Question

我已经编写了这段代码，用于将照片添加到数据库中，而且我对Web应用程序的了解并不多所以请帮帮我

        // 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 {
         // connects to the database
        DriverManager.registerDriver(new com.mysql.jdbc.Driver());
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/opmdb", "root", "sourabh");

        // constructs SQL statement
        String sql = "INSERT INTO photos (userId, photo) values (?, ?)";
        PreparedStatement statement = conn.prepareStatement(sql);
        statement.setString(1, userName);
        statement.setBinaryStream(2, inputStream);

这里告诉错误我也使用了setBlob，但错误仍然相同例外和堆栈跟踪是

java.lang.AbstractMethodError:com.mysql.jdbc.PreparedStatement.setBinaryStream(ILjava/io/InputStream;)V
at org.onlinepicturemanager.addphotoservlet.AddPhotoServlet.doPost(AddPhotoServlet.java:81)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Answer 1

更改您的代码statement.setBinaryStream(2, inputStream); 到

statement.setBinaryStream(2, inputStream,file.length);

'setBinaryStream'方法需要3个参数，在此方法中添加文件长度

生成JavaAbstractMethod异常

1 个答案: