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新增【依赖注入-设计模式】项目
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‎README.md‎

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## 项目实践系列
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[【项目实践】一文带你搞定前后端分离下的认证和授权|Spring Security + JWT](https://github.com/RudeCrab/rude-java/tree/master/project-practice/springsecurity)
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[【项目实践】一文带你搞定页面权限、按钮权限以及数据权限](https://github.com/RudeCrab/rude-java/tree/master/project-practice/rbac)
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[【项目实践】学习SpringBoot之前先学学SSM整合](https://github.com/RudeCrab/rude-java/blob/master/project-practice/ssm)
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[【项目实践】SpringBoot三招组合拳，手把手教你打出优雅的后端接口](https://github.com/RudeCrab/rude-java/blob/master/project-practice/validation-and-exception-handler)
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[【项目实践】后端接口统一规范的同时，如何优雅得扩展规范](https://github.com/RudeCrab/rude-java/blob/master/project-practice/validation-and-exception-handler2)
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[【项目实践】学习SpringBoot之前先学学SSM整合](https://github.com/RudeCrab/rude-java/blob/master/project-practice/ssm)
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[【项目实践】在用安全框架前，我想先让你手撸一个登陆认证](https://github.com/RudeCrab/rude-java/tree/master/project-practice/login-demo)
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[【项目实践】一文带你搞定页面权限、按钮权限以及数据权限](https://github.com/RudeCrab/rude-java/tree/master/project-practice/rbac)
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[【项目实践】一文带你搞定前后端分离下的认证和授权|Spring Security + JWT](https://github.com/RudeCrab/rude-java/tree/master/project-practice/springsecurity)
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[【项目实践】依赖注入用得好，设计模式轻松搞](https://github.com/RudeCrab/rude-java/tree/master/project-practice/di)
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[【项目实践】使用Vue.js和ElementUI快速实现后台管理系统的界面布局](https://github.com/RudeCrab/rude-java/blob/master/project-practice/vue-route-demo)
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## 联系方式
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![微信二维码](http://ww1.sinaimg.cn/large/dcdff92dgy1glnmky7fb7j20p00dwdig.jpg)
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> 博客、Github、微信公众号都是：**RudeCrab**，欢迎关注！如果对你有帮助可以收藏、点赞、star、在看、分享~~ 你的支持，就是我写文的最大动力
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>
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> 微信上转载请联系公众号开启白名单，其他地方转载请标明原地址、原作者！
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> 微信上转载请联系公众号【RudeCrab】开启白名单，其他地方转载请标明原地址、原作者！
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‎project-practice/di/.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/

‎project-practice/di/READEME.md‎

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# 【项目实践】依赖注入用得好，设计模式轻松搞
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## 项目运行
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本项目使用Spring Boot搭建，主要讲解设计模式在Spring框架下的运用！代码比较简单，重点是思路。
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讲项目导入到IDE即可运行，默认端口8080。
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## 文章讲解
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https://juejin.cn/post/6914815944644624391
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![微信二维码](http://ww1.sinaimg.cn/large/dcdff92dgy1glnmky7fb7j20p00dwdig.jpg)

‎project-practice/di/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.4.1</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.rudecrab</groupId>
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<artifactId>di</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>di</name>
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<description>Demo project for dependency injection</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎project-practice/di/src/main/java/com/rudecrab/di/DiApplication.java‎

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package com.rudecrab.di;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class DiApplication {
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public static void main(String[] args) {
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SpringApplication.run(DiApplication.class, args);
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}
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}

‎project-practice/di/src/main/java/com/rudecrab/di/chain/BossHandler.java‎

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package com.rudecrab.di.chain;
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import org.springframework.core.annotation.Order;
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import org.springframework.stereotype.Service;
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/**
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* @author RudeCrab
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*/
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@Order(3)
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@Service
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public class BossHandler implements Handler {
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@Override
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public boolean process(MyRequest request) {
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System.out.println(String.format("Boss已审批【%s】的【%d】天请假申请", request.getName(), request.getDay()));
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// 中止
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return false;
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}
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}

‎project-practice/di/src/main/java/com/rudecrab/di/chain/ChainController.java‎

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package com.rudecrab.di.chain;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.*;
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import java.util.List;
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/**
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* @author RudeCrab
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*/
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@RestController
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@RequestMapping("/chain")
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public class ChainController {
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@Autowired
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private List<Handler> handlers;
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@PostMapping
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public void process(@RequestBody MyRequest request) {
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System.out.println("---");
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// 依次调用Handler
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for (Handler handler : handlers) {
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// 如果返回为false,中止调用
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if (!handler.process(request)) {
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break;
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}
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}
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}
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}

‎project-practice/di/src/main/java/com/rudecrab/di/chain/Handler.java‎

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package com.rudecrab.di.chain;
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/**
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* @author RudeCrab
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*/
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public interface Handler {
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/**
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* 处理请假申请
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* @param request 请假申请
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* @return true则放行，false则中止
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*/
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boolean process(MyRequest request);
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}

‎project-practice/di/src/main/java/com/rudecrab/di/chain/LeaderHandler.java‎

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package com.rudecrab.di.chain;
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import org.springframework.core.annotation.Order;
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import org.springframework.stereotype.Service;
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/**
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* @author RudeCrab
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*/
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@Order(1)
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@Service
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public class LeaderHandler implements Handler{
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@Override
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public boolean process(MyRequest request) {
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if (request.getDay() <= 3) {
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System.out.println(String.format("Leader已审批【%s】的【%d】天请假申请", request.getName(), request.getDay()));
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// 处理完毕，不放行
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return false;
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}
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System.out.println(String.format("Leader无法审批【%s】的【%d】天请假申请", request.getName(), request.getDay()));
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// 放行
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return true;
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}
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}

‎project-practice/di/src/main/java/com/rudecrab/di/chain/ManagerHandler.java‎

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package com.rudecrab.di.chain;
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import org.springframework.core.annotation.Order;
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import org.springframework.stereotype.Service;
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/**
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* @author RudeCrab
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*/
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@Order(2)
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@Service
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public class ManagerHandler implements Handler{
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@Override
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public boolean process(MyRequest request) {
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if (request.getDay() <= 7) {
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System.out.println(String.format("Manger已审批【%s】的【%d】天请假申请", request.getName(), request.getDay()));
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// 处理完毕，不放行
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return false;
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}
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System.out.println(String.format("Manger无法审批【%s】的【%d】天请假申请", request.getName(), request.getDay()));
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// 放行
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return true;
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}
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}

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