java - Spring MVC @RequestBody 接收具有非原始属性的对象包装器

Question

我按如下方式创建 JSON:

    var manager = {
        username: "admin",
        password: "admin"
    };
    var userToSubscribe = {
        username: "newuser",
        password: "newpassword",
        email: "user@1and1.es"
    };

    var openid = "myopenid";

    var subscription = {
            manager: manager,
            userToSubscribe : userToSubscribe,
            openid : openid
    };

    $.ajax({
        url: '/myapp/rest/subscribeUser.json',
        type: 'POST',
        dataType: 'json',
        contentType: 'application/json',
        mimeType: 'application/json',
        data: JSON.stringify({subscription : subscription})   
    });

这是发送的 JSON:

{"subscription":{"manager":{"username":"admin","password":"admin"},"userToSubscribe":{"username":"newuser","password":"newpassword","email":"user@1and1.es"},"openid":"myopenid"}}  

我想将此 JSON 映射到包装器类。这是包装器:

private class Subscription{
    private User manager;
    private User userToSubscribe;
    private String openid;
    public User getManager() {
        return manager;
    }
    public void setManager(User manager) {
        this.manager = manager;
    }
    public User getUserToSubscribe() {
        return userToSubscribe;
    }
    public void setUserToSubscribe(User userToSubscribe) {
        this.userToSubscribe = userToSubscribe;
    }
    public String getOpenid() {
        return openid;
    }
    public void setOpenid(String openid) {
        this.openid = openid;
    }
}

pom.xml 中的 jackson 依赖(我使用的是 spring 3.1.0.RELEASE):

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.10</version>
    </dependency>

rest-servlet.xml中的映射

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
   <property name="messageConverters">
       <list>
           <ref bean="jsonConverter" />
       </list>
   </property>
</bean>

<bean id="jsonConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
   <property name="supportedMediaTypes" value="application/json" />
</bean>

以及 Controller 方法的头部:

public @ResponseBody SimpleMessage subscribeUser(@RequestBody Subscription subscription)

作为 POST 的结果，我收到了 400 Incorrect 请求错误。是否可以这样做，或者我需要用 @RequestBody 来做吗？字符串或 @RequestBody Map<String,Object>并自己解码 JSON？

谢谢!

Answer 1

查看您的 JSON

{
    "subscription": {
        "manager": {
            "username": "admin",
            "password": "admin"
        },
        "userToSubscribe": {
            "username": "newuser",
            "password": "newpassword",
            "email": "user@1and1.es"
        },
        "openid": "myopenid"
    }
}

根元素是 subscription，它是一个 JSON 对象。您的 Subscription 类没有 subscription 字段。所以没有任何东西可以将 subscription 元素映射到，因此它失败并显示 400 Bad Request。

创建一个类SubscriptionWrapper

public class SubscriptionWrapper {
    private Subscription subscription;

    public Subscription getSubscription() {
        return subscription;
    }

    public void setSubscription(Subscription subscription) {
        this.subscription = subscription;
    }
}

并更改您的处理程序方法以接受此类型的参数

public @ResponseBody SimpleMessage subscribeUser(@RequestBody SubscriptionWrapper subscriptionWrapper)

您可能需要在 MappingJacksonHttpMessageConverter 中配置 ObjectMapper(仅供引用，您应该使用 MappingJackso2nHttpMessageConverter)，以便忽略缺失的属性。