JDBC保存和读取大文本数据类型

public class App_blob {

// 全局参数
private Connection con;
private Statement stmt;
private PreparedStatement pstmt;
private ResultSet rs;

@Test
// 1. 二进制数据类型   ( 写longblob)
public void testSaveText() {
String sql = "insert into test(img) values(?)";
try {
// 连接
con = JdbcUtil.getConnection();
// pstmt 对象
pstmt = con.prepareStatement(sql);
// 获取图片流
InputStream in = App_text.class.getResourceAsStream("7.jpg");
pstmt.setBinaryStream(1, in);

// 执行保存图片
pstmt.execute();

// 关闭
in.close();

} catch (Exception e) {
e.printStackTrace();
} finally {
JdbcUtil.closeAll(con, pstmt, null);
}
}

@Test
// 2. 读取大文本数据类型   ( 读longblob)
public void testGetAsText() {
String sql = "select img from  test where id=2;";
try {
// 连接
con = JdbcUtil.getConnection();
// pstmt 对象
pstmt = con.prepareStatement(sql);
// 读取
rs = pstmt.executeQuery();
if (rs.next()) {
// 获取图片流
InputStream in = rs.getBinaryStream("img");
// 图片输出流
FileOutputStream out = new FileOutputStream(new File("c://1.jpg"));
int len = -1;
byte b[] = new byte[1024];
while ((len = in.read(b)) != -1) {
out.write(b, 0, len);
}
// 关闭
out.close();
in.close();
}

} catch (Exception e) {
e.printStackTrace();
} finally {
JdbcUtil.closeAll(con, pstmt, null);
}
}
}