1.protected void processRequest(HttpServletRequest request,
2.
3.HttpServletResponse response) throws ServletException, IOException {
4.
5.String Pic = (String) request.getParameter("p");
6.
7.int PointX = Integer.parseInt(request.getParameter("x"));
8.
9.int PointY = Integer.parseInt(request.getParameter("y"));
10.
11.int CutWidth = Integer.parseInt(request.getParameter("w"));
12.
13.int CutHeight = Integer.parseInt(request.getParameter("h"));
14.
15.// 图片宽度
16.
17.int PicWidth = Integer.parseInt(request.getParameter("pw"));
18.
19.// 图片高度
20.
21.int PicHeight = Integer.parseInt(request.getParameter("ph"));
22.
23.response.setContentType("image/jpeg");
24.
25.response.setHeader("Pragma", "No-cache");
26.
27.response.setHeader("Cache-Control", "no-cache");
28.
29.response.setDateHeader("Expires", 0);
30.
31.HttpSession session = request.getSession();
32.
33.String picPath = Pic;
34.
35.String path = request.getRealPath(picPath);
36.
37.ServletOutputStream responseOutputStream = response.getOutputStream();
38.
39.cut(path, responseOutputStream, CutWidth, CutHeight, PointX, PointY,
40.
41.PicWidth, PicHeight);
42.
43.// 以下关闭输入流！
44.
45.responseOutputStream.flush();
46.
47.responseOutputStream.close();
48.
49.}
50.
51./**
52.
53.* 图片切割
54.
55.* @param srcImageFile 图片地址
56.
57.* @param responseOutputStream servlet输出流
58.
59.* @param w 切割宽度
60.
61.* @param h 切割高度
62.
63.* @param x1 开始x结点（left）
64.
65.* @param y1 开始y结点（top）
66.
67.* @param sw 图片宽度
68.
69.* @param sh 图片高度
70.
71.*/
72.
73.public void cut(String srcImageFile,ServletOutputStream responseOutputStream, int w, int h, int x1,
74.
75.int y1, int sw, int sh) {
76.
77.try {
78.
79.// http://localhost:8080/ImpCra/createServlet?p=Sunset.jpg&x=117&y=201&w=61&h=50&pw=300&ph=400
80.
81.Image img;
82.
83.ImageFilter cropFilter;
84.
85.// 读取源图像
86.
87.BufferedImage bi = ImageIO.read(new File(srcImageFile));
88.
89.if (sw >= w && sh >= h) {
90.
91.Image image = bi.getScaledInstance(sw, sh, Image.SCALE_DEFAULT);
92.
93.// 剪切起始坐标点
94.
95.int x = x1;
96.
97.int y = y1;
98.
99.int destWidth = w; // 切片宽度
100.
101.int destHeight = h; // 切片高度
102.
103.// 图片比例
104.
105.double pw = sw;
106.
107.double ph = sh;
108.
109.double m = (double) sw / pw;
110.
111.double n = (double) sh / ph;
112.
113.int wth = (int) (destWidth * m);
114.
115.int hth = (int) (destHeight * n);
116.
117.int xx = (int) (x * m);
118.
119.int yy = (int) (y * n);
120.
121.// 四个参数分别为图像起点坐标和宽高
122.
123.// 即: CropImageFilter(int x,int y,int width,int height)
124.
125.cropFilter = new CropImageFilter(xx, yy, wth, hth);
126.
127.img = Toolkit.getDefaultToolkit().createImage(
128.
129.new FilteredImageSource(image.getSource(), cropFilter));
130.
131.BufferedImage tag = new BufferedImage(w, h,
132.
133.BufferedImage.TYPE_INT_RGB);
134.
135.Graphics g = tag.getGraphics();
136.
137.g.drawImage(img, 0, 0, null); // 绘制缩小后的图
138.
139.g.dispose();
140.
141.// 输出为文件
142.
143.ImageIO.write(tag, "JPEG", responseOutputStream);
144.
145.}
146.
147.} catch (Exception e) {
148.
149.e.printStackTrace();
150.
151.}
152.
153.}
154.
155.
156.
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