Java 实现图片水印之水印图片（SpringMVC + Jsp）

小灰灰 2022-08-22 01:20 431阅读 0赞

> 图片水印不仅水印文字还可以是图片，本次实现图片水印之水印图片，以后有需要可以用个代码批量处理自己的图片了。

#### **大家先看效果图** ####

![这里写图片描述][20160510130500956]

![这里写图片描述][20160510130508648]

![这里写图片描述][20160510130518097]

#### **代码编写** ####

**1.导入相关架包**

![这里写图片描述][20160510130443960]

**2.配置XML文件**  
**web.xml**

<servlet>
            <servlet-name>dispatcherServlet</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springmvc.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
    
        <servlet-mapping>
            <servlet-name>dispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>

**springmvc.xml**

<mvc:default-servlet-handler/>
        <mvc:annotation-driven/>    
        <context:component-scan base-package="com.wenteryan"></context:component-scan>
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/"></property>
            <property name="suffix" value=".jsp"></property>
            <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        </bean>
    
        <bean id="multipartResolver" 
                class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <property name="defaultEncoding" value="UTF-8"></property>
            <property name="maxUploadSize" value="10485760000"></property>
            <property name="maxInMemorySize" value="40960"></property>
        </bean>

**3.编写服务类接口**

**ImageMarkService.java**

public static final String LOGO = "logo.png" ;
    
        public String watermark(CommonsMultipartFile file, String uploadPath, 
                String realUploadPath) ;

**4.编写服务类实现**

**UploadService.java**

@Service
    public class UploadService {
    
        public String uploadImage(CommonsMultipartFile file, String uploadPath, String realUploadPath) {
            InputStream is = null ;
            OutputStream os = null ;
    
            try {
    
                is = file.getInputStream() ;
                os = new FileOutputStream(realUploadPath+"/"+file.getOriginalFilename()) ;
    
                byte[] buffer = new byte[1024] ;
                int len = 0 ;
    
                while((len=is.read(buffer))>0) {
                    os.write(buffer) ;
                }
    
            } catch(Exception e) {
                e.printStackTrace() ;
            } finally {
                if(is!=null) {
                    try {
                        is.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
                if(os!=null) {
                    try {
                        os.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
    
            return uploadPath+"/"+file.getOriginalFilename() ;
        }
    }

**ImageMarkService .java**

public interface ImageMarkService { 
    
        public static final String MARK_TEXT = "wenteryan" ;
        public static final String FONT_NAME = "微软雅黑" ;
    
        public static final int FONT_SIZE = 120 ;
        public static final int FONT_STYPE = Font.BOLD ;
        public static final Color FONT_COLOR = Color.RED ;
    
        public static final int X = 10 ;
        public static final int Y = 10 ;
    
        public static float ALPHA = 0.3F ;
    
        public static final String LOGO = "logo.png" ;
    
        public String watermark(CommonsMultipartFile file, String uploadPath, 
                String realUploadPath) ;    
    
    }

**ImageMarkServiceImpl.java**

@Service
    public class ImageMarkServiceImpl implements ImageMarkService { 
    
        @Override
        public String watermark(CommonsMultipartFile file, String uploadPath, String realUploadPath) {
            // TODO Auto-generated method stub
            String logoFileName = "logoImage"+file.getOriginalFilename() ;
            OutputStream os = null ;
    
            String logoPath = realUploadPath+"/"+LOGO ;
            try {
                Image image2 = ImageIO.read(file.getInputStream()) ;
    
                int width = image2.getWidth(null) ;
                int height = image2.getHeight(null) ;
    
                BufferedImage bufferImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB) ;
    
                Graphics2D g = bufferImage.createGraphics() ;
                g.drawImage(image2, 0, 0, width, height, null) ;
    
                File logo = new File(logoPath) ;
                Image imageLogo = ImageIO.read(logo) ;
    
                int width1 = imageLogo.getWidth(null) ;
                int height1 = imageLogo.getHeight(null) ;
    
                int widthDiff = width-width1 ;
                int heightDiff = height-height1 ;
    
                int x = X ;
                int y = Y ;
    
                if(x>widthDiff) {
                    x = widthDiff ;
                }
    
                if(y>heightDiff) {
                    y=heightDiff ;
                }
    
                g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, ALPHA));
    
                g.drawImage(imageLogo, x, y, null) ;
                g.dispose() ;
    
                os = new FileOutputStream(realUploadPath+"/"+logoFileName) ;
                JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os) ;
                en.encode(bufferImage) ;
    
            } catch(Exception e) {
                e.printStackTrace() ;
            } finally {
                if(os!=null) {
                    try {
                        os.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
    
            return uploadPath+"/"+logoFileName;
        }
    
    }

**5.编写Action**

**WaterMarkAction.java**

@RequestMapping(value="/watermark", method=RequestMethod.POST)
        public ModelAndView watermark(
                @RequestParam("image")CommonsMultipartFile file, HttpSession session) throws Exception {
            String uploadPath = "/images" ;
            String realUploadPath = session.getServletContext().getRealPath(uploadPath) ;
            String imageUrl = uploadService.uploadImage(file, uploadPath, realUploadPath) ;
            String logoImageUrl = imageMarkService.watermark(file, uploadPath, realUploadPath) ;
    
            ModelAndView ret = new ModelAndView() ;
            ret.addObject("imageUrl", imageUrl) ;
            ret.addObject("logoImageUrl", logoImageUrl) ;
    
            ret.setViewName("watermark");
    
            return ret ;
        }

**6.编写页面**

**watermark.jsp**

#### **总结** ####

> Java实现水印还是非常方便的，会了水印图片与水印文字，以后有需要可以用这个代码批量处理自己的图片了。棒棒的！！！！！！

[20160510130500956]: /images/20220724/65ae0cb8d84c47ec8b389615870c5412.png
[20160510130508648]: /images/20220724/0b907bafa9fa4bf494789c7b9d25126f.png
[20160510130518097]: /images/20220724/67730e3a99334af68e2060ffd62ae87c.png
[20160510130443960]: /images/20220724/75fc7b8e3481460ab645815470945f7b.png