java写csv文件

package com.jynine;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

/**
 * 简易的Csv工具类
 * @author jynine
 *
 */
public class CsvUtil {
	public static void writeCsv(String pathname,List<String[]> list){
		File file = new File(pathname);
		if(!file.exists()){
			file.mkdir();
		}
		String filename = String.valueOf(System.currentTimeMillis());
		File csvFile = new File(pathname + "/"+filename +".csv"); 
		if(!csvFile.exists()){
			try {
				csvFile.createNewFile();
				//用FileWriter中文会出现乱码，所以用它的父类OutputStreamWriter
				//FileWriter fw = new FileWriter(csvFile);
				OutputStreamWriter os =  new OutputStreamWriter(new FileOutputStream(csvFile), "GBK");
				if(list != null && list.size() > 0){
					for (int i = 0; i < list.size(); i++) {
						String[] s = list.get(i);
						for (int j = 0; j < s.length; j++) {
							if(j==s.length -1){
								os.write(s[j]);
			
							}else{								
								os.write(s[j]+",");
							}
						}
						os.write("\n");
					}
				}
				os.close();
				
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	public static void main(String[] args) {
		List<String[]> list = new ArrayList<String[]>();
		list.add(new String[]{"电话号码","用户套餐","套餐编码"});
		list.add( new String[]{"12123123","21312312312","aaaaaaaaaa"});
		list.add( new String[]{"12123123","21312312312","aaaaaaaaaa"});
		list.add( new String[]{"12123123","21312312312","aaaaaaaaaa"});
		writeCsv("D:/", list);
		System.out.println("-----------------");
	}
}