Java Config等效于conversionService / FormattingConversionServiceFactoryBean [英] Java Config equivalent for conversionService / FormattingConversionServiceFactoryBean

问题描述

我有一个包含另一个实体的实体，如下所示：

I have an entity that contains another entity, as follows:

public class Order {

    @Id
    private int id;

    @NotNull
    private Date requestDate;

    @NotNull
    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="order_type_id")
    private OrderType orderType;
}

public class OrderType {

    @Id
    private int id;

    @NotNull
    private String name;
}

我有一个Spring MVC表单，用户可以提交新订单;他们必须填写的字段是请求日期并选择订单类型（这是一个下拉列表）。

I have a Spring MVC form where a user can submit a new order; the fields they have to fill in are the Request Date and select an Order Type (which is a drop-down).

我使用Spring Validation来验证表单输入因为尝试将orderType.id转换为OrderType而失败。

I am using Spring Validation to validate the form input which fails as it is trying to convert an orderType.id to an OrderType.

我编写了一个自定义转换器，将orderType.id转换为OrderType对象：

I have written a custom converter to convert an orderType.id into an OrderType object:

public class OrderTypeConverter implements Converter<String, OrderType> {

    @Autowired
    OrderTypeService orderTypeService;

    public OrderType convert(String orderTypeId) {

        return orderTypeService.getOrderType(orderTypeId);
    }
}

我的问题是我不知道如何注册这个转换器使用Spring使用java配置。我找到的XML等价物（来自 Spring MVC中的Dropdown值绑定）是：

My problem is I don't know how to register this converter with Spring using java config. The XML equivalent I've found (from Dropdown value binding in Spring MVC) is:

<mvc:annotation-driven conversion-service="conversionService"/>

<bean id="conversionService"
    class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <property name="converters">
       <list>
          <bean class="OrderTypeConverter"/>
       </list>
    </property>
</bean>

从网上搜索我似乎无法找到相当于java的配置 - 有人可以请帮助我out？

From searching the web I can't seem to find a java config equivalent - can someone please help me out?

UPDATE

我已将OrderTypeConvertor添加到WebMvcConfigurerAdapter，如下所示：

I have added the OrderTypeConvertor to the WebMvcConfigurerAdapter as follows:

public class MvcConfig extends WebMvcConfigurerAdapter{

    ...

    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new OrderTypeConvertor());
    }
}

但是我在OrderTypeConvertor中得到一个空指针异常，因为orderTypeService是null，大概是因为它是自动装配的，我使用了上面的新关键字。一些进一步的帮助将不胜感激。

However I get a null pointer exception in OrderTypeConvertor as orderTypeService is null, presumably because it is autowired and I've used the new keyword above. Some further help would be appreciated.

推荐答案

您需要做的就是：

@Configuration
public class MvcConfig extends WebMvcConfigurerAdapter{

    @Autowired
    private OrderTypeConvertor orderTypeConvertor;

    ...

    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(orderTypeConvertor);
    }
}

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