用jdbc访问二进制类型的数据

 package it.cast.jdbc;

 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.Statement;

 public class BlobTest {

     public static void main(String[] args) {
         read();
     }

     static void create() {
         Connection conn = null;
         PreparedStatement ps = null;
         ResultSet rs = null;

         try {
             // 建立连接
             conn = jdbcUtils.getConnection();

             // 创建语句
             String sql = "insert into blob_test(big_bit) values(?)";
             ps = conn.prepareStatement(sql);
             File file = new File("ww.gif");
             InputStream in = new BufferedInputStream(new FileInputStream(file));

             ps.setBinaryStream(1, in, (int) file.length());

             // 执行语句
             int i = ps.executeUpdate();

             System.out.println(i);

             in.close();
         } catch (Exception e) {
             System.out.println("error");
         } finally {
             jdbcUtils.free(rs, ps, conn);
         }

     }

     static void read() {
         Connection conn = null;
         Statement st = null;
         ResultSet rs = null;

         try {
             // 建立连接
             conn = jdbcUtils.getConnection();

             // 创建语句
             st = conn.createStatement();

             String sql = "select big_bit from blob_test";

             // 执行语句
             rs = st.executeQuery(sql);

             while (rs.next()) {
                 InputStream in = rs.getBinaryStream(1);

                 File file = new File("ww_bak.gif");

                 OutputStream out = new BufferedOutputStream(
                         new FileOutputStream(file));
                 byte[] buff = new byte[1024];

                 for (int i = 0; (i = in.read()) > 0;) {
                     out.write(buff, 0, 1);
                 }
                 in.close();
                 out.close();
             }

         } catch (Exception e) {
             System.out.println("error");
         } finally {
             jdbcUtils.free(rs, st, conn);
         }

     }

 }

BlobTest