我不明白，为什么找不到类CategoryFormatter.java。 （IntellijIdea + Tomcat 9 + Maven）
mvc-core.config
<mvc:annotation-driven conversion-service="conversionService"/>
<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<property name="formatters">
<set>
<bean class="diplom.whatsnew.server.web.CategoryFormatter"/>
</set>
</property>
</bean>
WhatsNewService.java
package diplom.whatsnew.server.service;
import diplom.whatsnew.server.model.*;
import org.springframework.dao.DataAccessException;
import javax.jws.soap.SOAPBinding;
import java.util.Collection;
public interface WhatsNewService {
Collection<Category> findCategory() throws DataAccessException;
City findCityById(int id) throws DataAccessException;
Places findPlaceById(int id) throws DataAccessException;
void savePlace(Places place) throws DataAccessException;
void deletePlace(Places place) throws DataAccessException;
void saveEvents(Events events) throws DataAccessException;
void deleteEvente(Events events) throws DataAccessException;
void saveCity(City city) throws DataAccessException;
Collection<Users> findUsers() throws DataAccessException;
Collection<City> findCityByName(String name) throws DataAccessException;
}
CategoryFormatter.java
package diplom.whatsnew.server.web;
import diplom.whatsnew.server.model.Category;
import diplom.whatsnew.server.service.WhatsNewService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.Formatter;
import java.text.ParseException;
import java.util.Collection;
import java.util.Locale;
public class CategoryFormatter implements Formatter<Category> {
private final WhatsNewService whatsNewService;
@Autowired
public CategoryFormatter(WhatsNewService whatsNewService)
{
this.whatsNewService=whatsNewService;
}
@Override
public String print(Category category, Locale locale)
{
return category.getName();
}
@Override
public Category parse(String text,Locale locale) throws ParseException{
Collection<Category> findCategory=this.whatsNewService.findCategory();
for(Category category: findCategory){
if(category.getName().equals(text)){
return category;
}
}
throw new ParseException("type not found: " + text, 0);
}
}
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0" metadata-complete="true">
<display-name>Spring WhatsNew</display-name>
<description>Spring WhatsNew sample application</description>
<context-param>
<param-name>spring.profiles.active</param-name>
<param-value>jdbc</param-value>
</context-param>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/business-config.xml, classpath:spring/tools-config.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>whatsnew</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/mvc-core-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>whatsnew</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>dandelionServlet</servlet-name>
<servlet-class>com.github.dandelion.core.web.DandelionServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dandelionServlet</servlet-name>
<url-pattern>/dandelion-assets/*</url-pattern>
</servlet-mapping>
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>dandelionFilter</filter-name>
<filter-class>com.github.dandelion.core.web.DandelionFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>dandelionFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>datatables</filter-name>
<filter-class>com.github.dandelion.datatables.core.web.filter.DatatablesFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>datatables</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
错误
org.springframework.beans.factory.BeanCreationException：错误
在类路径中创建名称为“ conversionService”的bean
资源[spring / mvc-core-config.xml]：无法创建内部bean
类型的'diplom.whatsnew.server.web.CategoryFormatter＃19b8e7d5'
设置bean时[diplom.whatsnew.server.web.CategoryFormatter]
具有键[0]的属性“格式器”；嵌套异常为
org.springframework.beans.factory.CannotLoadBeanClassException：无法
查找bean的类[diplom.whatsnew.server.web.CategoryFormatter]
名称为“ diplom.whatsnew.server.web.CategoryFormatter＃19b8e7d5”
在类路径资源[spring / mvc-core-config.xml]中定义；嵌套的
异常是java.lang.ClassNotFoundException：
diplom.whatsnew.server.web.CategoryFormatter
org.springframework.beans.factory.CannotLoadBeanClassException：无法
查找bean的类[diplom.whatsnew.server.web.CategoryFormatter]
名称为“ diplom.whatsnew.server.web.CategoryFormatter＃77b6dc78”
在类路径资源[spring / mvc-core-config.xml]中定义；嵌套的
异常是java.lang.ClassNotFoundException：
diplom.whatsnew.server.web.CategoryFormatter
java.lang.ClassNotFoundException：
diplom.whatsnew.server.web.CategoryFormatter
最佳答案
这里是bean定义的问题，Spring等待无参数构造函数：
<bean class="diplom.whatsnew.server.web.CategoryFormatter"/>
在你的课上，你有一个带有autowired参数的
@Autowired
public CategoryFormatter(WhatsNewService whatsNewService)
{
this.whatsNewService=whatsNewService;
}
所以没有创建bean
修复xml声明中的更改（mvc-core-config.xml）
<bean class="diplom.whatsnew.server.web.CategoryFormatter">
<constructor-arg ref="whatsNewService"/>
</bean>