(图片)jsp上传图片，进行缩放处理

先看java代码：

import java.io.File;

import javax.imageio.ImageIO;

import java.awt.Image;

import java.awt.geom.AffineTransform;

import java.awt.image.AffineTransformOp;

import java.awt.image.BufferedImage;

try{

String fileName = "D:\\soft\\Tomcat 6.0\\webapps\\XXX\\upload\\images\\me.jpg";

File f = new File(fileName); //得到原始文件

double newHeight = 1.0; //设置缩放比例

double newWeight = 1.0; //设置缩放比例

String dir = "D:\\soft\\Tomcat 6.0\\webapps\\tianjin\\upload\\images";

File newFile = new File(dir,"me.jpg"); //新的文件路径及名字

BufferedImage bi = ImageIO.read(f);

//假设图片宽 高 最大为120 120

Image itemp = bi.getScaledInstance (120,120,bi.SCALE_SMOOTH);

if((bi.getHeight()>120) || (bi.getWidth()>120)){

if (bi.getHeight()>bi.getWidth()){

newHeight = 120.0/bi.getHeight();

}else{

newWeight = 120.0/bi.getWidth();

}

}

AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(newHeight, newWeight), null);

itemp = op.filter(bi, null);

try {

ImageIO.write((BufferedImage)itemp,"jpg", newFile);

System.out.println("well done");

}catch (Exception ex) {

ex.printStackTrace();

}

}catch(Exception e){

}

则在JSP中，先用smartupload上传到服务器上，然后再用上面的代码把它进行缩放以后，或者覆盖原有的图片，或者创建新的文件。