开发学院WEB开发Jsp jsp中生成图片缩略图的代码 阅读

jsp中生成图片缩略图的代码

 2007-01-23 16:38:42 来源:WEB开发网   
核心提示:<%@ page contentType="text/html;charset=gb2312" %><%@ page language="java" import="java.util.*" %><%@ page language

<%@ page contentType="text/html;charset=gb2312" %>
<%@ page language="java" import="java.util.*" %>
<%@ page language="java" import="java.io.*" %>
<%@ page language="java" import="java.awt.*" %>
<%@ page language="java" import="java.awt.image.*" %>
<%@ page language="java" import="com.sun.image.codec.jpeg.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title> </title>
  <meta name="generator" content="editplus" />
  <meta name="author" content="Wang Shiqiang" />
  <meta name="keyWords" content="Wang Shiqiang" />
  <meta name="description" content="" />
</head>

<body>
 <%
   response.setContentType("text/html;charset=gb2312");
   request.setCharacterEncoding("gb2312");

   out.PRint("==================Test for thumbtail picture=============");

   //-----------------------上传完成,开始生成缩略图------------------------- 
   java.io.File file = new java.io.File("E:\\1110168154_58348.jpg");//saveurl);     //读入刚才上传的文件
   String newurl="E:\\1110168154_58348_min.jpg";//request.getRealPath("/")+url+filename+"_min."+ext;  //新的缩略图保存地址
   Image src = javax.imageio.ImageIO.read(file);           //构造Image对象
   float tagsize=287;
   int old_w=src.getWidth(null);                   //得到源图宽
   int old_h=src.getHeight(null); 
   int new_w=0;
   int new_h=0;               //得到源图长
   int tempsize;
   out.print("<br/>the old width is :"+old_w+" the old height is "+old_h+"<br/>");
   float tempdouble;
   if(old_w>old_h){
   tempdouble=old_w/tagsize;
   }else{
   tempdouble=old_h/tagsize;
   }
   new_w=Math.round(old_w/tempdouble);
   new_h=Math.round(old_h/tempdouble);//计算新图长宽
   out.print("the new width is :"+new_w+" the new height is "+new_h+"<br/>");
   BufferedImage tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
   tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);    //绘制缩小后的图
   FileOutputStream newimage=new FileOutputStream(newurl);      //输出到文件流
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);   
   encoder.encode(tag);                        //近JPEG编码
   newimage.close(); 
   /*
   */
%>
</body>
</html>

Tags:jsp 生成 图片

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