@Service,@Resource和@Qualifier的简单使用

当一条业务线需要多种逻辑时，但是接口已经写好了，如果在接口上新增新的方法，务必使得实现该接口的类又要使用多余的方法，可以使用新的类继承老的类，重写该方法

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import com.java.bean.RecyMem; import com.java.mapper.RecyMemoMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;   import java.util.List;   /**  * @author yourheart  * @Description  * @create 2021-05-14 1:02  */ @Service("adminRecyMemoService") public class AdminRecyMemoServiceImpl extends UniversalRecyMemoServiceImpl{       @Autowired     private RecyMemoMapper recyMemoMapper;       @Override     public List<RecyMem> getListByUser(String userName, String content) {         if ("tangziwei".equals(userName)){             userName="";         }         RecyMem recyMem=new RecyMem();         recyMem.setRecycledMemoContent(content);         recyMem.setUser(userName);         List<RecyMem> listByUser = recyMemoMapper.getListByUser(recyMem);         return listByUser;     }     }

　　

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import com.java.bean.PrivateMemo; import com.java.bean.PumBean; import com.java.bean.RecyMem; import com.java.bean.ResponseBean; import com.java.enums.MemoEnum; import com.java.mapper.PumMapper; import com.java.mapper.RecyMemoMapper; import com.java.service.PrivateMemoService; import com.java.service.RecyMemoService; import com.java.utils.TimeUtils; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service;   import java.util.List;   /**  * @Description  * @Author qiuxie  * @Date 2021/7/1 7:52  */ @Service("universalRecyMemoServiceImpl") @Slf4j public class UniversalRecyMemoServiceImpl implements RecyMemoService {       @Autowired     private RecyMemoMapper recyMemoMapper;       @Autowired     private PumMapper pumMapper;       @Autowired     private PrivateMemoService privateMemoService;         @Override     public List<RecyMem> getListByUser(String userName, String content) {         return null;     }       @Override     public ResponseBean recoverMemo(String id, String userName) {         RecyMem recyMem = recyMemoMapper.getOne(id);         ResponseBean responseBean = new ResponseBean();         if (MemoEnum.PUBLIC_MEMO.getCode().equals(recyMem.getSign())) {             //公有备忘录             PumBean pumBean = new PumBean();             pumBean.setMemoContent(recyMem.getRecycledMemoContent());             pumBean.setPublicMemoUser(recyMem.getUser() == null ? userName : recyMem.getUser());             pumBean.setMemoTime(recyMem.getRecycledMemoOperateTime() == null ? TimeUtils.getTime() : recyMem.getRecycledMemoOperateTime());             pumBean.setMemoOperateTime(recyMem.getRecycledMemoOperateTime() == null ? TimeUtils.getTime() : recyMem.getRecycledMemoOperateTime());             int addPublicMemo = pumMapper.addPublicMemo(pumBean);             if (addPublicMemo == 0) {                 responseBean.setCode("-100");                 responseBean.setMsg("公有备忘录数据恢复失败");                 log.info("responseBean:{}", responseBean);                 return responseBean;             }             int delets = recyMemoMapper.delets(String.valueOf(recyMem.getId()));             if (delets == 0) {                 responseBean.setCode("-101");                 responseBean.setMsg("回收站公有备忘录数据删除失败");                 log.info("responseBean:{}", responseBean);                 return responseBean;             }             responseBean.setCode("100");             responseBean.setMsg("公有备忘录数据恢复成功");             log.info("responseBean:{}", responseBean);             return responseBean;           } else {             //私有备忘录             PrivateMemo privateMemo = PrivateMemo.builder().content(recyMem.getRecycledMemoContent()).updatePrivateMemoTime(recyMem.getRecycledMemoOperateTime() == null ? TimeUtils.getTime() : recyMem.getRecycledMemoOperateTime()).addPrivateMemoTime(recyMem.getRecycledMemoOperateTime() == null ? TimeUtils.getTime() : recyMem.getRecycledMemoOperateTime()).addUser(recyMem.getUser() == null ? userName : recyMem.getUser()).build();             ResponseBean bean = privateMemoService.addMemo(privateMemo);             log.info("【私有备忘录】bean:{}", bean);             if (bean.getCode().equals("-100") || bean.getCode().equals("-101")) {                 responseBean.setCode("-102");                 responseBean.setMsg("私有备忘录数据恢复失败");                 log.info("responseBean:{}", responseBean);                 return responseBean;             }             int delets = recyMemoMapper.delets(String.valueOf(recyMem.getId()));             if (delets == 0) {                 responseBean.setCode("-103");                 responseBean.setMsg("回收站私有备忘录数据删除失败");                 log.info("responseBean:{}", responseBean);                 return responseBean;             }             responseBean.setCode("101");             responseBean.setMsg("私有备忘录数据恢复成功");             log.info("responseBean:{}", responseBean);             return responseBean;         }     } }

　　不同的类在@Service里面写上不同的名字

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import java.util.HashMap; import java.util.List; import java.util.Map;   import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; import com.java.bean.RecyMem; import com.java.mapper.RecyMemoMapper; import com.java.service.RecyMemoService;   import javax.annotation.Resource; import javax.servlet.http.HttpSession;   /**  * 作者 邱燮 时间: 2020/6/15 17:32 描述  */ @Controller @RequestMapping("/recyM") public class RecyMemoController {     private static  final Logger logger = LoggerFactory.getLogger(RecyMemoController.class);       @Autowired     private RecyMemoMapper recyMemoMapper;       @Resource(name = "adminRecyMemoService")     private RecyMemoService recyMemoService;       @Resource(name = "universalRecyMemoServiceImpl")     private RecyMemoService resumeMemo;         /**      * 垃圾桶备忘录恢复      * @param idList      * @return      */     @PostMapping("/resumeMemo")     @ResponseBody     public String resumeMemo(@RequestParam(value = "idList") List<String> idList,HttpSession session){         String user = (String) session.getAttribute("user");         idList.stream().forEach(id->{             resumeMemo.recoverMemo(id,user);         });         return "1";     }         // 查询备忘录回收站中所有内容     @RequestMapping("/RecyledMemo")     public String recyledMemo(Model model,HttpSession session) {         String user = (String) session.getAttribute("user");         List<RecyMem> allRecyMemo =recyMemoService.getListByUser(user,"");         model.addAttribute("total", allRecyMemo.size());         return "recy/GetAllRecyledMemo";     }       @ResponseBody     @RequestMapping("/DataShow3")     public Map<String,Object> fdf(int curr, int limit,String content,HttpSession session){         String user = (String) session.getAttribute("user");         PageHelper.startPage(curr, limit);         List<RecyMem> allRecyMemo =recyMemoService.getListByUser(user,content);         PageInfo<RecyMem> pageInfo = PageInfo.of(allRecyMemo);         Map<String,Object> map=new HashMap<String,Object>();         map.put("data",pageInfo.getList());         map.put("ct",pageInfo.getTotal());         return map;     }     }

　　不同的名字，使用@Resource中写上对应的名字

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<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">     <modelVersion>4.0.0</modelVersion>     <parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-parent</artifactId>         <version>2.2.1.RELEASE</version> <!--     <version>2.3.4.RELEASE</version>-->         <relativePath/>     </parent>     <groupId>com.java</groupId>     <artifactId>pingan</artifactId>     <version>0.0.1-SNAPSHOT</version>     <name>pingan</name>     <description>Demo project for Spring Boot</description>       <properties>         <java.version>1.8</java.version>         <skipTests>true</skipTests>     </properties>       <dependencies>         <!--移除tomcat容器-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>             <exclusions>                 <exclusion>                     <groupId>org.springframework.boot</groupId>                     <artifactId>spring-boot-starter-tomcat</artifactId>                 </exclusion>             </exclusions>         </dependency>         <!--加入undertow-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-undertow</artifactId>         </dependency>         <!--实体类字段校验依赖-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-validation</artifactId>         </dependency>         <!--引入thymeleaf依赖-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-thymeleaf</artifactId>             <version>2.2.2.RELEASE</version>         </dependency>         <!--springboot整合mybatis-->         <dependency>             <groupId>org.mybatis.spring.boot</groupId>             <artifactId>mybatis-spring-boot-starter</artifactId>             <version>2.1.2</version>         </dependency>         <!-- mybatis pagehelper 分页插件 -->         <dependency>             <groupId>com.github.pagehelper</groupId>             <artifactId>pagehelper-spring-boot-starter</artifactId>             <version>1.2.10</version>         </dependency>         <!--springboot整合mongodb-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-data-mongodb</artifactId>         </dependency>         <dependency>             <groupId>org.mongodb</groupId>             <artifactId>mongo-java-driver</artifactId>             <version>3.0.4</version>         </dependency>         <!--引入shiro依赖-->         <dependency>             <groupId>org.apache.shiro</groupId>             <artifactId>shiro-core</artifactId>             <version>1.4.0</version>         </dependency>         <!--添加fastjson依赖-->         <dependency>             <groupId>com.alibaba</groupId>             <artifactId>fastjson</artifactId>             <!--<version>1.2.7</version>-->             <version>1.2.70</version>         </dependency>         <!--mysql驱动-->         <dependency>             <groupId>mysql</groupId>             <artifactId>mysql-connector-java</artifactId>             <version>5.1.6</version>         </dependency>         <!--腾讯云短信01-->         <!-- https://mvnrepository.com/artifact/com.github.qcloudsms/qcloudsms -->         <dependency>             <groupId>com.github.qcloudsms</groupId>             <artifactId>qcloudsms</artifactId>             <version>1.0.6</version>         </dependency>         <!--阿里云短信接口-->         <dependency>             <groupId>com.aliyun</groupId>             <artifactId>aliyun-java-sdk-core</artifactId>             <version>4.0.6</version> <!-- 注：如提示报错，先升级基础包版，无法解决可联系技术支持 -->         </dependency>         <dependency>             <groupId>com.aliyun</groupId>             <artifactId>aliyun-java-sdk-dysmsapi</artifactId>             <version>1.1.0</version>         </dependency>         <!--榛子云-->         <dependency>             <groupId>com.zhenzikj</groupId>             <artifactId>zhenzisms</artifactId>             <version>1.0.2</version>         </dependency>         <!-- 热部署模块 -->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-devtools</artifactId>             <optional>true</optional> <!-- 这个需要为 true 热部署才有效 -->         </dependency>         <!--java爬虫需要的jar包-->         <dependency>             <groupId>org.jsoup</groupId>             <artifactId>jsoup</artifactId>             <version>1.12.2</version>         </dependency>         <!--判断空的用法  -->         <dependency>             <groupId>commons-lang</groupId>             <artifactId>commons-lang</artifactId>             <version>2.6</version>         </dependency>         <!--邮件发送相关依赖三个-->         <dependency>             <groupId>commons-beanutils</groupId>             <artifactId>commons-beanutils</artifactId>             <version>1.9.4</version>         </dependency>         <dependency>             <groupId>commons-logging</groupId>             <artifactId>commons-logging</artifactId>             <version>1.2</version>         </dependency>         <dependency>             <groupId>javax.mail</groupId>             <artifactId>mail</artifactId>             <version>1.4.7</version>         </dependency>         <!--Spring Session使得基于Redis的Session共享-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-data-redis</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.session</groupId>             <artifactId>spring-session-data-redis</artifactId>         </dependency>           <!--lombok依赖-->         <dependency>             <groupId>org.projectlombok</groupId>             <artifactId>lombok</artifactId>             <version>1.18.16</version>         </dependency>         <!--拼音的依赖包-->         <dependency>             <groupId>com.belerweb</groupId>             <artifactId>pinyin4j</artifactId>             <version>2.5.1</version>         </dependency>         <!--springboot整合aop-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-aop</artifactId>         </dependency>           <!--springboot整合邮件发送-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-mail</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>             <scope>test</scope>         </dependency>           <!--ThreadFactoryBuilder的依赖包-->         <dependency>             <groupId>com.google.guava</groupId>             <artifactId>guava</artifactId>             <version>30.1-jre</version>         </dependency>             <!--引入jmockit依赖-->         <dependency>             <groupId>org.jmockit</groupId>             <artifactId>jmockit</artifactId>             <version>1.38</version>         </dependency>          <!--引入junit单元测试依赖-->         <dependency>             <groupId>junit</groupId>             <artifactId>junit</artifactId>             <version>4.12</version>         </dependency>     </dependencies>       <build>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>         <finalName>test</finalName>     </build>   </project>

pom文件依赖　

 对于两个不同的实现类实现了同一个接口，同时可以使用@Qualifier来匹配到我们需要的调用的实现类

 

 

 

 其中@Service里面的双引号是给不同的实现类定义的不同的名字，类似xml文件中<bean id="">中的id一样

下面给出如何使用

 

根据业务需要不同的功能调用对应的接口下不同的实现类，其中引入的包路径是

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;