java csv文件上传示例 java处理csv文件上传示例详解

时间:2021-01-28 齐华枫人气:0

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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