spring中如何将uri字符串转换为复杂对象类型

Question

我只是想知道，我可以将 uri 字符串转换为另一种对象类型吗？

    @RequestMapping(value="/key/{keyDomain}", method=RequestMethod.GET)
    public String propertyEditor(@PathVariable(value="keyDomain") KeyDomain key, Model model){
        model.addAttribute("key", key);
        return "propertyEditor";
    }

这里是我的配置

<beans:bean id="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer">
        <beans:property name="customEditors">
            <beans:map>
                <!-- <beans:entry key="com.template.baseline.domain.KeyDomain" value="com.template.baseline.propertyEditor.KeyPropertyEditor"/>  -->
                <beans:entry key="com.template.baseline.domain.KeyDomain">
                    <beans:ref bean="keyDomainPropertyEditor"  />
                </beans:entry>
            </beans:map>
        </beans:property>
    </beans:bean>

<!-- key domain property editor bean -->
<beans:bean id="keyDomainPropertyEditor"  class="com.template.baseline.propertyEditor.KeyPropertyEditor">
    <beans:property name="keyDomain">
        <beans:bean class="com.template.baseline.domain.KeyDomain" />
    </beans:property>   
</beans:bean>

和 propertyEditor 类：

public class KeyPropertyEditor extends PropertyEditorSupport{

    private KeyDomain keyDomain;

    /**
     * example : 10435
     * - 10 will be keyId
     * - 435 will be baseOfficeId
     */
    @Override
    public void setAsText(String text) throws IllegalArgumentException{
        KeyDomain keyDomain = new KeyDomain();
        keyDomain.setKeyId(Integer.parseInt(text.substring(0,1)));
        keyDomain.setBaseOfficeId(Integer.parseInt(text.substring(2,4)));       
        setValue(keyDomain);
    }

    @Override
    public String getAsText() {
        KeyDomain value = (KeyDomain) getValue();
        return (value != null ? value.toString() : "");
    }

    public void setKeyDomain(KeyDomain keyDomain) {
        this.keyDomain = keyDomain;
    }   
}

我认为我可以使用属性编辑器将我的 URI 字符串转换为适当的对象类型。我已经实现并配置了 CustomEditorConfigurer，但我总是得到 ConversionNotSupportedException。

如果我在控制器中添加 initBinder，一切都会很好：

@InitBinder
public void setBinder(WebDataBinder dataBinder) {
    dataBinder.registerCustomEditor(KeyDomain.class, new KeyPropertyEditor());      
}

并且我收到类似这样的警告

警告：org.springframework.beans.factory.config.CustomEditorConfigurer - 不推荐将 PropertyEditor 实例传递到 CustomEditorConfigurer 中：改用 PropertyEditorRegistrars 或 PropertyEditor 类名。违规密钥 [com.template.baseline.domain.KeyDomain;有问题的编辑器实例：com.template.baseline.propertyEditor.KeyPropertyEditor@1a271f5

感谢您的回答。

ps：webBindingInitalizer 注入 AnnotationMethodHandlerAdapter

<beans:bean id="AnnotationMethodHandlerAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <beans:property name="webBindingInitializer">
        <beans:bean class="com.template.baseline.initialize.CustomWebBindingInitializer" />
    </beans:property>
</beans:bean>

和实现

public class CustomWebBindingInitializer implements WebBindingInitializer  {

public CustomWebBindingInitializer(){
    System.out.println("******** constructor *********");
}

public void initBinder(WebDataBinder binder, WebRequest request) {
    System.out.println("******** initBinder *********");
    binder.registerCustomEditor(KeyDomain.class, new KeyDomainPropertyEditor());
}

}

Answer 1

CustomEditorConfigurer 与 Web 请求数据绑定无关。

如果你想全局注册你的PropertyEditor，你需要实现WebBindingInitializer 并提供 AnnotationMethodHandlerAdapter 与它：

<bean 
    class = "org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <proeprty name = "webBindingInitializer">
        <bean class = "MyWebBindingInitializer" />
    </property>
</bean>

另一个选择是实现您的转换逻辑为 Formatter 并通过 FormattingConversionServiceFactoryBean 和 配置它，参见 mvc-showcase 示例。