有这样一个需求，需要将原本存储在数据库中的文档转存至文件系统中，于是写了一个简单的程序完成此功能，代码如下：

Java代码

复制代码代码如下:

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import org.dbunit.util.Base64;

public class ReadBlob {

/**

* @param args

*/

public static void main(String[] args) throws Exception {

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Connection conn = DriverManager.getConnection(

"jdbc:sqlserver://localhost:1433;DatabaseName=test1", "sa",

"123456");

PreparedStatement ps = conn.prepareStatement("select * from aa");

ResultSet rs = ps.executeQuery();

while(rs.next()){

String fileName = rs.getString("FileName");

String content = rs.getString("Content");

byte[] byte_content = Base64.decode(content);

generateFile(byte_content, "D://doc", fileName);

}

conn.close();

}

/**

* 根据byte数组，生成文件

*/

public static void generateFile(byte[] bfile, String filePath,String fileName) {

BufferedOutputStream bos = null;

FileOutputStream fos = null;

File file = null;

try {

File dir = new File(filePath);

if(!dir.exists()&&dir.isDirectory()){

dir.mkdirs();

}

file = new File(filePath+"//"+fileName);

fos = new FileOutputStream(file);

bos = new BufferedOutputStream(fos);

bos.write(bfile);

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bos != null) {

try {

bos.close();

} catch (IOException e1) {

e1.printStackTrace();

}

}

if (fos != null) {

try {

fos.close();

} catch (IOException e1) {

e1.printStackTrace();

}

}

}

}

}