Java+MySql图片数据保存

java

  之前一直没有做过涉及到图片存储的应用,最近要做的东东涉及到了这个点,就做了一个小的例子算是对图片存储的初试吧!

1.创建表:

drop table if exists photo;

CREATE TABLE photo (

id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(100) COMMENT '名称',

photo blob COMMENT '照片'

)

ENGINE=InnoDB

DEFAULT CHARSET=utf8

COLLATE=utf8_general_ci;

  图片在MySql中的数据存储格式为blob类型;Blob是一个可以存储二进制文件的容器。

2.编写图片流数据存取的工具类:

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

public class ImageUtil {

private static File file = null;

/**

* 从本地文件读取图像的二进制流

*

* @param infile

* @return

*/

public static FileInputStream getImageByte(String infile) {

FileInputStream imageByte = null;

file = new File(infile);

try {

imageByte = new FileInputStream(file);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

return imageByte;

}

/**

* 将图片流读出为图片

*

* @param inputStream

* @param path

*/

public static void readBlob(InputStream inputStream, String path) {

try {

FileOutputStream fileOutputStream = new FileOutputStream(path);

byte[] buffer = new byte[1024];

int len = 0;

while ((len = inputStream.read(buffer)) != -1) {

fileOutputStream.write(buffer, 0, len);

}

inputStream.close();

fileOutputStream.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

3.将本地文件保存到数据库

  需要添加MySql的数据库驱动--mysql-connector-java-5.1.24-bin.jar

import java.io.IOException;

import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.SQLException;

public class ImageInsert {

public static void main(String[] args) {

try {

Class.forName("com.mysql.jdbc.Driver").newInstance();

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

String user = "root";

String password = "root";

String url = "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8";

Connection connection = null;

try {

connection = DriverManager.getConnection(url, user, password);

} catch (SQLException e) {

e.printStackTrace();

}

PreparedStatement preparedStatement = null;

InputStream inputStream = null;

inputStream = ImageUtil.getImageByte("D:\\temp\\photo1.png");

try {

String sql = "insert into photo(id,name,photo) values(?,?,?)";

preparedStatement = connection.prepareStatement(sql);

preparedStatement.setInt(1, 1);

preparedStatement.setString(2, "朱莉");

preparedStatement.setBinaryStream(3, inputStream,

inputStream.available());

preparedStatement.execute();

} catch (SQLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (inputStream != null)

inputStream.close();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (preparedStatement != null)

preparedStatement.close();

} catch (SQLException e) {

e.printStackTrace();

} finally {

try {

connection.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

}

}

4.从数据库中读取并生成图片

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 ImageGet {

public static void main(String[] args) {

try {

Class.forName("com.mysql.jdbc.Driver").newInstance();

} catch (InstantiationException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

String user = "root";

String password = "root";

String url = "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8";

Connection connection = null;

try {

connection = DriverManager.getConnection(url, user, password);

} catch (SQLException e) {

e.printStackTrace();

}

Statement statement = null;

ResultSet resultSet = null;

InputStream inputStream = null;

try {

statement = connection.createStatement();

String sql = "select p.photo from photo p where id = 1";

resultSet = statement.executeQuery(sql);

resultSet.next();

inputStream = resultSet.getBinaryStream("photo");

ImageUtil.readBlob(inputStream, "D:\\temp\\photo2.png");

} catch (SQLException e) {

e.printStackTrace();

} finally {

try {

if (inputStream != null)

inputStream.close();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (resultSet != null)

resultSet.close();

} catch (SQLException e) {

e.printStackTrace();

} finally {

if (statement != null)

if (statement != null)

try {

statement.close();

} catch (SQLException e) {

e.printStackTrace();

} finally {

if (connection != null)

try {

connection.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

}

}

}

5.Over!

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