showimage.java

一个信息发布系统 基于jsp+servlet+tomcat 用户分管理员跟普通用户 普通用户有发布信息 查询信息 修改信息 回复信息 管理员拥有普通用户的功能 此外还具有删除信息 管理信息的回复的功能

package control;
import java.io.IOException;
import javax.servlet.http.*;
import javax.servlet.*;

import model.*;
import java.util.*;
import java.io.*;
public class ShowImage extends HttpServlet
{
	public void init(ServletConfig config)throws ServletException
    {
   	 super.init(config);
    }
	
    public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
    {
   	 doPost(req,res);
    }
    
    public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
    {
    	int imageid = Integer.parseInt((String)req.getParameter("imageid"));
    	CardCom com = new CardCom("jdbc:mysql://localhost/mybbs","root", "root123");
    	Card card = com.getCard(imageid);
    	String filename = card.getFileName();
    	FileInputStream  in  = new FileInputStream(filename);
    	int len = 10*1024*1024;
    	
    	OutputStream out = res.getOutputStream();
    	res.reset();
    	res.setContentType("image/jpeg;charset=GB2312");   //本来设置为（image/jpg）显示不出来的  后来设置了成现在这样就可以了 哈哈
    	byte buff[] = new byte[len];
    	int i = 0;
    	while((i = in.read(buff))!=-1)
    	{
    		out.write(buff,0,i);
    	}
    	in.close();
    	out.flush();
    	out.close();
    }
}