Java+MySql图片数据保存与读取的具体实例

创建表：

create table img_table(
img_id int not null auto_increment primary key,
img_name varchar(10) comment'名字',
img_data mediumblob):图片流存取工具：
package com.lijianrong.Mysql.cn;

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 imgUtil {
private static FileInputStream fis=null;
//获得图片的输入流并返回
public static FileInputStream getImageByte(String str){
try {
fis=new FileInputStream(new File(str));

} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return fis;

}
//根据inputstream将图片保存
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) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
将图片保存到数据库中相应的表格。
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) {
String str="jdbc:mysql://localhost:3306/test";
String name="root";
String password="768696";
InputStream inputstream=null;

try {
inputstream=imgUtil.getImageByte("C:\\Users\\lijianrong\\Desktop\\1.jpg");
Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection(str, name, password);
PreparedStatement pst=conn.prepareStatement("insert into img_table values(?,?,?)");
pst.setInt(1, 001);
pst.setString(2, "李建荣");
pst.setBinaryStream(3,inputstream,inputstream.available());
pst.executeUpdate();
System.out.println("图片插入成功");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}
从数据库中读取并保存图片
package com.lijianrong.Mysql.cn;

import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mysql.jdbc.Statement;

public class ImageLoad {

public static void main(String[] args) {
String str="jdbc:mysql://localhost:3306/test";
String name="root";
String password="768696";
InputStream inputstream=null;
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection(str, name, password);
java.sql.Statement pst=conn.createStatement();
ResultSet result=pst.executeQuery("select p.img_data from img_table p");
result.next();
InputStream inputstream1=result.getBinaryStream("img_data");
imgUtil.readBlob(inputstream1,"E:\\pig.jpg");

} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}