Question

你好，我是jsp编程的新手。我试图用字节字段在PostgreSQL数据库中插入图像。到目前为止，这是我的代码。

jsp代码

 <%@page contentType="text/html" pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
        <head>
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
            <title>JSP Page</title>
        </head>
        <body>
            <h1>Test image</h1>
            <form action="Upload" method="post" enctype="multipart/form-data">
                <input type="text" name="description" />
                <input type="file" name="file" />
                <input type="submit" />
            </form>
        </body>
    </html>

servlet代码

protected void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
InputStream inputStream = null;  

        // obtains the upload file part in this multipart request  
        Part filePart = request.getPart("file");  
        if (filePart != null) {  
            // debug messages  
            System.out.println(filePart.getName());  
            System.out.println(filePart.getSize());  
            System.out.println(filePart.getContentType());  

            // obtains input stream of the upload file  
            inputStream = filePart.getInputStream();  
        }  

         try {
            Class.forName("org.postgresql.Driver");
            Connection con = DriverManager.getConnection("jdbc:postgresql://localhost:8084/hgcirequestproject", "appdev2", "Hgc@dm1nD3v310p3r2k14");

            PreparedStatement ps = con.prepareStatement("insert into tbl_testimage (test) values (?)");
         ps.setBinaryStream(1, inputStream);

            ps.executeQuery();
            out.println("success");
            con.close();
            ps.close();
        } catch (Exception e) {
            System.out.println(e.toString());

        }



    }

}

我收到错误.setBinaryStream（int，InputStream）尚未实现。任何帮助将不胜感激。感谢

Answer 1

您必须使用the 3-argument setBinaryStream variant来提供流内容的字节长度。

PostgreSQL有线协议要求在数据自身之前发送长度，因此PgJDBC必须知道长度。

Newer versions of PgJDBC support the 2-argument form by buffering the stream first

setBinaryStream（int，InputStream）尚未实现

1 个答案: