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202109022011 增加《FreeMarker 快速入门》
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‎README.md‎

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# Java 架构师的工具箱
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## 项目1：junit5-practice
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### 参考文档
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- [Idea-Maven多模块开发](https://www.jianshu.com/p/274455dc9469)
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- [idea报错：Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile](https://blog.csdn.net/gao_jun1/article/details/109997200)
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- [junit5-examples](https://github.com/mkyong/junit5-examples)
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- [该升级你的JUnit版本了——JUnit5基本介绍](https://zhuanlan.zhihu.com/p/111706639)
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- [Java单元测试之JUnit 5快速上手【实践代码】](https://www.cnblogs.com/one12138/p/11536492.html)
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- [junit 5中三种不同指定用例测试顺序](https://blog.csdn.net/jackyrongvip/article/details/89389387)
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- [该升级你的JUnit版本了——JUnit5基本介绍](https://zhuanlan.zhihu.com/p/111706639)
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- [Java单元测试之JUnit 5快速上手【实践代码】](https://www.cnblogs.com/one12138/p/11536492.html)
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- [junit 5中三种不同指定用例测试顺序](https://blog.csdn.net/jackyrongvip/article/details/89389387)
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## 项目2：javamail-practice
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### 参考文档
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- [JavaMail 实现邮件推送功能(网易邮箱)](https://blog.csdn.net/weixin_43967679/article/details/107879747)
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- [Java中File使用--创建文件](https://blog.csdn.net/m0_37989184/article/details/93025734)
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- [FreeMarker 快速入门](https://www.cnblogs.com/itdragon/p/7750903.html)
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## 项目3：poi-practice
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## TODO
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- SendMail
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- 解析Excel
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- Swagger
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- sql过滤模糊查询条件中的特殊字符
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# 其他参考文档
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- [IDEA如何设置author头注解](https://blog.csdn.net/weixin_42555514/article/details/106826894)

‎javamail-practice/src/main/java/com/coderdream/AutoCodeDemo.java‎

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package com.coderdream;
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public class AutoCodeDemo {
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public static void main(String[] args) {
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System.out.println("通过简单的 <代码自动生产程序> 演示 FreeMarker的HelloWorld！");
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}
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}

‎javamail-practice/src/main/java/com/coderdream/FreemarkerDemo.java‎

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package com.coderdream;
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/**
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* @author ：CoderDream
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* @date ：Created in 2021/9/2 19:38
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* @description：
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* @modified By：CoderDream
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* @version: $
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*/
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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import java.util.*;
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import freemarker.template.Configuration;
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import freemarker.template.Template;
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/**
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* 最常见的问题：
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* java.io.FileNotFoundException: xxx does not exist. 解决方法：要有耐心
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* FreeMarker jar 最新的版本（2.3.23）提示 Configuration 方法被弃用
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* 代码自动生产基本原理：
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* 数据填充 freeMarker 占位符
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*/
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public class FreemarkerDemo {
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private static final String TEMPLATE_PATH = "/template";
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//private static final String CLASS_PATH = "src/main/java/com/coderdream/";
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private static final String CLASS_PATH = "javamail-practice/src/main/java/com/coderdream/";
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public static void main(String[] args) {
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method2();
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}
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private static void method1() {
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// step1 创建freeMarker配置实例
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Configuration configuration = new Configuration();
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Writer out = null;
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try {
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// step2 获取模版路径
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// configuration.setDirectoryForTemplateLoading(FreemarkerDemo.class, TEMPLATE_PATH);
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configuration.setClassForTemplateLoading(TemplateFactory.class, TEMPLATE_PATH);
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// step3 创建数据模型
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Map<String, Object> dataMap = new HashMap<String, Object>();
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dataMap.put("classPath", "com.coderdream");
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dataMap.put("className", "AutoCodeDemo");
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dataMap.put("helloWorld", "通过简单的 <代码自动生产程序> 演示 FreeMarker的HelloWorld！");
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// step4 加载模版文件
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Template template = configuration.getTemplate("hello.ftl");
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// step5 生成数据
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File docFile = new File(CLASS_PATH + "AutoCodeDemo.java");
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if(!docFile.exists()) {
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//docFile.mkdirs();
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docFile.createNewFile();
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}
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out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(docFile)));
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// step6 输出文件
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template.process(dataMap, out);
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System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^AutoCodeDemo.java 文件创建成功 !");
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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if (null != out) {
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out.flush();
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}
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} catch (Exception e2) {
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e2.printStackTrace();
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}
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}
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}
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private static void method2() {
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// step1 创建freeMarker配置实例
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Configuration configuration = new Configuration();
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Writer out = null;
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try {
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// step2 获取模版路径
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// configuration.setDirectoryForTemplateLoading(FreemarkerDemo.class, TEMPLATE_PATH);
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configuration.setClassForTemplateLoading(TemplateFactory.class, TEMPLATE_PATH);
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// step3 创建数据模型
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Map<String, Object> dataMap = new HashMap<String, Object>();
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dataMap.put("name", "itdragon博客");
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dataMap.put("dateTime", new Date());
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List<User> users = new ArrayList<User>();
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users.add(new User(1, "ITDragon 博客"));
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users.add(new User(2, "欢迎"));
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users.add(new User(3, "You！"));
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dataMap.put("users", users);
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// step4 加载模版文件
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Template template = configuration.getTemplate("stringFreeMarker.ftl");
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// step5 生成数据
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out = new OutputStreamWriter(System.out);
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// step6 输出文件
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template.process(dataMap, out);
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System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^AutoCodeDemo.java 文件创建成功 !");
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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if (null != out) {
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out.flush();
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}
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} catch (Exception e2) {
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e2.printStackTrace();
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}
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}
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}
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}

‎javamail-practice/src/main/java/com/coderdream/User.java‎

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package com.coderdream;
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/**
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* @author ：CoderDream
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* @date ：Created in 2021/9/2 20:07
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* @description：
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* @modified By：CoderDream
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* @version: $
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*/
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public class User {
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private Integer id;
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private String name;
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public User() {
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}
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public User(Integer id, String name) {
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this.id = id;
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this.name = name;
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}
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public Integer getId() {
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return id;
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}
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public void setId(Integer id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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@Override
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public String toString() {
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return "User [id=" + id + ", name=" + name + "]";
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}
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}

‎javamail-practice/src/main/resources/template/hello.ftl‎

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package ${classPath};
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public class ${className} {
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public static void main(String[] args) {
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System.out.println("${helloWorld}");
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}
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}

‎javamail-practice/src/main/resources/template/otherFreeMarker.ftl‎

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其他FreeMarker文件
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<#macro addMethod a b >
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result : ${a + b}
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</#macro>
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<#assign otherName="另外一个FreeMarker的变量">

‎javamail-practice/src/main/resources/template/stringFreeMarker.ftl‎

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字符串输出:
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${"Hello ${name} !"} / ${"Hello " + name + " !"}
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<#assign cname=r"特殊字符完成输出(http://www.baidu.com)">
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${cname}
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字符串截取 ：
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通过下标直接获取下标对应的字母： ${name[2]}
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起点下标..结尾下标截取字符串：${name[0..5]}
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算数运算：
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<#-- 支持"+"、"－"、"*"、"/"、"%"运算符 -->
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<#assign number1 = 10>
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<#assign number2 = 5>
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"+" : ${number1 + number2}
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"－" : ${number1 - number2}
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"*" : ${number1 * number2}
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"/" : ${number1 / number2}
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"%" : ${number1 % number2}
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比较运算符：
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<#if number1 + number2 gte 12 || number1 - number2 lt 6>
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"*" : ${number1 * number2}
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<#else>
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"/" : ${number1 / number2}
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</#if>
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内建函数：
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<#assign data = "abcd1234">
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第一个字母大写：${data?cap_first}
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所有字母小写：${data?lower_case}
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所有字母大写：${data?upper_case}
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<#assign floatData = 12.34>
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数值取整数：${floatData?int}
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获取集合的长度：${users?size}
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时间格式化：${dateTime?string("yyyy-MM-dd")}
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空判断和对象集合：
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<#if users??>
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<#list users as user >
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${user.id} - ${user.name}
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</#list>
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<#else>
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${user!"变量为空则给一个默认值"}
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</#if>
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Map集合：
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<#assign mapData={"name":"程序员", "salary":15000}>
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直接通过Key获取 Value值：${mapData["name"]}
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通过Key遍历Map：
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<#list mapData?keys as key>
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Key: ${key} - Value: ${mapData[key]}
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</#list>
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通过Value遍历Map：
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<#list mapData?values as value>
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Value: ${value}
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</#list>
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List集合：
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<#assign listData=["ITDragon", "blog", "is", "cool"]>
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<#list listData as value>${value} </#list>
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include指令：
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引入其他文件：<#include "otherFreeMarker.ftl" />
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macro宏指令：
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<#macro mo>
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定义无参数的宏macro--${name}
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</#macro>
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使用宏macro: <@mo />
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<#macro moArgs a b c>
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定义带参数的宏macro-- ${a+b+c}
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</#macro>
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使用带参数的宏macro: <@moArgs a=1 b=2 c=3 />
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命名空间：
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<#import "otherFreeMarker.ftl" as otherFtl>
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${otherFtl.otherName}
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<@otherFtl.addMethod a=10 b=20 />
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<#assign otherName="修改otherFreeMarker.ftl中的otherName变量值"/>
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${otherFtl.otherName}
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<#assign otherName="修改otherFreeMarker.ftl中的otherName变量值" in otherFtl />
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${otherFtl.otherName}

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