文件上传与图片自动压缩.
本程序只适合gif,jpg,png图片格式. 上传大小不要最好不要超过1M. 程序可对图片进行统一大小压缩. 如让所有上传图
宽度处理成宽度为500像数的图片. 高度可由程序自动设置. 并可对上传图片同进生成缩略图. 如 宽度为了100
为了主程序运行. 需要下载 apache.commons.fileupload 组件. (www.apache.org)
大部分操作以由二个类完成.只要在Jsp或servlet 中加入很少的代码就可以完成工作了.
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<jsp:useBean id="upload" scope="page" class="com.date.myupload"/>
<%
String root_d=request.getRealPath(""); //取得应用目录.
String root_dir=root_d+"/test"; //上传目录.
upload.setTempdir(root_dir); //设置临时目录
upload.setUpsize(4194304); //上传文件大小
upload.setUpbuffer(4096); //缓冲大小
upload.upload(request); //分析请求.
out.print(upload.getFiledvalue("user")); //取得表单值.
out.print("<br>");
upload.setImgproce(true,500,"www.ssmei.com"); //设置图片处理参数. true 为要进行处理. 500为图片外理后的宽度.
//"www.ssmei.com"是在图片上打上签名.
out.print(upload.savaFile("thisfile",root_dir+"/a.jpg")); //保荐文件到服务器上. thisfile是文件表单名字.
//root_dir+"/a.jpg 为路径.
upload.setImgproce(true,100,null); //第二个文或保存为不同大小的图片. 一个文件可多次处理和何保存.
out.print(upload.savaFile("thisfile",root_dir+"/a1.jpg"));
upload.delete();
%>
</body>
</html>
//===================================================
图片压缩类
//===================================================
package com.date;
import java.io.File;
import java.io.FileOutputStream;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.*;
import java.awt.image.BufferedImage;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class imgproce {
private int wideth;
private int height;
private String t=null;
public void setT(String t)
{
this.t=t;
}
public void setWideth(int wideth)
{
this.wideth=wideth;
}
public int getWideth()
{
return this.wideth;
}
public void setHeight(int height)
{
this.height=height;
}
public int getHeight(int w,int h) //former images size
{
int hhh;
if(w > wideth)
{
float ww;
ww = (float) w / (float) wideth;
float hh = h / ww;
return (int) hh;
}
else
{
this.setWideth(w);
return h;
}
}
public void proce(String fpath) throws Exception
{
File _file = new File(fpath);
Image src = javax.imageio.ImageIO.read(_file);
int wideth=src.getWidth(null);
int height=src.getHeight(null);
int h=this.getHeight(wideth,height);
BufferedImage tag = new BufferedImage(this.getWideth(),h,BufferedImage.TYPE_INT_RGB);
Graphics g=tag.getGraphics();
g.drawImage(src, 0, 0, this.getWideth(), h, null);
if(t!=null)
{
g.setColor(new Color(242,242,242));
g.fillRect(this.getWideth() - 120, h - 18,120,18);
g.setColor(new Color(180,180,180));
g.drawRect(this.getWideth() - 120, h - 18,119,17);
g.setColor(new Color(255,102,0));
g.drawString(t, this.getWideth() - 100, h - 5);
}
FileOutputStream out=new FileOutputStream(fpath);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(tag);
out.close();
}
}
//===================================================
文件上传类
//===================================================
package com.date;
import javax.servlet.http.*;
import org.apache.commons.fileupload.*;
import java.util.*;
import java.io.*;
public class myupload {
private DiskFileUpload fu;
private List item;
private imgproce imgpro;
private String t=null;
private boolean proce;
private int w;
public void setImgproce(boolean proce,int w,String t)
{
this.proce=proce;
this.w=w;
this.t=t;
}
public myupload()
{
fu = new DiskFileUpload();
imgpro=new imgproce();
}
public void setUpsize(int size)
{
fu.setSizeMax(size);
}
public void setUpbuffer(int bsize)
{
fu.setSizeThreshold(bsize);
}
public void setTempdir(String dir)
{
fu.setRepositoryPath(dir);
}
public void upload(HttpServletRequest request)
{
try{
item = fu.parseRequest(request);
}
catch(Exception e)
{ System.out.println("upload paser error"); }
}
public String getFiledvalue(String filedname)
{
String value="";
Iterator i = item.iterator();
while(i.hasNext())
{
FileItem fi = (FileItem) i.next();
if (fi.isFormField())
{
if(fi.getFieldName().equals(filedname))
{
value=fi.getString();
}
}
}
return value;
}
public String savaFile(String filedname,String dir)
{
String fname="";
try{
Iterator i = item.iterator();
while (i.hasNext())
{
FileItem fi = (FileItem) i.next();
if (fi.isFormField())
{
}
else
{
if (fi.getFieldName().equals(filedname)&fi.getSize()>0)
{
fi.write(new File(dir));
if(proce)
{
imgpro.setWideth(w);
imgpro.setT(t);
imgpro.proce(dir);
}
}
}
}
}
catch(Exception e)
{ System.out.println("upload sava error!");}
return dir;
}
public void delete() throws Throwable
{
Iterator i = item.iterator();
while(i.hasNext())
{
FileItem fi = (FileItem) i.next();
fi.delete();
}
System.out.println("close upload");
}
}
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