CSV其实就是COMMA SEPARATED VALUE的缩写。csv文件是分隔文件，如果使用java的io流来写，比较麻烦，这里为大家提供一个javacsv的jar包，这个很方便操作csv文件。
下载地址：http://xiazai.phpstudy.net/201608/yuanma/javcsv(phpstudy.net).rar
那如何使用呢？
只要看看以下一个例子，您一下就明白了。
import com.csvreader.CsvReader;
import com.csvreader.CsvWriter;
import org.junit.Test;
import java.io.IOException;
import java.nio.charset.Charset;
/**
* Created by javalittleman on 2016/8/18.
*/
public class TestCVS {
/**
* CSV导出
*
* @throws Exception
*/
@Test
public void exportCsv() throws IOException {
String srcCSV = "F:/cnt_programa.csv";
String targetFile = "F:/test.csv";
CsvReader reader = new CsvReader(srcCSV, ',', Charset.forName("UTF-8"));
CsvWriter write =new CsvWriter(targetFile,',',Charset.forName("UTF-8"));
//各字段以引号标记
write.setForceQualifier(true);
//路过表头
//r.readHeaders();
//逐条读取记录，直至读完
String[] header = {};
while (reader.readRecord()) {
//把头保存起来
if (reader.getCurrentRecord()==0){
header = reader.getValues();
}
//获取当前记录位置
System.out.print(reader.getCurrentRecord() + ".");
//读取一条记录
System.out.println(reader.getRawRecord());
String[] tmp = {reader.getValues()[0],reader.getValues()[1]};
//修改记录，并只写入第一个字段和第二字段
if (!header[1].equals(tmp[1]) && ("".equals(tmp[1])||tmp==null)){
tmp[1]="空";
write.writeRecord(tmp);
}else{
write.writeRecord(new String[]{reader.getValues()[0],reader.getValues()[1]});
}
}
reader.close();
write.close();
}
}
cnt_programa.csv文件：
"id","pid","no","serial","name","createtime" "100000","","No100000","","公司新闻","2016/8/23 17:12:09" "100001","","No100001","","热点资讯","2016/8/24 17:12:36" "100046","100001","No100046","1","银行动态","2016/8/1 10:36:31" "100052","100001","No100052","2","法律法规","2016/8/2 20:39:10" "100088","100001","No100088","3","专业文库","2016/8/5 19:05:47"
test.csv
"id","pid" "100000","空" "100001","空" "100046","100001" "100052","100001" "100088","100001"
以上所述是小编给大家介绍的使用Javacsv.jar的jar包操作csv文件的方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对phpstudy网站的支持！