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20210902 增加 poi 的最佳实践
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‎README.md‎

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## 项目3：poi-practice
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### 参考文档
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- [进行Junit测试时 从 Resources读取文件](https://blog.csdn.net/weixin_40040107/article/details/90679413)
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- [JAVA实现POI对excel操作，超方便实用【实践代码】](https://www.jianshu.com/p/d63571a8195c)
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- [JAVA POI报错：org.openxmlformats.schemas.wordprocessingml.x2006.main.impl.CTRImpl.getXmlObjectArray](https://blog.csdn.net/u011781521/article/details/116260483)
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‎poi-practice/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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.coderdream</groupId>
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<artifactId>poi-practice</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>poi-practice</name>
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<!-- FIXME change it to the project's website -->
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<url>http://www.example.com</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<poi.version>5.0.0</poi.version>
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</properties>
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<dependencies>
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<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi</artifactId>
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<version>${poi.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml</artifactId>
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<version>${poi.version}</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
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<!--
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml-schemas</artifactId>
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<version>${poi.version}</version>
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</dependency>
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-->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi</artifactId>
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<version>5.0.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-scratchpad</artifactId>
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<version>5.0.0</version>
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</dependency>
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<!-- <dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml-schemas</artifactId>
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<version>4.1.2</version>
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</dependency>-->
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<dependency>
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<groupId>org.apache.poi</groupId>
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<artifactId>poi-ooxml-full</artifactId>
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<version>5.0.0</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>3.12.0</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.20</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>3.1.0</version>
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</dependency>
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<!-- 文件上传依赖包 -->
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<dependency>
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<groupId>commons-io</groupId>
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<artifactId>commons-io</artifactId>
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<version>2.4</version>
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</dependency>
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<!-- 文件上传包 -->
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<dependency>
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<groupId>commons-fileupload</groupId>
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<artifactId>commons-fileupload</artifactId>
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<version>1.3.1</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
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<plugins>
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<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
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<plugin>
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<artifactId>maven-clean-plugin</artifactId>
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<version>3.1.0</version>
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</plugin>
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<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
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<plugin>
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<artifactId>maven-resources-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<version>2.5.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<version>2.8.2</version>
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</plugin>
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<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
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<plugin>
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<artifactId>maven-site-plugin</artifactId>
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<version>3.7.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-project-info-reports-plugin</artifactId>
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<version>3.0.0</version>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>

‎poi-practice/src/main/java/com/coderdream/App.java‎

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package com.coderdream;
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/**
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* Hello world!
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*
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*/
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public class App
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{
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public static void main( String[] args )
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{
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System.out.println( "Hello World!" );
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}
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}

‎poi-practice/src/main/java/com/coderdream/CharsetKit.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 17:09
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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 org.apache.commons.lang3.StringUtils;
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import java.nio.charset.Charset;
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import java.nio.charset.StandardCharsets;
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/**
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* 字符集工具类
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*
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* @author ruoyi
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*/
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public class CharsetKit
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{
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/** ISO-8859-1 */
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public static final String ISO_8859_1 = "ISO-8859-1";
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/** UTF-8 */
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public static final String UTF_8 = "UTF-8";
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/** GBK */
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public static final String GBK = "GBK";
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/** ISO-8859-1 */
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public static final Charset CHARSET_ISO_8859_1 = Charset.forName(ISO_8859_1);
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/** UTF-8 */
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public static final Charset CHARSET_UTF_8 = Charset.forName(UTF_8);
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/** GBK */
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public static final Charset CHARSET_GBK = Charset.forName(GBK);
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/**
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* 转换为Charset对象
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*
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* @param charset 字符集，为空则返回默认字符集
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* @return Charset
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*/
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public static Charset charset(String charset)
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{
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return StringUtils.isEmpty(charset) ? Charset.defaultCharset() : Charset.forName(charset);
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}
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/**
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* 转换字符串的字符集编码
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*
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* @param source 字符串
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* @param srcCharset 源字符集，默认ISO-8859-1
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* @param destCharset 目标字符集，默认UTF-8
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* @return 转换后的字符集
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*/
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public static String convert(String source, String srcCharset, String destCharset)
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{
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return convert(source, Charset.forName(srcCharset), Charset.forName(destCharset));
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}
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/**
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* 转换字符串的字符集编码
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*
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* @param source 字符串
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* @param srcCharset 源字符集，默认ISO-8859-1
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* @param destCharset 目标字符集，默认UTF-8
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* @return 转换后的字符集
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*/
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public static String convert(String source, Charset srcCharset, Charset destCharset)
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{
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if (null == srcCharset)
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{
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srcCharset = StandardCharsets.ISO_8859_1;
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}
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if (null == destCharset)
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{
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destCharset = StandardCharsets.UTF_8;
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}
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if (StringUtils.isEmpty(source) || srcCharset.equals(destCharset))
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{
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return source;
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}
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return new String(source.getBytes(srcCharset), destCharset);
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}
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/**
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* @return 系统字符集编码
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*/
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public static String systemCharset()
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{
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return Charset.defaultCharset().name();
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}
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}
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‎poi-practice/src/main/java/com/coderdream/Common.java‎

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package com.coderdream;
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/**
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* @author Hongten
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* @created 2014-5-21
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*/
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public class Common {
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public static final String OFFICE_EXCEL_2003_POSTFIX = "xls";
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public static final String OFFICE_EXCEL_2010_POSTFIX = "xlsx";
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public static final String EMPTY = "";
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public static final String POINT = ".";
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public static final String LIB_PATH = Class.class.getClass().getResource("/").getPath();;
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public static final String STUDENT_INFO_XLS_PATH = LIB_PATH + "/student_info" + POINT + OFFICE_EXCEL_2003_POSTFIX;
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public static final String STUDENT_INFO_XLSX_PATH = LIB_PATH + "/student_info" + POINT + OFFICE_EXCEL_2010_POSTFIX;
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public static final String STUDENT_INFO_XLS_OUT_PATH = LIB_PATH + "/student_info_2003-2007.xls";
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public static final String STUDENT_INFO_XLSX_OUT_PATH = LIB_PATH + "/student_info_2010.xlsx";
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public static final String NOT_EXCEL_FILE = " : Not the Excel file!";
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public static final String PROCESSING = "Processing...";
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public static final String WRITE_DATA = "write data to file : ";
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}

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