springMVC 注解标签 结合 <context:component-scan>使用的功能等效于 <bean id="XXX" class="XXX">

1.如果不想在xml文件中配置bean，我们可以给我们的类加上spring组件注解，只需再配置下spring的扫描器就可以实现bean的自动载入。比如：

package com.org.base.web.controller;

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.ModelAndView;

import com.tentcoo.base.constant.Attrs;
import com.tentcoo.base.entity.Kindergarten;
import com.tentcoo.base.entity.Teacher;
import com.tentcoo.base.entity.TeacherCard;
import com.tentcoo.base.entity.YzFunction;
import com.tentcoo.base.entity.YzFunctionTeacher;
import com.tentcoo.base.entity.YzRole;
import com.tentcoo.base.service.KindergartenService;
import com.tentcoo.base.service.PrincipalService;
import com.tentcoo.base.service.TeacherCardService;
import com.tentcoo.base.service.YzFunctionTeacherService;
import com.tentcoo.base.service.YzFunctionYzRoleService;
import com.tentcoo.core.util.HashPathUtil;
import com.tentcoo.core.util.PropertiesUtil;
import com.tentcoo.core.util.QiniuUtil;
import com.tentcoo.core.util.SHAencryptUtil;

@Scope(“prototype”) //多例模式
@Controller //注解为controller层,功能类似于XML配置文件中的
@RequestMapping(value = “/principal”) //请求的相对路径
public class UserController {

@Resource          //注入别的实例，功能类似于xml配置文件中的<property name="principalService"  ref="XXX"/>private PrincipalService principalService;@Resourceprivate TeacherCardService teacherCardService;@Resourceprivate KindergartenService kindergartenService;@Resourceprivate YzFunctionTeacherService yzFunctionTeacherService;@Resourceprivate YzFunctionYzRoleService yzFunctionYzRoleService;private static final Logger log = LoggerFactory.getLogger(UserController.class);

}

2：在XML配置文件中进行组件扫描即可

<mvc:annotation-driven />    <context:component-scan base-package="com.tentcoo.base.web.controller" />

3：上面两步就代替了XML配置文件中

<bean id="controller" class="com.org.base.web.controller.UserController ">          <property name="principalService"  ref="XXX"/>      </bean>