Spring mvc bad request with @requestbody

问题:

i have a Spring MVC service with that signature:

@RequestMapping(method = RequestMethod.POST, value = "/addUser", consumes = "application/json")
    public @ResponseBody User addUser(@RequestBody User user) {

And this in context.xml

<bean id="jacksonMessageConverter"
        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="jacksonMessageConverter" />
            </list>
        </property>
    </bean>

I do a Post request and always return me a 400error->Bad request. I write a filter to read the request content and is this:

Edit json:

{
    "email": "Anchor",
    "latitude": 40.3139461,
    "longitude": -3.8810229,
    "name": "a",
    "online": true,
    "password": "a",
    "deviceRegId": "APA91bGnD1EuqEm9cpoHsenC-HEphQJRniEnhPovK24QkKkLBXrDesSCP6CFlyOKwR1huwSI28Wd-DdN0N8MDKle7myYB7Dznzc3Z11ZOv3jMlJEIegykpnnnYScrElw2czQEa4pKFeQW7BklUsUS-IB15LMqH_Ag"
}

Edit: The user class

public class User implements Serializable{


@JsonProperty("deviceRegId")
private java.lang.String deviceRegistrationID;
@JsonProperty("email")
private java.lang.String email;
@JsonProperty("latitude")
private java.lang.Double latitude;
@JsonProperty("longitude")
private java.lang.Double longitude;
@JsonProperty("name")
private java.lang.String name;
@JsonProperty("online")
private java.lang.Boolean online;
@JsonProperty("password")
private java.lang.String password;

public User(String deviceRegid) {
    this.deviceRegistrationID = deviceRegid;
    this.online = true;
}

public java.lang.String getDeviceRegistrationID() {
    return deviceRegistrationID;
}

public java.lang.String getEmail() {
    return email;
}

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

public java.lang.Double getLatitude() {
    return latitude;
}

public void setLatitude(java.lang.Double latitude) {
    this.latitude = latitude;
}

public java.lang.Double getLongitude() {
    return longitude;
}

public void setLongitude(java.lang.Double longitude) {
    this.longitude = longitude;
}

public java.lang.String getName() {
    return name;
}

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

public java.lang.Boolean getOnline() {
    return online;
}

public void setOnline(java.lang.Boolean online) {
    this.online = online;
}

/**
 * @return value or {@code null} for none
 */
public java.lang.String getPassword() {
    return password;
}

/**
 * @param password
 *            password or {@code null} for none
 */
public void setPassword(java.lang.String password) {
    this.password = password;
}

Whats the problem?

回答1:

Please remove the parametrized constructor and there you go. :)

public User(String deviceRegid) {
  this.deviceRegistrationID = deviceRegid;
  this.online = true;
}

Because at databinding default constructor is called.

Check your json data:

{
  "email": "Anchor",
  "latitude": 40.3139461,
  "longitude": -3.8810229,
  "name": "a",
  "online": true,
  "password": "a",
   "deviceRegId": "APA91bGnD1EuqEm9cpoHsenC-HEphQJRniEnhPovK24QkKkLBXrDesSCP6CFlyOKwR1huwSI28Wd-DdN0N8MDKle7myYB7Dznzc3Z11ZOv3jMlJEIegykpnnnYScrElw2czQEa4pKFeQW7BklUsUS-IB15LMqH_Ag"
}

Verify the following things:

1. Whether the name of JSON matches the User class's field name.

2. Also check whether JSON value is supported by the corresponding field name datatype in User class.

   Do try it, I have faced the same issue numerous times.

回答2:

I was going to guess the problem is with consumes = "application/json", and maybe it is... but I did a quick test adding that restriction to my environment (which is not specifying that it is sending "application/json"),

and instead I got a "415 Unsupported media Type".

Still, I recommend removing that and see if it helps.

回答3:

I had a bad request too. And sometimes bad syntax etc. But I fixed it with another Jackson Dependancy:

Instead of Codehause Jackson, I use now fasterxml:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.3.3</version>
</dependency>