J2EE在Oracle中存取BLOB对象实现文件的上传和下载

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瀛樺彇BLOB鍑虹幇杩欎箞澶氶棶棰橈紝鎴戣涓哄ぇ鍗婃槸鐢辨暟鎹簱寮€鍙戝晢銆佸簲鐢ㄦ湇鍔″櫒鍟嗗湪JDBC椹卞姩涓婄殑涓嶅吋瀹规€у甫鏉ョ殑銆傝€屽疄闄呭簲鐢ㄤ腑锛屾瘡涓汉鐨勫紑鍙戣繍琛岀幆澧冧笉鍚岋紝浣垮緱鏌愪釜缃戝弸鐨剆olution娌℃湁鍔炴硶鍦ㄥ埆浜虹殑搴旂敤涓噸鐜帮紝浠ヨ嚦浜庨獋澹颁竴鐗囥€傝嚦浜庝负浠€涔堜細涓嶅吋瀹广€佹湁鍝簺闂锛屾垜娌℃湁鏃堕棿鍘诲紕娓咃紝杩欓噷鍙璇存垜浠€庢牱瑙ｅ喅浜嗛棶棰樼殑銆?

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鏁版嵁搴?Oracle 9i

搴旂敤鏈嶅姟鍣?BEA Weblogic 8.11

寮€鍙戝伐鍏?JBuilder X

鍦↗SP瀹炵幇鏂囦欢Upload/Download鍙互鍒嗘垚杩欐牱鍑犲潡 锛氭枃浠舵彁浜ゅ埌褰㈡垚InputSteam锛汭nputSteam浠LOB鏍煎紡鍏ュ簱锛涙暟鎹粠搴撲腑璇诲嚭涓篒nputSteam锛汭nputStream杈撳嚭鍒伴〉闈㈠舰鎴愪笅杞芥枃浠躲€傚厛璇碆LOB鍚с€?

1锛?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瀵硅薄锛岀劧鍚嶶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℃湁涓嬭浇浠讳綍鏂扮増鏈級

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

Connection con = DriverManager.getConnection(

聽聽聽聽聽聽聽聽聽 "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┖瀵硅薄

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

//鐢╢or update鏂瑰紡閿佸畾鏁版嵁琛?

ResultSet rs = st.executeQuery(

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

if (rs.next()) {

聽聽 //寰楀埌java.sql.Blob瀵硅薄锛岀劧鍚嶤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");

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 }

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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负鈥漮rads鈥濄€?

涓轰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 BLOBIMG where 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 //浠ュ悗浠ｇ爜涔熶笉鍙?

OutputStream outStream = blob.getBinaryOutputStream();

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

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?BLOB鍑哄簱

浠庢暟鎹簱涓鍑築LOB鏁版嵁娌℃湁涓婅堪鐢变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 BLOBIMG where 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 //涓嬮潰灏咮LOB鏁版嵁鍐欏叆鏂囦欢

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 }

//渚濇鍏抽棴

fout.close();

ins.close();

con.commit();

con.close();

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3锛?浠嶫SP椤甸潰鎻愪氦鏂囦欢鍒版暟鎹簱

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锛?锛壜犅犅犅犅犅?鎻愪氦椤甸潰鐨勪唬鐮佸涓嬶細

<form action="handle.jsp" enctype="multipart/form-data" method="post" >

<input type="hidden" name="id" value="103"/>

<input type="file" name="fileToUpload">

<input type="submit" value="Upload">

</form>

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锛?锛壜犅犅犅犅犅?鐢变簬JSP娌℃湁鎻愪緵鏂囦欢涓婁紶鐨勫鐞嗚兘鍔涳紝鍙湁浣跨敤绗笁鏂圭殑寮€鍙戝寘銆傜綉缁滀笂寮€婧愮殑鍖呮湁寰堝锛屾垜浠繖閲岄€夋嫨Apache Jakarta鐨凢ileUpload锛屽湪http://jakarta.apache.org/commons/fileupload/index.html 鍙互寰楀埌涓嬭浇鍖呭拰瀹屾暣鐨凙PI鏂囨。銆傛硶濂ヤ负adajspException

澶勭悊椤甸潰锛坔andle.jsp锛夌殑浠ｇ爜濡備笅

<%

boolean isMultipart = FileUpload.isMultipartContent(request);

聽聽聽 if (isMultipart) {

聽聽聽聽聽 // 寤虹珛涓€涓柊鐨刄pload瀵硅薄

聽聽聽聽聽 DiskFileUpload upload = new DiskFileUpload();

聽聽聽 // 璁剧疆涓婅浇鏂囦欢鐨勫弬鏁?

聽聽聽 //upload.setSizeThreshold(yourMaxMemorySize);

聽聽聽 //upload.setSizeMax(yourMaxRequestSize);

聽聽聽 String rootPath = getServletConfig().getServletContext().getRealPath("/") ;

聽聽聽 upload.setRepositoryPath(rootPath+"/uploads");

聽聽聽聽 // 鍒嗘瀽request涓殑浼犳潵鐨勬枃浠舵祦锛岃繑鍥濱tem鐨勯泦鍚堬紝

聽聽聽聽 // 杞Items锛屽鏋滀笉鏄〃鍗曞煙锛屽氨鏄竴涓枃浠跺璞°€?

聽聽聽聽聽 List items = upload.parseRequest(request);

聽聽聽聽聽 Iterator iter = items.iterator();

聽聽聽聽聽 while (iter.hasNext()) {

聽聽聽聽聽聽聽 FileItem item = (FileItem) iter.next();

聽聽聽聽聽聽聽 //濡傛灉鏄枃浠跺璞?

if (!item.isFormField()) {

聽聽聽聽聽聽聽聽聽 //濡傛灉鏄枃鏈枃浠讹紝鍙互鐩存帴鏄剧ず

聽聽聽聽聽聽聽聽聽 //out.println(item.getString());

聽聽聽聽聽聽聽聽聽 //灏嗕笂杞界殑鏂囦欢鍐欏埌鏈嶅姟鍣ㄧ殑WEB-INFwebstart涓嬶紝鏂囦欢鍚嶄负test.txt

聽聽聽聽聽聽聽聽聽 //File uploadedFile = new File(rootPath+"/uploads/test.txt");

聽聽聽聽聽聽聽聽聽 //item.write(uploadedFile);

聽聽聽聽聽聽聽 //涓嬮潰鐨勪唬鐮佹槸灏嗘枃浠跺叆搴擄紙鐣ワ級锛?

聽聽聽聽聽聽聽 //娉ㄦ剰杈撳叆娴佺殑鑾峰彇

鈥?

InputStream uploadedStream = item.getInputStream();

鈥?

聽聽聽聽聽聽聽 }

聽聽聽聽聽聽聽 //鍚﹀垯鏄櫘閫氳〃鍗?

else{

聽聽聽聽聽聽聽聽聽 out.println("FieldName: " + item.getFieldName()+"<br>");

聽聽聽聽聽聽聽聽聽 out.println("Value: "+item.getString()+"<br>");聽聽聽聽聽聽聽 }

聽聽聽聽聽 }

聽聽聽 }

%>

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4锛?浠庢暟鎹簱璇诲彇BLOB鐒跺悗淇濆瓨鍒板鎴风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欢淇濆瓨瀵硅瘽绐楀彛锛屽皢BLOB鏁版嵁璇诲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 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 BLOBIMG where 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 }

%>

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