查询数据库保存成CSV格式

package cn.com.atmb.gfs.work.Bookdemo;

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

import cn.com.atmb.configureFiles.propertityUtil;
import cn.com.atmb.gfs.database.implementations.DAOTool;
import cn.com.atmb.gfs.database.interfaces.BaseDAO;

/**
 * 
 * CSV文件导出工具类
 */
public class CSVUtil {
	static propertityUtil pro = propertityUtil.getInstance("path.properties");
	static String PATH=pro.getProperty("PATH");
	static String FILENAME=pro.getProperty("FILENAME");
	/**
	 * CSV文件生成方法
	 * 
	 * @param head 头部标题
	 * @param dataList 内容
	 * @param outPutPath 文件路径
	 * @param filename 文件名称
	 * @return
	 */
	public static File createCSVFile(List<Object> head,List<List<Object>> dataList, String outPutPath, String filename) {

		File csvFile = null;
		BufferedWriter csvWtriter = null;
		try {
			//文件储存位置
			csvFile = new File(outPutPath + File.separator + filename + ".csv");
			File parent = csvFile.getParentFile();
			if (parent != null && !parent.exists()) {
				parent.mkdirs();
			}
			csvFile.createNewFile();

			// GB2312使正确读取分隔符","
			csvWtriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "GB2312"), 1024);
			// 写入文件头部
			writeRow(head, csvWtriter);
			// 写入文件内容
			for (List<Object> row : dataList) {
				writeRow(row, csvWtriter);
			}
			csvWtriter.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				csvWtriter.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return csvFile;
	}

	/**
	 * 写一行数据方法
	 * 
	 * @param row
	 * @param csvWriter
	 * @throws IOException
	 */
	private static void writeRow(List<Object> row, BufferedWriter csvWriter)
			throws IOException {
		// 写入文件头部
		for (Object data : row) {
//			StringBuffer sb = new StringBuffer();
			String rowStr="";
//			rowStr= sb.append("\"").append(data).append("\",").toString();
			if(data.toString().contains("\"")){
				rowStr="\""+data.toString().replaceAll("\"","\"\"")+"\",";
			}else{
				rowStr="\""+data.toString()+"\",";
			}
			csvWriter.write(rowStr);
		}
		csvWriter.newLine();
	}
	/**
	 * 拼装数据方法
	 * @param retList 数据库查询结果集合
	 */
	public static void AssembledData(List<Map<String,Object>> retList) {
		if(retList==null||retList.size()==0){
			//
		}else{
			List<Object> head=new ArrayList<Object>();
			List<List<Object>> dataList=new ArrayList<List<Object>>();
			for (Map<String, Object> map : retList) {
				List<Object> date=new ArrayList<Object>();
				for(Object key:map.keySet()){
					date.add(map.get(key));
				}
				dataList.add(date);
			}
			for(Object ob:retList.get(0).keySet()){
				head.add(ob);
			}
			System.out.println(head);
			System.out.println(dataList);
			createCSVFile(head,dataList,PATH,FILENAME);
		}
		
	}
	
	public static void run(){
                //querySql查询数据库方法
		List<Map<String,Object>> retList=querySql();
		AssembledData(retList);
	}
}