spring mvc javaConfig版本搭建常见问题

今天在spring mvc javaConfig版本框架搭建上耗了一天，终于给搭建出来了，下面是搭建过程中遇到的一些问题，记录下来方便以后复习，也为程序员兄弟们提供参考：

javaConfig spring mvc核心配置文件中对资源文件处理的适配置配置中MediaType的实例化问题：用一个字符串参数来创建org.springframework.http.MediaType实例的时候，用MediaType.valueOf（String）方法，不能用new MediaType(String)不然会报错；（Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter]: Factory method 'annotationMethodHandlerAdapter' threw exception; nested exception is java.lang.IllegalArgumentException: Invalid token character '/' in token "text/html"）

package com.springmvc.config;import com.springmvc.util.FastJsonHttpMessageConverter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.http.MediaType;import org.springframework.web.multipart.commons.CommonsMultipartResolver;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter;import org.springframework.web.servlet.view.InternalResourceViewResolver;import java.util.ArrayList;import java.util.List;/** * Created by baich on 2016/1/26. */@Configuration@EnableWebMvc@ComponentScan(basePackages = {"com.springmvc.controller"})public class SpringServlet extends WebMvcConfigurerAdapter {    /**     * 服务器内部资源解析器     * @return     */    @Bean    public InternalResourceViewResolver internalResourceViewResolver() {        InternalResourceViewResolver irvr = new InternalResourceViewResolver();        irvr.setPrefix("/");        irvr.setSuffix(".jsp");        return irvr;    }    /**     * mediaType supportMediaTypes converter converters     * 媒体适配器配置     * @return     */    @Bean    public AnnotationMethodHandlerAdapter annotationMethodHandlerAdapter() {        AnnotationMethodHandlerAdapter amha = new AnnotationMethodHandlerAdapter();        FastJsonHttpMessageConverter[] messageConverters = new FastJsonHttpMessageConverter[1];        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();        List<MediaType> supportedMediaTypes = new ArrayList<MediaType>();//        MediaType mediaType = new MediaType(MediaType.TEXT_HTML_VALUE);        MediaType mediaType = MediaType.valueOf(MediaType.TEXT_HTML_VALUE);        supportedMediaTypes.add(mediaType);        fastJsonHttpMessageConverter.setSupportedMediaTypes(supportedMediaTypes);        messageConverters[0] = fastJsonHttpMessageConverter;        amha.setMessageConverters(messageConverters);        return amha;    }    /**     *     * @return     */    @Bean    public CommonsMultipartResolver multipartResolver() {        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();        multipartResolver.setDefaultEncoding("utf-8");        multipartResolver.setMaxUploadSize(2048 * 1024);        multipartResolver.setMaxInMemorySize(2048);        return multipartResolver;    }}

javaConfig ComponentScan注解默认包是什么都没有，所以必须自己动手配置指定包（

@ComponentScan(basePackages = {"com.springmvc.service.impl","com.springmvc.dao.impl"})）

（org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.springmvc.controller.UserController.setUserService(com.springmvc.service.UserService); nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.springmvc.service.UserService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

）

fastjson2.7.0和spring4.2.4不匹配，只要把fastjson版本降成2.6.5就行了（

com.fasterxml.jackson.databind.type.TypeFactory.constructType(Ljava/lang/reflect/Type;Ljava/lang/Class;)Lcom/fasterxml/jackson/databind/JavaType;

）

事务管理器配置sessionFactory的时候虽然显示的是ref LocalSessionFactoryBean类对应的bean,但是实际上是ref了LocalSessionFactoryBean 中的sessionFactory属性，sessionFactory = getBean("LocalSessionFactoryBean").getObject()。

http://stackoverflow.com/questions/31281179/error-java-lang-illegalargumentexception-invalid-token-character-in-token

写junit测试用例的时候在没有为测试用例注解@WebAppConfiguration的基础上引入了Spring MVC的核心配置文件类报错：Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'defaultServletHandlerMapping' threw exception; nested exception is java.lang.IllegalArgumentException: A ServletContext is required to configure default servlet handling

顾名思义，在没有注解@WebAppConfiguration的时候只要不引入spring mvc核心配置就能解决问题，当然了也可以引入@WebAppConfiguration:

http://www.4byte.cn/question/77524/java-lang-illegalargumentexception-a-servletcontext-is-required-to-configure-default-servlet-handling.html

import com.springmvc.po.User;import com.springmvc.service.UserService;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import org.junit.Test;import org.springframework.test.context.web.WebAppConfiguration;/** * Created by baich on 2016/1/26. */@RunWith(SpringJUnit4ClassRunner.class)@WebAppConfiguration@ContextConfiguration(classes = {com.springmvc.config.ApplicationContext.class, com.springmvc.config.SpringServlet.class})public class SpringTest {    @Autowired    private UserService userService;    @Test    public void save() {        User user = new User();        user.setName("yangbo");        user.setGender("male");        user.setDescribtion("javaConfig");        userService.save(user);    }}

OR

import com.springmvc.po.User;import com.springmvc.service.UserService;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import org.junit.Test;import org.springframework.test.context.web.WebAppConfiguration;/** * Created by baich on 2016/1/26. */@RunWith(SpringJUnit4ClassRunner.class)//@WebAppConfiguration@ContextConfiguration(classes = {com.springmvc.config.ApplicationContext.class})public class SpringTest {    @Autowired    private UserService userService;    @Test    public void save() {        User user = new User();        user.setName("yangbo");        user.setGender("male");        user.setDescribtion("javaConfig");        userService.save(user);    }}

测试编写的时候如果不用注解形式获取bean而采用ApplicationContext的形式获取bean一定要注意getBean("")后强转为接口类型，不能强转为实现类类型，不然会报错：

代码

import com.sunsharing.po.User;import com.sunsharing.service.impl.UserServiceImpl;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * Created by baich on 2016/1/27. */public class BaseTest {    @Test    public void test() {        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");        UserServiceImpl userServiceImpl = (UserServiceImpl) ac.getBean("userService");        User user = new User();        user.setName("yangbo");        user.setGender("male");        user.setDescribtion("am a boy");        userServiceImpl.save(user);    }}

错误

java.lang.ClassCastException: com.sun.proxy.$Proxy18 cannot be cast to com.sunsharing.service.impl.UserServiceImpl