java读取oracle数据库中blob字段详解编程语言

测试表

create table TEST_IMG 
( 
  ID    INTEGER not null, 
  NAME  VARCHAR2(32), 
  IMAGE BLOB 
);

说明：

1、使用JDBC演示

2、IMAGE字段存储一个图片

程序代码如下：

import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 
 
public class Test { 
 
	public static final String DRIVER = "oracle.jdbc.driver.OracleDriver"; 
	public static final String URL = "jdbc:oracle:thin:@127.0.0.1:1521:orcl"; 
	public static final String USERNAME = "test"; 
	public static final String PASSWORD = "test"; 
 
	static { 
		try { 
			Class.forName(DRIVER); 
		} catch (ClassNotFoundException e) { 
			e.printStackTrace(); 
		} 
	} 
 
	/** 
	 * @param args 
	 */ 
	public static void main(String[] args) { 
		if (download()) { 
			System.out.println("图片下载成功"); 
		} else { 
			System.out.println("图片下载失败"); 
		} 
	} 
 
	public static boolean download() { 
		Connection conn = getConnection(); 
		Statement sta = null; 
		ResultSet rs = null; 
		try { 
			sta = conn.createStatement(); 
			// image字段为BLOG字段 
			String sql = "Select name, image from test_img where id='1'"; 
			rs = sta.executeQuery(sql); 
			while (rs.next()) { 
				// 输出文件名 
				String name = rs.getString("name"); 
				oracle.sql.BLOB blob = (oracle.sql.BLOB) rs.getBlob("image"); 
				String filepath = "D:/" + name + ".jpg"; 
				System.out.println("输出文件路径为:" + filepath); 
 
				InputStream input = blob.getBinaryStream(); 
				FileOutputStream out = new FileOutputStream(filepath); 
				int len = (int) blob.length(); 
				byte buffer[] = new byte[len]; 
				while ((len = input.read(buffer)) != -1) { 
					out.write(buffer, 0, len); 
				} 
				out.close(); 
				input.close(); 
			} 
		} catch (SQLException e) { 
			e.printStackTrace(); 
			return false; 
		} catch (FileNotFoundException e) { 
			e.printStackTrace(); 
			return false; 
		} catch (IOException e) { 
			e.printStackTrace(); 
			return false; 
		} finally { 
			try { 
				rs.close(); 
				sta.close(); 
				conn.close(); 
			} catch (SQLException e) { 
				e.printStackTrace(); 
				return false; 
			} 
		} 
		return true; 
	} 
 
	/** 
	 * 获得Connection 
	 */ 
	public static Connection getConnection() { 
		Connection conn = null; 
		try { 
			conn = DriverManager.getConnection(URL, USERNAME, PASSWORD); 
		} catch (SQLException e) { 
			e.printStackTrace(); 
		} 
		return conn; 
	} 
 
}

存入图片Blob参见：Oracle JDBC存入图片Blob

作者：blog.ytso.com