package com.jiong.uploadify;

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class ModifyServlet extends HttpServlet
{

    /**
     * serialVersionUID
     */
    private static final long serialVersionUID = 8234179100191628473L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        this.doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {

        response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("UTF-8");

        /*
         * 获得图片名和裁剪后的图片信息
         */
        // String userid = request.getParameter("userid");
        String x = request.getParameter("x");
        String y = request.getParameter("y");
        String w = request.getParameter("w");
        String h = request.getParameter("h");
        String img = request.getParameter("img");

        int width = Integer.parseInt(w);
        int height = Integer.parseInt(h);
        // int rx = Integer.parseInt(x);
        // int ry = Integer.parseInt(y);

        // 文件格式
        String ext = img.substring(img.lastIndexOf(".") + 1);

        File srcfile = new File(getServletConfig().getServletContext().getRealPath("/") + img);
        FileInputStream is = null;
        ImageInputStream iis = null;
        try
        {
            // 读取文件
            Image image = ImageIO.read(srcfile);
            // 创建图像缓冲区
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            tag.getGraphics().drawImage(image.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0, 0, null);
            FileOutputStream out = new FileOutputStream(srcfile);
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            encoder.encode(tag);
            out.close();

            is = new FileInputStream(srcfile);
            iis = ImageIO.createImageInputStream(is);

            Iterator<ImageReader> it = ImageIO.getImageReadersByFormatName(ext);
            ImageReader reader = it.next();
            reader.setInput(iis);

            ImageReadParam param = reader.getDefaultReadParam();
            Rectangle rect = new Rectangle(Integer.parseInt(x), Integer.parseInt(y), 120, 120);
            param.setSourceRegion(rect);

            BufferedImage bi = reader.read(0, param);
            ImageIO.write(bi, ext, new File(getServletConfig().getServletContext().getRealPath("/") + img));

            response.getWriter().write("http://localhost:8080/myjcrop/" + img);
        } finally
        {
            if (is != null)
                is.close();
            if (iis != null)
                iis.close();
        }

    }

}