java实现图片上加文字水印（SpringMVC + Jsp）

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

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; i1) {
    length++ ;
   }
  }

  length = length%2==0?length/2:length/2+1 ;
  return length ;
 }

}

6.编写页面
index.jsp

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。

java实现图片上加文字水印（SpringMVC + Jsp）

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