对象映射器值返回 Null

Question

我正在使用 Ajax Post 请求，使用 jQuery 将数据发送到 Spring MVC。其中两个值是 String 数据类型，而另外两个是 int。我收到以下错误：Can not instantiate variable of type.....From Integral number...

我正在接收从客户端发送到服务器端 Java 代码的数据，但是对象映射器的值为空（即 personid = om.readValue(id, MyClass.class);）并且那些相同的行是错误指向的地方。将 Map<String,String> 更改为 Map<String, Object> 也不行。

下面是我的代码。任何帮助将不胜感激。

JSON:

{
  id:"35",
  firstname : "John",
  lastname : "Doe",
  age: "40"

}

控制器：

@RequestMapping(value="/mywebservice", method = RequestMethod.POST)
public Object getPerson(@RequestBody Map<String, String> mydata){

 MyClass personid = null;
 MyClass fname = null;
 MyClass lname = null;
 MyClass personage = null;

 String id = "";
 String firstname = "";
 String lastname = "";
 String age = "";
 ObjectMapper om = new ObjectMapper();

 if(mydata.containsKey("id"){
  id = mydata.get("id");
}
if(mydata.containsKey("firstname"){
  firstname = mydata.get("firstname");
}

if(mydata.containsKey("lastname"){
  lastname = mydata.get("lastname");
}

if(mydata.containsKey("age"){
  age = mydata.get("age");
}

try{
 personid = om.readValue(id, MyClass.class);
 fname = om.readValue(firstname, MyClass.class);
 lname = om.readValue(lastname, MyClass.class);
 personage = om.readValue(age, MyClass.class);
}catch(Exception e){ ...}

  return helperClass(personid, fname, lname, personage);

}

帮手Class:

public Object getFirstName(MyClass personid, MyClass fname, MyClass lname, MyClass personage){

  return addName(personid, fname, lname, personage);

}

型号：

 @JsonProperty("id")
    private int childid;

@JsonProperty("firstname")
private String firstname;

@JsonProperty("lastname")
private String lastname;

@JsonProperty("age")
private int childage;

Answer 1

尝试更改 json?

{ 
  id:35,
  firstname : "John",
  lastname : "Doe", 
  age: 40

}

对象映射器值返回 Null

Object Mapper Values Returning Null

java

spring

objectmapper