使用邮递员解析和映射 json

Question

@Controllerpublic class StudentRegistrationController {@RequestMapping(method = RequestMethod.POST, value="/register/reg")@ResponseBodyStudentRegistrationReply 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;}}试图将邮递员请求映射到但为空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. 您的请求正文存在问题，您应该将 json 中的密钥作为 java 变量名传递，您正在传递Student_payment_details而不是payment_detailsList

3. Getters 和 Setters 应该与你的变量名有关。

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

}

下图显示了控制器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 中主要使用的是camelCase.

变量的命名也应该与类类型相似，

这里变量 payment_detailsList 的类型Student_payment_details会导致混淆，如果您希望 JSON 变量名称不同，则可以使用 as

 @JsonProperty("payment_detailsList")

 private Student_payment_details student_payment_details;