java实现将图片和缩略图存储到数据库中

public class PicCreateCtrl extends HttpServlet{
public PicCreateCtrl(){
super();
}
public void destroy(){
super.destroy();//Just puts"destroy"string in log
//Put your code here
}
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
doPost(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
response.setContentType("text/html;charset=gb2312");
PrintWriter out=response.getWriter();
SmartUpload mySmartUpload=new SmartUpload();//creat new SmartUpload object long file_size_max=10000000;//the bigest size of file
String fileExt="";
String url="temp/";//the path of save upload file
mySmartUpload.initialize(this.getServletConfig(),request,response);
try{
mySmartUpload.setAllowedFilesList("png,emf,bmp,jpg,gif,BMP,JPG,GIF,PN G,EMF");
//上载文件
mySmartUpload.upload();
}catch(Exception e){
e.printStackTrace();
out.print("<script language=javascript>");
out.println("alert('只允许上传.png,.emf,.bmp,.jpg,.gif类型的图片文件!');");
out.println("window.location='javascript:history.go(-1)'");
out.print("</script>");
}
try{
BaseduManager manager=new BaseduManager();
File myFile=mySmartUpload.getFiles().getFile(0);
String xh=mySmartUpload.getRequest().getParameter("xcxh");
if(myFile.isMissing()){
out.print("<script language=javascript>");
out.println("alert('请先选择你要上传的图片！');");
out.println("window.location='javascript:history.go(-1)'");
out.print("</script>");
}else{
fileExt=myFile.getFileExt();//取得文件后缀名
int file_size=myFile.getSize();//取得文件的大小
String fileurl="";
if(file_size<file_size_max){
//更改文件名，取得当前上传时间的毫秒数值
String rname=Tools.getSystime().substring(0,8);
String filename=myFile.getFileName();
rname=rname+"_"+filename.substring(0,filename.length()-4);
fileurl+=request.getRealPath("/")+url+rname+"."+fileExt;//图片上传后的路径
java.io.File zp=new java.io.File(fileurl);//读入刚才上传的文件
String newurl=request.getRealPath("/")+url+"/"+rname+"_min."+ fileExt;//新的缩略图保存地址
myFile.saveAs(fileurl,mySmartUpload.SAVE_PHYSICAL);
Image src=javax.imageio.ImageIO.read(zp);//构造Image对象
int new_w=320;
int new_h=200;//得到源图长
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();
java.io.File sltp=new java.io.File(newurl);//读入刚才上传的文件
manager.saveEduPic(zp,sltp,xh);//把照片和缩略图存到数据库中
out.print("<script language=javascript>");
out.print("alert('图片保存成功！');");
out.print("window.location='javascript:history.go(-1)';");
out.print("</SCRIPT>");
}else{
out.print("<script language=javascript>");
out.print("alert('上传文件大小不能超过"+(file_size_max/1000000)+"M');");
out.println("window.location='javascript:history.go(-1)';");
out.print("</SCRIPT>");
}
}
out.close();
out.flush();
}catch(Exception e){
e.printStackTrace();
}
}
public void init()throws ServletException{ }
}。