java 导出excel表格（.scv）
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//对于大数据量的导出，导出csv格式比较快 jsp 页面首先需要引入jquery.redirect.js<button onclick="exportExcel();">导出</button> js页面 function exportExcel(){var param = {"userId":userId};$.redirect(path+ '/exportExcel.action',param);} 后台： public class BjUserVO { private String username; private String sex ; private String age; private String department;// 单位 private String part;// 部门 } //需要注意的是headers 里面的字段的先后顺序要和BjUserVO里面的先后顺序保持一致 public void exportExcel() throws Exception { List<Object> headList = new ArrayList<Object>(); SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmss"); List<BjUserVO> dataList = queryUserService.queryUserByCondition(userId);String time = sdf.format(new Date());String downloadFilePath = "xmgl" + File.separator + "download"+File.separator;String fileName = time+"_人员信息表"; Object[] headers = {"姓名","性别","年龄","单位","部门"};headList = Arrays.asList(headers);CSVUtils<BjUserVO> cs = new CSVUtils<BjUserVO>();File file = cs.createCSVFileVo3(headList, dataList, downloadFilePath, fileName);try {FileUploadUtil.processFileDownloadAttach(file.getPath(), file.getName());} catch (UnsupportedEncodingException e) {e.printStackTrace();}} //下面是导出的共用的模板(要是有样式的不统一的话就需要根据需求做相应的变化)//处理文件上传的工具类和导出csv格式的工具类可以拿出来共用 package com.bjygsoft.xmgl.util;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.lang.reflect.Field;import java.lang.reflect.Method;import java.net.URLEncoder;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import javax.servlet.http.HttpServletResponse;/** * 导出csv格式工具类 */public class CSVUtils<T> { /** CSV文件列分隔符 */ private static final String CSV_COLUMN_SEPARATOR = ","; /** CSV文件列分隔符 */ private static final String CSV_RN = "\r\n"; /** * CSV文件生成方法 * @param head * @param dataList * @param outPutPath * @param filename * @return */ public static File createCSVFile(List<Object> head, List<List<Object>> dataList,String outPutPath, String filename) { File csvFile = null; BufferedWriter csvWtriter = null; try { csvFile = new File(outPutPath + File.separator + filename + ".csv"); File parent = csvFile.getParentFile(); if (parent != null && !parent.exists()) { parent.mkdirs(); } csvFile.createNewFile(); // GB2312使正确读取分隔符"," csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "GB2312"), 1024); // 写入文件头部 writeRow(head, csvWtriter); // 写入文件内容 for (List<Object> row : dataList) { writeRow(row, csvWtriter); } csvWtriter.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { csvWtriter.close(); } catch (IOException e) { e.printStackTrace(); } } return csvFile; } /** * CSV文件生成方法 * @param head * @param dataList * @param outPutPath * @param filename * @return */ public File createCSVFileVo(List<Object> head, List dataList,String outPutPath, String filename, List<Object> footer) { File csvFile = null; BufferedWriter csvWtriter = null; try { csvFile = new File(outPutPath + File.separator + filename + ".csv"); File parent = csvFile.getParentFile(); if (parent != null && !parent.exists()) { parent.mkdirs(); } csvFile.createNewFile(); // GB2312使正确读取分隔符"," csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "GB2312"), 1024); // 写入文件头部 writeRow(head, csvWtriter); Iterator<T> it = (Iterator<T>) dataList.iterator(); while (it.hasNext()) { T t = (T) it.next(); // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值 Field[] fields = t.getClass().getDeclaredFields(); List<Object> row = new ArrayList<Object>();; for(int i=0; i<head.size(); i++){ String fieldName = fields[i].getName(); String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); Class tCls = t.getClass(); Method getMethod = tCls.getMethod(getMethodName, new Class[] {}); Object value = getMethod.invoke(t, new Object[] {}); row.add(value); } writeRow2(row, csvWtriter); } // 写入文件头部 writeRow(footer, csvWtriter); csvWtriter.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { csvWtriter.close(); } catch (IOException e) { e.printStackTrace(); } } return csvFile; } /** * 写一行数据方法 * @param row * @param csvWriter * @throws IOException */ private static void writeRow(List<Object> row, BufferedWriter csvWriter) throws IOException { // 写入文件头部 for (Object data : row) { StringBuffer buf = new StringBuffer(); String rowStr = buf.append("").append(data).append(",").toString(); csvWriter.write(rowStr); } csvWriter.newLine(); } /** * 写一行数据方法 * @param row * @param csvWriter * @throws IOException */ private void writeRow2(List<Object> row, BufferedWriter csvWriter) throws IOException { // 写入文件头部 for (Object obj : row) { StringBuffer buf = new StringBuffer(); String rowStr = buf.append("").append(obj).append(",").toString(); csvWriter.write(rowStr); } csvWriter.newLine(); }public File createCSVFileVo2(List<Object> head, List dataList,String outPutPath, String filename, List<Object> footer, List<Object> head2) {File csvFile = null; BufferedWriter csvWtriter = null; try { csvFile = new File(outPutPath + File.separator + filename + ".csv"); File parent = csvFile.getParentFile(); if (parent != null && !parent.exists()) { parent.mkdirs(); } csvFile.createNewFile(); // GB2312使正确读取分隔符"," csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "GB2312"), 1024); // 写入文件头部 writeRow(head, csvWtriter); writeRow(head2, csvWtriter); Iterator<T> it = (Iterator<T>) dataList.iterator(); while (it.hasNext()) { T t = (T) it.next(); // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值 Field[] fields = t.getClass().getDeclaredFields(); List<Object> row = new ArrayList<Object>();; for(int i=0; i<head.size(); i++){ String fieldName = fields[i].getName(); String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); Class tCls = t.getClass(); Method getMethod = tCls.getMethod(getMethodName, new Class[] {}); Object value = getMethod.invoke(t, new Object[] {}); row.add(value); } writeRow2(row, csvWtriter); } // 写入文件头部 writeRow(footer, csvWtriter); csvWtriter.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { csvWtriter.close(); } catch (IOException e) { e.printStackTrace(); } } return csvFile;}/** * CSV文件生成方法 * @param head * @param dataList * @param outPutPath * @param filename * @return */ public File createCSVFileVo3(List<Object> head, List dataList,String outPutPath, String filename) { File csvFile = null; BufferedWriter csvWtriter = null; try { csvFile = new File(outPutPath + File.separator + filename + ".csv"); File parent = csvFile.getParentFile(); if (parent != null && !parent.exists()) { parent.mkdirs(); } csvFile.createNewFile(); // GB2312使正确读取分隔符"," csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "GB2312"), 1024); // 写入文件头部 writeRow(head, csvWtriter); Iterator<T> it = (Iterator<T>) dataList.iterator(); while (it.hasNext()) { T t = (T) it.next(); // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值 Field[] fields = t.getClass().getDeclaredFields(); List<Object> row = new ArrayList<Object>();; for(int i=0; i<head.size(); i++){ String fieldName = fields[i].getName(); String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); Class tCls = t.getClass(); Method getMethod = tCls.getMethod(getMethodName, new Class[] {}); Object value = getMethod.invoke(t, new Object[] {}); row.add(value); } writeRow2(row, csvWtriter); } csvWtriter.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { csvWtriter.close(); } catch (IOException e) { e.printStackTrace(); } } return csvFile; }public static File createCSVFile2(List<Object> head, List<List<Object>> dataList,String outPutPath, String filename,List<Object> headList2) { File csvFile = null; BufferedWriter csvWtriter = null; try { csvFile = new File(outPutPath + File.separator + filename + ".csv"); File parent = csvFile.getParentFile(); if (parent != null && !parent.exists()) { parent.mkdirs(); } csvFile.createNewFile(); // GB2312使正确读取分隔符"," csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "GB2312"), 1024); // 写入文件头部 writeRow(head, csvWtriter); writeRow(headList2, csvWtriter); // 写入文件内容 for (List<Object> row : dataList) { writeRow(row, csvWtriter); } csvWtriter.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { csvWtriter.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); } } } } }package com.bjygsoft.xmgl.util;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import org.apache.log4j.Logger;import org.apache.struts2.ServletActionContext;/** * @Title: FileUploadUtil * @Description: 处理上传的附件*/public class FileUploadUtil {private static Logger logger = Logger.getLogger(FileUploadUtil.class);//系统日志记录public static void uploadFile(File file,String fileFileName,String path){//DateUtil dateUtil = new DateUtil();try { fileFileName = fileFileName.replace("&", "");File f = new File(path);// 如果文件夹不存在则创建if (!f.exists() && !f.isDirectory()) {f.mkdirs();}InputStream is = new FileInputStream(file);OutputStream os = new FileOutputStream(new File(path, fileFileName));// 因为file是存放在临时文件夹的文件，我们可以将其文件名和文件路径打印出来，看和之前的fileFileName是否相同logger.info("[上传附件公用类]fileFileName: " + fileFileName);logger.info("[上传附件公用类]文件路径: " + path);byte[] buffer = new byte[1024];int length = 0;while (-1 != (length = is.read(buffer, 0, buffer.length))) {os.write(buffer,0,length);}os.close();is.close();} catch (Exception e) {e.printStackTrace();}}/** * 处理文件下载 * * @param filePath * @param fileName * @throws UnsupportedEncodingException */public static void processFileDownloadAttach(String filePath, String fileName) throws UnsupportedEncodingException {HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/html;charset=UTF-8");response.setContentType("application/x-msdownload;charset=UTF-8");response.setHeader("Content-Disposition","attachment; filename=" + new String(fileName.getBytes("gbk"), "ISO8859_1"));downLoadCopy(filePath);}/** * 下载文件拷贝 * * @param filePath */private static void downLoadCopy(String filePath) {HttpServletResponse response = ServletActionContext.getResponse();File file = new File(filePath);int fileLength = (int) file.length();response.setContentLength(fileLength);/* 如果文件长度大于0 */if (fileLength != 0) {/* 创建输入流 */InputStream inStream = null;/* 创建输出流 */ServletOutputStream servletOS = null;try {inStream = new FileInputStream(file);byte[] buf = new byte[4096];servletOS = response.getOutputStream();int readLength;while (((readLength = inStream.read(buf, 0, buf.length)) != -1)) {servletOS.write(buf, 0, readLength);}} catch (Exception e) {e.printStackTrace();} finally {try {inStream.close();servletOS.flush();servletOS.close();} catch (Exception e) {e.printStackTrace();}}}}}阅读全文
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