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 < files.length; i++) { if (files[i].isFile()) { files[i].delete(); } } } } /** * 删除单个文件 * @param filePath * 文件目录路径 * @param fileName * 文件名称 */ public static void deleteFile(String filePath, String fileName) { File file = new File(filePath); if (file.exists()) { File[] files = file.listFiles(); for (int i = 0; i < files.length; i++) { if (files[i].isFile()) { if (files[i].getName().equals(fileName)) { files[i].delete(); return; } } } } } /** * 测试数据 * @param args */ @SuppressWarnings({ "rawtypes", "unchecked" }) public static void main(String[] args) { List exportData = new ArrayList<Map>(); Map row1 = new LinkedHashMap<String, String>(); row1.put("1", "11"); row1.put("2", "12"); row1.put("3", "13"); row1.put("4", "14"); exportData.add(row1); row1 = new LinkedHashMap<String, String>(); 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：" + fileName2); }}

2、调用createCSVFile方法生成CSV文件

String name = "银行退款数据";List exportData = new ArrayList();LinkedHashMap datamMap = null;for (Iterator iterator = refundList.iterator(); iterator.hasNext();) { HashMap map = (HashMap) iterator.next(); datamMap = new LinkedHashMap(); datamMap.put("1", map.get("merOrderId")); datamMap.put("2",DateUtil.convertDateToString("yyyyMMdd", (Date) map.get("orderTime"))); BigDecimal amount = (BigDecimal) map.get("amount"); String amountString = amount.divide(new BigDecimal(10)).toPlainString(); datamMap.put("3", amountString); datamMap.put("4", map.get("remark") != null ? map.get("remark") : ""); exportData.add(datamMap);} LinkedHashMap map = new LinkedHashMap(); map.put("1", "订单号"); map.put("2", "支付日期"); map.put("3", "退货现金金额（整数金额 单位：分）"); map.put("4", "退货原因"); File file = CSVUtils.createCSVFile(exportData, map, filePath, name);//生成CSV文件 fileName = file.getName(); CSVUtils.exportFile(response, filePath + fileName, fileName);//下载生成的CSV文件