java操作mysql存储读取图片
2015-07-01 17:51
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为了使用JSP灵活 需要把各种文件储存在数据库中 然后需要的时候将它读取出来显示到客户端 这些文件包括文本 图片 音乐等 人们统称为二进制文件 ：： 二进制文件储存在数据库中的过程是 打开文件 将内容读到缓存区 然后直接连接创建JDBC语句对象
使用该缓冲区的数据 并执行更新 就完成了储存
1 在mysql中创建一个表picture_db
create table picture_db(
file_name varchar(255) not null,
content longblob,
primary key (file_name));
2 java 写储存文件的代码
import java.sql.*;
import java.io.*;
import java.nio.*;
public class UploadImage {
protected Connection dbConnection;
protected String driverName = "com.mysql.jdbc.Driver";
protected String dbURL = "jdbc:mysql://localhost:3306/sample_db";
protected String userID = "root";
protected String passwd = "yourpassword";
public boolean storeImage(String sqlstr,File file){
try{
FileInputStream fin = new FileInputStream(file);
ByteBuffer nbf = ByteBuffer.allocate((int)file.length());
byte[] array = new byte[1024];
int offset =0,length=0;
while((length=fin.read(array))>0){
if(length!=1024)
nbf.put(array,0,length);
else
nbf.put(array);
offset+=length;
}
fin.close();
byte[] content = nbf.array();
return setImage(sqlstr,content);
}catch(FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return false;
}
private boolean setImage(String sqlstr,byte[] in){
boolean flag = false;
if(sqlstr==null)
sqlstr="select * from picture_db";
try{
Class.forName(driverName);
dbConnection = DriverManager.getConnection(dbURL,userID,passwd);
Statement stmt = dbConnection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery(sqlstr);
if(rs.next()){
rs.updateBytes(2,in);
rs.updateRow();
}
else{
rs.moveToInsertRow();
rs.updateString(1,"01");
rs.updateBytes(2,in);
rs.insertRow();
}
rs.close();
flag=true;
}catch(Exception e){
e.printStackTrace();
}
return flag;
}
public static void main(String[] args){
UploadImage upload = new UploadImage();
try{
File file = new File("01.jpg");
if(upload.storeImage(null, file))
System.out.print("ture");
else
System.out.print("False");
}catch(Exception e){
e.printStackTrace();
}
}
}
如果执行成功的话 系统打印 true 否则 false
3 就是将图片读取出来 与储存的过程相反 先建立连接 创建数据库查询JDBC对象 使用该语句来返回二进制结果 保存到文件中
<%@ page contentType = "image/jpeg;charset=GB2312"%>
<%@ page import="java.sql.*"%><%@ page import="java.io.*"%>
<%@ page import="com.sun.image.codec.jpeg.*"%>
<%@ page import="javax.imageio.*"%>
<%@ page import="java.awt.image.*"%><html>
<head>
<meta http-equiv="Content-Type" content="image/jpeg;charset=GB2312">
<title>showDBImage</title>
</head>
<body>
<%
String showImage ="select * from picture_db where file_name ='01'";
Connection conn = null;
BufferedInputStream inputImage = null;String driverName = "com.mysql.jdbc.Driver";
String dbURL = "jdbc:mysql://localhost:3306/sample_db";
String userID = "root";
String passwd = "yourpassword";try{
Class.forName(driverName).newInstance();
conn = DriverManager.getConnection(dbURL,userID,passwd); Statement
st = conn.createStatement();
ResultSet rs = st.executeQuery(showImage);
while(rs.next()){
Blob blob = (Blob)rs.getBlob("content");
inputImage = new BufferedInputStream(blob.getBinaryStream());
} BufferedImage image = null;
image = ImageIO.read(inputImage);
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputImage.close();
}catch(SQLException e)
{
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
%>
</body>
</html>
为了使用JSP灵活 需要把各种文件储存在数据库中 然后需要的时候将它读取出来显示到客户端 这些文件包括文本 图片 音乐等 人们统称为二进制文件 ：： 二进制文件储存在数据库中的过程是 打开文件 将内容读到缓存区 然后直接连接创建JDBC语句对象
使用该缓冲区的数据 并执行更新 就完成了储存
1 在mysql中创建一个表picture_db
create table picture_db(
file_name varchar(255) not null,
content longblob,
primary key (file_name));
2 java 写储存文件的代码
import java.sql.*;
import java.io.*;
import java.nio.*;
public class UploadImage {
protected Connection dbConnection;
protected String driverName = "com.mysql.jdbc.Driver";
protected String dbURL = "jdbc:mysql://localhost:3306/sample_db";
protected String userID = "root";
protected String passwd = "yourpassword";
public boolean storeImage(String sqlstr,File file){
try{
FileInputStream fin = new FileInputStream(file);
ByteBuffer nbf = ByteBuffer.allocate((int)file.length());
byte[] array = new byte[1024];
int offset =0,length=0;
while((length=fin.read(array))>0){
if(length!=1024)
nbf.put(array,0,length);
else
nbf.put(array);
offset+=length;
}
fin.close();
byte[] content = nbf.array();
return setImage(sqlstr,content);
}catch(FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return false;
}
private boolean setImage(String sqlstr,byte[] in){
boolean flag = false;
if(sqlstr==null)
sqlstr="select * from picture_db";
try{
Class.forName(driverName);
dbConnection = DriverManager.getConnection(dbURL,userID,passwd);
Statement stmt = dbConnection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery(sqlstr);
if(rs.next()){
rs.updateBytes(2,in);
rs.updateRow();
}
else{
rs.moveToInsertRow();
rs.updateString(1,"01");
rs.updateBytes(2,in);
rs.insertRow();
}
rs.close();
flag=true;
}catch(Exception e){
e.printStackTrace();
}
return flag;
}
public static void main(String[] args){
UploadImage upload = new UploadImage();
try{
File file = new File("01.jpg");
if(upload.storeImage(null, file))
System.out.print("ture");
else
System.out.print("False");
}catch(Exception e){
e.printStackTrace();
}
}
}
如果执行成功的话 系统打印 true 否则 false
3 就是将图片读取出来 与储存的过程相反 先建立连接 创建数据库查询JDBC对象 使用该语句来返回二进制结果 保存到文件中
<%@ page contentType = "image/jpeg;charset=GB2312"%>
<%@ page import="java.sql.*"%><%@ page import="java.io.*"%>
<%@ page import="com.sun.image.codec.jpeg.*"%>
<%@ page import="javax.imageio.*"%>
<%@ page import="java.awt.image.*"%><html>
<head>
<meta http-equiv="Content-Type" content="image/jpeg;charset=GB2312">
<title>showDBImage</title>
</head>
<body>
<%
String showImage ="select * from picture_db where file_name ='01'";
Connection conn = null;
BufferedInputStream inputImage = null;String driverName = "com.mysql.jdbc.Driver";
String dbURL = "jdbc:mysql://localhost:3306/sample_db";
String userID = "root";
String passwd = "yourpassword";try{
Class.forName(driverName).newInstance();
conn = DriverManager.getConnection(dbURL,userID,passwd); Statement
st = conn.createStatement();
ResultSet rs = st.executeQuery(showImage);
while(rs.next()){
Blob blob = (Blob)rs.getBlob("content");
inputImage = new BufferedInputStream(blob.getBinaryStream());
} BufferedImage image = null;
image = ImageIO.read(inputImage);
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputImage.close();
}catch(SQLException e)
{
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
%>
</body>
</html>
使用该缓冲区的数据 并执行更新 就完成了储存
1 在mysql中创建一个表picture_db
create table picture_db(
file_name varchar(255) not null,
content longblob,
primary key (file_name));
2 java 写储存文件的代码
import java.sql.*;
import java.io.*;
import java.nio.*;
public class UploadImage {
protected Connection dbConnection;
protected String driverName = "com.mysql.jdbc.Driver";
protected String dbURL = "jdbc:mysql://localhost:3306/sample_db";
protected String userID = "root";
protected String passwd = "yourpassword";
public boolean storeImage(String sqlstr,File file){
try{
FileInputStream fin = new FileInputStream(file);
ByteBuffer nbf = ByteBuffer.allocate((int)file.length());
byte[] array = new byte[1024];
int offset =0,length=0;
while((length=fin.read(array))>0){
if(length!=1024)
nbf.put(array,0,length);
else
nbf.put(array);
offset+=length;
}
fin.close();
byte[] content = nbf.array();
return setImage(sqlstr,content);
}catch(FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return false;
}
private boolean setImage(String sqlstr,byte[] in){
boolean flag = false;
if(sqlstr==null)
sqlstr="select * from picture_db";
try{
Class.forName(driverName);
dbConnection = DriverManager.getConnection(dbURL,userID,passwd);
Statement stmt = dbConnection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery(sqlstr);
if(rs.next()){
rs.updateBytes(2,in);
rs.updateRow();
}
else{
rs.moveToInsertRow();
rs.updateString(1,"01");
rs.updateBytes(2,in);
rs.insertRow();
}
rs.close();
flag=true;
}catch(Exception e){
e.printStackTrace();
}
return flag;
}
public static void main(String[] args){
UploadImage upload = new UploadImage();
try{
File file = new File("01.jpg");
if(upload.storeImage(null, file))
System.out.print("ture");
else
System.out.print("False");
}catch(Exception e){
e.printStackTrace();
}
}
}
如果执行成功的话 系统打印 true 否则 false
3 就是将图片读取出来 与储存的过程相反 先建立连接 创建数据库查询JDBC对象 使用该语句来返回二进制结果 保存到文件中
<%@ page contentType = "image/jpeg;charset=GB2312"%>
<%@ page import="java.sql.*"%><%@ page import="java.io.*"%>
<%@ page import="com.sun.image.codec.jpeg.*"%>
<%@ page import="javax.imageio.*"%>
<%@ page import="java.awt.image.*"%><html>
<head>
<meta http-equiv="Content-Type" content="image/jpeg;charset=GB2312">
<title>showDBImage</title>
</head>
<body>
<%
String showImage ="select * from picture_db where file_name ='01'";
Connection conn = null;
BufferedInputStream inputImage = null;String driverName = "com.mysql.jdbc.Driver";
String dbURL = "jdbc:mysql://localhost:3306/sample_db";
String userID = "root";
String passwd = "yourpassword";try{
Class.forName(driverName).newInstance();
conn = DriverManager.getConnection(dbURL,userID,passwd); Statement
st = conn.createStatement();
ResultSet rs = st.executeQuery(showImage);
while(rs.next()){
Blob blob = (Blob)rs.getBlob("content");
inputImage = new BufferedInputStream(blob.getBinaryStream());
} BufferedImage image = null;
image = ImageIO.read(inputImage);
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputImage.close();
}catch(SQLException e)
{
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
%>
</body>
</html>
为了使用JSP灵活 需要把各种文件储存在数据库中 然后需要的时候将它读取出来显示到客户端 这些文件包括文本 图片 音乐等 人们统称为二进制文件 ：： 二进制文件储存在数据库中的过程是 打开文件 将内容读到缓存区 然后直接连接创建JDBC语句对象
使用该缓冲区的数据 并执行更新 就完成了储存
1 在mysql中创建一个表picture_db
create table picture_db(
file_name varchar(255) not null,
content longblob,
primary key (file_name));
2 java 写储存文件的代码
import java.sql.*;
import java.io.*;
import java.nio.*;
public class UploadImage {
protected Connection dbConnection;
protected String driverName = "com.mysql.jdbc.Driver";
protected String dbURL = "jdbc:mysql://localhost:3306/sample_db";
protected String userID = "root";
protected String passwd = "yourpassword";
public boolean storeImage(String sqlstr,File file){
try{
FileInputStream fin = new FileInputStream(file);
ByteBuffer nbf = ByteBuffer.allocate((int)file.length());
byte[] array = new byte[1024];
int offset =0,length=0;
while((length=fin.read(array))>0){
if(length!=1024)
nbf.put(array,0,length);
else
nbf.put(array);
offset+=length;
}
fin.close();
byte[] content = nbf.array();
return setImage(sqlstr,content);
}catch(FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return false;
}
private boolean setImage(String sqlstr,byte[] in){
boolean flag = false;
if(sqlstr==null)
sqlstr="select * from picture_db";
try{
Class.forName(driverName);
dbConnection = DriverManager.getConnection(dbURL,userID,passwd);
Statement stmt = dbConnection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery(sqlstr);
if(rs.next()){
rs.updateBytes(2,in);
rs.updateRow();
}
else{
rs.moveToInsertRow();
rs.updateString(1,"01");
rs.updateBytes(2,in);
rs.insertRow();
}
rs.close();
flag=true;
}catch(Exception e){
e.printStackTrace();
}
return flag;
}
public static void main(String[] args){
UploadImage upload = new UploadImage();
try{
File file = new File("01.jpg");
if(upload.storeImage(null, file))
System.out.print("ture");
else
System.out.print("False");
}catch(Exception e){
e.printStackTrace();
}
}
}
如果执行成功的话 系统打印 true 否则 false
3 就是将图片读取出来 与储存的过程相反 先建立连接 创建数据库查询JDBC对象 使用该语句来返回二进制结果 保存到文件中
<%@ page contentType = "image/jpeg;charset=GB2312"%>
<%@ page import="java.sql.*"%><%@ page import="java.io.*"%>
<%@ page import="com.sun.image.codec.jpeg.*"%>
<%@ page import="javax.imageio.*"%>
<%@ page import="java.awt.image.*"%><html>
<head>
<meta http-equiv="Content-Type" content="image/jpeg;charset=GB2312">
<title>showDBImage</title>
</head>
<body>
<%
String showImage ="select * from picture_db where file_name ='01'";
Connection conn = null;
BufferedInputStream inputImage = null;String driverName = "com.mysql.jdbc.Driver";
String dbURL = "jdbc:mysql://localhost:3306/sample_db";
String userID = "root";
String passwd = "yourpassword";try{
Class.forName(driverName).newInstance();
conn = DriverManager.getConnection(dbURL,userID,passwd); Statement
st = conn.createStatement();
ResultSet rs = st.executeQuery(showImage);
while(rs.next()){
Blob blob = (Blob)rs.getBlob("content");
inputImage = new BufferedInputStream(blob.getBinaryStream());
} BufferedImage image = null;
image = ImageIO.read(inputImage);
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputImage.close();
}catch(SQLException e)
{
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
%>
</body>
</html>
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