSON above with GSON but am running into errors.

package com.grapefruitcode.osu;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

import com.google.gson.Gson;

public class Main {

static String ApiKey = "";
public static void main(String[]Args) throws Exception{
    String json = readUrl("");
    System.out.println(json);
    Gson gson = new Gson();
    User user = gson.fromJson(json, User.class);
    System.out.println();
}

private static String readUrl(String urlString) throws Exception {
    BufferedReader reader = null;
    try {
        URL url = new URL(urlString);
        reader = new BufferedReader(new InputStreamReader(url.openStream()));
        StringBuffer buffer = new StringBuffer();
        int read;
        char[] chars = new char[1024];
        while ((read = reader.read(chars)) != -1)
            buffer.append(chars, 0, read); 

        return buffer.toString();
    } finally {
        if (reader != null)
            reader.close();
    }
}

}

该网址和api键都是空白的，出于安全原因，当我运行代码并将json正确转换为字符串时，变量被填充。我已经测试过了。如果有人能告诉我是什么原因导致了错误，那将是美好的。

The url and api key are left blank for security reasons, the variables are filled when I run the code and the json is converted to a string properly. I've tested it already. If somebody could tell me what is causing the error that would be wonderful.

package com.grapefruitcode.osu;

public class User {
 String user_id = "";
 String username = "";
 String count300 = "";
 String count100= "";
}

推荐答案

在JSON中

• [...] 表示数组
  
• {...} 表示对象，
  

• [ ... ] represents array
• { ... } represents object,

so [{...}] 是包含一个对象的数组。尝试使用

so [ {...} ] is array containing one object. Try using

Gson gson = new Gson();
User[] users = gson.fromJson(json, User[].class);
System.out.println(Arrays.toString(users));
//or since we know which object from array we want to print
System.out.println(users[0]);

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