java - 不支持 Spring + Jackson 内容类型 'application/json;charset=UTF-8'

Question

当使用 jQuery ajax 发布时，出现以下错误。

org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:226)
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:148)
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:125)

有趣的是当我调试

RequestResponseBodyMethodProcessor.java:148

并获取 webRequest.getHeader("Content-Type") 值为 application/json。这很正常。

但是到了链的最后一个方法时AbstractMessageConverterMethodArgumentResolver.java:226 Content-Type变成了application/json； charset=utf-8;

抛出异常。这是我的代码；

Controller

@RequestMapping(value="/user/set-preference",method=RequestMethod.POST)
@ResponseBody
private boolean set_preference(@RequestBody UserPreference preference)
{

    try{            
        userService.save(preference);

        return true;
    }catch(Exception ex){
        return false;
    }
}

实体

@Entity
public class UserPreference extends BaseEntity{

@ManyToOne(fetch=FetchType.LAZY)
private User user;

private String name;
private String information;

public User getUser() {
    return user;
}
public void setUser(User user) {
    this.user = user;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getInformation() {
    return information;
}
public void setInformation(String information) {
    this.information = information;
}


}

Spring MVC 配置

<mvc:annotation-driven>
        <mvc:message-converters>
        <bean
            class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper">
                <bean
                    class="com.test.HibernateAwareObjectMapper" />
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

Answer 1

我遇到了同样的问题，我通过向我的类添加默认构造函数解决了这个问题。试试吧。