java - 使用 postman 解析和映射 json

Question

@Controller
public class StudentRegistrationController {

@RequestMapping(method = RequestMethod.POST, value="/register/reg")
@ResponseBody
StudentRegistrationReply registerStudent(@RequestBody Student student) {
    System.out.println("In registerStudent");
    StudentRegistrationReply stdregreply = new StudentRegistrationReply();           

    StudentRegistration.getInstance().add(student);

    //We are setting the below value just to reply a message back to the caller
    stdregreply.setId(student.getId());
    stdregreply.setName(student.getName());
    stdregreply.setAge(student.getAge());
    stdregreply.setRegistrationNumber(student.getRegistrationNumber());
    stdregreply.setPayment_detailsList(student.getPayment_detailsList());
    stdregreply.setRegistrationStatus("Successful");

    daocontroller.setStudentRegistration(stdregreply);
    return stdregreply;

}

}

尝试将 postman 请求映射到但得到空

json 就像

{ 
    "id": 300,
    "name": "kukri",
    "age": 26,
    "registrationNumber": "54326",
    "Student_payment_details":
    {
      "pay": 50000,
      "date": "23061994",
      "phcounter": "SKB"
    }

}

Java 类

public class Student {
    private int id;
    private String name;
    private int age;
    private String registrationNumber;
    private Student_payment_details payment_detailsList; //getter and setter
}

Answer 1

1. 使用 Lombok 作为我的 getter/setter，您可以忽略它并编写自己的 getter/setter
2. 您的请求正文有问题，您应该将 json 中的 key 作为 java 变量名称传递，您传递的是 Student_ payment_details 而不是 payment_detailsList
3. Getter 和 Setter 应该与您的变量名称相关。

请求网址:

curl -X POST \
  http://localhost:8080/register/reg \
  -H 'Content-Type: application/json' \
  -H 'cache-control: no-cache' \
  -d '{
  "id": 300,
  "name": "kukri",
  "age": 26,
  "registrationNumber": "54326",
  "payment_detailsList": {
    "pay": 50000,
    "date": "23061994",
    "phcounter": "SKB"
  }
}'

Java Dtos:

import lombok.Data;

@Data
public class Student_payment_details {
    int pay;
    String date;
    String phcounter;
}

import lombok.Data;

@Data
public class Student {
    private int id;
    private String name;
    private int age;
    private String registrationNumber;
    private Student_payment_details payment_detailsList; //getter and setter
}

下图显示了 Controller 内填充的学生变量的内容

注意:我不知道您的用例，但作为一般建议，请遵循 1 种命名约定:snake_case 或 camelCase。
在java中最常用的是camelCase。
另外变量的命名应该与类类型类似，
这里变量 payment_detailsList 的类型是 Student_ payment_details ，这会导致困惑，如果你希望 JSON 变量名称不同，那么你可以使用 as

 @JsonProperty("payment_detailsList")
 private Student_payment_details student_payment_details;