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java实现图片上加文字水印（SpringMVC + Jsp）

2016-7-29 15:34| 发布者: zhangjf| 查看: 745| 评论: 0

摘要: 看之前要先对SpringMVC进行了解打好基础，下面直接先看效果图 代码编写 1.导入相关架包 2.配置文件 web.xml ?xml version=1.0 encoding=UTF-8?web-app xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xmlns ...

看之前要先对SpringMVC进行了解打好基础，下面直接先看效果图

代码编写

1.导入相关架包

2.配置文件

web.xml

  2. <?xml version="1.0" encoding="UTF-8"?>
  3. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  4. <display-name>watermarkspringmvc</display-name>
  5. <servlet>
  6. <servlet-name>dispatcherServlet</servlet-name>
  7. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  8. <init-param>
  9. <param-name>contextConfigLocation</param-name>
  10. <param-value>classpath:springmvc.xml</param-value>
  11. </init-param>
  12. <load-on-startup>1</load-on-startup>
  13. </servlet>
  15. <servlet-mapping>
  16. <servlet-name>dispatcherServlet</servlet-name>
  17. <url-pattern>/</url-pattern>
  18. </servlet-mapping>
  19. <welcome-file-list>
  20. <welcome-file>index.jsp</welcome-file>
  21. </welcome-file-list>
  22. </web-app>
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springmvc.xml

  2. <?xml version="1.0" encoding="UTF-8"?>
  3. <beans xmlns="http://www.springframework.org/schema/beans"
  4. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
  5. xmlns:mvc="http://www.springframework.org/schema/mvc"
  6. xsi:schemaLocation="http://www.springframework.org/schema/beans
  7. http://www.springframework.org/schema/beans/spring-beans.xsd
  8. http://www.springframework.org/schema/context
  9. http://www.springframework.org/schema/context/spring-context-4.0.xsd
  10. http://www.springframework.org/schema/mvc
  11. http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
  13. <mvc:default-servlet-handler/>
  14. <mvc:annotation-driven/>
  15. <context:component-scan base-package="com.wenteryan"></context:component-scan>
  16. <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  17. <property name="prefix" value="/"></property>
  18. <property name="suffix" value=".jsp"></property>
  19. <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
  20. </bean>
  22. <bean id="multipartResolver"
  23. class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
  24. <property name="defaultEncoding" value="UTF-8"></property>
  25. <property name="maxUploadSize" value="10485760000"></property>
  26. <property name="maxInMemorySize" value="40960"></property>
  27. </bean>
  29. </beans>
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3.编写action

WatermarkAction .action

  2. package com.wenteryan.watermarkspringmvc;
  4. import javax.servlet.http.HttpSession;
  6. import org.springframework.beans.factory.annotation.Autowired;
  7. import org.springframework.stereotype.Controller;
  8. import org.springframework.web.bind.annotation.RequestMapping;
  9. import org.springframework.web.bind.annotation.RequestMethod;
  10. import org.springframework.web.bind.annotation.RequestParam;
  11. import org.springframework.web.multipart.commons.CommonsMultipartFile;
  12. import org.springframework.web.servlet.ModelAndView;
  14. import com.wenteryan.service.MarkService;
  15. import com.wenteryan.service.UploadService;
  17. @Controller
  18. public class WatermarkAction {
  20. private MarkService mackService ;
  21. private UploadService uploadService ;
  23. @RequestMapping(value="/watermark", method=RequestMethod.POST)
  24. public ModelAndView watermark(
  25. @RequestParam("image")CommonsMultipartFile file, HttpSession session) throws Exception {
  26. String uploadPath = "/images" ;
  27. String realUploadPath = session.getServletContext().getRealPath(uploadPath) ;
  28. String imageUrl = uploadService.uploadImage(file, uploadPath, realUploadPath) ;
  29. String logoImageUrl = mackService.watermark(file, uploadPath, realUploadPath) ;
  30. ModelAndView ret = new ModelAndView() ;
  31. ret.addObject("imageUrl", imageUrl) ;
  32. ret.addObject("logoImageUrl", logoImageUrl) ;
  33. ret.setViewName("watermark");
  35. return ret ;
  36. }
  38. @Autowired
  39. public void setMackService(MarkService mackService) {
  40. this.mackService = mackService;
  41. }
  42. @Autowired
  43. public void setUploadService(UploadService uploadService) {
  44. this.uploadService = uploadService;
  45. }
  48. }
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4.编写服务类

MarkService .java

  2. package com.wenteryan.service;
  3. import java.awt.Color;
  4. import java.awt.Font;
  5. import java.io.File;
  7. import org.springframework.web.multipart.commons.CommonsMultipartFile;
  9. public interface MarkService {
  11. public static final String MARK_TEXT = "wenteryan" ;
  12. public static final String FONT_NAME = "微软雅黑" ;
  14. public static final int FONT_SIZE = 120 ;
  15. public static final int FONT_STYPE = Font.BOLD ;
  16. public static final Color FONT_COLOR = Color.RED ;
  18. public static final int X = 10 ;
  19. public static final int Y = 10 ;
  21. public static float ALPHA = 0.3F ;
  23. public String watermark(CommonsMultipartFile file, String uploadPath,
  24. String realUploadPath) ;
  26. }
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5.编写接口实现类

UploadService .java

  2. package com.wenteryan.service.impl;
  4. import java.io.FileOutputStream;
  5. import java.io.IOException;
  6. import java.io.InputStream;
  7. import java.io.OutputStream;
  9. import org.springframework.stereotype.Service;
  10. import org.springframework.web.multipart.commons.CommonsMultipartFile;
  12. @Service
  13. public class UploadService {
  15. public String uploadImage(CommonsMultipartFile file, String uploadPath, String realUploadPath) {
  16. InputStream is = null ;
  17. OutputStream os = null ;
  19. try {
  21. is = file.getInputStream() ;
  22. os = new FileOutputStream(realUploadPath+"/"+file.getOriginalFilename()) ;
  24. byte[] buffer = new byte[1024] ;
  25. int len = 0 ;
  27. while((len=is.read(buffer))>0) {
  28. os.write(buffer) ;
  29. }
  31. } catch(Exception e) {
  32. e.printStackTrace() ;
  33. } finally {
  34. if(is!=null) {
  35. try {
  36. is.close();
  37. } catch (IOException e) {
  38. // TODO Auto-generated catch block
  39. e.printStackTrace();
  40. }
  41. }
  42. if(os!=null) {
  43. try {
  44. os.close();
  45. } catch (IOException e) {
  46. // TODO Auto-generated catch block
  47. e.printStackTrace();
  48. }
  49. }
  50. }
  52. return uploadPath+"/"+file.getOriginalFilename() ;
  53. }
  54. }
复制代码

MarkServiceImpl .java

  2. package com.wenteryan.service.impl;
  4. import java.awt.AlphaComposite;
  5. import java.awt.Font;
  6. import java.awt.Graphics2D;
  7. import java.awt.Image;
  8. import java.awt.image.BufferedImage;
  9. import java.io.File;
  10. import java.io.FileOutputStream;
  11. import java.io.IOException;
  12. import java.io.InputStream;
  13. import java.io.OutputStream;
  15. import javax.imageio.ImageIO;
  17. import org.springframework.stereotype.Service;
  18. import org.springframework.web.multipart.commons.CommonsMultipartFile;
  20. import com.sun.image.codec.jpeg.JPEGCodec;
  21. import com.sun.image.codec.jpeg.JPEGImageEncoder;
  22. import com.wenteryan.service.MarkService;
  24. @Service
  25. public class MarkServiceImpl implements MarkService {
  27. @Override
  28. public String watermark(CommonsMultipartFile file, String uploadPath, String realUploadPath) {
  29. // TODO Auto-generated method stub
  31. String logoFileName = "logo"+file.getOriginalFilename() ;
  32. OutputStream os = null ;
  33. try {
  34. Image image2 = ImageIO.read(file.getInputStream()) ;
  36. int width = image2.getWidth(null) ;
  37. int height = image2.getHeight(null) ;
  39. BufferedImage bufferImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB) ;
  41. Graphics2D g = bufferImage.createGraphics() ;
  42. g.drawImage(image2, 0, 0, width, height, null) ;
  44. g.setFont(new Font(FONT_NAME,FONT_STYPE,FONT_SIZE));
  45. g.setColor(FONT_COLOR) ;
  47. int width1 = FONT_SIZE*getTextLength(MARK_TEXT) ;
  48. int height1 = FONT_SIZE ;
  50. int widthDiff = width-width1 ;
  51. int heightDiff = height-height1 ;
  53. int x = X ;
  54. int y = Y ;
  56. if(x>widthDiff) {
  57. x = widthDiff ;
  58. }
  60. if(y>heightDiff) {
  61. y=heightDiff ;
  62. }
  64. g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, ALPHA));
  66. g.drawString(MARK_TEXT, x, y+FONT_SIZE) ;
  67. g.dispose() ;
  69. os = new FileOutputStream(realUploadPath+"/"+logoFileName) ;
  70. JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os) ;
  71. en.encode(bufferImage) ;
  73. } catch(Exception e) {
  74. e.printStackTrace() ;
  75. } finally {
  76. if(os!=null) {
  77. try {
  78. os.close();
  79. } catch (IOException e) {
  80. // TODO Auto-generated catch block
  81. e.printStackTrace();
  82. }
  83. }
  84. }
  86. return uploadPath+"/"+logoFileName;
  87. }
  89. public int getTextLength(String text) {
  90. int length = text.length();
  92. for(int i=0; i<text.length(); i++) {
  93. String s = String.valueOf(text.charAt(i)) ;
  94. if(s.getBytes().length>1) {
  95. length++ ;
  96. }
  97. }
  99. length = length%2==0?length/2:length/2+1 ;
  100. return length ;
  101. }
  103. }
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6.编写页面
index.jsp

  2. <form action="watermark" method="post" enctype="multipart/form-data">
  3. <h2>请选择上传的图片</h2>
  4. <div class="form-group">
  5. <br>
  6. <input type="file" name="image" id="image" />
  7. </div>
  8. <div class="form-group">
  9. <br>
  10. <button class="btn btn-success" type="submit">开始上传</button>
  11. </div>
  12. </form>
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watermark.jsp

  2. <div class="panel-body">
  3. <img class="img-responsive img-rounded" src="${pageContext.request.contextPath}${imageUrl }"/>
  5. <img class="img-responsive img-rounded" src="${pageContext.request.contextPath}${logoImageUrl }"/>
  6. <a class="btn btn-warning" href="${pageContext.request.contextPath }">返回</a>
  8. </div>
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总结

Java有专门Image的处理包，同样应该可以实现水印功能，查了资料小试下来发现java实现水印还是非常方便的，水印可以是图片或者文字，后期会有水印图片水印，以后有需要可以写个代码批量处理自己的图片了。

以上就是本文的全部内容，希望对大家学习java程序设计有所帮助。

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