圖像縮略與加水印

//圖像處理工具類

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;

public class PictureTool {
	//實現縮略功能
	public static BufferedImage abbreviatedzoom(String path,int w,int h){
		ImageIcon imgIcon=new ImageIcon(path);
		Image img=imgIcon.getImage();
		
		BufferedImage buffImage=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
		Graphics2D g=buffImage.createGraphics();
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, w, h);
		g.drawImage(img,0,0,w,h,null);
		g.dispose();
		return buffImage;
	}
	//加水印
	public static BufferedImage watermarkzoom(BufferedImage buffImage,String mark){
		Graphics g=buffImage.getGraphics();
		g.setColor(Color.BLUE);
		Font f=new Font("Courier New",Font.BOLD,20);
		g.setFont(f);
		g.drawString(mark, 10, 20);
		g.dispose();
		return buffImage;
	}

}

//Servlet測試類

package com.control;

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
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;
import com.tool.PictureTool;

/**
 * Servlet implementation class Test
 */
@WebServlet("/Test")
public class Test extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setContentType("image/jpeg");
		ServletOutputStream sos=response.getOutputStream();
		
		String path=this.getServletContext().getRealPath("/")+"psb.jpg";
		BufferedImage buffImg=PictureTool.abbreviatedzoom(path, 100, 80);
		BufferedImage buffImg2=PictureTool.watermarkzoom(buffImg, "Hello");
		/*
		 * 第一種輸出方法
		ByteArrayOutputStream bos=new ByteArrayOutputStream();
		ImageIO.write(buffImg2, "jpeg", bos);
		byte[] buf=bos.toByteArray();
		response.setContentLength(buf.length);
		sos.write(buf);
		bos.close();
		sos.close();
		*/
		
		/*
		 * 第二種輸出方法
		 * */
		//創建JPEG圖像編碼器
		JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(sos);
		//編碼內存中的圖像數據到JPEG數據輸出流
		encoder.encode(buffImg2);
		sos.close();
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doGet(request, response);
	}

}