如何将自定义版本的WebDataBinder注入Spring 3 MVC？

Question

我写了一个WebDataBinder的自定义实现.在将来,我想对它进行增强,以便它在类本身上查找注释,并确定它是否应该绑定数据.

如何将此类注入Spring上下文而不是WebDataBinder？

我想要的是,如果我运行此代码,我的WebDataBinder版本将被注入,而不是默认的Spring.

@Controller
public class MyFormController {

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        // ...
    }

    // ...
}

我自定义的WebDataBinder实现.它允许我按类而不是方法名称排除数据绑定.

    package com.companyname.spring;

    import org.springframework.beans.MutablePropertyValues;
    import org.springframework.util.StringUtils;
    import org.springframework.web.bind.WebDataBinder;

    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.List;

    public class CustomDataBinder extends WebDataBinder {

        List<Class> disallowedClasses = new ArrayList<>();

        public CustomDataBinder(Object target) {
            super(target);
        }

        public CustomDataBinder(Object target, String objectName) {
            super(target, objectName);
        }

        public CustomDataBinder disallowClass(Class... classes) {
            Collections.addAll(disallowedClasses, classes);
            return this;
        }

        @Override
        protected void doBind(MutablePropertyValues mpvs) {
            if(disallowedClasses.contains(getTarget().getClass())) {
                if (logger.isDebugEnabled()) {
                    logger.debug("DataBinder will not bind class [" + getTarget().getClass().getSimpleName() + "] because it appears in the list of disallowed classes [" + StringUtils.collectionToCommaDelimitedString(disallowedClasses) + "]");
                }
            } else {
                super.doBind(mpvs);
            }
        }
    }

EDIT1

第一次通过,遇到AsyncSupportConfigurer问题

@Configuration
@ComponentScan(basePackageClasses = RootContextConfig.class)
@EnableTransactionManagement
@EnableWebSecurity
@EnableAsync
@EnableSpringConfigured
@EnableLoadTimeWeaving
public class RootContextConfig extends WebMvcConfigurationSupport {

    @Bean
    public RequestMappingHandlerAdapter requestMappingHandlerAdapter() {
        List<HandlerMethodArgumentResolver> argumentResolvers = new ArrayList<HandlerMethodArgumentResolver>();
        addArgumentResolvers(argumentResolvers);

        List<HandlerMethodReturnValueHandler> returnValueHandlers = new ArrayList<HandlerMethodReturnValueHandler>();
        addReturnValueHandlers(returnValueHandlers);

        RequestMappingHandlerAdapter adapter = new CustomRequestMappingHandlerAdapter();
        adapter.setContentNegotiationManager(mvcContentNegotiationManager());
        adapter.setMessageConverters(getMessageConverters());
        adapter.setWebBindingInitializer(getConfigurableWebBindingInitializer());
        adapter.setCustomArgumentResolvers(argumentResolvers);
        adapter.setCustomReturnValueHandlers(returnValueHandlers);

        AsyncSupportConfigurer configurer = new AsyncSupportConfigurer();
        configureAsyncSupport(configurer);


//All the methods called off of configurer are giving me errors because they have protected level access. I'm not really sure how they're being called in the code I copied this from.
        if (configurer.getTaskExecutor() != null) {
            adapter.setTaskExecutor(configurer.getTaskExecutor());
        }
        if (configurer.getTimeout() != null) {
            adapter.setAsyncRequestTimeout(configurer.getTimeout());
        }
        adapter.setCallableInterceptors(configurer.getCallableInterceptors());
        adapter.setDeferredResultInterceptors(configurer.getDeferredResultInterceptors());

        return adapter;
    }

自定义RequestMappingHandlerAdapter

package com.companyname.dirtylibs.spring;

import org.springframework.web.method.annotation.InitBinderDataBinderFactory;
import org.springframework.web.method.support.InvocableHandlerMethod;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.mvc.method.annotation.ServletRequestDataBinderFactory;

import java.util.List;

public class CustomRequestMappingHandlerAdapter extends RequestMappingHandlerAdapter {
    @Override
    protected InitBinderDataBinderFactory createDataBinderFactory(List<InvocableHandlerMethod> binderMethods) throws Exception {
        return new CustomInitBinderDataBinderFactory(binderMethods, getWebBindingInitializer());
    }
}

自定义InitBinderDataBinderFactory

package com.companyname.dirtylibs.spring;

import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.support.WebBindingInitializer;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.bind.support.WebRequestDataBinder;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.annotation.InitBinderDataBinderFactory;
import org.springframework.web.method.support.InvocableHandlerMethod;
import org.springframework.web.servlet.mvc.method.annotation.ServletRequestDataBinderFactory;

import java.util.List;

public class CustomInitBinderDataBinderFactory extends InitBinderDataBinderFactory {

    /**
     * Create a new instance.
     *
     * @param binderMethods {@code @InitBinder} methods, or {@code null}
     * @param initializer   for global data binder intialization
     */
    public CustomInitBinderDataBinderFactory(List<InvocableHandlerMethod> binderMethods, WebBindingInitializer initializer) {
        super(binderMethods, initializer);
    }

    @Override
    protected CustomDataBinder createBinderInstance(Object target, String objectName, NativeWebRequest webRequest) throws Exception {
        return new CustomDataBinder(target, objectName);
    }
}

Answer 1

这不是一项简单的任务.Spring可以进行大量的自定义,但是,该死的,这种变化并不好玩.

您需要扩展RequestMappingHandlerAdapter该类并重写以下方法

/**
 * Template method to create a new InitBinderDataBinderFactory instance.
 * <p>The default implementation creates a ServletRequestDataBinderFactory.
 * This can be overridden for custom ServletRequestDataBinder subclasses.
 * @param binderMethods {@code @InitBinder} methods
 * @return the InitBinderDataBinderFactory instance to use
 * @throws Exception in case of invalid state or arguments
 */
protected InitBinderDataBinderFactory createDataBinderFactory(List<InvocableHandlerMethod> binderMethods)
        throws Exception {

    return new ServletRequestDataBinderFactory(binderMethods, getWebBindingInitializer());
}

ServletRequestDataBinderFactory您需要返回InitBinderDataBinderFactory返回自定义WebDataBinder实例的自定义,而不是返回a .

此更改意味着您无法使用默认值@EnableWebMvc或<mvc:annotation-driven/>配置.这是因为它们RequestMappingHandlerAdapter默认使用,但您需要注册自己的类.

但是,您可以覆盖带@Bean注释的WebMvcConfigurationSupport#requestMappingHandlerAdapter()方法并提供自己的实现来返回自己的类型.查看该实现对提示的作用.