Question

我试图将对象从客户端发送到服务器。下面是使用spring mvc的控制器。

@Controller
public class HomeController {

public class User{
        public String name;
        public String email;



        public User() {
            super();
        }
        public User(String name, String email) {
            super();
            this.name = name;
            this.email = email;
        }
        public String getName() {
            return name;
        }
        public String getEmail() {
            return email;
        }
        public void setName(String name) {
            this.name = name;
        }
        public void setEmail(String email) {
            this.email = email;
        }



    }

    @RequestMapping(value="/getUsers", method= RequestMethod.POST)
    public @ResponseBody User getUser(User user){
        return user;
    }}

在客户端，我在这样的帖子中发送对象 http://localhost:2015/spring/getUsers

POST /spring/getUsers HTTP/1.1
Host: localhost:2015
Cache-Control: no-cache

{"name":"vinod", "email":"vinod@gmaol.com" }

但我在服务器端遇到这样的错误

HTTP Status 500 - Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.vinod.spring.HomeController$User]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.vinod.spring.HomeController$User.<init>()

Answer 1

尝试将User类重构为另一个文件，并使用@Resource注释将其引用到控制器中。也许抛出了异常，因为User类是嵌套的。

实施例： User.java

@Component
public class User{
    public String name;
    public String email;



    public User() {
        super();
    }
    public User(String name, String email) {
        super();
        this.name = name;
        this.email = email;
    }
    public String getName() {
        return name;
    }
    public String getEmail() {
        return email;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setEmail(String email) {
        this.email = email;
    }



}

HomeController.java

@Controller
public class HomeController {

    @Resource
    User user;

    @RequestMapping(value="/getUsers", method= RequestMethod.POST)
    public @ResponseBody User getUser(User user){
        return user;
    }
}

请求处理失败;嵌套异常是org.springframework.beans.BeanInstantiationException

1 个答案: