在jsp中生成图片缩略图的代码
发布时间：2023-05-24 13:47:40 所属栏目：教程 来源：
导读：<%@ page contenttype="text/html;charset=gb2312" %>
<%@ page language="java" import="java.util.*" %>
<%@ page language="java" import="java.io.*" %>
<%@ page language="j
<%@ page language="java" import="java.util.*" %>
<%@ page language="java" import="java.io.*" %>
<%@ page language="j
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<%@ 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> （编辑：聊城站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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