从数据库读图片并在页面中显示

主要思路：

   <img src="showImage.do?name=mall&column=image"/>通过src访问servlet，由response的流输出图片到页面。

流的方式一：

      response.setHeader("Cache-Control", "no-store");
      response.setHeader("Pragma", "no-cache");
      response.setDateHeader("Expires", 0);
      response.setContentType("image/jpg");
      ServletOutputStream responseOutputStream = response.getOutputStream();
          String name = request.getParameter("mall_name");
          PreparedStatement ps = null;
          ResultSet rs = null;
          Connection con;
          String sql = "select MALL_LOGO from trustsg_mall_info where MALL_NAME = ?";
 try {
     Class.forName("com.mysql.jdbc.Driver");
     con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/ofbiz","ofbiz","ofbiz");
         ps = con.prepareStatement(sql);
            ps.setString(1, name);
            rs = ps.executeQuery();
            if(rs.next()){
              Blob b = rs.getBlob("MALL_LOGO");
              Debug.logInfo("showimage"+b, "sssssssssssss");
                 byte[] images = b.getBytes(1, (int)b.length());
                 responseOutputStream.write(images);
            }

 } catch (SQLException e) {
     e.printStackTrace();
 } catch (ClassNotFoundException e) {
     e.printStackTrace();
 }
          responseOutputStream.flush();
          responseOutputStream.close();

 流的方式二：

  int id= Integer.parseInt(request.getParameter("picid"));
    String sql = "select pic from p WHERE picid="+id;
    ResultSet rs=conn.getResult(sql);
 while(rs.next())
 {
        ServletOutputStream sout = response.getOutputStream();
        //图片输出的输出流
        InputStream in = rs.getBinaryStream(1);
        byte b[] = new byte[0x7a120];
        for(int i = in.read(b); i != -1;)
        {
          sout.write(b);
          //将缓冲区的输入输出到页面
          in.read(b);
        }
        sout.flush();
        //输入完毕，清除缓冲
        sout.close();

 使用jsp：

 <%@ page contentType="text/html; charset=gbk" %>
 <%@ page import="java.io.*"%>
 <%@ page import="java.sql.*, javax.sql.*" %>
 <%@ page import="java.util.*"%>
 <%@ page import="java.math.*"%>

 <%
 String photo_no = request.getParameter("photo_no");

 //mysql连接
 Class.forName("com.mysql.jdbc.Driver").newInstance();
 String URL="jdbc:mysql://localhost:3306/job?user=root&password=111111";
 Connection con = DriverManager.getConnection(URL);

 //oracle连接
 //String URL="jdbc:oracle:thin@localhost:1521:orcl2";
 //user="system";
 //password="manager";
 //Connection con = DriverManager.getConnection(URL,user,password);

 try{
 // 准备语句执行对象
 Statement stmt = con.createStatement();

 String sql = " SELECT * FROM PHOTO WHERE photo_no = "+ photo_no;
 ResultSet rs = stmt.executeQuery(sql);
 if (rs.next()) {
 Blob b = rs.getBlob("photo_image");
 long size = b.length();
 //out.print(size);
 byte[] bs = b.getBytes(1, (int)size);
 response.setContentType("image/jpeg");
 OutputStream outs = response.getOutputStream();
 outs.write(bs);
 outs.flush();
 rs.close();
 }
 else {
 rs.close();
 response.sendRedirect("./images/error.gif");
 }
 }
 finally{
 con.close();
 }

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