JAVA list转csv不含表头和含表头

maven依赖：

	 <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-csv</artifactId>
            <version>1.6</version>
     </dependency>

不含表头

 /**
     * 写入data到csv文件，不含表头
     * 文件名必须为csv结尾
     * @param data List
     * @param targetCSVFileName 文件名必须以csv结尾 例如*.csv
     * @return file
     */
    public static File writeCsv(List<Object[]> data, String targetCSVFileName) {
        //初始化csvformat
        CSVFormat format = CSVFormat.DEFAULT.withIgnoreHeaderCase();
        CSVPrinter printer = null;
        try {
            File f = new File(targetCSVFileName);
            //根据路径创建文件，并设置编码格式
            FileOutputStream fos = new FileOutputStream(f);
            OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
            //创建CSVPrinter对象
            printer = new CSVPrinter(osw, format);
            if (data != null) {
                //循环写入数据
                for (Object[] lineData : data) {
                    printer.printRecord(lineData);
                }
            }
            printer.flush();
            return f;
        } catch (IOException e) {
            e.printStackTrace();
            logger.error("writeToCsvException", e);
        } finally {
            if (printer != null) {
                try {
                    printer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

测试：

ublic static void main(String[] args) {
        List<Object[]>  data = new ArrayList<>();
        for(int i = 0; i<10; i++){
            Object[] arr = new Object[4];
            arr[0] = "VIRTUAL" + i;
            arr[1] = 0.6666;
            arr[2] = 160.00;
            arr[3] = "2020-06-13";
            data.add(arr);
        }
        writeCsv(data, UUID.randomUUID().toString() + ".csv");
    }

生成文件格式：

java list转csv文件，文件在对应项目根目录下

## 含有表头：

//含有表头，文件名要以csv结尾
public static File writeCsvWithHeads(String[] headers, List<Object[]> data, String targetCSVFileName) {
        //初始化csvformat
        CSVFormat format = CSVFormat.DEFAULT.withHeader(headers);
        CSVPrinter printer = null;
        try {
            File f = new File(targetCSVFileName);
            //根据路径创建文件，并设置编码格式
            FileOutputStream fos = new FileOutputStream(f);
            OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
            //创建CSVPrinter对象
            printer = new CSVPrinter(osw, format);
            if (data != null) {
                //循环写入数据
                for (Object[] lineData : data) {
                    printer.printRecord(lineData);
                }
            }
            printer.flush();
            return f;
        } catch (IOException e) {
            e.printStackTrace();
            logger.error("xxx" + "writeToCsvException", e);
        } finally {
            if (printer != null) {
                try {
                    printer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

测试：

public static void main(String[] args) {
        List<Object[]>  data = new ArrayList<>();
        for(int i = 0; i<10; i++){
            Object[] arr = new Object[4];
            arr[0] = "VIRTUAL" + i;
            arr[1] = 0.6666;
            arr[2] = 160.00;
            arr[3] = "2020-06-13";
            data.add(arr);
        }
        String[] headers = new String[4];
        headers[0] = "字符串";
        headers[1] = "小数";
        headers[2] = "小数1";
        headers[3] = "日期";
        writeCsvWithHeads(headers, data, UUID.randomUUID().toString() + ".csv");
    }

测试结果：