uploadimg.java

Jive是基于JSP/JAVA技术构架的一个大型BBS论坛系统

package com.jdon.picture;

import com.jivesoftware.util.*;

import java.io.*;
import java.util.*;
import java.awt.image.BufferedImage;
import java.awt.Image;
import java.awt.image.AffineTransformOp;
import javax.imageio.ImageIO;
import java.awt.geom.AffineTransform;

/**
 * tool of handle image,include rename; change big picture to small picture
 * @author Sunny Peng
 */
public class UploadImg {

  private String fromdir = "";
  public void setFromdir(String fromdir) {
    this.fromdir = fromdir;
  }

  private String todir = "";
  public void setTodir(String todir) {
    this.todir = todir;
  }

  private String imgfile = "";
  public void setImgfile(String imgfile) {
    this.imgfile = imgfile;
  }

  //sysimgfile is no .gif or no .jpg or no.png's filename
  //it is different from imgfile, imgfile is full name,such as peng.gif
  //but sysimgfile is peng, no .gif
  private String sysimgfile = "";
  public void setSysimgfile(String sysimgfile) {
    this.sysimgfile = sysimgfile;
  }

  private String imgfileResult = "";
  public String getImgfileResult() {
    return imgfileResult;
  }

  private int newwidth = 0;
  public int getNewwidth() {
    return newwidth;
  }

  private int newheight = 0;
  public int getNewheight() {
    return newheight;
  }

  /**
   *   @param imgfile1 dir1  is rename source;
   *   @param target is System's imgname
   *
   */

  public void init(String fromdir, String todir, String imgfile,
                   String sysimgfile) {
    this.fromdir = fromdir;
    this.todir = todir;
    this.imgfile = imgfile;
    this.sysimgfile = sysimgfile;

  }

  /**����*/
  public void renImgname(String ext) throws Exception {
    FileDeal fd = new FileDeal();
    File filepic1 = new File(fromdir, imgfile);
    if (!filepic1.isFile())
      return;
    File filepic2 = new File(todir, sysimgfile + ext);
    try {
      fd.copy(filepic1.toString(), filepic2.toString());
    }
    catch (Exception ex) {
      throw new Exception(" renImgname: " + ex.getMessage());
    }

  }

  /**
   * deciede if it is a picture
   * @param fromdir
   * @param imgfile
   * @param todir
   * @param sysimgfile
   * @return  system picture name; no dirtectry
   */

  public String dealUploadImg() throws Exception {
    if ( (imgfile.equals("")) || (fromdir.equals(""))
        || (todir.equals("")) || (sysimgfile.equals(""))) {
      return "";
    }
    if (isGif(imgfile)) {
      renImgname(".gif");
      imgfileResult = sysimgfile + ".gif";
    }
    else if (isJpg(imgfile)) {
      renImgname(".jpg");
      imgfileResult = sysimgfile + ".jpg";
    }
    else if (isPng(imgfile)) {
      renImgname(".png");
      imgfileResult = sysimgfile + ".png";
    }
    else {
      File tempfile = new File(fromdir, imgfile);
      if (!tempfile.delete())
        throw new Exception(fromdir + "/" + imgfile + " delete error!");
    }
    return imgfileResult;
  }

  public boolean isGif(String file) {
    if (file.toLowerCase().endsWith("gif")) {
      return true;
    }
    else {
      return false;
    }
  }

  public boolean isJpg(String file) {
    if (file.toLowerCase().endsWith("jpg")) {
      return true;
    }
    else {
      return false;
    }
  }

  public boolean isPng(String file) {
    if (file.toLowerCase().endsWith("png")) {
      return true;
    }
    else {
      return false;
    }
  }

  /**
   *  create a preview small picture
   *  it has same function as dealUploadImg()
   *  gif --> png
   *  jpg --> jpg
   * */

  public String CreateThumbnail(int maxwidth, int maxheight) throws Exception {
    String ext = "";

    double Ratio = getImagSize(maxwidth, maxheight);

    File F = new File(fromdir, imgfile);
    if (!F.isFile())
      return "";
    BufferedImage Bi = ImageIO.read(F);
    AffineTransformOp op = new AffineTransformOp(AffineTransform.
                                                 getScaleInstance(Ratio, Ratio), null);
    Image Itemp = op.filter(Bi, null);

    if (isJpg(imgfile)) {
      ext = "jpg";
    }
    else {
      ext = "png";
    }
    imgfileResult = sysimgfile + "." + ext;
    File ThF = new File(todir, imgfileResult);

    try {
      ImageIO.write( (BufferedImage) Itemp, ext, ThF);
    }
    catch (Exception ex) {
      throw new Exception(" ImageIo.write error in CreatThum.: " +
                          ex.getMessage());
    }
    return imgfileResult;
  }

  /**�����maxwidth maxheight�淶�µ�*/
  public double getImagSize(int maxwidth, int maxheight) throws Exception {

    double Ratio = 1.0;

    File F = new File(fromdir, imgfile);
    if (!F.isFile())
      throw new Exception(F + " is not image file error in CreateThumbnail!");

    BufferedImage Bi = ImageIO.read(F);
    //  Image Itemp = Bi.getScaledInstance (maxwidth,maxheight,Bi.SCALE_SMOOTH);

    newwidth = Bi.getWidth();
    newheight = Bi.getHeight();

    if (newwidth > maxwidth) {
      Ratio = (new Integer(maxwidth)).doubleValue() / newwidth;
    }
    newwidth = (new Double(Ratio * Bi.getWidth())).intValue();
    newheight = (new Double(Ratio * Bi.getHeight())).intValue();

    if (newheight > maxheight) {
      Ratio = Ratio * (new Integer(maxheight)).doubleValue() / newheight;
    }
    newwidth = (new Double(Ratio * Bi.getWidth())).intValue();
    newheight = (new Double(Ratio * Bi.getHeight())).intValue();

    //        if  ((ic.getHeight()>maxheight) || (ic.getWidth()>maxwidth)){
//        	  if (ic.getHeight()>ic.getWidth()){
//        	     Ratio =(new Integer(maxheight)).doubleValue()/ic.getHeight();
//        	  }else
//           	     Ratio = (new Integer(maxwidth)).doubleValue()/ic.getWidth();
//        }

    Bi = null;
    return Ratio;
  }

}