java中怎么实现CSV文件导入导出功能，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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导入部分
导入的时候基于Ajax请求，js代码如下：
function importIpMac(upload) { var importTextInfo = document.getElementById("importTextInfo"); importTextInfo.value=""; $.ajaxFileUpload({ url: ctx + "/ipmac/importIpMac", type: 'post', secureuri: false, // 一般设置为false fileElementId: 'upload', // 上传文件的id、name属性名 dataType: 'text', // 返回值类型，一般设置为json、application/json success: function(data, status){ getIpMacBase(); }, error: function(data, status, e){ alert('请求异常!'); } });}
Java代码控制层：
/** * 导入 */ @ResponseBody @RequestMapping(value = "/importIpMac", method = RequestMethod.POST, headers = { "content-type=multipart/form-data" }) public int importIpMac(HttpServletRequest request, HttpServletResponse response, @RequestParam(value = "upload") MultipartFile[] buildInfo) throws ServletException, IOException { // 得到上传文件的保存目录，将上传的文件存放于WEB-INF目录下，不允许外界直接访问，保证上传文件的安全 String savePath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload"); savePath = savePath.replace("file:", ""); // 去掉file: File file1 = new File(savePath); // 判断上传文件的保存目录是否存在 if (!file1.exists() && !file1.isDirectory()) { log.info(savePath + "目录不存在，需要创建"); file1.mkdir(); } // 删除此路径下的所有文件以及文件夹 delAllFile(savePath); try { InputStream is = buildInfo[0].getInputStream();// 多文件也适用,我这里就一个文件 byte[] b = new byte[(int) buildInfo[0].getSize()]; int read = 0; int i = 0; while ((read = is.read()) != -1) { b[i] = (byte) read; i++; } is.close(); String filePath = savePath + "/" + "temp" + "_" + buildInfo[0].getOriginalFilename(); log.info("临时文件保存路径：" + savePath + "/" + "temp" + "_" + buildInfo[0].getOriginalFilename()); OutputStream os = new FileOutputStream(new File(savePath + "/" + "temp" + "_" + buildInfo[0].getOriginalFilename()));// 文件原名,如a.txt os.write(b); os.flush(); os.close(); topologyIpMacPortRealService.importIpMac(filePath); } catch (Exception e) { if (log.isDebugEnabled()) log.debug("系统异常", e); } return 1; }
Java代码实现层：
public int importIpMac(String filePath) throws Exception { // List dataList=CSVUtils.importCsv(new File("/Users/wjm/Desktop/testexcel.csv")); List dataList = CSVUtils.importCsv(new File(filePath)); if (dataList != null && !dataList.isEmpty()) { for (int i = 1; i < dataList.size(); i++) { String data = dataList.get(i); SiTopologyIpMacPortBase base = new SiTopologyIpMacPortBase(); String[] source = data.split(","); if (source[0] != "") { base.setId(source[0]); base.setMac(source[1]); base.setIp(source[2]); base.setUpIp(source[3]); base.setUpName(source[4]); base.setUpIndex(source[5]); base.setModifyTime(source[6]); siTopologyIpMacPortBaseDao.insert(base); } } } return 1; }
其中CSVUtils类：
package com.one.si.toimpl.common.utils; import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileOutputStream;import java.io.FileReader;import java.io.IOException;import java.io.OutputStreamWriter;import java.util.ArrayList;import java.util.List; /** * CSV操作(导出和导入) * * @author wjm * @version 1.0 Nov 24, 2015 4:30:58 PM */public class CSVUtils { /** * 导出 * * @param file csv文件(路径+文件名)，csv文件不存在会自动创建 * @param dataList 数据 * @return */ public static boolean exportCsv(File file, List dataList){ boolean isSucess=false; FileOutputStream out=null; OutputStreamWriter osw=null; BufferedWriter bw=null; try {// OutputStreamWriter in_=new OutputStreamWriter(new FileOutputStream("文件名"), "gbk"); out = new FileOutputStream(file); osw = new OutputStreamWriter(out, "gbk"); bw =new BufferedWriter(osw); if(dataList!=null && !dataList.isEmpty()){ for(String data : dataList){ bw.append(data).append("\r"); } } isSucess=true; } catch (Exception e) { isSucess=false; }finally{ if(bw!=null){ try { bw.close(); bw=null; } catch (IOException e) { e.printStackTrace(); } } if(osw!=null){ try { osw.close(); osw=null; } catch (IOException e) { e.printStackTrace(); } } if(out!=null){ try { out.close(); out=null; } catch (IOException e) { e.printStackTrace(); } } } return isSucess; } /** * 导入 * * @param file csv文件(路径+文件) * @return */ public static List importCsv(File file){ List dataList=new ArrayList(); BufferedReader br=null; try { br = new BufferedReader(new FileReader(file)); String line = ""; while ((line = br.readLine()) != null) { dataList.add(line); } }catch (Exception e) { }finally{ if(br!=null){ try { br.close(); br=null; } catch (IOException e) { e.printStackTrace(); } } } return dataList; }}
导出部分
js部分：
/* * 导出基准表中的数据 */function exportIpMac() { window.open("exportIpMac.do");}
Java代码控制层：
/** * 导出的基准表信息 */ @ResponseBody @RequestMapping("/exportIpMac") public String exportIpMac(HttpServletRequest request, HttpServletResponse response) throws Exception { List dataList = topologyIpMacPortRealService.exportIpMac(); response.setCharacterEncoding("GBK"); SimpleDateFormat dfs = new SimpleDateFormat("yyyyMMddHHmmss");// 设置日期格式 Date time = new Date(); String tStamp = dfs.format(time); String filename = "IpMacPortExport"+tStamp + ".csv"; response.setHeader("contentType", "text/html; charset=GBK"); response.setContentType("application/octet-stream"); response.addHeader("Content-Disposition", "attachment; filename="+filename); String cp=request.getSession().getServletContext().getRealPath("/"); String path = cp+"download/"+filename; File file = new File(path); BufferedInputStream bis = null; BufferedOutputStream out = null; FileWriterWithEncoding fwwe =new FileWriterWithEncoding(file,"GBK"); BufferedWriter bw = new BufferedWriter(fwwe); if(dataList!=null && !dataList.isEmpty()){ for(String data : dataList){ bw.write(data); bw.write("\n"); } } bw.close(); fwwe.close(); try { bis = new BufferedInputStream(new FileInputStream(file)); out = new BufferedOutputStream(response.getOutputStream()); byte[] buff = new byte[2048]; while (true) { int bytesRead; if (-1 == (bytesRead = bis.read(buff, 0, buff.length))){ break; } out.write(buff, 0, bytesRead); } file.deleteOnExit(); } catch (IOException e) { throw e; } finally{ try { if(bis != null){ bis.close(); } if(out != null){ out.flush(); out.close(); } } catch (IOException e) { throw e; } } delAllFile(cp+"download/"); return null; }
Java代码实现层：
public List exportIpMac() throws Exception { List dataList = new ArrayList(); try { List list = siTopologyIpMacPortRealdao.selectAllData(); dataList.add("ID,地址,IP地址,设备,设备名称,端口,更新时间"); for (int i = 0; i < list.size(); i++) { dataList.add(list.get(i).getId() + "," + list.get(i).getMac() + "," + list.get(i).getIp() + "," + list.get(i).getUpIp() + "," + list.get(i).getUpName() + "," + list.get(i).getUpIfIndex() + "," + list.get(i).getModifyTime()); } } catch (Exception e) { e.printStackTrace(); } return dataList; }
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