往MySQL中存储图片_MySQL

CREATE TABLE    photo    (        id INT NOT NULL AUTO_INCREMENT,        name VARCHAR(100),        photo MediumBlob,        PRIMARY KEY (id)    )    ENGINE=InnoDB DEFAULT CHARSET=utf8;/*MySQL的四种BLOB类型类型 大小(单位：字节)TinyBlob 最大 255Blob 最大 65KMediumBlob 最大 16MLongBlob 最大 4G*/

2.新建包名com.sk.util,新建ImageUtil类，如下：

package com.sk.util;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.新建包名com.sk.handle,新建WriteImage类，如下：

package com.sk.handle;import java.io.IOException;import java.io.InputStream;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.SQLException;import com.sk.util.ImageUtil;public class WriteImage {	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/oa?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://工作//图片//5.jpg");		try {			String sql = "insert into photo(id,name,photo) values(?,?,?)";			preparedStatement = connection.prepareStatement(sql);			preparedStatement.setInt(1, 1);			preparedStatement.setString(2, "前言");			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.在新建ReadImage类，如下：

package com.sk.handle;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;import com.sk.util.ImageUtil;public class ReadImage {	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/oa?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://1.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.图片路径要修改。

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