java.sql.SQLException：列索引超出范围，0 <1

我想显示数据库中的所有图像。 我编写了代码但是显示错误java.sql.SQLException：列索引超出范围，0 <1。下面是我的数据库表

| application_name | varchar(45) | | application_id | varchar(10) | | application_path | varchar(500) | | application_icon | blob | 

我想只显示images.below是我的servlet代码

IconDownload.java

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.setContentType("image/jpeg"); PrintWriter out=response.getWriter(); try { Connection connection= DBUtil.getConnection(); PreparedStatement preparedStatement=connection.prepareStatement("select application_icon from application_master"); ResultSet resultSet=preparedStatement.executeQuery(); System.out.println("resultSet"+resultSet); out.print("
photo
"); while (resultSet.next()) { out.print(" " ); } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } 

Answer 1

列索引应从1开始而不是0

http://docs.oracle.com/javase/7/docs/api/java/sql/ResultSet.html#getBlob(int）

参数 ：columnIndex – 第一列为1，第二列为2，…

应该

 resultSet.getBlob(1) //first column 

Answer 2

声明应该是这样的

while（resultSet.next（））

resultSet.getBlob（1）;

col索引从1到…

Answer 3

 Blob getBlob(int columnIndex) throws SQLException Retrieves the value of the designated column in the current row of this ResultSet object as a Blob object in the Java programming language. Parameters: columnIndex - the first column is 1, the second is 2, ... Returns: a Blob object representing the SQL BLOB value in the specified column 

您尝试按索引0访问列，而枚举以1开头