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java - Spring @Autowired变量在@Component内部为空

转载 作者：搜寻专家 更新时间：2023-11-01 00:55:49 25 4
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这是我的组件，它包含自动连接的 userService。问题是没有初始化，一直是null。用户服务在 Controller 中运行良好。

组件内部的 Autowiring 服务应该怎么做？ 

package com.boro.orange.component;

@Component("modelUtil")
public class ModelUtil {
    @Autowired
    private UserService userService; //null

    static Logger log = Logger.getLogger(ModelUtil.class.getName());

    public ModelMap warp(ModelMap model) {

        Object springUserObject = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
        if (springUserObject == null || !(springUserObject instanceof User)) {
            return model;
        }
        User springUser = (User) springUserObject;
        String userEmailAddress = springUser.getUsername();
        com.boro.orange.entity.User signedInUser = userService.getUserByEmailAddress(userEmailAddress);

        if (signedInUser == null) {
            String errorMsg = "Failed to find user by email address[" + userEmailAddress + "]";
            log.error(errorMsg);
            model.addAttribute("Error", errorMsg);
            // TODO add error messages
        } else {
            String userFirstName = signedInUser.getFirstName();
            String userLastName = signedInUser.getLastName();

            model.addAttribute("userFirstName", userFirstName);
            model.addAttribute("userLastName", userLastName);
        }

        return model;
    }
}

root-context.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">

    <context:annotation-config/>

    <context:component-scan base-package="com.boro.orange.dao"/>
    <context:component-scan base-package="com.boro.orange.service"/>
    <context:component-scan base-package="com.boro.orange.component"/>
    <context:component-scan base-package="com.boro.orange.controller"/>

    <import resource="data.xml"/>

</beans>

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