关于Model层，向新文件内写数据问题，请大神们帮小弟看看：报错

package com.jfinal.weixin.demo.model;

import java.io.File;
import java.io.FileWriter;
import java.util.List;

import com.jfinal.kit.JsonKit;
import com.jfinal.plugin.activerecord.Model;

public class Picture extends Model<Picture> {
	public static final Picture dao = new Picture();

	public void picture() {
		String sql = "select ip.sid,ip.true_name,ip.score "
				+ "from iyb_customer_profile ip INNER JOIN vip_customer_profile vp ON ip.sid = vp.sid";
		List<Picture> picture = Picture.dao.find(sql);
		String json = JsonKit.toJson(picture);
		String fileName = "flare.json";
		String directory = "E:\\projects\\wxkg\\webapp\\picture\\";
		// File dir = new File(directory, fileName);
		// try {
		// dir.createNewFile();
		// } catch (IOException e) {
		// // TODO Auto-generated catch block
		// e.printStackTrace();
		// }
		// return picture;
		// File dir = new File(directory);
		// if (!dir.exists())
		// dir.mkdirs();
		// String target = directory + File.separator + fileName;
		// FileWriter fw = new FileWriter(target);
		// try {
		// fw.write(picture);
		// } finally {
		// fw.close();
		// }
		File dir = new File(directory);
		if (!dir.exists())
			dir.mkdirs();

		String target = directory + File.separator + fileName;
		FileWriter fw = new FileWriter(target);
		try {
			fw.write(picture);       //<<-----这里要求将这面的picture修改为int类型，修                                                    //改了之后， 上面查询出来的SQL会报错
		} finally {
			fw.close();
		}

	}

}

请各路大神帮我看看这个问题，我想用SQL查询出来的数据插入到  flare.json文件里面去。
谢谢。