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

watermarkspringmvc

dispatcherServlet

org.springframework.web.servlet.DispatcherServlet

contextConfigLocation

classpath:springmvc.xml

1

dispatcherServlet

/

index.jsp

springmvc.xml

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">

class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

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;

@Controller

public 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;

@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() ;

}

}

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;

@Service

public 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

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

请选择上传的图片

watermark.jsp

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。