Java读取Oracle BLOB字段

/**
* JDBC连接数据库并写入BLOB字段
* @author DaHai
*
*/
public class OracleBlob {
public static void main(String[] args) {
OracleBlob ob= new OracleBlob ();
ob.insert("c:\\Test.txt");
}

public Connection getConnection() {
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:test", "scott", "tigger");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}

public void insert(String str) {
Connection conn = getConnection();
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
conn.setAutoCommit(false);
pstmt = conn.prepareStatement("insert into test (wygjz,wdmc,wd) values (?,?,empty_blob())");
pstmt.setString(1, "163");
pstmt.setString(2, "dahai");
pstmt.executeUpdate();
pstmt = conn.prepareStatement("select wd from test where wygjz=163 for update");
rs = pstmt.executeQuery();
while (rs.next()) {
oracle.sql.BLOB blob = (oracle.sql.BLOB)rs.getBlob(1);
OutputStream os = blob.getBinaryOutputStream();
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(str));
byte[] buf = new byte[2048];
int len = 0;
if ((len = bis.read(buf)) != -1) {
os.write(buf, 0, len);
os.flush();
}
os.close();
bis.close();
}
conn.commit();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
try {
if(conn!=null){
conn.rollback();
}
} catch (SQLException e1) {
e1.printStackTrace();
}
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(rs!=null){
rs.close();
rs = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if(pstmt!=null){
pstmt.close();
pstmt = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
try {
if(conn!=null){
conn.close();
conn = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}

}


如果用Spring配置的话,可以将上面的getConnection()方法替换成

public Connection getConnection(){
Connection conn = null;
ApplicationContext ctx = new ClassPathXmlApplicationContext("dbconfigs.xml");
        DataSource ds = (DataSource) ctx.getBean("dataSource");
try{
conn = ds.getConnection();
if(conn != null){
System.out.println("数据库连接成功！");
}

}catch(SQLException e){
e.printStackTrace();
}
return conn;
}