commons-csv是Apache开源组织提供的用于读写CSV文件的工具包，比较简单，直接上代码：
package com.gujin.csv; import java.io.FileReader; import java.io.PrintWriter; import org.apache.commons.csv.CSVFormat; import org.apache.commons.csv.CSVParser; import org.apache.commons.csv.CSVPrinter; import org.apache.commons.csv.CSVRecord; import org.junit.Test; public class CSVTest { @Test public void write() throws Exception { Appendable out = new PrintWriter("file.csv"); CSVPrinter printer = CSVFormat.DEFAULT.withHeader("userId", "userName") .print(out); for (int i = 0; i < 10; i++) { printer.printRecord("userId" + i, "userName" + i); } printer.flush(); printer.close(); } @Test public void read() throws Exception { FileReader reader = new FileReader("file.csv"); CSVParser parser = CSVFormat.DEFAULT.withHeader("userId", "userName") .parse(reader); for (CSVRecord record : parser) { System.out .println(record.get("userId") + ":" + record.get("userName")); } reader.close(); } } 1234567891011121314151617181920212223242526272829303132333435363738394041 1234567891011121314151617181920212223242526272829303132333435363738394041