1.負責處理圖處的bean:
//---------------------------------------------------------------
package bean;
import javax.imageio.ImageIO;
import javax.imageio.IIOException;
import java.awt.image.BufferedImage;
import java.awt.Image;
import java.io.File;
import java.awt.image.AffineTransformOp;
import java.awt.geom.AffineTransform;
public class convertImage {
private String fileInput ;
private String fileOutput ;
public convertImage()
{
}
public String getFileInput() {
return fileInput;
}
public void setFileInput(String fileInput) {
this.fileInput = fileInput;
}
public String getFileOutput() {
return fileOutput;
}
public void setFileOutput(String fileOutput) {
this.fileOutput = fileOutput;
}
public void convert()
{
try {
File fi = new File(fileInput); //大圖文件
File fo = new File(fileOutput); //將要轉換出的小圖文件
int nw = 150; //定義寬為150
int nh = 100; //定義高為100
AffineTransform transform = new AffineTransform();
BufferedImage bis = ImageIO.read(fi);
int w = bis.getWidth();
int h = bis.getHeight();
double sx = (double)nw/w;
double sy = (double)nh/h ;
//判斷是橫向圖形還是堅向圖形
if ( w > h ) //橫向圖形
{
if ( (int)(sx * h ) > nh ) //比較高不符合高度要求,就按高度比例
{
sx = sy ;
nw = (int)(w*sx) ;
}
else
{
sy = sx ;
nh = (int)( h*sy) ;
}
}
else
{
if ( (int)(sy * w ) > nw )
{
sy = sx ;
nh = (int)(h * sy ) ;
}
else
{
sx = sy ;
nw = (int)(w*sx) ;
}
}
transform.setToScale(sx,sy);
AffineTransformOp ato = new AffineTransformOp(transform,null);
BufferedImage bid = new BufferedImage(nw,nh,BufferedImage.TYPE_3BYTE_BGR);
ato.filter(bis,bid);
ImageIO.write(bid,"jpeg",fo);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
2.上傳文件的upload.jsp
--------------------------------------------------------------------
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'upload.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<html:form action="/upload.do" enctype="multipart/form-data">
<html:file property="theFileone"/>
<html:submit/>
</html:form>
</body>
</html>
//------------------------------------------------------------------------
3.顯示成功頁面
//------------------------------------------------------------------------
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page contentType="text/html;charset=GB2312" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'display.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
上傳成功. <br>
</body>
</html>
//---------------------------------------------------------------------
4.Action
//Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_4.1.1/xslt/JavaClass.xsl
package com.mk.struts.action;
import java.io.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;
import com.mk.struts.form.UploadForm;
import bean.convertImage;
/**
* MyEclipse Struts
* Creation date: 03-28-2006
*
* XDoclet definition:
* @struts.action validate="true"
*/
public class UploadAction extends Action {
// --------------------------------------------------------- Instance Variables
// --------------------------------------------------------- Methods
/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
// TODO Auto-generated method stub
String encoding = request.getCharacterEncoding() ;
if ( (encoding != null )&& (encoding.equalsIgnoreCase("uft-8")))
{
response.setContentType("text/html;charset=gb2312") ; //如果沒有找定編碼，編碼格式設為gb2312
}
UploadForm theForm = (UploadForm) form ;
FormFile fileone = theForm.getTheFileone() ; //取得上傳的文件名
try
{
//開始上傳文件
String filePath = this.getServlet().getServletContext().getRealPath("/") ; //取得當前路徑
InputStream stream = fileone.getInputStream() ; //把文件讀入
ByteArrayOutputStream baos = new ByteArrayOutputStream() ;
/*
* 建立一個上傳文件的輸出流如果是linux系統請把"\\" 換成 "/"
*/
OutputStream bos = new FileOutputStream(filePath + fileone.getFileName()) ;
request.setAttribute("fileName",filePath + "/" + fileone.getFileName() ) ;
int bytesRead = 0 ;
byte[] buffer = new byte[8192] ;
while( (bytesRead = stream.read(buffer,0,8192) ) != -1 )
{
bos.write(buffer,0,bytesRead) ;
}
bos.close();
stream.close() ;
//上傳文件完成
String oldurl= filePath + fileone.getFileName() ;
String newurl= filePath + "min_" + fileone.getFileName() ; //新的縮略圖保存地址
convertImage convert = new convertImage() ;
convert.setFileInput(oldurl) ;
convert.setFileOutput(newurl) ;
convert.convert() ;
}
catch(Exception e)
{
System.err.print(e) ;
}
return mapping.findForward("display");
}
}
來源:http://www.ideagrace.com/html/doc/2006/04/21/00776.html