Question

我想从数据库中检索图像并使用img标记在JSP中显示它。我正在使用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();
        }
    }
}

此代码直接显示图像。但我想要这条道路。所以我可以在任何我想要的地方展示它。有没有其他方法可以在动态网页中显示此图像？

Answer 1

路径取决于servlet在web.xml中的映射方式（因为我没有在代码中看到任何注释）。另一种 - 但相当沮丧 - 的方式是使用数据URI。见I want to retrieve image from mysql database using servlet and show that image along with that user details in table

我想从数据库中检索图像并使用<img/>标记在JSP中显示它。我正在使用我的SQL

1 个答案: