图片自动加水印

 1 package cn.tfri.filter.watermark;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.Filter;
 6 import javax.servlet.FilterChain;
 7 import javax.servlet.FilterConfig;
 8 import javax.servlet.ServletException;
 9 import javax.servlet.ServletRequest;
10 import javax.servlet.ServletResponse;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13 
14 public class WaterMarkFilter implements Filter{
15     
16     private boolean enabled;
17     private String waterMarkFile;
18     
19     public boolean isEnabled() {
20         return enabled;
21     }
22     public void setEnabled(boolean enabled) {
23         this.enabled = enabled;
24     }
25     public String getWaterMarkFile() {
26         return waterMarkFile;
27     }
28     public void setWaterMarkFile(String waterMarkFile) {
29         this.waterMarkFile = waterMarkFile;
30     }
31 
32     public void destroy() {}
33 
34     public void doFilter(ServletRequest req, ServletResponse resp,
35             FilterChain chain) throws IOException, ServletException {
36         HttpServletRequest request = (HttpServletRequest)req;
37         HttpServletResponse response = (HttpServletResponse)resp;
38         if(this.isEnabled()){
39             WaterMarkResponseWrapper waterMarkRes = new WaterMarkResponseWrapper(response,this.getWaterMarkFile());
40             chain.doFilter(request, waterMarkRes);
41             waterMarkRes.finishResponse();
42         }
43         chain.doFilter(request, response);
44     }
45 
46     public void init(FilterConfig filterConfig) throws ServletException {
47         this.setEnabled("true".equalsIgnoreCase(filterConfig.getInitParameter("enabled").trim()));
48         String file = filterConfig.getInitParameter("waterMarkFile");
49         this.setWaterMarkFile(filterConfig.getServletContext().getRealPath(file));
50     }
51     
52 }

 1 package cn.tfri.filter.watermark;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletOutputStream;
 6 import javax.servlet.http.HttpServletResponse;
 7 import javax.servlet.http.HttpServletResponseWrapper;
 8 
 9 import cn.tfri.hibernate.utils.ImageUtil;
10 
11 public class WaterMarkResponseWrapper extends HttpServletResponseWrapper{
12     private String waterMarkFile;
13     private HttpServletResponse response;
14     private WaterMarkOutputStream waterMarkOutputStream = new WaterMarkOutputStream();
15     
16     public String getWaterMarkFile() {
17         return waterMarkFile;
18     }
19     public void setWaterMarkFile(String waterMarkFile) {
20         this.waterMarkFile = waterMarkFile;
21     }
22     public HttpServletResponse getResponse() {
23         return response;
24     }
25     public void setResponse(HttpServletResponse response) {
26         this.response = response;
27     }
28     public WaterMarkOutputStream getWaterMarkOutputStream() {
29         return waterMarkOutputStream;
30     }
31     public void setWaterMarkOutputStream(WaterMarkOutputStream waterMarkOutputStream) {
32         this.waterMarkOutputStream = waterMarkOutputStream;
33     }
34     
35     public WaterMarkResponseWrapper(HttpServletResponse response,String waterMarkFile){
36         super(response);
37         this.setResponse(response);
38         this.setWaterMarkFile(waterMarkFile);
39     }
40     
41     public ServletOutputStream getOutputStream(){
42         return this.getWaterMarkOutputStream();
43     }
44     @Override
45     public void flushBuffer() throws IOException {
46         this.getWaterMarkOutputStream().flush();
47     }
48     
49     public void finishResponse() throws IOException{
50         byte[] imageData = this.getWaterMarkOutputStream().getByteArrayOutputStream().toByteArray();
51         byte[] image = ImageUtil.waterMark(imageData, this.getWaterMarkFile());
52         response.setContentLength(image.length);
53         response.getOutputStream().write(image);
54         this.getWaterMarkOutputStream().close();
55     }
56 }

 1 package cn.tfri.filter.watermark;
 2 
 3 import java.io.ByteArrayOutputStream;
 4 import java.io.IOException;
 5 
 6 import javax.servlet.ServletOutputStream;
 7 
 8 public class WaterMarkOutputStream extends ServletOutputStream{
 9     private ByteArrayOutputStream byteArrayOutputStream;
10     
11     public ByteArrayOutputStream getByteArrayOutputStream() {
12         return byteArrayOutputStream;
13     }
14     public void setByteArrayOutputStream(ByteArrayOutputStream byteArrayOutputStream) {
15         this.byteArrayOutputStream = byteArrayOutputStream;
16     }
17     
18     public WaterMarkOutputStream(){
19         this.setByteArrayOutputStream(new ByteArrayOutputStream());
20     }
21     
22     @Override
23     public void write(int b) throws IOException {
24         this.getByteArrayOutputStream().write(b);
25     }
26     @Override
27     public void close() throws IOException {
28         this.getByteArrayOutputStream().close();
29     }
30     @Override
31     public void flush() throws IOException {
32         this.getByteArrayOutputStream().flush();
33     }
34     @Override
35     public void write(byte[] b, int off, int len) throws IOException {
36         this.getByteArrayOutputStream().write(b, off, len);
37     }
38     @Override
39     public void write(byte[] b) throws IOException {
40         this.getByteArrayOutputStream().write(b);
41     }
42 }

 1 package cn.tfri.hibernate.utils;
 2 
 3 import java.awt.Color;
 4 import java.awt.Font;
 5 import java.awt.Graphics;
 6 import java.awt.Image;

 7 import java.awt.image.BufferedImage;
 8 import java.io.ByteArrayOutputStream;
 9 import java.io.File;
10 import java.io.IOException;
11 
12 import javax.imageio.ImageIO;
13 import javax.swing.ImageIcon;
14 
15 import com.sun.image.codec.jpeg.JPEGCodec;
16 import com.sun.image.codec.jpeg.JPEGImageEncoder;
17 
18 public class ImageUtil {
19     public static byte[] waterMark(byte[] imageData,String waterMarkFiler) throws IOException{
20         int paddingRight = 10;
21         int paddingBottom = 10;
22         
23         Image image = new ImageIcon(imageData).getImage();
24         int imageWidth = image.getWidth(null);
25         int imageHeight = image.getHeight(null);
26         
27         Image waterMark = ImageIO.read(new File(waterMarkFiler));
28         int waterMarkWidth = waterMark.getWidth(null);
29         int waterMarkHeight = waterMark.getHeight(null);
30         
31         if(imageWidth < waterMarkWidth + 2*paddingRight || imageHeight < waterMarkHeight + 2*paddingBottom){
32             return imageData;
33         }
34         
35         BufferedImage bufferedImage = new BufferedImage(imageWidth,imageHeight,BufferedImage.TYPE_INT_RGB);
36         Graphics g = bufferedImage.createGraphics();
37         g.drawImage(image, 0, 0, imageWidth, imageHeight, null);
38         g.drawImage(waterMark,imageWidth - waterMarkWidth - paddingRight,imageHeight - waterMarkHeight - paddingBottom,waterMarkWidth,waterMarkHeight,null);
39         //设置图形上下文的当前颜色为红色
40         g.setColor(Color.red);
41         //创建新的字体
42         Font font = new Font("华文行楷",Font.BOLD,12);
43         //设置图形上下文的字体为指定字体
44         g.setFont(font);
45         //在图片上绘制文字，文字的颜色为图形上下文的当前颜色，即红色
46         g.drawString("上海烛龙-古剑奇谭", imageWidth - 200, imageHeight - 200);
47         g.dispose();
48         
49         ByteArrayOutputStream out = new ByteArrayOutputStream();
50         JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
51         encoder.encode(bufferedImage);
52                 
53         byte[] data = out.toByteArray();
54         out.close();
55         return data;
56     }
57 }