java将数据写入csv文件，从csv文件中读取数据

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java将数据写入csv文件，从csv文件中读取数据

测试代码

      public static void main(String[] arges){
          //自定义数组
          ArrayListString>> alldata=new ArrayListString>>();
          alldata.add(new ArrayList<String>(Arrays.asList("1","11","111")));  //添加一行
          alldata.add(new ArrayList<String>(Arrays.asList("2","22","222")));  //添加一行
          alldata.add(new ArrayList<String>(Arrays.asList("3","33","333")));  //添加一行
          //保存成csv文件
          Array2CSV(alldata,"test.csv");
          //读取csv文件
          ArrayListString>> alldata1=CSV2Array("test.csv");
          //遍历数组
          for (ArrayList<String> arrayList : alldata1) {
                for (String string : arrayList) {
                    System.out.println(string);
                }
          }
      }

将数据写入csv文件

//导出到csv文件
      public static void Array2CSV(ArrayList> data, String path)
      {
          try {
                BufferedWriter out =new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path),"UTF-8"));         
                for (int i = 0; i < data.size(); i++)
                {
                    ArrayList onerow=data.get(i);
                    for (int j = 0; j < onerow.size(); j++)
                    {
                        out.write(DelQuota(onerow.get(j)));
                        out.write(",");
                    }
                    out.newLine();
                }
                out.flush();
                out.close();

            } catch (Exception e) {
                e.printStackTrace();
            }

      }
      public static String DelQuota(String str)
      {
          String result = str;
          String[] strQuota = { "~", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "`", ";", "'", ",", ".", "/", ":", "/,", "<", ">", "?" };
          for (int i = 0; i < strQuota.length; i++)
          {
              if (result.indexOf(strQuota[i]) > -1)
                  result = result.replace(strQuota[i], "");
          }
          return result;
      }

从csv文件中读取数据

 public static ArrayListString>> CSV2Array(String path)
      {
          try {
                BufferedReader in =new BufferedReader(new InputStreamReader(new FileInputStream(path),"UTF-8"));
                ArrayListString>> alldata=new ArrayListString>>();
                String line;
                String[] onerow;
                while ((line=in.readLine())!=null) {
                     onerow = line.split(",");  //默认分割符为逗号，可以不使用逗号
                     List<String> onerowlist = Arrays.asList(onerow);
                     ArrayList<String> onerowaArrayList = new ArrayList<String>(onerowlist);
                     alldata.add(onerowaArrayList);
                }
                in.close();
                return alldata;
            } catch (Exception e) {
                return null;
            }

      }