Java 手动创建 Json 字符串
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Create Json String manually
提问by user1145874
I'm trying to create a Json structure manually in Java. In the end, I need the a string representation of my Json object. Since my project already has a dependency to GSON, I wanted to use this. But after several hours of trying and googling, I think, I completely misunderstand something.
我正在尝试在 Java 中手动创建一个 Json 结构。最后，我需要 Json 对象的字符串表示。由于我的项目已经依赖于 GSON，我想使用它。但是经过几个小时的尝试和谷歌搜索，我想，我完全误解了一些东西。
At the moment, I have the following (non-working) code:
目前，我有以下（非工作）代码：
JsonObject user_auth = new JsonObject();
user_auth.addProperty("user_name", username);
user_auth.addProperty("password", password);
JsonObject rest_data = new JsonObject();
Gson gson = new Gson();
rest_data.addProperty("user_auth", gson.toJson(user_auth));
rest_data.addProperty("application", APPLICATION_NAME);
String payload = gson.toJson(rest_data);
The problem I'm facing is that the "user_auth" element gets escaped quotes (\" instead of " when it is added to the outer element. How can I prevent this? I also tried to use
我面临的问题是“user_auth”元素被转义引号（\”而不是“当它添加到外部元素时。我怎样才能防止这种情况？我也尝试使用
rest_data.addProperty("user_auth", user_auth.toString());
but this did exactely the same.
但这完全一样。
Regards,
问候，
回答by fluminis
Writing the JSON manually is not a good solution.
手动编写 JSON 不是一个好的解决方案。
It seems that you encode user_auth twice.
您似乎对 user_auth 进行了两次编码。
Try this instead:
试试这个：
JsonObject user_auth = new JsonObject();
user_auth.addProperty("user_name", username);
user_auth.addProperty("password", password);
JsonObject rest_data = new JsonObject();
rest_data.addProperty("user_auth", user_auth);
rest_data.addProperty("application", APPLICATION_NAME);
Gson gson = new Gson();
String payload = gson.toJson(rest_data);
回答by Arun
If you dont wont to add external jar then, try this
如果你不想添加外部罐子，试试这个
return "{UPLOAD:"+upload+",UPLOADSTATUS:"+perUpload+",TRANSCODE:"+transcode+",TRANSCODESTATUS:"+transcodestatus+"}";
return "{UPLOAD:"+upload+",UPLOADSTATUS:"+perUpload+",TRANSCODE:"+transcode+",TRANSCODESTATUS:"+transcodestatus+"}";
回答by Andres Leon Rangel
Use the addProperty() for the user_auth and then for the rest_data you need the payload.
对 user_auth 使用 addProperty()，然后对你需要有效负载的 rest_data 使用 addProperty()。
String payloadJSON = gson.toJson(rest_data);
回答by Evgeny Lebedev
Another way is directly convert POJO into JSON.
另一种方式是直接将POJO转成JSON。
1. Create POJO object
1.创建POJO对象
i.e. user class:
即用户类：
class User {
@JsonProperty("user_name") // this annotation helps you to specify
// property name in result json
private String userName;
@JsonProperty("first_name")
private String firstName;
// ...
// getters and setters here, hashcode, equals, etc.
}
2. Convert POJO to JSON string
2. POJO转JSON字符串
for example:
例如：
User user = new User("superlogin", "superpass", ...);
String jsonString = new Gson().toJson(user);
Thats all :)
就这样 ：）
I think it's more convenient way than build json structure manually.
我认为这比手动构建 json 结构更方便。
