photoupdateservlet.java

一些数据库的java开发编程

package jdbcbook.photo;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

import org.apache.commons.fileupload.*;
import org.apache.commons.beanutils.*;

import jdbcbook.pub.util.*;

public class PhotoUpdateServlet extends HttpServlet
{

	public void doPost(HttpServletRequest request, HttpServletResponse response)
						throws IOException, ServletException
	{
		try
		{

			DiskFileUpload fu = new DiskFileUpload();
			// maximum size before a FileUploadException will be thrown
			// 指定用户可以上传的文件的最大大小（单位：字节）
			fu.setSizeMax( 1000000 );
			// 在内存中保存文件的最大的容量
			fu.setSizeThreshold( 4096 );
			// 超出getSizeThreshold()函数返回值大小的文件的保存位置
			fu.setRepositoryPath("C:\\");
		
			// 取得参数的列表
			List fileItems = fu.parseRequest( request );
			Iterator i = fileItems.iterator();
			Hashtable ht = new Hashtable();
			InputStream in = null;
			int size = 0;
			while( i.hasNext() )
			{
				FileItem fi = (FileItem)i.next();
				// 判断参数的类型
				if( fi.isFormField() )
					ht.put( fi.getFieldName(), fi.getString() );
				else
				{
					in = fi.getInputStream();
					size = (int)fi.getSize();
					if( in!=null && size > 0 )
					{
						ht.put( "filetype", fi.getContentType() );
						ht.put( "filename", StringUtil.getFileName( fi.getName() ) );
					}
				}
			}

			// 生成Photo对象
			Photo photo = new Photo();
			// 给photo对象赋值
			BeanUtils.populate( photo, ht );
			String updateresult = "photoupdatein";
			// 判断是否为修改照片
			if( photo.getPhotoid() > 0 && in!=null && size>0 )
			{
				updateresult = "photoupdatesuccess.vm";
			}

			// 记录照片信息
			boolean result = PhotoBean.updatePhoto( photo, in, size );
			if( result )
				RequestUtil.setMsg( this, request, "updatephotosuccess" );
			else
				RequestUtil.setMsg( this, request, "updatephotofailure" );

			// 跳转到结果页面
			RequestDispatcher dispatcher = request.getRequestDispatcher( updateresult );
			dispatcher.forward( request, response );
		}
		catch( Exception ex )
		{
			ex.printStackTrace( System.err );
		}
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
						throws IOException, ServletException
	{
		doPost( request, response );
	}
}