jdbc 3.0
1.将Blob、Clob类型数据保存到数据库
1 import java.io.File; 2 import java.io.FileInputStream; 3 import java.io.FileReader; 4 import java.sql.Connection; 5 import java.sql.DriverManager; 6 import java.sql.PreparedStatement; 7 8 9 public class Test4 { 10 /** 11 * 将图片、文本保存在数据库 12 * Blob、Clob 13 * @author 容杰龙 14 */ 15 public static void main(String[] args) { 16 try { 17 Class.forName("com.mysql.jdbc.Driver"); 18 String url="jdbc:mysql://localhost:3306/rjl"; 19 String user="rjl"; 20 String password="123"; 21 Connection conn = DriverManager.getConnection(url, user, password); 22 String sql1="insert into pic(img,msg) values(?,?)"; 23 24 File file=new File("C:/Users/Rong/Desktop/qq.png"); 25 FileInputStream inputStream = new FileInputStream(file); 26 27 FileReader reader = new FileReader("C:/Users/Rong/Desktop/msg.txt"); 28 29 PreparedStatement ps = conn.prepareStatement(sql1); 30 //字节流-二进制图像 31 ps.setBlob(1, inputStream); 32 //字符流 33 ps.setClob(2, reader); 34 int count = ps.executeUpdate(); 35 if (count>0) { 36 System.out.println("添加成功！"); 37 } 38 } catch (Exception e) { 39 e.printStackTrace(); 40 } 41 42 } 43 44 }
2.从数据库表里读取Blob、Clob类型数据
1 package com.rong.web; 2 3 import java.io.FileOutputStream; 4 import java.io.FileWriter; 5 import java.io.InputStream; 6 import java.io.Reader; 7 import java.sql.Connection; 8 import java.sql.DriverManager; 9 import java.sql.PreparedStatement; 10 import java.sql.ResultSet; 11 12 public class Test5 { 13 14 15 /** 16 * 读取MySQL数据库Blob、Clob类型的数据到硬盘 17 * @author 容杰龙 18 */ 19 public static void main(String[] args) { 20 try { 21 Class.forName("com.mysql.jdbc.Driver"); 22 String url="jdbc:mysql://localhost:3306/rjl?user=root&password=123123"; 23 Connection conn = DriverManager.getConnection(url); 24 String sql="select * from pic where id=?"; 25 PreparedStatement ps = conn.prepareStatement(sql); 26 ps.setInt(1, 1); 27 ResultSet rs = ps.executeQuery(); 28 while(rs.next()){ 29 //获取字节输入流 30 InputStream inputStream = rs.getAsciiStream("img"); 31 //获取字符输入流 32 Reader reader = rs.getCharacterStream("msg"); 33 byte[] bytes=new byte[1024]; 34 char[] chars=new char[1024]; 35 int len=0; 36 //创建文件输出流，设置文件存储的硬盘位置 37 FileOutputStream fos = new FileOutputStream("C:/Users/Administrator/Desktop/jdbc.png"); 38 FileWriter fw = new FileWriter("C:/Users/Administrator/Desktop/jdbc.txt"); 39 //字节输出 40 while ((len=inputStream.read(bytes))!=-1) { 41 fos.write(bytes, 0, len); 42 } 43 fos.close(); 44 inputStream.close(); 45 len=0; 46 //字符输出 47 while ((len=reader.read(chars))!=-1) { 48 fw.write(chars, 0, len); 49 } 50 fw.close(); 51 reader.close(); 52 53 } 54 } catch (Exception e) { 55 e.printStackTrace(); 56 } 57 58 } 59 60 }
1 package com.rong.web; 2 3 import java.io.FileOutputStream; 4 import java.io.FileWriter; 5 import java.io.InputStream; 6 import java.io.Reader; 7 import java.sql.Blob; 8 import java.sql.Clob; 9 import java.sql.Connection; 10 import java.sql.DriverManager; 11 import java.sql.PreparedStatement; 12 import java.sql.ResultSet; 13 14 public class Test6 { 15 16 /** 17 * 读取MySQL数据库Blob、Clob类型的数据到硬盘 18 * @author 容杰龙 19 */ 20 public static void main(String[] args) { 21 try { 22 Class.forName("com.mysql.jdbc.Driver"); 23 String url="jdbc:mysql://localhost:3306/rjl?user=root&password=123123"; 24 Connection conn = DriverManager.getConnection(url); 25 String sql="select * from pic where id=?"; 26 PreparedStatement ps = conn.prepareStatement(sql); 27 ps.setInt(1, 1); 28 ResultSet rs = ps.executeQuery(); 29 while(rs.next()){ 30 //获取blob对象 31 Blob blob = rs.getBlob("img"); 32 //获取二进制字节输入流 33 InputStream binaryStream = blob.getBinaryStream(); 34 ////////////////////////////////////////////////// 35 36 //获取clob对象 37 Clob clob = rs.getClob("msg"); 38 //获取字符输入流 39 Reader characterStream = clob.getCharacterStream(); 40 41 byte[] bytes=new byte[1024]; 42 char[] chars=new char[1024]; 43 int len=0; 44 //创建文件输出流，设置文件存储的硬盘位置 45 FileOutputStream fos = new FileOutputStream("C:/Users/Administrator/Desktop/jdbc.png"); 46 FileWriter fw = new FileWriter("C:/Users/Administrator/Desktop/jdbc.txt"); 47 //字节输出 48 ///////////////////////////////// 49 // byte[] bs = rs.getBytes("img"); 50 // fos.write(bs); 51 //////////////////////////////////// 52 while ((len=binaryStream.read(bytes))!=-1) { 53 fos.write(bytes, 0, len); 54 } 55 fos.close(); 56 binaryStream.close(); 57 len=0; 58 //字符输出 59 while ((len=characterStream.read(chars))!=-1) { 60 fw.write(chars, 0, len); 61 } 62 fw.close(); 63 characterStream.close(); 64 65 } 66 } catch (Exception e) { 67 e.printStackTrace(); 68 } 69 70 } 71 72 }
