Java 实现图片水印之文字水印（SpringMVC + Jsp）

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看之前要先对SpringMVC 有点了解。。。

直接先看效果图

这里写图片描述

代码编写

1.导入相关架包

这里写图片描述

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="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">  <display-name>watermarkspringmvc</display-name>    <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>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-4.0.xsd        http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">    <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></beans>

3.编写action

WatermarkAction .action

package com.wenteryan.watermarkspringmvc;import javax.servlet.http.HttpSession;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.commons.CommonsMultipartFile;import org.springframework.web.servlet.ModelAndView;import com.wenteryan.service.MarkService;import com.wenteryan.service.UploadService;@Controllerpublic class WatermarkAction {    private MarkService mackService  ;    private UploadService uploadService ;    @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 = mackService.watermark(file, uploadPath, realUploadPath) ;        ModelAndView ret = new ModelAndView() ;        ret.addObject("imageUrl", imageUrl) ;        ret.addObject("logoImageUrl", logoImageUrl) ;        ret.setViewName("watermark");        return ret ;    }    @Autowired    public void setMackService(MarkService mackService) {        this.mackService = mackService;    }    @Autowired    public void setUploadService(UploadService uploadService) {        this.uploadService = uploadService;    }}

4.编写服务类

MarkService .java

package com.wenteryan.service;import java.awt.Color;import java.awt.Font;import java.io.File;import org.springframework.web.multipart.commons.CommonsMultipartFile;public interface MarkService {    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 String watermark(CommonsMultipartFile file, String uploadPath,             String realUploadPath) ;    }

5.编写接口实现类

UploadService .java

package com.wenteryan.service.impl;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import org.springframework.stereotype.Service;import org.springframework.web.multipart.commons.CommonsMultipartFile;@Servicepublic 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() ;    }}

MarkServiceImpl .java

package com.wenteryan.service.impl;import java.awt.AlphaComposite;import java.awt.Font;import java.awt.Graphics2D;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import javax.imageio.ImageIO;import org.springframework.stereotype.Service;import org.springframework.web.multipart.commons.CommonsMultipartFile;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;import com.wenteryan.service.MarkService;@Servicepublic class MarkServiceImpl implements MarkService {    @Override    public String watermark(CommonsMultipartFile file, String uploadPath, String realUploadPath) {        // TODO Auto-generated method stub        String logoFileName = "logo"+file.getOriginalFilename()  ;        OutputStream os = null ;        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) ;            g.setFont(new Font(FONT_NAME,FONT_STYPE,FONT_SIZE));            g.setColor(FONT_COLOR) ;            int width1 = FONT_SIZE*getTextLength(MARK_TEXT) ;            int height1 = FONT_SIZE ;            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.drawString(MARK_TEXT, x, y+FONT_SIZE) ;            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;    }    public int getTextLength(String text) {        int length = text.length();        for(int i=0; i<text.length(); i++) {            String s = String.valueOf(text.charAt(i)) ;            if(s.getBytes().length>1) {                length++ ;            }        }        length = length%2==0?length/2:length/2+1 ;        return length ;    }}

6.编写页面
index.jsp

<form action="watermark" method="post" enctype="multipart/form-data">        <h2>请选择上传的图片</h2>        <div class="form-group">        <br>        <input type="file" name="image" id="image" />        </div>        <div class="form-group">        <br>        <button class="btn btn-success" type="submit">开始上传</button>        </div>    </form>

watermark.jsp

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

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。

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