public class ImageCropper extends IHttpHandler{
public void ProcessRequest(HttpContext context)
{
String ImgPath = Convert.ToString(context.Request["p"]);
int PointX = Convert.ToInt32(context.Request["x"]);
int PointY = Convert.ToInt32(context.Request["y"]);
int CutWidth = Convert.ToInt32(context.Request["w"]);
int CutHeight = Convert.ToInt32(context.Request["h"]);
int PicWidth = Convert.ToInt32(context.Request["pw"]);
int PicHeight = Convert.ToInt32(context.Request["ph"]); context.Response.ContentType = "image/jpeg";
ShowImage(HttpContext.Current.Server.MapPath(ImgPath), PointX, PointY, CutWidth, CutHeight, PicWidth, PicHeight).WriteTo(context.Response.OutputStream);
} private MemoryStream ShowImage(String path, int PointX, int PointY, int CutWidth, int CutHeight, int PicWidth, int PicHeight)
{
Image image = Image.FromFile(path);
BeanMap bm = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Graphics graphics = Graphics.FromImage(bm);
graphics.DrawImage(image, new Rectangle(0, 0, CutWidth, CutHeight), PointX * image.Width / PicWidth, PointY * image.Height / PicHeight, CutWidth * image.Width / PicWidth, CutHeight * image.Height / PicHeight, GraphicsUnit.Pixel);
int a = path.LastIndexOf('.');
int b = path.LastIndexOf('\\');
string _newPic = path.Substring(0, b) + "\\new_" + DateTime.Now.ToFileTimeUtc().ToString("X") + ".jpg";
bm.Save(_newPic, System.Drawing.Imaging.ImageFormat.Jpeg);
MemoryStream ms = new MemoryStream();
bm.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
image.Dispose();
graphics.Dispose();
bm.Dispose();
return ms;
}
public bool IsReusable
{
get
{
return false;
}
}
}
public void ProcessRequest(HttpContext context)
{
String ImgPath = Convert.ToString(context.Request["p"]);
int PointX = Convert.ToInt32(context.Request["x"]);
int PointY = Convert.ToInt32(context.Request["y"]);
int CutWidth = Convert.ToInt32(context.Request["w"]);
int CutHeight = Convert.ToInt32(context.Request["h"]);
int PicWidth = Convert.ToInt32(context.Request["pw"]);
int PicHeight = Convert.ToInt32(context.Request["ph"]); context.Response.ContentType = "image/jpeg";
ShowImage(HttpContext.Current.Server.MapPath(ImgPath), PointX, PointY, CutWidth, CutHeight, PicWidth, PicHeight).WriteTo(context.Response.OutputStream);
} private MemoryStream ShowImage(String path, int PointX, int PointY, int CutWidth, int CutHeight, int PicWidth, int PicHeight)
{
Image image = Image.FromFile(path);
BeanMap bm = new Bitmap(CutWidth, CutHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
Graphics graphics = Graphics.FromImage(bm);
graphics.DrawImage(image, new Rectangle(0, 0, CutWidth, CutHeight), PointX * image.Width / PicWidth, PointY * image.Height / PicHeight, CutWidth * image.Width / PicWidth, CutHeight * image.Height / PicHeight, GraphicsUnit.Pixel);
int a = path.LastIndexOf('.');
int b = path.LastIndexOf('\\');
string _newPic = path.Substring(0, b) + "\\new_" + DateTime.Now.ToFileTimeUtc().ToString("X") + ".jpg";
bm.Save(_newPic, System.Drawing.Imaging.ImageFormat.Jpeg);
MemoryStream ms = new MemoryStream();
bm.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
image.Dispose();
graphics.Dispose();
bm.Dispose();
return ms;
}
public bool IsReusable
{
get
{
return false;
}
}
}
java和.net是完全不同的处理方法,为什么要转呢
import java.io.*;import java.awt.*;
import java.awt.image.*;import com.sun.image.codec.jpeg.*;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c)2007-6-13</p>
* <p>Company: fuen</p>
* @author 杨振朋
* @version 1.0
*/
public class ccc {
private String srcFile;
private String destFile;
private int width;
private int height;
private Image img;
/**
* 构造函数
* @param fileName String
* @throws IOException
*/
public ccc(String fileName) throws IOException {
File _file = new File(fileName); //读入文件
this.srcFile = _file.getName();
this.destFile = "c:/aa.jpg";//this.srcFile.substring(0, this.srcFile.lastIndexOf(".")) +"_s.jpg";
img = javax.imageio.ImageIO.read(_file); //构造Image对象
width = img.getWidth(null); //得到源图宽
height = img.getHeight(null); //得到源图长
} /**
* 强制压缩/放大图片到固定的大小
* @param w int 新宽度
* @param h int 新高度
* @throws IOException
*/
public void resize(int w, int h) throws IOException {
BufferedImage _image = new BufferedImage(w, h,BufferedImage.TYPE_INT_RGB);
_image.getGraphics().drawImage(img, 0, 0, w, h, null); //绘制缩小后的图
FileOutputStream newimageout = new FileOutputStream(destFile); //输出到文件流
/*
* JPEGImageEncoder 将图像缓冲数据编码为 JPEG 数据流。该接口的用户应在 Raster
* 或 BufferedImage 中提供图像数据,在 JPEGEncodeParams 对象中设置必要的参数,
* 并成功地打开 OutputStream(编码 JPEG 流的目的流)。JPEGImageEncoder 接口可
* 将图像数据编码为互换的缩略 JPEG 数据流,该数据流将写入提供给编码器的 OutputStream 中。
注意:com.sun.image.codec.jpeg 包中的类并不属于核心 Java API。它们属于 Sun 发布的
JDK 和 JRE 产品的组成部分。虽然其它获得许可方可能选择发布这些类,但开发人员不能寄
希望于从非 Sun 实现的软件中得到它们。我们期望相同的功能最终可以在核心 API 或标准扩
展中得到。
*/
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimageout);
encoder.encode(_image); //近JPEG编码
newimageout.close();
} /**
* 按照固定的比例缩放图片
* @param t double 比例
* @throws IOException
*/
public void resize(double t) throws IOException {
int w = (int) (width * t);
int h = (int) (height * t);
resize(w, h);
} /**
* 以宽度为基准,等比例放缩图片
* @param w int 新宽度
* @throws IOException
*/
public void resizeByWidth(int w) throws IOException {
int h = (int) (height * w / width);
resize(w, h);
} /**
* 以高度为基准,等比例缩放图片
* @param h int 新高度
* @throws IOException
*/
public void resizeByHeight(int h) throws IOException {
int w = (int) (width * h / height);
resize(w, h);
} /**
* 按照最大高度限制,生成最大的等比例缩略图
* @param w int 最大宽度
* @param h int 最大高度
* @throws IOException
*/
public void resizeFix(int w, int h) throws IOException {
if (width / height > w / h) {
resizeByWidth(w);
}
else {
resizeByHeight(h);
}
} /**
* 设置目标文件名
* setDestFile
* @param fileName String 文件名字符串
*/
public void setDestFile(String fileName) throws Exception {
if (!fileName.endsWith(".jpg")) {
throw new Exception("Dest File Must end with \".jpg\".");
}
destFile = fileName;
} /**
* 获取目标文件名
* getDestFile
*/
public String getDestFile() {
return destFile;
} /**
* 获取图片原始宽度
* getSrcWidth
*/
public int getSrcWidth() {
return width;
}
/**
* 获取图片原始高度
* getSrcHeight
*/
public int getSrcHeight() {
return height;
}
/*
* 调用测试
*/
public static void main(String[] args) throws Exception {
ccc ccc = new ccc("c:/image2.jpg");
ccc.resizeFix(500, 300);
}
}