java - 微服务开发中spring boot应用返回对象列表出错

Question

• 我按照 youtube 上的微服务教程创建了独立服务(Spring Boot 应用程序)
• 我创建了一个服务实现 java 文件，为读取操作的请求映射 URL (/catalog/userId) 提供方法定义
• 对于上述请求的 URL，返回对象列表作为 HTTP 读取请求的响应正文(HTTP 响应)
• 在java中，发送对象列表的函数定义发生错误
• 错误发生在 MovieCatalogResource.java 的第 17 行，指出表达式的开始非法，意外的标记
• 我研究了这个错误，但仍然对执行感到震惊
• 请问你们能否通过您的建议帮助解决问题
• 提供以下代码

CatalogItem.java

package com.example.moviecatalogservice;

public class CatalogItem {
    private String name;
    private String desc;
    private int rating;
    public CatalogItem(String name, String desc, int rating){
        this.name = name;
        this.desc = desc;
        this.rating = rating;
    }
    public int getRating(){
        return rating;
    }
    public void setRating(){
        this.rating = rating;
    }
    public String getName(){
        return name;
    }
    public void setName(){
        this.name = name;
    }
    public String getDesc(){
        return desc;
    }
    public void setDesc(){
        this.desc = desc;
    }
}

MovieCatalogService.java

package com.example.moviecatalogservice;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.an notation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Collections;
import java.util.List;

@RestController
@RequestMapping("/catalog")
public class MovieCatalogResource {
    @RequestMapping("/{userId}")
    //public List<CatalogItem> getCatalog(@PathVariable("userId") String userId){
    public List<CatalogItem> getCatalog(@PathVariable("userId") String userId){
        return Collections.singletonList(
                new CatalogItem(name: "transformers", desc:"Test", rating:4)
        );
    }

}

Answer 1

改变

new CatalogItem(name: "transformers", desc:"Test", rating:4)

至

new CatalogItem("transformers", "Test", 4)

You must have a matching CatalogItem() constructor in CatalogItem Entity Or Model

在 MovieCatalogResource.java 的第 17 行进行更改后，它将如下所示

@RestController
@RequestMapping("/catalog")
public class MovieCatalogResource {
    @RequestMapping("/{userId}")
    //public List<CatalogItem> getCatalog(@PathVariable("userId") String userId){
    public List<CatalogItem> getCatalog(@PathVariable("userId") String userId){
        return Collections.singletonList(
                new CatalogItem("transformers", "Test", 4)
        );
    }

}

<小时/>

工作示例

Controller.java

@GetMapping("/{id}")
    public List<User> getUser(@PathVariable(name="id") int id)
    {
        return Collections.singletonList(
                new User(1,"username")
        );
    }

User.java

public class User {

    private int id;
    private String name;
    public User(int id, String name) {
        super();
        this.id = id;
        this.name = name;
    }
    public User() {
        super();
        // TODO Auto-generated constructor stub
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + "]";
    }


}

使用 Postman 进行测试