使用commons-csv生成.csv文件

来源：互联网发布：linux下查看cpu使用率编辑：程序博客网时间：2024/06/13 02:17

原文链接：https://my.oschina.net/liuchunhui/blog/478520

做个代码笔记，方便以后看。

commons-csv-1.1.jar的源码：https://github.com/apache/commons-csv

CsvFileBuilder.java类

package com.huihui.main;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.util.ArrayList;import java.util.List;import java.util.Map;import java.util.Set;import org.apache.commons.csv.CSVFormat;import org.apache.commons.csv.CSVPrinter;public class CsvFileBuilder {private static final String[] header = { "id", "name"};private static FileWriter fileWriter = null;private static CSVPrinter csvPrinter = null;private static CSVFormat csvFormat = CSVFormat.DEFAULT.withRecordSeparator('\n');  // 每条记录间隔符public static void write(Map<String, String> info) {File file = new File("test.csv");System.out.println(file.getAbsolutePath());try {if (!file.exists()) {fileWriter = new FileWriter("test.csv",true);  // 创建test.csv的字符输出流csvPrinter = new CSVPrinter(fileWriter, csvFormat);csvPrinter.printRecords(header);  // 生成.csv表的字段名System.out.println("执行");}else {fileWriter = new FileWriter("test.csv",true);  // 创建test.csv的字符输出流csvPrinter = new CSVPrinter(fileWriter, csvFormat);System.out.println("文件存在");}Set<String> ids = info.keySet();for (String id : ids) {List<String> idName = new ArrayList();idName.add(id);idName.add(info.get(id));csvPrinter.printRecord(idName);  // 向.csv文件中添加记录数据}System.out.println("生成.csv文件");}catch(IOException e) {e.printStackTrace();}catch(Exception e) {e.printStackTrace();}finally {try {csvPrinter.flush();fileWriter.flush();fileWriter.close();csvPrinter.close();}catch (Exception e) {e.printStackTrace();}}}}

测试类：

package com.huihui.main;import java.util.HashMap;import java.util.Map;public class TestCsvFileBuilder {public static void main(String[] args) {Map<String, String> idName = new HashMap();idName.put("1", "Java");idName.put("2", "C++");idName.put("3", "Python");idName.put("4", "Ruby");CsvFileBuilder.write(idName);}}

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