NoClassDefFoundError：UnsupportedFileFormatException当使用Apache poi写入Excel文件
我正在尝试使用Apache poi写入excel（.xlsx）文件，我在我的pom.xml文件中包含了apache poi依赖项。 但是我正在执行下面的exception。
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/UnsupportedFileFormatException at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at test.ExcelWriting.main(ExcelWriting.java:24) Caused by: java.lang.ClassNotFoundException: org.apache.poi.UnsupportedFileFormatException at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 13 more 代码和pom.xml指定如下。
我在下面的行中得到exception。
XSSFWorkbook myWorkBook = new XSSFWorkbook (fis);
码：
package test; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.Date; import java.util.HashMap; import java.util.Map; import java.util.Set; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class ExcelWriting { public static void main(String[] args) throws IOException{ File myFile = new File("/home/sabra/workspace/test/src/main/resources/test.xlsx"); FileInputStream fis = new FileInputStream(myFile); // Finds the workbook instance for XLSX file XSSFWorkbook myWorkBook = new XSSFWorkbook (fis); // Return first sheet from the XLSX workbook XSSFSheet mySheet = myWorkBook.getSheetAt(0); Map<String, Object[]> data = new HashMap<String, Object[]>(); data.put("7", new Object[] {7d, "Sonya", "75K", "SALES", "Rupert"}); data.put("8", new Object[] {8d, "Kris", "85K", "SALES", "Rupert"}); data.put("9", new Object[] {9d, "Dave", "90K", "SALES", "Rupert"}); // Set to Iterate and add rows into XLS file Set<String> newRows = data.keySet(); // get the last row number to append new data int rownum = mySheet.getLastRowNum(); for (String key : newRows) { // Creating a new Row in existing XLSX sheet Row row = mySheet.createRow(rownum++); Object [] objArr = data.get(key); int cellnum = 0; for (Object obj : objArr) { Cell cell = row.createCell(cellnum++); if (obj instanceof String) { cell.setCellValue((String) obj); } else if (obj instanceof Boolean) { cell.setCellValue((Boolean) obj); } else if (obj instanceof Date) { cell.setCellValue((Date) obj); } else if (obj instanceof Double) { cell.setCellValue((Double) obj); } } } // open an OutputStream to save written data into XLSX file FileOutputStream os = new FileOutputStream(myFile); myWorkBook.write(os); myWorkBook.close(); } }
双响炮：
<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>test</groupId> <artifactId>test</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.8</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.11-beta2</version> </dependency> </dependencies> </project>
我认为你错过了一些类“UnsupportedFileFormatException”
尝试改变poi版本，并不使用3.11-beta2
你可以在版本3.12中使用http://mvnrepository.com/artifact/org.apache.poi
我试过你的代码使用Jar的Libs而不是maven（请参阅项目的图像），它工作正常。 所以就像Athi说的，你错过了一些库或者你的文件的types不是xlsx。
PS：我刚刚改变了这一行代码
File myFile = new File("/home/sabra/workspace/test/src/main/resources/test.xlsx");
至
File myFile = new File("test.xlsx");