photoviewservlet.java

JDBC数据库高级编程源代码

package jdbcbook.photo;

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

import jdbcbook.pub.util.*;

/**
 * 显示照片Servlet
 */
public class PhotoViewServlet extends HttpServlet
{

	public void doPost(HttpServletRequest request, HttpServletResponse response)
						throws IOException, ServletException
	{
		// 得到照片的主键值
		int nPhotoID = RequestUtil.getInt( request, "photoid", 0 );

		// 取得照片的信息
		Photo photo = PhotoBean.getPhoto( nPhotoID );
		if( photo!=null && photo.getPhotoid()>0 )
		{
			// 设置ContentType
			response.setContentType( photo.getFiletype() );
			// 输出照片
			PhotoBean.outputFile( response.getOutputStream(), photo.getPhotoid() );
		}
	}

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