在 spring 注解实现里，一个接口一般是不能多继承的!

除非在 bean 配置文件里有 针对这个 实现类的配置:

接口与服务实现类 目录结构:

serviceImpl 下两个  实现类 都继承 自 service 下的 ICServic.java 接口;

如果没有做上面的配置，会提示 No unique bean of type [multiimpl.service.ICService] is defined: expected single match bean but found 2;

xxxController.java 文件内，Autowired 的使用:

package com.study.interceptor.controller;import multimpl.service.ICService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;@Controllerpublic class WelcomeController {        @Autowired    private ICService icService;    @RequestMapping(value = "welcome")    public String welcome(Model model) {        model.addAttribute("Welcome", "Welcome To Custom Interceptor!");                String str = "Go Where!";        String result = icService.commonService(str);        model.addAttribute("mutlservice", result);                return "welcome";     }}