我想从数据库中检索图像并在JSP中使用显示它 <img> 标签。 我正在使用我的SQL

Question

I want to retrieve image from database and display it in JSP using img tag. I am using mySql.

public class DisplayImage extends  HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //PrintWriter pw = response.getWriter();
        String connectionURL = "jdbc:mysql://localhost:3306/demodb";;
        java.sql.Connection con=null;
        try{  
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            con=DriverManager.getConnection(connectionURL,"root","0321");  
            Statement st1=con.createStatement();
            ResultSet rs1 = st1.executeQuery("select photo from contacts where  contact_id='2'");
            String imgLen="";
            if(rs1.next()){
                imgLen = rs1.getString(1);
                System.out.println(imgLen.length());
            }  
            rs1 = st1.executeQuery("select photo from contacts where contact_id='2'");
            if(rs1.next()){
                int len = imgLen.length();
                byte [] rb = new byte[len];
                InputStream readImg = rs1.getBinaryStream(1);
                int index=readImg.read(rb, 0, len);  
                System.out.println("index"+index);
                st1.close();
                response.reset();
                response.setContentType("image/jpg");
                response.getOutputStream().write(rb,0,len);
                response.getOutputStream().flush();  
            }
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }
}    

This Code display image directly. But I want the path. So I can display it wherever I want. Are there any other ways to display this image in a dynamic web page?

Answer 1

The path depends on how your servlet is mapped in web.xml (as I don't see any annotations in your code). The other - but rather discouraged - way is to use data URI. See I want to retrieve image from mysql database using servlet and show that image along with that user details in table