调用createFile如:createFile(“D:\test.csv”);即可在D盘下创建了test.csv文件。 2、写入数据到文件 csv文件写入特性,以字符写入用英文逗号(”,“)分隔即是单元格分离,如写入数据为"test11,test22,test33,test44,test55”,得到的文件是以”,"分隔的单元格数据: 代码实现: public static boolean writeDataTo...
bw.write("value1,value2\n"); bw.close(); 三、使用Java NIO 对于大文件的处理,可以考虑使用Java的NIO库,它提供了更高的处理效率。 1. 读取CSV文件 使用Files类和Paths类结合Stream API,可以方便地读取CSV文件: Stream<String> lines = Files.lines(Paths.get("path/to/csv")); lines.forEach(line -...
String filePath1 = "D:\\myfile\\employee1.csv"; List<String> dataList = getCsvDataList(); long writeDataListToCsvTime = System.currentTimeMillis(); writeDataListToCsv(head, dataList, filePath1, true); System.out.println("writeDataListToCsvTime : " + (System.currentTimeMillis() - ...
println("Data has been written to " + csvFile); } catch (IOException e) { e.printStackTrace(); } } } 复制代码 在上述代码中,首先创建一个FileWriter对象来写入文件。然后,利用BufferedWriter类提供的write和newLine方法将数据逐行写入CSV文件。最后,关闭BufferedWriter和FileWriter对象。 运行代码后,数据将被...
public static void writeCSV(List<T> dataList, String finalPath) { try { Writer writer = new FileWriter(finalPath); writer.write(new String(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF })); StatefulBeanToCsv beanToCsv = new StatefulBeanToCsvBuilder(writer).withQuotechar(CSV...
CSVUtils.writeToCSV(data); CSVUtils.readFromCSV("test.csv"); }catch(Exception e) { e.printStackTrace(); } } } 2、可以将sql查询出来的ResultSet直接写入csv文件 publicstaticvoidqueryOnConsole(String account, String sql){ Connection conn=null; ...
写入CSV文件 代码语言:txt 复制 import com.opencsv.CSVWriter; import java.io.FileWriter; import java.io.IOException; public class WriteCSV { public static void main(String[] args) { String csvFile = "path/to/your/output.csv"; try (CSVWriter writer = new CSVWriter(new FileWriter(csvFile))...
// Write data to CSV file FileWriter writer = new FileWriter("mydata.csv"); while (rs.next()) { for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) { writer.append(rs.getString(i)); if (i != rs.getMetaData().getColumnCount()) { writer.append(","); } } wr...
String.valueOf(i); // 写入行 csvWriter.writeRecord((String[]) Arrays.asList(orderNum, userName, payMoney).toArray()); } } catch (Exception e) { e.printStackTrace(); } finally { csvWriter.close(); } } public static void main(String[] args) { writeCsvFile(WRITE_CSV_FILE_PATH);...
csvWriter.writeRecord((String[]) Arrays.asList(orderNum, userName, payMoney).toArray()); } } catch (Exception e) { e.printStackTrace(); } finally { csvWriter.close(); } } public static void main(String[] args) { writeCsvFile(WRITE_CSV_FILE_PATH); ...