java将图片存入数据库

最新推荐文章于 2022-06-23 15:07:42 发布

原创最新推荐文章于 2022-06-23 15:07:42 发布 · 1k 阅读

1 ·

CC 4.0 BY-SA版权

本文介绍了使用Java将图片文件转换为字节数组，并通过SQL语句将这些字节数组存储到数据库中的一种方法。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

java将图片存入数据库

(2013-01-15 19:48:47)

转载▼

标签：

it

分类： java

import java.sql.*;
import java.io.*;
import java.nio.*;

public class UploadImage {
   protected Connection dbConnection;
   protected String driverName = "com.mysql.jdbc.Driver";
   protected String dbURL = "jdbc:mysql://localhost/sample_db";
   protected String userID = "root";
   protected String passwd = "111111";

   public boolean storeImage(String sqlstr, File file) {
      try {
         FileInputStream fin = new FileInputStream(file);
         ByteBuffer nbf = ByteBuffer.allocate((int) file.length());
         byte[] array = new byte[1024];
         int offset = 0, length = 0;
         while ((length = fin.read(array)) > 0) {
            if (length != 1024)
               nbf.put(array, 0, length);
            else
               nbf.put(array);
            offset += length;
         }
         fin.close();
         byte[] content = nbf.array();
         return setImage(sqlstr, content);

      } catch (FileNotFoundException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
      return false;
   }

   private boolean setImage(String sqlstr, byte[] in) {
      boolean flag = false;
      if (sqlstr == null)
         sqlstr = "select * from picture_db";
      try {
         Class.forName(driverName);
         dbConnection = DriverManager.getConnection(dbURL, userID, passwd);
         Statement stmt = dbConnection.createStatement(
               ResultSet.TYPE_SCROLL_INSENSITIVE,
               ResultSet.CONCUR_UPDATABLE);
         ResultSet rs = stmt.executeQuery(sqlstr);
         if (rs.next()) {
            rs.updateBytes(2, in);
            rs.updateRow();
         } else {
            rs.moveToInsertRow();
            rs.updateString(1, "lena");
            rs.updateBytes(2, in);
            rs.insertRow();
         }
         rs.close();
         flag = true;
      } catch (Exception e) {
         e.printStackTrace();
      }
      return flag;
   }

   public static void main(String[] args) {
      UploadImage upload = new UploadImage();
      try {
         File file = new File("/home/dz/workspace/lena.jpg");
         if (upload.storeImage(null, file))
            System.out.print("true");
         else
            System.out.print("False");
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
}