Java生成CSV文件实例详解

这篇文章主要介绍了Java生成CSV文件的方法,很实用的功能,需要的朋友可以参考下

本文实例主要讲述了Java生成CSV文件的方法，具体实现步骤如下：

1、新建CSVUtils.java文件：

package com.saicfc.pmpf.internal.manage.utils; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.URLEncoder; import java.util.ArrayList; import java.util.Iterator; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletResponse; import org.apache.commons.beanutils.BeanUtils; /** * 文件操作 */ public class CSVUtils { /** * 生成为CVS文件 * @param exportData * 源数据List * @param map * csv文件的列表头map * @param outPutPath * 文件路径 * @param fileName * 文件名称 * @return */ @SuppressWarnings("rawtypes") public static File createCSVFile(List exportData, LinkedHashMap map, String outPutPath, String fileName) { File csvFile = null; BufferedWriter csvFileOutputStream = null; try { File file = new File(outPutPath); if (!file.exists()) { file.mkdir(); } //定义文件名格式并创建 csvFile = File.createTempFile(fileName, ".csv", new File(outPutPath)); System.out.println("csvFile：" + csvFile); // UTF-8使正确读取分隔符"," csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(new FileOutputStream( csvFile), "UTF-8"), 1024); System.out.println("csvFileOutputStream：" + csvFileOutputStream); // 写入文件头部 for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator.hasNext();) { java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next(); csvFileOutputStream .write(""" + (String) propertyEntry.getValue() != null ? (String) propertyEntry .getValue() : "" + """); if (propertyIterator.hasNext()) { csvFileOutputStream.write(","); } } csvFileOutputStream.newLine(); // 写入文件内容 for (Iterator iterator = exportData.iterator(); iterator.hasNext();) { Object row = (Object) iterator.next(); for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator .hasNext();) { java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator .next(); csvFileOutputStream.write((String) BeanUtils.getProperty(row, (String) propertyEntry.getKey())); if (propertyIterator.hasNext()) { csvFileOutputStream.write(","); } } if (iterator.hasNext()) { csvFileOutputStream.newLine(); } } csvFileOutputStream.flush(); } catch (Exception e) { e.printstacktrace(); } finally { try { csvFileOutputStream.close(); } catch (IOException e) { e.printstacktrace(); } } return csvFile; } /** * 下载文件 * @param response * @param csvFilePath * 文件路径 * @param fileName * 文件名称 * @throws IOException */ public static void exportFile(HttpServletResponse response, String csvFilePath, String fileName) throws IOException { response.setContentType("application/csv;charset=UTF-8"); response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode(fileName, "UTF-8")); InputStream in = null; try { in = new FileInputStream(csvFilePath); int len = 0; byte[] buffer = new byte[1024]; response.setCharacterEncoding("UTF-8"); OutputStream out = response.getoutputStream(); while ((len = in.read(buffer)) > 0) { out.write(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF }); out.write(buffer, 0, len); } } catch (FileNotFoundException e) { System.out.println(e); } finally { if (in != null) { try { in.close(); } catch (Exception e) { throw new RuntimeException(e); } } } } /** * 删除该目录filePath下的所有文件 * @param filePath * 文件目录路径 */ public static void deleteFiles(String filePath) { File file = new File(filePath); if (file.exists()) { File[] files = file.listFiles(); for (int i = 0; i (); Map row1 = new LinkedHashMap(); row1.put("1", "11"); row1.put("2", "12"); row1.put("3", "13"); row1.put("4", "14"); exportData.add(row1); row1 = new LinkedHashMap(); row1.put("1", "21"); row1.put("2", "22"); row1.put("3", "23"); row1.put("4", "24"); exportData.add(row1); LinkedHashMap map = new LinkedHashMap(); map.put("1", "第一列"); map.put("2", "第二列"); map.put("3", "第三列"); map.put("4", "第四列"); String path = "c:/export/"; String fileName = "文件导出"; File file = CSVUtils.createCSVFile(exportData, map, path, fileName); String fileName2 = file.getName(); System.out.println("文件名称：" + fileName上一篇：java编程实现杨辉三角两种输出结果实例代码下一篇：Java实现数独小游戏热门搜索：