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package zengxiaomeng;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.swing.ImageIcon;

import com.jspsmart.upload.*;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.*;
import com.sun.image.codec.jpeg.*;

public class UploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;
    private final static long FILE_MAX_SIZE=4000000;//設置允許上傳文件的大小限制
    private final static String FILE_EXTEND_NAME="jpg,JPG,gif,GIF,png,PNG";//設置允許上傳文件的擴展名
    private final static String UPLOAD_DIRECTORY="/upload/";//設置上傳的路徑
    private String path; //上傳的絕對路徑
    private ServletConfig config;
    
    final public void init(ServletConfig config) throws ServletException {
        this.config = config;
        path=config.getServletContext().getRealPath(UPLOAD_DIRECTORY)+"/";
    }
    final public ServletConfig getServletConfig() {
        return config;
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //PrintWriter out = response.getWriter();
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=GBK"); 
        //PrintWriter out = response.getWriter();

        String filename=upload(config,request,response);
        watermark(filename);//生成水印
        reduce(filename);//生成縮略圖
        response.sendRedirect("/Test.htm");
    }
    public void  destroy () {
    }
    //********************************附加的一些自定義方法********************************//
    //上傳文件
    private String upload(ServletConfig config,HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
        //初始化上傳組件
        SmartUpload mySmartUpload=new SmartUpload();
        mySmartUpload.initialize(config,request,response);
        mySmartUpload.setAllowedFilesList(FILE_EXTEND_NAME);
        mySmartUpload.setMaxFileSize(FILE_MAX_SIZE);
        //上傳文件
        try{
            mySmartUpload.upload();
            //mySmartUpload.save(path);//注釋掉此行將用原始文件名來(lái)保存
            //以下三行代碼利用Calendar對象生成一個(gè)隨機毫秒數來(lái)作為新的文件名保存
            com.jspsmart.upload.File myFile=mySmartUpload.getFiles().getFile(0);//返回剛剛上傳的文件對象
            String filename=String.valueOf(Calendar.getInstance().getTimeInMillis())+"."+myFile.getFileExt();//構造文件名
            myFile.saveAs(path+filename,SmartUpload.SAVE_PHYSICAL);//保存文件為新的文件名
            return filename;
        }catch(Exception e){}
        return "0";
    }
    //生成縮略圖
    private void reduce(String filename){
        //設置新文件的寬和高
        int tagImageWidth=102;
        int tagImageHeight=120;
        
        ImageIcon srcFile=new ImageIcon(path+filename);//讀入源文件
        Image srcImage =srcFile.getImage();//構造Image對象 
        BufferedImage tagImage = new BufferedImage(tagImageWidth,tagImageHeight,BufferedImage.TYPE_INT_RGB);//構造圖像緩存對象
        tagImage.getGraphics().drawImage(srcImage,0,0,tagImageWidth,tagImageHeight,null);//繪制縮小后的圖
        paint(tagImage,"s_"+filename);
    }
    //生成水印
    private void watermark(String filename){
        Color color=Color.RED;//前景色
        Color backgroundColor=Color.WHITE;//背景色
        String word="zengxiaomeng";//水印文字
        String wartmarkfilename="fjsenlogo.jpg";//水印圖片地址
        int watermarkLocationX=100;
        int watermarkLocationY=100;
        int wordLocationX=100;
        int wordLocationY=100;
        
        ImageIcon srcFile=new ImageIcon(path+filename);//讀入源文件
        Image srcImage =srcFile.getImage();//構造Image對象        
        ImageIcon watermarkFile=new ImageIcon(path+wartmarkfilename);//讀入水印文件
        Image watermarkImage =watermarkFile.getImage();//構造水印圖片對象        
        BufferedImage tagImage=new BufferedImage(srcImage.getWidth(null),srcImage.getHeight(null), BufferedImage.TYPE_INT_RGB);//構造圖像緩存對象 
        
        Graphics2D g=tagImage.createGraphics( ); 
        g.setColor(color);//設置繪圖筆的前景色
        g.setBackground(backgroundColor);//設置繪圖筆的背景色
        g.drawImage(srcImage, 0, 0, null );//先繪制源圖
        g.drawImage(watermarkImage, watermarkLocationX,watermarkLocationY, null ); //添加水印圖片
        g.drawString(word,wordLocationX,wordLocationY); //添加文字
        g.dispose(); 
        paint(tagImage,filename);
    }
    private void paint(BufferedImage tagImage,String tagFilename){
        try{ 
            FileOutputStream tagFile=new FileOutputStream(path+tagFilename); 
            JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(tagFile); 
            JPEGEncodeParam param=encoder.getDefaultJPEGEncodeParam(tagImage); 
            param.setQuality(50f, true); 
            encoder.encode(tagImage, param); 
            tagFile.close(); 
        }catch(Exception e){} 
    }
}