使用 spring mvc 打印列表的内容和子列表 [英] print the contents of list along with the sublist using spring mvc

问题描述

如何将列表的内容与子列表一起打印.?有人可以帮助我如何完成服务类逻辑吗?问题在下面为网络创建一个程序，如下所示.主列表 - 类别类别子列表 - 课程

how to Print the contents of list along with the subList.? can someone help me how to complete service class logic? question was below Create a program for netplay as below. Main List - Categories Category sub list - Courses

Categories Sample Data: (Add first 3 categories from the netplay app)
 "id": 1001,
 "name": "Computing",
 "description": "network of remote servers"here

Course Sample Data:(Add first 3 courses on every category added from the netplay app)
id : 2001,
Category id: 1001,
name : "AWS"
duration : 180
miles :100

这是服务类如何实现这里的逻辑以将列表的内容与子列表一起返回

This is service class how to implement the logic here to return the content of list along with sublist

import java.util.Arrays;
import java.util.List;
import java.util.ArrayList;

import org.springframework.stereotype.Service;

@Service
public class ContentService {

 private List<Category> categories=new ArrayList<>(Arrays.asList(new Category(1001, "Computing", "network of remote servers"));

//put your code here.
public List<Category> getAllContent() {
    return categories;

}
}

推荐答案

自从你的 @RestController 它已经返回了一个 Category 的列表并且这个类别已经包含在一个列表中Course，您需要在您的服务中填写您的类别.

Since your @RestController it's already returning a list of Category and this category already has inside a list of Courses, you need fill your category with courses inside your service.

@Service
public class ContentService {
  private List<Category> categories = new ArrayList<>();

  public List<Category> getAllContent() {
    List<Course> courses = new ArrayList<>();
    courses.add(new Course(1, "Coursename", 200, 200, 1001));

    List<Category> categories = new ArrayList<>();
    categories.add(new Category(1001, "Computing", "network of remote servers", courses));
    return categories;
  }
}

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