@RESTController和@GetMapping不返回简单Hello World列表中的JSON数组

Question

我正在使用Spring boot试图通过@RESTController和@GetMapping获得JSON响应，但是本地主机上的JSON并不支持它。这是我的密码。有人能修好这个吗？

@SpringBootApplication
@RestController
public class DemoApplication {
    public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
}
    @GetMapping
public List<Employee> hello () {
    return List.of(
            new Employee(
                    1L,
                    "Pedro",
                    "[e-mail]",
                    LocalDate.of(1989, Month.JUNE, 21),
                    32
            )
    );

}

}

下面是我创建的带有setter和getter的“employee”类。

package com.example.employee;

import java.time.LocalDate;

public class Employee {
private Long id;
private String name;
private String email;
private LocalDate dob;
private Integer age;

public Employee() {
}

public Employee(Long id,
                String name,
                String email,
                LocalDate dob,
                Integer age) {
    this.id = id;
    this.name = name;
    this.email = email;
    this.dob = dob;
    this.age = age;
}

public Employee(String name,
                String email,
                LocalDate dob,
                Integer age) {
    this.name = name;
    this.email = email;
    this.dob = dob;
    this.age = age;
}

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public LocalDate getDob() {
    return dob;
}

public void setDob(LocalDate dob) {
    this.dob = dob;
}

public Integer getAge() {
    return age;
}

public void setAge(Integer age) {
    this.age = age;
}

@Override
public String toString() {
    return "Employee{" +
            "id=" + id +
            ", name='" + name + '\'' +
            ", email='" + email + '\'' +
            ", dob=" + dob +
            ", age=" + age +
            '}';
}
}

上课到此结束。我不能正确地将代码返回到JSON，我不知道为什么。有人能解释一下吗？

Answer 1

编辑：它返回一个JSON。检查浏览器或rest客户端是否配置正确。

前面的回答：请参考以下内容：正如您已经用@RESTController注释的那样，不需要执行显式的json转换。由于您不返回POJO，并且根据您发布的代码，您没有任何getters，因此将其更改为以下内容即可完成工作：

@RequestMapping(value = "hello_world", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
        public List<StringResponse> hello() {
            return List.of(new StringResponse("Hello"),new StringResponse("World"));
        }
    
    }
    
    class StringResponse {
        private String response;
    
        public StringResponse(String s) {
            this.response = s;
        }
    
        public String getResponse() {
            return response;
        }
    
        public void setResponse(String response) {
            this.response = response;
        }
    }

或者使用像GSON这样的库：在Spring Web API中有一种干净的方法将字符串作为json返回？

  @RequestMapping(value = "hello_world", method = RequestMethod.GET,   produces = MediaType.APPLICATION_JSON_VALUE)
    public List<String> hello() {

        Gson gson = new GsonBuilder().create();
        Type type = new TypeToken<List<String>>() {}.getType();
        String json =  "[ \"Hello\", \"World\"]";
        List<String> responseList = gson.fromJson(json, type);
        
        return responseList;
    }