私はjspが初めてで、ユーザーが写真をデータベースにアップロードする簡単なページを作成しようとしています。
私はupload.jspページを使用しました：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>File Upload to Database Demo</title>
</head>
<body>
<center>
<h1>File Upload to Database Demo</h1>
<form method="post" action="uploadServlet" enctype="multipart/form-data">
<table border="0">
<tr>
<td>First Name: </td>
<td><input type="text" name="firstName" size="50"/></td>
</tr>
<tr>
<td>Last Name: </td>
<td><input type="text" name="lastName" size="50"/></td>
</tr>
<tr>
<td>Portrait Photo: </td>
<td><input type="file" name="photo" size="50"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Save">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
そして、仕事をするJavaクラス：
package classes.servlets;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@WebServlet("/uploadServlet")
@MultipartConfig(maxFileSize = 16177215) // upload file's size up to 16MB
public class FileUploadDBServlet extends HttpServlet {
// database connection settings
static final String ODBC_DRIVER = "sun.jdbc.odbc.JdbcOdbcDriver";
static final String DSN = "jdbc:odbc:PMRteste";
static final String USER = "root";
static final String PWD = "1234";
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// gets values of text fields
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
Connection _conexao = null;
InputStream inputStream = null; // input stream of the upload file
// obtains the upload file part in this multipart request
Part filePart = request.getPart("photo");
if (filePart != null) {
// prints out some information for debugging
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();
}
//Connection conn = null; // connection to the database
String message = null; // message will be sent back to client
try {
try {
try {
// connects to the database
//DriverManager.registerDriver(new com.mysql.jdbc.Driver());
Class.forName(ODBC_DRIVER).newInstance();
} catch (ClassNotFoundException ex) {
Logger.getLogger(FileUploadDBServlet.class.getName()).log(Level.SEVERE, null, ex);
}
} catch (InstantiationException ex) {
Logger.getLogger(FileUploadDBServlet.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(FileUploadDBServlet.class.getName()).log(Level.SEVERE, null, ex);
}
_conexao = DriverManager.getConnection(DSN, USER, PWD);
// constructs SQL statement
String sql = "INSERT INTO contacts (first_name, last_name, photo) values (?, ?, ?)";
//System.out.append("INSERT INTO contacts (first_name, last_name, photo) values (?, ?, ?)");
PreparedStatement statement = _conexao.prepareStatement(sql);
statement.setString(1, firstName);
statement.setString(2, lastName);
if (inputStream != null) {
// fetches input stream of the upload file for the blob column
statement.setBinaryStream(3, inputStream);
//System.out.println("entra aqui");
}
// sends the statement to the database server
int row = statement.executeUpdate();
if (row > 0) {
message = "File uploaded and saved into database";
}
} catch (SQLException ex) {
message = "ERROR: " + ex.getMessage();
ex.printStackTrace();
} finally {
if (_conexao != null) {
// closes the database connection
try {
_conexao.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
// sets the message in request scope
request.setAttribute("Message", message);
// forwards to the message page
getServletContext().getRequestDispatcher("/Message.jsp").forward(request, response);
}
}
}
しかし、常にエラーメッセージが表示されます: [MySQL][ODBC 5.2(a) Driver][mysqld-5.6.14]SQLBindParameter not used for all parameters
データベースとの接続を確認しましたが、すべて正常に動作しています (データベースに名前と姓を追加できます)。
(message.jsp は、写真が正常に更新されたかどうかにかかわらず、ユーザーにメッセージを表示するだけです)
手伝って頂けますか？:)