2019独角兽企业重金招聘Python工程师标准>>> 
CSV其实就是COMMA SEPARATED VALUE的缩写。
在开发中用Java操作csv文件有专门的的API叫javacsv.jar
javacsv.jar下载地址：
http://sourceforge.net/project/showfiles.php?group_id=33066
package com.syc.test.javaCSV; import java.io.IOException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List; import com.csvreader.CsvReader;
import com.csvreader.CsvWriter;
import com.syc.test.DAO.ConnectionDB;
import com.syc.test.bean.ReslutBean; public class Java2CSV { /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { // 从获取将要写入csv文件的结果集 List<ReslutBean> list = new ArrayList<ReslutBean>(); list = ConnectionDB.querySQL(); // 预组装csv文件内容标题行 String[][] data = new String[list.size() + 1][2]; data[0][0] = "Help_keyword_id"; data[0][1] = "Name"; // 预组装csv文件内容 int len = list.size(); for (int i = 0; i < len; i++) { data[i + 1][0] = list.get(i).getHelp_keyword_id(); data[i + 1][1] = list.get(i).getName(); } writerCsv("e://c测试.csv", data); readerCsv("e://c测试.csv"); } /** * 读取csv * * @param csvFilePath * @throws Exception */ public static void readerCsv(String csvFilePath) throws Exception { CsvReader reader = new CsvReader(csvFilePath, ',', Charset.forName("GBK"));// shift_jis日语字体,utf-8 reader.readHeaders(); String[] headers = reader.getHeaders(); List<Object[]> list = new ArrayList<Object[]>(); while (reader.readRecord()) { list.add(reader.getValues()); } Object[][] datas = new String[list.size()][]; for (int i = 0; i < list.size(); i++) { datas[i] = list.get(i); } /* * 以下输出 */ for (int i = 0; i < headers.length; i++) { System.out.print(headers[i] + "\t"); } System.out.println(""); for (int i = 0; i < datas.length; i++) { Object[] data = datas[i]; // 取出一组数据 for (int j = 0; j < data.length; j++) { Object cell = data[j]; System.out.print(cell + "\t"); } System.out.println(""); } } }
