java - 如何对Java对象进行正确的Json反序列化？

Question

我真的需要帮助，我正在反序列化下一个 json:

{
    "name":"myname",
    "userID":"12345",
    "password":"sha1passwordASDESFSGSD",
    "active":"1",
    "profile":"2",
    "job":"Manager"
}

我使用 Jersey 来创建 webService，当我接收 json 时，我将它作为输入流接收

我也尝试过使用字符串

@POST
@Path("user/in/")
@Produces("application/json")
public String InsertUser(InputStream inStr) 
{
    String line = null, res = "POST 200 > ";
    BufferedReader br = new BufferedReader(new InputStreamReader(inStr));
    try {
        while ((line = br.readLine()) != null) {
            System.out.println(line);
            res += line;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        UserInformation user = new Gson().fromJson(res, UserInformation.class);
        System.out.println("All done");
        System.out.println(user.getName());

    } catch (Exception e) {
        System.out.println("Error al convertir jo object " + e.getCause() + e.getMessage());
    }

    return "POST 200 > ";
}

我尝试使用InputStreamReader:

@POST
@Path("user/in/")
@Produces("application/json")
public String InsertUser(InputStream inStr)
{
    try {
        InputStreamReader isr = new InputStreamReader(inStr);
        UserInformation user = new Gson().fromJson(isr, UserInformation.class);
        System.out.println("All done");

        System.out.println(user.getName());

    } catch (Exception e) {
        System.out.println("Error al convertir jo object " + e.getCause() + e.getMessage());
    }

    return "POST 200 > ";
}

这些代码都不起作用。他们不会抛出异常或打印“全部完成”。
当我调试对象时，user 不会出现在变量菜单中。
根据我的经验，是因为 UserInformation user = new Gson().fromJson(isr, UserInformation.class);

行中发生错误

但我看不出是哪一个。

我的 UserInformation 类是下一个

public class UserInformation {

    private String name;
    private String userID;
    private String password;
    private String active;
    private String profile;
    private String job;

    // Methods removed for brevity
}

Answer 1

我假设您正在使用 Google gson。这是我的回答:

    @Post
    @Path("user/in")
    @Produces(MediaType.APPLICATION_JSON)
    public Response InsertUser(string json){
      JsonElement jsonElement = new JsonParser().parse(json);
      JsonObject object = jsonElement.getAsJsonObject();
      String name = object.getAsJsonPrimitive("name").getAsString();
      int userID = object.getAsJsonPrimitve("userID").getAsInt();
      String password = object.getAsJsonPrimitive("password").getAsString();
      String job = object.getAsJsonPrimitive("job").getAsString();
      int active = object.getAsJsonPrimitve("active").getAsInt();
      int profile = object.getAsJsonPrimitve("profile").getAsInt();



      return Response.status(Response.Status.OK).entity("all done").build();


    }