Source Code Cross Referenced for DbImageServlet.java in  » Web-Server » Quadcap-Web-Server » com » quadcap » app » dbimage » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Quadcap Web Server » com.quadcap.app.dbimage 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.app.dbimage;
002:
003:        /* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.io.ByteArrayOutputStream;
042:        import java.io.IOException;
043:        import java.io.InputStream;
044:        import java.io.OutputStream;
045:
046:        import java.util.Enumeration;
047:        import java.util.Properties;
048:
049:        import java.sql.Connection;
050:        import java.sql.DatabaseMetaData;
051:        import java.sql.DriverManager;
052:        import java.sql.PreparedStatement;
053:        import java.sql.ResultSet;
054:        import java.sql.Statement;
055:        import java.sql.SQLException;
056:
057:        import javax.servlet.ServletConfig;
058:        import javax.servlet.ServletException;
059:
060:        import javax.servlet.http.HttpServlet;
061:        import javax.servlet.http.HttpServletRequest;
062:        import javax.servlet.http.HttpServletResponse;
063:
064:        // ---- image libraries
065:        import java.awt.Image;
066:        import java.awt.Graphics2D;
067:        import java.awt.geom.AffineTransform;
068:        import java.awt.image.BufferedImage;
069:        import java.io.IOException;
070:        import java.io.OutputStream;
071:        import java.io.FileOutputStream;
072:        import javax.swing.ImageIcon;
073:        import com.sun.image.codec.jpeg.JPEGCodec;
074:        import com.sun.image.codec.jpeg.JPEGImageEncoder;
075:
076:        /**
077:         * This servlet fetches and returns images from the database.
078:         *
079:         * @author Stan Bailes
080:         */
081:        public class DbImageServlet extends HttpServlet {
082:            String url = null;
083:
084:            public void init(ServletConfig config) throws ServletException {
085:                super .init(config);
086:                try {
087:                    url = config.getInitParameter("jdbc.url");
088:                    if (url == null) {
089:                        throw new ServletException("No jdbc.url property");
090:                    } else {
091:                        String driver = "com.quadcap.jdbc.JdbcDriver";
092:                        String d = config.getInitParameter("jdbc.driver");
093:                        if (d != null)
094:                            driver = d;
095:                        Class.forName(driver);
096:                    }
097:                    config.getServletContext().setAttribute("servlet", this );
098:
099:                    Connection conn = getConnection();
100:                    Statement stmt = conn.createStatement();
101:                    try {
102:                        DatabaseMetaData dbmeta = conn.getMetaData();
103:                        ResultSet rs = dbmeta.getTables(null, null, "images",
104:                                null);
105:                        if (!rs.next()) {
106:                            stmt.execute("create table images("
107:                                    + " name varchar(99999), "
108:                                    + " maxDim int, " + " data blob,"
109:                                    + " size int)");
110:                            stmt
111:                                    .execute("create unique index images1 on images(name, maxDim)");
112:                        }
113:                        rs.close();
114:                    } finally {
115:                        stmt.close();
116:                        conn.close();
117:                    }
118:
119:                } catch (Exception e) {
120:                    e.printStackTrace(System.err);
121:                    throw new ServletException(e);
122:                }
123:            }
124:
125:            public Connection getConnection() throws SQLException {
126:                Properties p = new Properties();
127:                p.put("create", "true");
128:                return DriverManager.getConnection(url, p);
129:            }
130:
131:            byte[] resizeImage(byte[] imageBytes, int maxDim)
132:                    throws IOException {
133:                ImageIcon inImage = new ImageIcon(imageBytes);
134:
135:                // Determine the scale.
136:                double scale = (double) maxDim
137:                        / (double) inImage.getIconHeight();
138:
139:                if (inImage.getIconWidth() > inImage.getIconHeight()) {
140:                    scale = (double) maxDim / (double) inImage.getIconWidth();
141:                }
142:
143:                // Determine size of new image. 
144:                // One of them hould equal maxDim.
145:                int scaledW = (int) (scale * inImage.getIconWidth());
146:                int scaledH = (int) (scale * inImage.getIconHeight());
147:
148:                // Create an image buffer in which to paint on.
149:                BufferedImage outImage = new BufferedImage(scaledW, scaledH,
150:                        BufferedImage.TYPE_INT_RGB);
151:
152:                // Set the scale.
153:                AffineTransform tx = new AffineTransform();
154:
155:                // If the image is smaller than the desired image size,
156:                // don't bother scaling.
157:                if (scale < 1.0d) {
158:                    tx.scale(scale, scale);
159:                }
160:
161:                // Paint image.
162:                Graphics2D g2d = outImage.createGraphics();
163:                g2d.drawImage(inImage.getImage(), tx, null);
164:                g2d.dispose();
165:
166:                // JPEG-encode the image and write the response
167:                ByteArrayOutputStream os = new ByteArrayOutputStream();
168:                JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
169:                encoder.encode(outImage);
170:
171:                return os.toByteArray();
172:            }
173:
174:            void sendImage(byte[] image, HttpServletResponse response)
175:                    throws ServletException, IOException {
176:                OutputStream os = response.getOutputStream();
177:                response.setContentLength(image.length);
178:                os.write(image);
179:            }
180:
181:            void storeImage(Connection conn, byte[] image, String name, int dim)
182:                    throws SQLException {
183:                PreparedStatement p = conn
184:                        .prepareStatement("insert into images(?,?,?,?)");
185:                p.clearParameters();
186:                p.setString(1, name);
187:                p.setInt(2, image.length);
188:                p.setBytes(3, image);
189:                p.setInt(4, dim);
190:                p.executeUpdate();
191:                p.close();
192:            }
193:
194:            public void doGet(HttpServletRequest request,
195:                    HttpServletResponse response) throws ServletException {
196:                String s = request.getServletPath();
197:                response.setContentType(getServletContext().getMimeType(s));
198:                Connection conn;
199:                try {
200:                    conn = getConnection();
201:                } catch (SQLException ex) {
202:                    throw new ServletException(ex);
203:                }
204:                int dim = -1;
205:                String mdim = request.getParameter("maxDim");
206:                if (mdim != null) {
207:                    dim = Integer.parseInt(mdim);
208:                }
209:                try {
210:                    Statement stmt = conn.createStatement();
211:                    if (dim <= 0) {
212:                        ResultSet rs = stmt
213:                                .executeQuery("select data from images where name = '"
214:                                        + s + "' and maxDim <= 0");
215:                        if (rs.next()) {
216:                            byte[] image = rs.getBytes(1);
217:                            rs.close();
218:                            sendImage(image, response);
219:                        } else {
220:                            rs.close();
221:                            // not found
222:                        }
223:                    } else {
224:                        ResultSet rs = stmt
225:                                .executeQuery("select data from images where name ='"
226:                                        + s + "' and maxDim = " + dim);
227:                        if (rs.next()) {
228:                            byte[] image = rs.getBytes(1);
229:                            rs.close();
230:                            sendImage(image, response);
231:                        } else {
232:                            rs.close();
233:                            rs = stmt
234:                                    .executeQuery("select data, size from images where name = '"
235:                                            + s + "' and maxDim <= 0");
236:                            if (rs.next()) {
237:                                byte[] image = rs.getBytes(1);
238:                                rs.close();
239:                                byte[] resized = resizeImage(image, dim);
240:                                storeImage(conn, resized, s, dim);
241:                                sendImage(resized, response);
242:                            } else {
243:                                // not found
244:                                rs.close();
245:                            }
246:                        }
247:                    }
248:                } catch (Throwable t) {
249:                    throw new ServletException(t);
250:                } finally {
251:                    try {
252:                        conn.close();
253:                    } catch (Throwable t) {
254:                        throw new ServletException(t);
255:                    }
256:                }
257:            }
258:
259:        }
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