package cn.com.songjy.test.db;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class MySQLText {
private static final Log log = LogFactory.getLog(MySQLText.class);
private static final String id = "2";
private static final BufferedInputStream bufferedInputStream = new BufferedInputStream(
MySQLText.class.getClassLoader().getResourceAsStream(
"cn/com/songjy/test/db/mysql.properties"));
private static final Properties props = new Properties();
static {
try {
props.load(bufferedInputStream);
Class.forName(props.getProperty("driver"));
} catch (IOException e) {
log.error(e.getMessage(), e);
} catch (ClassNotFoundException e) {
log.error(e.getMessage(), e);
} finally {
try {
if (null != bufferedInputStream)
bufferedInputStream.close();
} catch (IOException e) {
log.error(e.getMessage(), e);
}
}
}
public Connection getConnection() throws SQLException {
log.info(props.getProperty("url"));
return DriverManager.getConnection(props.getProperty("url"),
props.getProperty("user"), props.getProperty("password"));
}
// 使用JDBC保存大文本
public void save_text() throws SQLException, IOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
BufferedReader bufferedReader = null;
try {
connection = getConnection();
preparedStatement = connection
.prepareStatement("INSERT INTO testclob(id,resume) VALUES(?,?)");
preparedStatement.setString(1, id);
File txt = new File(
"src/main/java/cn/com/songjy/test/db/MySQLText.java");
bufferedReader = new BufferedReader(new FileReader(txt));
// preparedStatement.setCharacterStream(2, reader, txt.length());
preparedStatement.setCharacterStream(2, bufferedReader);
log.info(preparedStatement.executeUpdate() > 0 ? "保存文本成功"
: "保存文本失败");
} finally {
if (null != bufferedReader)
bufferedReader.close();
if (null != preparedStatement)
preparedStatement.close();
if (null != connection)
connection.close();
}
}
// 使用JDBC查询大文本
public void query_text() throws SQLException, IOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
try {
connection = getConnection();
preparedStatement = connection
.prepareStatement("SELECT id,resume FROM testclob WHERE id = ?");
preparedStatement.setString(1, id);
resultSet = preparedStatement.executeQuery();
while (true == resultSet.next()) {
BufferedReader bufferedReader = null;
BufferedWriter bufferedWriter = null;
try {
bufferedReader = new BufferedReader(
resultSet.getCharacterStream("resume"));
bufferedWriter = new BufferedWriter(
new FileWriter(
"src/main/java/cn/com/songjy/test/db/MySQLText.txt"));
char[] buffer = new char[512];// 每次读取512个字符
for (int len = 0; (len = bufferedReader.read(buffer)) > 0;) {
bufferedWriter.write(buffer, 0, len);
}
} finally {
if (null != bufferedWriter)
bufferedWriter.close();
if (null != bufferedReader)
bufferedReader.close();
}
}
} finally {
if (null != resultSet)
resultSet.close();
if (null != preparedStatement)
preparedStatement.close();
if (null != connection)
connection.close();
}
}
// JDBC保存二进制数据
public void save_binary_stream() throws SQLException, IOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
BufferedInputStream bufferedInputStream = null;
try {
File jpg = new File(
"src/main/java/cn/com/songjy/test/db/Jellyfish.jpg");
bufferedInputStream = new BufferedInputStream(new FileInputStream(
jpg));
connection = getConnection();
preparedStatement = connection
.prepareStatement("INSERT INTO testblob(id, image) VALUES (?,?)");
preparedStatement.setString(1, id);
// preparedStatement.setBinaryStream(2, inputStream, jpg.length());
preparedStatement.setBinaryStream(2, bufferedInputStream);
log.info(preparedStatement.executeUpdate() > 0 ? "图片保存成功"
: "图片保存失败");
} finally {
if (null != bufferedInputStream)
bufferedInputStream.close();// 记得关闭，否则可能导致该文件占用而影响其它操纵（删除等）,可参阅//http://www.coder.xxx/archives/32.html
if (null != preparedStatement)
preparedStatement.close();
if (null != connection)
connection.close();
}
}
// JDBC查询二进制数据
public void query_binary_stream() throws SQLException, IOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
try {
connection = getConnection();
preparedStatement = connection
.prepareStatement("SELECT id, image FROM testblob WHERE id = ?");
preparedStatement.setString(1, id);
resultSet = preparedStatement.executeQuery();
while (true == resultSet.next()) {
BufferedOutputStream bufferedOutputStream = null;
BufferedInputStream bufferedInputStream = null;
try {
bufferedInputStream = new BufferedInputStream(
resultSet.getBinaryStream("image"));
bufferedOutputStream = new BufferedOutputStream(
new FileOutputStream(
"src/main/java/cn/com/songjy/test/db/1.jpg"));
byte[] buffer = new byte[1024];// 每次读取1k
for (int len = 0; (len = bufferedInputStream.read(buffer)) > 0;) {
bufferedOutputStream.write(buffer, 0, len);
// bufferedOutputStream.flush();//关闭的时候会自动将缓存中的数据写入文件
}
} finally {
if (null != bufferedOutputStream)
bufferedOutputStream.close();
if (null != bufferedInputStream)
bufferedInputStream.close();
}
}
} finally {
if (null != resultSet)
resultSet.close();
if (null != preparedStatement)
preparedStatement.close();
if (null != connection)
connection.close();
}
}
public static void main(String[] args) throws SQLException, IOException {
// new MySQLText().save_text();
// new MySQLText().query_text();
// new MySQLText().save_binary_stream();
new MySQLText().query_binary_stream();
}
}
/*
*
* create table testclob
*
* (
*
* id varchar(40) primary key,
*
* resume text
*
* );
*
* create table testblob
*
* (
*
* id varchar(40) primary key,
*
* image MediumBlob
*
* );
*/
备注：保存二进制文件时注意选择类型，详见 mysql blob大小配置介绍
oracle存取二进制文件（图片）
JDBC 学习笔记（二）—— 大数据+存储过程+批处理+事务管理
可能会遇到的问题： com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException
Java读文件的一些归纳总结
InputStream未关闭导致文件被占用从而引发的问题
BufferedInputStream与BufferedOutputStream的使用
public void resource() throws IOException {
Resource resource = new UrlResource(
"http://127.0.0.1:8008/monitor/file/navicat8_mysql_cs.exe");
System.out.println(resource.getFilename());
File f = new File(resource.getFilename());
System.out.println(f.length());
InputStream src_in = resource.getInputStream();
BufferedInputStream in = new BufferedInputStream(src_in);
byte[] temp = new byte[1024];
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(f));
while (-1 != (in.read(temp))) {
out.write(temp);
}
out.flush();
out.close();
in.close();
src_in.close();
System.out.println(f.length());
}