复制代码代码如下:
paket com.wanmei.meishu;
impor java.io.FileInputStream;
impor java.io.FileOutputStream;
impor java.io.FileReader;
impor java.io.InputStream;
impor java.io.OutputStream;
impor java.sql.Koneksi;
impor java.sql.DriverManager;
impor java.sql.PreparedStatement;
impor java.sql.ResultSet;
impor java.sql.SQLException;
impor java.util.Properti;
impor Oracle.sql.BLOB;
kelas publik BlobUtil {
BlobUtil statis pribadi bu;
pribadi String env;
public static BlobUtil getInstance(String env) {
bu = BlobUtil baru();
bu.env = env;
kembali bu;
}
/**
* <p>得到数据库链接</p>
* @kembali
* @melempar Pengecualian
*/
Koneksi pribadi getConnection() memunculkan Pengecualian {
String driver = "Oracle.jdbc.driver.OracleDriver";
Class.forName(pengemudi);
String env = ini.env;
Properti pro = Properti baru();
// 读取kelas 目录下的配置文件
pro.load(fileReader baru(Class.class.getResource("/config.properties").getFile()));
String host = pro.getProperty(env + ".host");
Basis data string = pro.getProperty(env + ".database");
String nama pengguna = pro.getProperty(env + ".username");
String kata sandi = pro.getProperty(env + ".password");
String port = pro.getProperty(env + ".port");
String url = "jdbc:Oracle:thin:@" + host + ":" + port +":" + basis data;
return DriverManager.getConnection(url, nama pengguna, kata sandi);
}
/**
* <p>传入项目,任务,附件名称,文件路径,写入数据库</p>
* @param projectId
* @param taskId
* @paramnamafile
* @file param
* @kembali 返回是否成功
*/
tulis boolean publik(String projectId, String taskId, String fileName, String file) {
Sambungan koneksi = null;
HasilSet rs = null;
Pernyataan yang Disiapkan ps = null;
gumpalan gumpalan = null;
bendera boolean = false;
mencoba {
samb = getConnection();
samb.setAutoCommit(salah);
String sql = "MASUKKAN KE PS_ZP_PRJ_WBS_BLOB BLB(ZP_PRJ_ID, ZZ_SEQ_NUM, ZZ_FILE_NAME, ZZ_IMAGE_BLOB) VALUES(?, ? ,? ,empty_blob())";
ps = samb.prepareStatement(sql);
ps.setString(1, projectId);
ps.setString(2, taskId);
ps.setString(3, Namafile);
ps.executeUpdate();
sql = "PILIH ZZ_IMAGE_BLOB DARI PS_ZP_PRJ_WBS_BLOB DIMANA ZP_PRJ_ID = ? DAN ZZ_SEQ_NUM = ? DAN ZZ_FILE_NAME = ? UNTUK UPDATE";
ps = samb.prepareStatement(sql);
ps.setString(1, projectId);
ps.setString(2, taskId);
ps.setString(3, Namafile);
rs = ps.executeQuery();
if(rs.next()) {
gumpalan = (BLOB) rs.getBlob(1);
}
InputStream di = FileInputStream baru(file);
OutputStream keluar = gumpalan.setBinaryStream(1L);
byte[] penyangga = byte baru[1024];
int panjang = -1;
while ((panjang = masuk.baca(buffer)) != -1){
out.write(buffer, 0, panjang);
}
melampirkan();
keluar.dekat();
samb.commit();
samb.setAutoCommit(benar);
bendera = benar;
}
tangkapan(Pengecualian e) {
jika(sambungan != nol) {
mencoba {
samb.rollback();
} tangkapan (SQLException e1) {
e1.printStackTrace();
}
}
}
Akhirnya {
mencoba {
rs.close();
ps.tutup();
samb.close();
}
tangkapan(Pengecualian e) {
e.printStackTrace();
}
}
bendera kembali;
}
/**
* <p>根据项目Id,任务Id,文件名读取数据库blob字段文件,写入指定的文件路径</p>
* @param projectId
* @param taskId
* @paramnamafile
* @file param
* @kembali 返回是否成功
*/
baca boolean publik(String projectId, String taskId, String fileName, String file) {
Sambungan koneksi = null;
HasilSet rs = null;
Pernyataan yang Disiapkan ps = null;
gumpalan gumpalan = null;
bendera boolean = false;
mencoba {
samb = getConnection();
String sql = "PILIH ZZ_IMAGE_BLOB DARI PS_ZP_PRJ_WBS_BLOB DI MANA ZP_PRJ_ID = ? DAN ZZ_SEQ_NUM = ? DAN ZZ_FILE_NAME = ?";
ps = samb.prepareStatement(sql);
ps.setString(1, projectId);
ps.setString(2, taskId);
ps.setString(3, Namafile);
rs = ps.executeQuery();
if(rs.next()) {
gumpalan = (BLOB) rs.getBlob(1);
}
InputStream di = blob.getBinaryStream();
byte[] buf = byte baru[1024];
int byteIn = 0;
FileOutputStream keluar = FileOutputStream baru(file);
while ((bytesIn = in.read(buf, 0, 1024)) != -1) {
keluar.tulis(buf, 0, byteIn);
}
melampirkan();
keluar.tutup();
bendera = benar;
}
tangkapan(Pengecualian e) {
e.printStackTrace();
}
Akhirnya {
mencoba {
rs.close();
ps.tutup();
samb.close();
}
tangkapan(Pengecualian e) {
e.printStackTrace();
}
}
bendera kembali;
}
public static void main(String[] args) {
BlobUtil bu = BlobUtil.getInstance("MSDEV");
System.out.println(bu.write("CB", "001", "image1", "D://61e44b02jw1dw4xbp2zo6j.jpg"));
System.out.println(bu.read("CB", "001", "image1", "D://2.jpg"));
}
}