package star.july.practise; /*** JDBC進階：調(diào)用數(shù)據(jù)庫，將文件或其他字節(jié)文件存入數(shù)據(jù)庫，* 再從數(shù)據(jù)庫取出寫回硬盤*/ import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.Date;import org.junit.Test;import star.july.util.JDBCUtil;public class JDBC_a_addtable {//獲取當前日期Date date = new Date();int day = date.getDate();int month = date.getMonth();String time = (month+1)+"月"+day+"日";//使用JUtil方法測試@Testpublic void addFile(){try {//調(diào)用靜態(tài)方法Connection conn = JDBCUtil.connect();String sql = "insert into addtable(name,file,addtime,author) values(?,?,?,?)";PreparedStatement stmt = conn.prepareStatement(sql);//讀取文件File file = new File("F:/testwork/user.xml");InputStream in = new FileInputStream(file); //構建輸入通道//獲取文件名字stmt.setString(1, file.getName());//設置文件類型stmt.setBlob(2, in);stmt.setString(3,time);stmt.setString(4, "star");//執(zhí)行更新stmt.executeUpdate();JDBCUtil.close(conn, stmt);} catch (Exception e) {e.printStackTrace();}}@Testpublic void write(){try {Connection conn = JDBCUtil.connect();String sql = "select * from addtable where id=?";PreparedStatement stmt = conn.prepareStatement(sql);//設置id的值stmt.setInt(1, 1);//執(zhí)行查詢ResultSet rs = stmt.executeQuery();if(rs.next()){InputStream is = rs.getBlob("file").getBinaryStream();//寫回硬盤FileOutputStream out = new FileOutputStream(new File("F:/testwork/user2.xml"));;byte[] b = new byte[1024];int len = 0 ;if((len = is.read(b))!= -1){out.write(b,0,len); //讀取字節(jié)并寫進硬盤}}//關閉資源JDBCUtil.close(conn, stmt);} catch (Exception e) {e.printStackTrace();}}}

總結

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