java处理csv文件上传示例详解
前言:示例只是做了一个最最基础的上传csv的示例,如果要引用到代码中去,还需要根据自己的业务自行添加一些逻辑处理。
ReadCsvUtil工具类
package com.hanfengyeqiao.gjb.utils; import java.io.*; import java.util.*; /** * csv工具类 */ public class ReadCsvUtil { private static final String FIX="\uFEFF"; /** * 获取csv文件内容 * @return 对象list */ public static List<Map<String,Object>> getResource(byte[] bate) throws IOException { List<Map<String,Object>> allString = new ArrayList(); Map<String,Object> callLogInfo ; List<String> list = new ArrayList(); // 获取文件内容 list = getSource(bate); // 获取文件表头 List<String> title = Arrays.asList(list.get(0).split(",")); String customerName = title.get(0).trim(); String customerNo = title.get(1).trim(); // 头部会带有"\uFEFF"值 if(customerName.startsWith(FIX)){ customerName = customerName.replace(FIX, ""); } callLogInfo = new HashMap(); callLogInfo.put("param1",customerName); callLogInfo.put("param2",customerNo); allString.add(callLogInfo); list.remove(0); // 循环内容 for(int i = 0; i<list.size();i++){ List<String> content = Arrays.asList(list.get(i).split(",")); // 当没有添加额外参数时 if(content!=null){ callLogInfo = new HashMap(); callLogInfo.put("param1",content.get(0)); callLogInfo.put("param2",content.get(1)); allString.add(callLogInfo); } } return allString; } /** * 读文件数据 */ public static List<String> getSource(byte[] bate) throws IOException { BufferedReader br = null; ByteArrayInputStream fis=null; InputStreamReader isr = null; try { fis = new ByteArrayInputStream(bate); //指定以UTF-8编码读入 isr = new InputStreamReader(fis,"UTF-8"); br = new BufferedReader(isr); } catch (Exception e) { e.printStackTrace(); } String line; String everyLine ; List<String> allString = new ArrayList<>(); try { //读取到的内容给line变量 while ((line = br.readLine()) != null){ everyLine = line; allString.add(everyLine); } } catch (IOException e) { e.printStackTrace(); }finally { if(fis != null){ fis.close(); } if(isr != null){ isr.close(); } } return allString; } }
控制器(这里用的springboot):
package com.hanfengyeqiao.gjb.controller.admin; import com.hanfengyeqiao.gjb.utils.ReadCsvUtil; import io.swagger.annotations.Api; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.util.List; import java.util.Map; @Api(tags = "") @RestController @RequestMapping("/admin") public class AdminCertController { @RequestMapping("/test/upload") public void upload(HttpServletRequest request, MultipartFile upfile) throws Exception { if (request.getMethod().equals("POST")) { byte[] bate =upfile.getBytes(); List<Map<String,Object>> list=ReadCsvUtil.getResource(bate); if(list!=null){ for(Map<String,Object> m:list){ System.out.println("param1:"+m.get("param1")+";param2:"+m.get("param2")+"。"); } } } } }
html代码:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>test</title> </head> <body> <form action="http://localhost:8088/admin/test/upload" method="post" enctype="multipart/form-data"> 上传:<input type="file" name="upfile"/> <input type="submit" value="提交"/> </form> </body> <script type="text/javascript"> </script> </html>
示例文件
运行结果
在处理csv文件的时候容易出现编码上的问题,小伙伴们写代码的时候要多注意一下!
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