java读取blob全身乱码
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一、BLOB操作 1、入库 (1)JDBC方式 //通过JDBC获得数据库连接 Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:testdb", "test", "test"); con.setAutoCommit(false); Statement st = con.createStatement(); //插入一个空对象empty_blob() st.executeUpdate("insert into TESTBLOB (ID, NAME, BLOBATTR) values (1, "thename", empty_blob())"); //锁定数据行进行更新,注意“for update”语句 ResultSet rs = st.executeQuery("select BLOBATTR from TESTBLOB where ID=1 for update"); if (rs.next()) { //得到java.sql.Blob对象后强制转换为oracle.sql.BLOB oracle.sql.BLOB blob = (oracle.sql.BLOB) rs.getBlob("BLOBATTR"); OutputStream outStream = blob.getBinaryOutputStream(); //data是传入的byte数组,定义:byte[] data outStream.write(data, 0, data.length); } outStream.flush(); outStream.close(); con.commit(); con.close(); (2)JNDI方式 //通过JNDI获得数据库连接 Context context = new InitialContext(); ds = (DataSource) context.lookup("ORA_JNDI"); Connection con = ds.getConnection(); con.setAutoCommit(false); Statement st = con.createStatement(); //插入一个空对象empty_blob() st.executeUpdate("insert into TESTBLOB (ID, NAME, BLOBATTR) values (1, "thename", empty_blob())"); //锁定数据行进行更新,注意“for update”语句 ResultSet rs = st.executeQuery("select BLOBATTR from TESTBLOB where ID=1 for update"); if (rs.next()) { //得到java.sql.Blob对象后强制转换为weblogic.jdbc.vendor.oracle.OracleThinBlob(不同的App Server对应的可能会不同) weblogic.jdbc.vendor.oracle.OracleThinBlob blob = (weblogic.jdbc.vendor.oracle.OracleThinBlob) rs.getBlob("BLOBATTR"); OutputStream outStream = blob.getBinaryOutputStream(); //data是传入的byte数组,定义:byte[] data outStream.write(data, 0, data.length); } outStream.flush(); outStream.close(); con.commit(); con.close(); 2、出库 //获得数据库连接 Connection con = ConnectionFactory.getConnection(); con.setAutoCommit(false); Statement st = con.createStatement(); //不需要“for update” ResultSet rs = st.executeQuery("select BLOBATTR from TESTBLOB where ID=1"); if (rs.next()) { java.sql.Blob blob = rs.getBlob("BLOBATTR"); InputStream inStream = blob.getBinaryStream(); //data是读出并需要返回的数据,类型是byte[] data = new byte[input.available()]; inStream.read(data); inStream.close(); <pre class="java" name="code">conn = this.getConnection(); conn.setAutoCommit(false); java.sql.Statement st = conn.createStatement(); rs= st.executeQuery(sql); BLOB inblob = null; if (rs.next()) { inblob = (BLOB) rs.getBlob("BLOBATTR"); } data=inblob.getBytes(1,(int)inblob.length());//这个就是数据 } inStream.close(); con.commit(); con.close(); 二、CLOB操作 1、入库 (1)JDBC方式 //通过JDBC获得数据库连接 Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:testdb", "test", "test"); con.setAutoCommit(false); Statement st = con.createStatement(); //插入一个空对象empty_clob() st.executeUpdate("insert into TESTCLOB (ID, NAME, CLOBATTR) values (1, "thename", empty_clob())"); //锁定数据行进行更新,注意“for update”语句 ResultSet rs = st.executeQuery("select CLOBATTR from TESTCLOB where ID=1 for update"); if (rs.next()) { //得到java.sql.Clob对象后强制转换为oracle.sql.CLOB oracle.sql.CLOB clob = (oracle.sql.CLOB) rs.getClob("CLOBATTR"); Writer outStream = clob.getCharacterOutputStream(); //data是传入的字符串,定义:String data char[] c = data.toCharArray(); outStream.write(c, 0, c.length); } outStream.flush(); outStream.close(); con.commit(); con.close(); (2)JNDI方式 //通过JNDI获得数据库连接 Context context = new InitialContext(); ds = (DataSource) context.lookup("ORA_JNDI"); Connection con = ds.getConnection(); con.setAutoCommit(false); Statement st = con.createStatement(); //插入一个空对象empty_clob() st.executeUpdate("insert into TESTCLOB (ID, NAME, CLOBATTR) values (1, "thename", empty_clob())"); //锁定数据行进行更新,注意“for update”语句 ResultSet rs = st.executeQuery("select CLOBATTR from TESTCLOB where ID=1 for update"); if (rs.next()) { //得到java.sql.Clob对象后强制转换为weblogic.jdbc.vendor.oracle.OracleThinClob(不同的App Server对应的可能会不同) weblogic.jdbc.vendor.oracle.OracleThinClob clob = (weblogic.jdbc.vendor.oracle.OracleThinClob) rs.getClob("CLOBATTR"); Writer outStream = clob.getCharacterOutputStream(); //data是传入的字符串,定义:String data char[] c = data.toCharArray(); outStream.write(c, 0, c.length); } outStream.flush(); outStream.close(); con.commit(); con.close(); 2、出库 //获得数据库连接 Connection con = ConnectionFactory.getConnection(); con.setAutoCommit(false); Statement st = con.createStatement(); //不需要“for update” ResultSet rs = st.executeQuery("select CLOBATTR from TESTCLOB where ID=1"); if (rs.next()) { java.sql.Clob clob = rs.getClob("CLOBATTR"); Reader inStream = clob.getCharacterStream(); char[] c = new char[(int) clob.length()]; inStream.read(c); //data是读出并需要返回的数据,类型是String data = new String(c); inStream.close(); } inStream.close(); con.commit(); con.close(); 需要注意的地方: 1、java.sql.Blob、oracle.sql.BLOB、weblogic.jdbc.vendor.oracle.OracleThinBlob几种类型的区别 2、java.sql.Clob、oracle.sql.CLOB、weblogic.jdbc.vendor.oracle.OracleThinClob几种类型的区别 公司项目中的用法(博客): 入库:先插一个oracle.sql.CLOB.empty_lob()进去,然后 String updateBaseSourceSql = "select content from mb_baseSource where id = ? for update"; conn.setAutoCommit(false); ps = conn.prepareStatement(updateBaseSourceSql); ps.setLong(1, result); ResultSet rs = ps.executeQuery(); oracle.sql.CLOB clob = null; if (rs.next()) { clob = (oracle.sql.CLOB) rs.getClob(1); } Writer wr = clob.getCharacterOutputStream(); wr.write(baseSource[4]); wr.flush(); wr.close(); rs.close(); ps.close(); conn.commit(); 出库: findBaseSourceSql = "select content from mb_baseSource where id = ?"; ps = conn.prepareStatement(findBaseSourceSql); ps.setLong(1, sourceID); rs = ps.executeQuery(); if (rs.next()) { CLOB clob = (oracle.sql.CLOB) rs.getClob(1); if (clob != null) { Reader is = clob.getCharacterStream(); BufferedReader br = new BufferedReader(is); String s = br.readLine(); while (s != null) { result[6] += s; s = br.readLine(); } } } rs.close(); ps.close(); conn.close();
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