JAVA导出CSV文件实例教程

@Test public void testWrite() throws Exception {
  FileOutputStream fos = new FileOutputStream("E:/cjsworkspace/cjs-excel-demo/target/abc.csv");
  OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK");

  CSVFormat csvFormat = CSVFormat.DEFAULT.withHeader("姓名", "年龄", "家乡");
  CSVPrinter csvPrinter = new CSVPrinter(osw, csvFormat);//  csvPrinter = CSVFormat.DEFAULT.withHeader("姓名", "年龄", "家乡").print(osw);

  for (int i = 0; i <10; i++) {
   csvPrinter.printRecord("张三", 20, "湖北");
  }

  csvPrinter.flush();
  csvPrinter.close();

 }

 @Test public void testRead() throws IOException {
  InputStream is = new FileInputStream("E:/cjsworkspace/cjs-excel-demo/target/abc.csv");
  InputStreamReader isr = new InputStreamReader(is, "GBK");
  Reader reader = new BufferedReader(isr);

  CSVParser parser = CSVFormat.EXCEL.withHeader("name", "age", "jia").parse(reader);//  CSVParser csvParser = CSVParser.parse(reader, CSVFormat.DEFAULT.withHeader("name", "age", "jia"));
  List list = parser.getRecords();  for (CSVRecord record : list) {
   System.out.println(record.getRecordNumber()     + ":" + record.get("name")     + ":" + record.get("age")     + ":" + record.get("jia"));
  }

  parser.close();
 } /**
  * Parsing an Excel CSV File  */
 @Test public void testParse() throws Exception {
  Reader reader = new FileReader("C:/Users/Administrator/Desktop/abc.csv");
  CSVParser parser = CSVFormat.EXCEL.parse(reader);  for (CSVRecord record : parser.getRecords()) {
   System.out.println(record);
  }
  parser.close();
 } /**
  * Defining a header manually  */
 @Test public void testParseWithHeader() throws Exception {
  Reader reader = new FileReader("C:/Users/Administrator/Desktop/abc.csv");
  CSVParser parser = CSVFormat.EXCEL.withHeader("id", "name", "code").parse(reader);  for (CSVRecord record : parser.getRecords()) {
   System.out.println(record.get("id") + ","
     + record.get("name") + ","
     + record.get("code"));
  }
  parser.close();
 } /**
  * Using an enum to define a header  */
 enum MyHeaderEnum {
  ID, NAME, CODE;
 }

 @Test public void testParseWithEnum() throws Exception {
  Reader reader = new FileReader("C:/Users/Administrator/Desktop/abc.csv");
  CSVParser parser = CSVFormat.EXCEL.withHeader(MyHeaderEnum.class).parse(reader);  for (CSVRecord record : parser.getRecords()) {
   System.out.println(record.get(MyHeaderEnum.ID) + ","
     + record.get(MyHeaderEnum.NAME) + ","
     + record.get(MyHeaderEnum.CODE));
  }
  parser.close();
 } private List> recordList = new ArrayList<>();

 @Before public void init() {  for (int i = 0; i <5; i++) {
   Map map = new HashMap<>();
   map.put("name", "zhangsan");
   map.put("code", "001");
   recordList.add(map);
  }
 }

 @Test public void writeMuti() throws InterruptedException {
  ExecutorService executorService = Executors.newFixedThreadPool(3);
  CountDownLatch dOneSignal= new CountDownLatch(2);

  executorService.submit(new exprotThread("E:/0.csv", recordList, doneSignal));
  executorService.submit(new exprotThread("E:/1.csv", recordList, doneSignal));

  doneSignal.await();
  System.out.println("Finish!!!");
 } class exprotThread implements Runnable {  private String filename;  private List> list;  private CountDownLatch countDownLatch;  public exprotThread(String filename, List> list, CountDownLatch countDownLatch) {   this.filename = filename;   this.list = list;   this.countDownLatch = countDownLatch;
  }

  @Override  public void run() {   try {
    CSVPrinter printer = new CSVPrinter(new FileWriter(filename), CSVFormat.EXCEL.withHeader("NAME", "CODE"));    for (Map map : list) {
     printer.printRecord(map.values());
    }
    printer.close();
    countDownLatch.countDown();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }

　　/**
  * 测试写100万数据需要花费多长时间  */
 @Test public void testMillion() throws Exception {  int times = 10000 * 10;
  Object[] cells = {"满100减15元", "100011", 15};  // 导出为CSV文件
  long t1 = System.currentTimeMillis();
  FileWriter writer = new FileWriter("G:/test1.csv");
  CSVPrinter printer = CSVFormat.EXCEL.print(writer);  for (int i = 0; i 

 
  org.apache.commons
  commons-csv
  1.5
 

 
  org.apache.poi
  poi
  3.17
 

 
  org.apache.poi
  poi-ooxml
  3.17
 


 
  junit
  junit
  4.12
  test