我想在JSP页中显示存储在ORACLE数据库中的图片，500分！

Question

回答的各位老大，请来此接分吧，多谢了，其实我是struts的标签库不会，不知道怎么去写那个img，所以只好问了，这个没有水平的问题，谢谢各位的回答，多谢了，其他的几个板块（j2se基础类，j2se扩展类，j2EE，框架开源）里面的已经揭帖了，所以要接分的快啊，我可能这两天就结帖了啊！！

Answer 1

1.<img src="/myWeb/ShowImgServlet?id=123456789">
用上面的字符串显示：/myWeb/ShowImgServlet        是显示图片的servlet 
                    id                           是数据库中图片的id
当然你可以把上面的字符串封装成对象 以<bean:write name="" property=""/>的形式显示
如果有多个图片可以<logic:iterate id="img" name="" property="">
                                <bean:write name="img" property=""/>
　　　　　　　　　</logic:iterate>
具体怎么用标签我就不多说了
2.ShowImgServlet

Answer 2

package com.cpl.servletimport java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.forecast.wp.editor.improve.AttFileDAO;
import com.forecast.wp.editor.improve.AttFileNotFoundException;
import com.forecast.wp.editor.improve.DAOFactory;
import com.forecast.wp.editor.improve.UploadFile;/**
 * @version  1.0
 * @author        cpl
 */
public class ShowAttFileServlet extends HttpServlet implements Servlet { /**
* @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
try {
String fileId = req.getParameter("id");

DAOFactory factory = DAOFactory.getFactory(DAOFactory.ORACLE);
AttFileDAO attFileDAO = factory.getNonJTAAttFileDAO();
UploadFile attFile = attFileDAO.getAttFile(fileId);
String fileName = attFile.getFileName();
String fileType = attFile.getFileType();

long fileSize = attFile.getFileSize();
byte[] fileData = attFileDAO.getAttFileData(fileId);
resp.setContentType(fileType);
resp.setHeader(
"Content-Disposition",
"filename=\"" + fileName + "\"");

ServletOutputStream outStream = resp.getOutputStream();

outStream.write(fileData);
outStream.flush();
outStream.close();

} catch (AttFileNotFoundException e) {
e.printStackTrace();
} } /**
* @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp); }}

Answer 3

3.DAOFactory
/*
 * 创建日期 2005-5-24
 *
 */
package com.forecast.wp.projectmanager;import com.forecast.wp.editor.improve.AttFileDAO;
import com.forecast.wp.projectmanager.impl.OrclDAOFactory;/**
 *
 *  @author cpl
 */
public abstract class DAOFactory {
public static final int ORACLE = 0; public static DAOFactory getDAOFactory(int whichDAO) {
switch (whichDAO) {
case ORACLE :
return new OrclDAOFactory();
default :
return null;
}
}
public abstract ProjectDAO getJTAProjectDAO();
public abstract ProjectDAO getNonJTAProjectDAO();
public abstract ExpenseDAO getJTAExpenseDAO();
public abstract ExpenseDAO getNonJTAExpenseDAO();
public abstract AppendFileDAO getJTAAppendFileDAO();
public abstract AppendFileDAO getNonJTAAppendFileDAO();
public abstract AttFileDAO getJTAAttFileDAO();}