Question

我在解析java中的json数组时遇到了麻烦。

我有一个JSON数组，如下所示从服务器返回

   [
{
    "User": "538000001",
    "Transaction-Id": "oHbgP2y2OXfdDcxAOI/q9HxY68PNs+xS+8CvfGpoN2ZUU/8mavBaI0564VeZXYBDMnk84kkfZeCJM51I92rFdf4Zi4uKEoqJd7jr78bXo4MOyoSs5mntIir7aVJ9/b+4nz6x2+g0LPY7+Sq8RHvbr+c4Evhg+VXeKDzE3f6+bJo=,YWFhd3MxLnJlYWxtMTsxNDE4MDczNTk0MjkxOzUyQDUzODAwMDAwMQ==",
    "Challenge-Response": "7ZGlkpVfYvQDjvTa2EShZwZ3dGc=",
    "Challenge": "MzcrMzM3NzA4MTM3KzE0MTgwNzM1OTQ="
},
{
    "User": "538000000",
    "Transaction-Id": "+5Oi4NnG9HOVMPx4nM/TP4ZBONG4HtOBbA5+uf/d+hik7o1Aes9H0PLCqAgG/Td2xLDPOdZJJW7ppj3MLkZBvJr+t9JWKdSGpGHAYTp0oonRTVsesPVCtNI6dXvMY9P+bHDiBWkZiqjSjOZuuzImLaJ17G1/D/GNqIonaNCjqjo=,YWFhd3MxLnJlYWxtMTsxNDE4MDczNTk0Mjk1OzUzQDUzODAwMDAwMA==",
    "Challenge-Response": "eEzLzYLmzo5R2tNwokG0mfbuLZY=",
    "Challenge": "MzgrNDY2NjY4NjgyKzE0MTgwNzM1OTQ="
}
]

我使用GSON来解析这个数组，但到目前为止还不成功。我写了下面的代码

     class round1Body
     {
         String User;
         String Transaction_Id;
         String Challenge_Response;
         String Challenge;

         round1Body(String User,String Transaction_Id,String Challenge_Response,String Challenge)
         {
            this.User = User;
            this.Transaction_Id=Transaction_Id;
            this.Challenge_Response = Challenge_Response;
            this.Challenge=Challenge;
         }
         @Override
         public String toString()
        {
            return "User = " + User + " Transaction-Id = " + Transaction_Id + " Challenge-Response = " + Challenge_Response + "Challenge = "
                    + Challenge;
        }
     }
  Type listType = new TypeToken<ArrayList<round1Body>>(){}.getType();
  Object jsonE = new Gson().fromJson(firstResponse.readEntity(String.class),listType);
  System.out.println(jsonE);

我尝试打印时的输出是[null，null]。

有人可以帮帮我吗？

提前致谢！

Answer 1

您似乎对firstResponse.readEntity(String.class)电话有疑问。否则你不会有[null, null]作为输出。所以问题首先来自这里。试着让它发挥作用。

然后，如果你没有在你的课程中指定SerializedName规则＆＃39;字段，GSON要求名称必须与JSON文件中的密钥名称完全匹配。

您在JSON端有"Transaction-Id"但在Java文件中将其定义为Transaction_Id，Challenge_Response也是如此。

由于在Java中标识符不能有-，因此您需要为这两个属性指定规则。

class round1Body {
    String User;
    @SerializedName("Transaction-Id")
    String Transaction_Id;
    @SerializedName("Challenge-Response")
    String Challenge_Response;
    String Challenge;
    //...
}

通过这些更改，它成功打印（我正在从文件中读取您的JSON字符串）：

[User = 538000001 Transaction-Id = oHbgP2y2OXfdDcxAOI/q9HxY68PNs+xS+8CvfGpoN2ZUU/8mavBaI0564VeZXYBDMnk84kkfZeCJM51I92rFdf4Zi4uKEoqJd7jr78bXo4MOyoSs5mntIir7aVJ9/b+4nz6x2+g0LPY7+Sq8RHvbr+c4Evhg+VXeKDzE3f6+bJo=,YWFhd3MxLnJlYWxtMTsxNDE4MDczNTk0MjkxOzUyQDUzODAwMDAwMQ== Challenge-Response = 7ZGlkpVfYvQDjvTa2EShZwZ3dGc=Challenge = MzcrMzM3NzA4MTM3KzE0MTgwNzM1OTQ=, User = 538000000 Transaction-Id = +5Oi4NnG9HOVMPx4nM/TP4ZBONG4HtOBbA5+uf/d+hik7o1Aes9H0PLCqAgG/Td2xLDPOdZJJW7ppj3MLkZBvJr+t9JWKdSGpGHAYTp0oonRTVsesPVCtNI6dXvMY9P+bHDiBWkZiqjSjOZuuzImLaJ17G1/D/GNqIonaNCjqjo=,YWFhd3MxLnJlYWxtMTsxNDE4MDczNTk0Mjk1OzUzQDUzODAwMDAwMA== Challenge-Response = eEzLzYLmzo5R2tNwokG0mfbuLZY=Challenge = MzgrNDY2NjY4NjgyKzE0MTgwNzM1OTQ=]

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用Java解析JSON数组

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