java實現圖片上加文字浮水印（SpringMVC + Jsp）_java

看之前要先對SpringMVC進行瞭解打好基礎，下面直接先看效果圖

代碼編寫

1.匯入相關架包

2.設定檔

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.編寫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.編寫服務類

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 = "微軟雅黑" ; 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.編寫介面實作類別

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.編寫頁面
index.jsp

<form action="watermark" method="post" enctype="multipart/form-data">  <h2>請選擇上傳的圖片</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">開始上傳</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>

總結

Java有專門Image的處理包，同樣應該可以實現浮水印功能，查了資料小試下來發現java實現浮水印還是非常方便的，浮水印可以是圖片或者文字，後期會有浮水印圖片浮水印，以後有需要可以寫個代碼批量處理自己的圖片了。

以上就是本文的全部內容，希望對大家學習java程式設計有所協助。