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README.md

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 # csvconvert
 
-简单的csv转xls工具
+简单的csv转xls工具
+
+## 使用说明
+
+打包后运行命令行
+
+```cmd
+java -jar csvconvert.jar --f=csv文件.csv --c=csv文件编码格式
+```

pom.xml

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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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>io.lroyia</groupId>
+    <artifactId>csvconvert</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-csv -->
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-csv</artifactId>
+            <version>1.8</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
+        <dependency>
+            <groupId>org.apache.poi</groupId>
+            <artifactId>poi</artifactId>
+            <version>4.1.2</version>
+        </dependency>
+
+    </dependencies>
+
+</project>

src/main/java/io/lroyia/ApplicationRun.java

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+package io.lroyia;
+
+import org.apache.commons.csv.CSVFormat;
+import org.apache.commons.csv.CSVParser;
+import org.apache.commons.csv.CSVRecord;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.Charset;
+import java.util.List;
+
+/**
+ * 主启动类
+ * @author <a href="https://blog.lroyia.top">lroyia</a>
+ * @since 2021/3/22 14:46
+ **/
+public class ApplicationRun {
+
+    public static void main(String[] args) throws IOException {
+        String chartSet = "utf8";
+        String fileUri = null;
+        for (String arg : args) {
+            if(arg.startsWith("--")) {
+                String[] argSplit = arg.split("=");
+                if(argSplit[0].equals("--f")){
+                    fileUri = argSplit[1];
+                }else if(argSplit[0].equals("--c")){
+                    chartSet = argSplit[1];
+                }
+            }
+        }
+        if(fileUri == null){
+            System.out.println("please select a convert file.");
+            return;
+        }
+        File file = new File(fileUri);
+        String fileName = file.getName();
+        String newFileName = fileName.replace(".csv", ".xls");
+        try(CSVParser csv = CSVParser.parse(file, Charset.forName(chartSet), CSVFormat.DEFAULT);
+            OutputStream os = new FileOutputStream(newFileName)){
+            List<String> headerNames = csv.getHeaderNames();
+            System.out.println(headerNames);
+            HSSFWorkbook workbook = new HSSFWorkbook();
+            Sheet sheet = workbook.createSheet();
+            Row header = sheet.createRow(0);
+            int colLength = headerNames.size();
+            System.out.println(colLength);
+            List<CSVRecord> records = csv.getRecords();
+            System.out.println(records.size());
+            for (int i = 0; i < colLength; i++) {
+                createCell(header, i, headerNames.get(i));
+            }
+            long lastCol = csv.getRecordNumber();
+            for(int i = 0; i < lastCol; i++){
+                Row curRow = sheet.createRow(i+1);
+                CSVRecord curRecord = records.get(i);
+                for(int j = 0; j < curRecord.size(); j++){
+                    createCell(curRow, j, curRecord.get(j));
+                }
+            }
+            workbook.write(os);
+        }
+
+    }
+
+    /**
+     * 创建单元格并设置值
+     * @param row   行
+     * @param colIndex  列序号
+     * @param value 值
+     * @return  创建结果
+     * @author lroyia
+     * @since 2021年3月22日 16:06:57
+     */
+    public static Cell createCell(Row row, int colIndex, String value){
+        Cell cell = row.createCell(colIndex);
+        cell.setCellValue(value);
+        return cell;
+    }
+}