图片上传和上传缩略图

需要Jspsmart.jar包
Upload.html
<table border="0" align="center" cellpadding="0" cellspacing="0"> <tr>
<td height="45" align="center" valign="middle">
<form action="uploadimage.jsp" method="post"
enctype="multipart/form-data" name="form1">
请选择上传的图片
<input type="file" name="file">
<input type="submit" name="Submit" value="上传">
</form></td>
</tr>
</table>
Uploadimage.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ page
import="java.io.*,java.awt.Image,java.awt.image.*,com.sun.image.codec .jpeg.*,
java.sql.*,java.awt.Color,
com.jspsmart.upload.*,
java.util.*"%>
<%@ page import="haobaobao.servlet.WaterMark;"%>
<%
String path = request.getContextPath();
String basePath =
request.getScheme()+"://"+request.getServerName()+":"+request.getServ erPort()+path+"/";
%>
<%
SmartUpload mySmartUpload =new SmartUpload();
long file_size_max=4000000;
String fileName2="",ext="",testvar="";
String url="uploadfile/images/"; //应保证在根目录中有此目录的存在String saveurl="";
//更改文件名，取得当前上传时间的毫秒数值
Calendar calendar = Calendar.getInstance();
String filename = String.valueOf(calendar.getTimeInMillis());
System.out.println(filename);
//初始化
mySmartUpload.initialize(pageContext);
//只允许上载此类文件
try {
mySmartUpload.setAllowedFilesList("jpg,gif");
//上载文件
mySmartUpload.upload();
} catch (Exception e){
%>
<SCRIPT language=javascript>
alert("只允许上传.jpg和.gif类型图片文件");
window.location=''upfile.jsp'';
</script>
<%
}
try{
com.jspsmart.upload.File myFile =
mySmartUpload.getFiles().getFile(0);
if (myFile.isMissing()){%>
<SCRIPT language=javascript>
alert("请先选择要上传的文件");
window.location=''upfile.jsp'';
</script>
<%}
else{
// String myFileName=myFile.getFileName(); //取得上载的文件的文件名 ext= myFile.getFileExt(); //取得后缀名
int file_size=myFile.getSize(); //取得文件的大小
if(file_size<file_size_max){
saveurl=request.getRealPath("/")+url;
saveurl+=filename+"."+ext; //保存路径
myFile.saveAs(saveurl,mySmartUpload.SAVE_PHYSICAL);
//WaterMark wm = new WaterMark();
//wm.createMark(saveurl, "韩坤 ", Color.red, 70f, "黑体 ",23);
//-----------------------上传完成，开始生成缩略图
-------------------------
// java.io.File file = new java.io.File(saveurl); //读入刚才上传的文件
// String
newurl=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=200;
// 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;
// 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
// 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();
}else{
out.print("<SCRIPT language=''javascript''>");
out.print("alert(''上传文件大小不能超过
"+(file_size_max/1000)+"K'');");
out.print("window.location=''upfile.jsp;''");
out.print("</SCRIPT>");
}
}
}catch (Exception e){
e.toString();
}
System.out.println("图片相对路径："+url+filename+"."+ext); %>。