本文主要是介绍如何将图片存入MySQL中的blob去，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
建立表：
CREATE TABLE example (name VARCHAR(100),city VARCHAR(100),image BLOB,Phone VARCHAR(100));使用一张图片qqq.jpg
存图片的代码：
package test;import java.sql.*;
import java.io.*;public class SaveImageToDatabase {public static void main(String[] args) throws SQLException {// declare a connection by using Connection interfaceConnection connection = null;/** Create string of connection url within specified format with machine* name, port number and database name. Here machine name id localhost* and database name is mahendra.*/String connectionURL = "jdbc:mysql://localhost:3306/test";/** declare a resultSet that works as a table resulted by execute a* specified sql query.*/ResultSet rs = null;// Declare prepare statement.PreparedStatement psmnt = null;// declare FileInputStream object to store binary stream of given image.FileInputStream fis;try {// Load JDBC driver "com.mysql.jdbc.Driver"Class.forName("com.mysql.jdbc.Driver").newInstance();/** Create a connection by using getConnection() method that takes* parameters of string type connection url, user name and password* to connect to database.*/connection = DriverManager.getConnection(connectionURL, "root","root");// create a file object for image by specifying full path of image// as parameter.File image = new File("D:/qqq.jpg");/** prepareStatement() is used for create statement object that is* used for sending sql statements to the specified database.*/psmnt = connection.prepareStatement("insert into example(name, city, image, Phone) "+ "values(?,?,?,?)");psmnt.setString(1, "michael");psmnt.setString(2, "Delhi");psmnt.setString(4, "123456");fis = new FileInputStream(image);psmnt.setBinaryStream(3, (InputStream) fis, (int) (image.length()));/** executeUpdate() method execute specified sql query. Here this* query insert data and image from specified address.*/int s = psmnt.executeUpdate();if (s > 0) {System.out.println("Uploaded successfully !");} else {System.out.println("unsucessfull to upload image.");}}// catch if found any exception during rum time.catch (Exception ex) {System.out.println("Found some error : " + ex);} finally {// close all the connections.connection.close();psmnt.close();}}
}
将图片从数据库中取出来，放到文件中：
package com.liang.java;import java.sql.*;
import java.io.*;public class GetImageFromDatabase {public static void main(String[] args) throws SQLException {Connection connection = null;String connectionURL = "jdbc:mysql://localhost:3308/thzdatabase";ResultSet rs = null;PreparedStatement psmnt = null;// declare FileInputStream object to store binary stream of given image.FileOutputStream fos;try {File imageout = new File("D:/1111.png");fos=new FileOutputStream(imageout);Class.forName("com.mysql.jdbc.Driver").newInstance();connection = DriverManager.getConnection(connectionURL, "root","111111");psmnt = connection.prepareStatement("select image from test where name=? ");psmnt.setString(1, "michael");rs=psmnt.executeQuery();rs.next();Blob image_blob=rs.getBlob("image");InputStream is=image_blob.getBinaryStream();byte[] b = null;byte [] a = new byte[is.read(b, 0, b.length)];System.out.println(is.toString());int ch = 0; try { while((ch=is.read()) != -1){ fos.write(ch); } } catch (IOException e1) { e1.printStackTrace(); } finally{ fos.close(); is.close(); }}// catch if found any exception during rum time.catch (Exception ex) {System.out.println("Found some error : " + ex);} finally {// close all the connections.System.out.println("Found success!");connection.close();psmnt.close();}}
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