java写csv文件

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.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;


public class CSVUtil {
	
    public static void main(String[] args) {
         List<Map<String, String>> exportData = new ArrayList<Map<String, String>>();
         Map<String, String> row = null;
         LinkedHashMap<String, String> map =  new LinkedHashMap<String, String>();
         map.put("1", "第一列");
         map.put("2", "第二列");
         map.put("3", "第三列");
         map.put("4", "第四列");
         
         for (int i = 0; i < 100; i++) {
        	 row = new LinkedHashMap<String, String>();
             row.put("1", "11" + i);  
             row.put("2", "12" + i);
             row.put("3", "13" + i);
             row.put("4", "14" + i);
             exportData.add(row);
		}
         
         
        
         CSVUtil.createCSVFile(exportData, map, "d:/123/", "12");
     }

    /**
     * 
     * @param exportData 需要导出的数据
     * @param rowMapper 行名称
     * @param outPutPath 导出的路径
     * @param filename 文件名
     * @return csv文件
     */
    public static File createCSVFile(List exportData, LinkedHashMap rowMapper,
            String outPutPath, String filename) {

        File csvFile = null;
        BufferedWriter csvFileOutputStream = null;
        try {
        	//创建文件
            csvFile = new File(outPutPath + filename + ".csv");
            // csvFile.getParentFile().mkdir();
            File parent = csvFile.getParentFile();
            if (parent != null && !parent.exists()) {
                parent.mkdirs();
            }
            csvFile.createNewFile();

            // GB2312使正确读取分隔符","
            csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(
                    new FileOutputStream(csvFile), "GB2312"), 1024);
            // 写入文件头部
            for (Iterator propertyIterator = rowMapper.entrySet().iterator(); propertyIterator.hasNext();) {
                java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator
                        .next();
                csvFileOutputStream.write("\""
                        + propertyEntry.getValue().toString() + "\"");
                if (propertyIterator.hasNext()) {
                    csvFileOutputStream.write(",");
                }
            }
            csvFileOutputStream.newLine();

           


            // 写入文件内容
            for (Iterator iterator = exportData.iterator(); iterator.hasNext();) {  
               // Object row = (Object) iterator.next();  
            	LinkedHashMap row = (LinkedHashMap) iterator.next();
                System.out.println(row);
             
                for (Iterator propertyIterator = row.entrySet().iterator(); propertyIterator.hasNext();) {  
                    java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();  
                   // System.out.println( BeanUtils.getProperty(row, propertyEntry.getKey().toString()));
                    csvFileOutputStream.write("\""  
                            +  propertyEntry.getValue().toString() + "\"");  
                   if (propertyIterator.hasNext()) {  
                       csvFileOutputStream.write(",");  
                    }  
               }  
                if (iterator.hasNext()) {  
                   csvFileOutputStream.newLine();  
                }  
           }  
            csvFileOutputStream.flush();  
        } catch (Exception e) {  
           e.printStackTrace();  
        } finally {  
           try {  
                csvFileOutputStream.close();  
            } catch (IOException e) {  
               e.printStackTrace();
           }  
       }  
        return csvFile;
    }


}