@Autowired自动注入失败

Posted 2022-01-31 ryq1121

新手注意的问题

package cn.ryq.web.controller;

import cn.ryq.domain.company.Company;
import cn.ryq.service.company.CompanyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.Date;
import java.util.List;

@Controller
@RequestMapping("/system/company")
public class CompanyController 
    @Autowired
    public CompanyService companyService;

    @RequestMapping("/list.do")
    public ModelAndView list()
        List<Company> list = companyService.findAll();
        ModelAndView mv= new ModelAndView();
        mv.addObject("list",list );
        mv.setViewName("company/company-list");
        return mv;
    

在确保ApplicationContext-service.xml,有扫包(可以通过右边的小叶子图标来查看是否有扫到包)CompanyController控制器中有@Controller,再检查web.xml的配置,
一般情况下我们都是用多个模块去完成一个项目,那么web.xml下就如下配置,

<context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath*:spring/applicationContext-*.xml</param-value>
</context-param>
加载配置文件的路径加*,让web可以扫到整个项目的配置文件!