用jdbc在Oracle中存取BLOB對象實作檔案的上傳和下載下傳

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聽

鏁版嵁搴?Oracle 9i

搴旂敤鏈嶅姟鍣?BEA Weblogic 8.11

寮€鍙戝伐鍏?JBuilder X

1锛幝?BLOB鍏ュ簱

锛?锛壜犅犅犅犅犅?鐩存帴鑾峰緱鏁版嵁搴撹繛鎺ョ殑鎯呭喌

杩欐槸Oracle鎻愪緵鐨勬爣鍑嗘柟寮忥紝鍏堟彃鍏ヤ竴涓┖BLOB瀵矽薄锛岀劧鍚嶶pdate杩欎釜绌哄璞°€備唬鐮佸涓嬶細

//寰楀埌鏁版嵁搴撹繛鎺ワ紙椹卞姩鍖呮槸weblogic鐨勶紝娌℃湁涓嬭澆浠諱綍鏂扮増鏈級

Class.forName("oracle.jdbc.driver.OracleDriver");

Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:testdb", "test","test");

//澶勭悊浜嬪姟

con.setAutoCommit(false);

Statement st = con.createStatement();

//鎻掑叆涓€涓┖瀵矽薄

st.executeUpdate("insert into BLOBIMG聽 values(103,empty_blob())");

//鐢╢or update鏂瑰紡閿佸畾鏁版嵁琛?

ResultSet rs = st.executeQuery("select contents from聽 BLOBIMG聽 where聽 id=103 for update");

if (rs.next()) {

聽聽 //寰楀埌java.sql.Blob瀵矽薄锛岀劧鍚嶤ast涓簅racle.sql.BLOB

oracle.sql.BLOB blob = (oracle.sql.BLOB) rs.getBlob(1).;

聽聽 //鍒版暟鎹簱鐨勮緭鍑烘祦

OutputStream outStream = blob.getBinaryOutputStream();

聽聽 //杩欓噷鐢ㄤ竴涓枃浠舵ā鎷熻緭鍏ユ祦

File file = new File("d://proxy.txt");

聽 InputStream fin = new FileInputStream(file);

//灏嗚緭鍏ユ祦鍐欏埌杈撳嚭娴?

byte[] b = new byte[blob.getBufferSize()];

聽聽聽聽聽聽聽 int len = 0;

聽聽聽聽聽聽聽 while ( (len = fin.read(b)) != -1) {

聽聽聽聽聽聽聽聽聽 outStream.write(b, 0, len);

聽聽聽聽聽聽聽聽聽 //blob.putBytes(1,b);

聽聽聽聽聽聽聽 }

聽聽 //渚濇鍏抽棴锛堟敞鎰忛『搴忥級

fin.close();

聽聽 outStream.flush();

聽聽 outStream.close();

聽聽 con.commit();

聽聽 con.close();

锛?锛壜犅犅犅犅犅?閫氳繃JNDI鑾峰緱鏁版嵁搴撹繛鎺?

鍦╓eblogic涓厤缃埌Oracle鐨凧DBC Connection Pool鍜孌ataSource锛岀粦瀹氬埌Context涓紝鍋囧畾缁戝畾鍚嶄負鈥漮rads鈥濄€?

涓轟簡寰楀埌鏁版嵁搴撹繛鎺ワ紝鍋氫竴涓繛鎺ュ伐鍘傦紝涓昏浠ｇ爜濡備笅锛?

Context context = new InitialContext();

ds = (DataSource) context.lookup("orads");

return ds.getConnection();

浠ヤ笅鏄疊LOB鍐欏叆鏁版嵁搴撶殑浠ｇ爜锛?

Connection con = ConnectionFactory.getConnection();

con.setAutoCommit(false);

Statement st = con.createStatement();

st.executeUpdate("insert into BLOBIMG values(103,empty_blob())");

ResultSet rs = st.executeQuery(

聽聽聽聽聽聽聽聽聽 "select contents from聽 BLOBIMG聽 where聽 id=103 for update");

if (rs.next()) {

聽聽聽 //涓婇潰浠ｇ爜涓嶅彉

//杩欓噷涓嶈兘鐢╫racle.sql.BLOB锛屼細鎶lassCast 寮傚父

weblogic.jdbc.vendor.oracle.OracleThinBlobblob = (weblogic.jdbc.vendor.oracle.OracleThinBlob) rs.getBlob(1);

聽聽聽聽 //浠ュ悗浠ｇ爜涔熶笉鍙?

OutputStream outStream = blob.getBinaryOutputStream();

File file = new File("d://proxy.txt");

聽 InputStream fin = new FileInputStream(file);

byte[] b = new byte[blob.getBufferSize()];

聽聽聽聽聽聽聽 int len = 0;

聽聽聽聽聽聽聽 while ( (len = fin.read(b)) != -1) {

聽聽聽聽聽聽聽聽聽 outStream.write(b, 0, len);

聽聽聽聽聽聽聽 }

fin.close();

聽聽 outStream.flush();

聽聽 outStream.close();

聽聽 con.commit();

聽聽 con.close();

2锛幝?BLOB鍑哄簱

浠庢暟鎹簱涓鍑築LOB鏁版嵁娌℃湁涓婅堪鐢變簬杩炴帴姹犵殑涓嶅悓甯︽潵鐨勫樊寮傦紝鍙渶瑕丣2SE鐨勬爣鍑嗙被java.sql.Blob灏卞彲浠ュ彇寰楄緭鍑烘祦锛堟敞鎰忓尯鍒玧ava.sql.Blob鍜宱racle.sql.BLOB锛夈€備唬鐮佸涓嬶細

Connection con = ConnectionFactory.getConnection();

con.setAutoCommit(false);

Statement st = con.createStatement();

//杩欓噷鐨凷QL璇彞涓嶅啀闇€瑕佲€漟or update鈥?

ResultSet rs = st.executeQuery(

聽聽聽聽聽聽聽聽聽 "select contents from聽 BLOBIMG聽 where聽 id=103 ");

if (rs.next()) {

聽聽 java.sql.Blob blob = rs.getBlob(1);

聽聽 InputStream ins = blob.getBinaryStream();

聽聽聽 //鐢ㄦ枃浠舵ā鎷熻緭鍑烘祦

File file = new File("d://output.txt");

聽聽 OutputStream fout = new FileOutputStream(file);

聽聽聽聽 //涓嬮潰灏咮LOB鏁版嵁鍐欏叆鏂囦歡

聽聽聽 byte[] b = new byte[1024];

聽聽聽 int len = 0;

聽聽聽聽聽聽聽 while ( (len = ins.read(b)) != -1) {

聽聽聽聽聽聽聽聽聽 fout.write(b, 0, len);

聽聽聽聽聽聽聽 }

聽 //渚濇鍏抽棴

聽 fout.close();

聽 ins.close();

聽 con.commit();

聽 con.close();

浠庢暟鎹簱璇誨彇BLOB鐒跺悗淇濆瓨鍒闆鎴風纾佺洏涓?

杩欐浠ｇ爜鏈夌偣璇″紓锛屾墽琛屽悗灏嗕細寮瑰嚭鏂囦歡淇濆瓨瀵矽瘽绐楀彛锛屽皢BLOB鏁版嵁璇誨嚭淇濆瓨鍒版湰鍦版枃浠躲€傚叏鏂囧垪鍑哄涓嬶細

<%@ page contentType="text/html; charset=GBK" import="java.io.*" import="java.sql.*" import="test.global.ConnectionFactory"%><%

聽聽聽聽聽 Connection con = ConnectionFactory.getConnection();

聽聽聽聽聽 con.setAutoCommit(false);

聽聽聽聽聽 Statement st = con.createStatement();

聽聽聽聽聽 ResultSet rs = st.executeQuery(

聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 "select contents from聽 BLOBIMG聽 where聽 id=103 ");

聽聽聽聽聽 if (rs.next()) {

聽聽聽聽聽聽聽 Blob blob = rs.getBlob(1);

聽聽聽聽聽聽聽 InputStream ins = blob.getBinaryStream();

聽聽聽聽聽聽聽 response.setContentType("application/unknown");

聽聽聽聽聽聽聽 response.addHeader("Content-Disposition", "attachment; filename="+"output.txt");

聽聽聽聽聽聽聽 OutputStream outStream = response.getOutputStream();

聽聽聽聽聽聽聽 byte[] bytes = new byte[1024];

聽聽聽聽聽聽聽 int len = 0;

聽聽聽聽聽聽聽 while ((len=ins.read(bytes))!=-1) {

聽聽聽聽聽聽聽聽聽聽聽 outStream.write(bytes,0,len);

聽聽聽聽聽聽聽 }

聽聽聽聽聽聽聽 ins.close();

聽聽聽聽聽聽聽 outStream.close();

聽聽聽聽聽聽聽 outStream = null;

聽聽聽聽聽聽聽 con.commit();

聽聽聽聽聽聽聽 con.close();

聽聽聽聽聽 }

%>