在java 中处理oracle中的大对象

（CLOB和BLOB数据类型）：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.OutputStream;
import java.io.Writer;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import oracle.sql.BLOB;
import oracle.sql.CLOB;

public class Test ...{

    /** *//**
     * @param args
     */
    public static void main(String[] args) ...{
        // TODO Auto-generated method stub
        System.out.println("Process Start ...");

        testClob();
    }

    public static void testClob() ...{
        Connection con = null;
        PreparedStatement pst = null;
        ResultSet rs = null;

        String strsql = "truncate table test";
        String strsql1 = "insert into test values('test', empty_clob(), empty_blob())";
        String strsql2 = "update test set bigobject1 = ?, bigobject2 = ? where testid = ?";
        String strsql3 = "select * from test where testid = 'test' for update";
        String strLong = StringLong.strLong;

        System.out.println("strLong.length() : " + strLong.length());
//        File file = new File("E:/pic/2006_10_02/IMG_0087.JPG");
        File file = new File("D:/2007.wmv");

        con = ConnDB.getConnection66();

        try ...{
            con.setAutoCommit(false);

            pst = con.prepareStatement(strsql);
            pst.executeUpdate();

            pst = con.prepareStatement(strsql1);
            pst.executeUpdate();

            pst = con.prepareStatement(strsql3);
            rs = pst.executeQuery();

            while (rs.next()) ...{

                long stime = System.currentTimeMillis();

                BLOB bb = (BLOB) rs.getBlob(3);
                CLOB cb = (CLOB) rs.getClob(2);
                
                /** *//************************ CLOB Reader String *************************/                
                Writer wt = cb.getCharacterOutputStream();
                wt.write(strLong);
                wt.flush();
                wt.close();
                /** *//************************ CLOB Reader String *************************/    
                
                /** *//************************ CLOB Reader File *************************/                        
//                BufferedWriter bw = new BufferedWriter(cb.getCharacterOutputStream());
//                BufferedReader bfr = new BufferedReader(new FileReader("D:/test.txt"));
//                int read =0;
//                while((read = bfr.read()) != -1){
//                    bw.write(read);
//                }
//                bw.flush();
//                bw.close();
                /** *//************************ CLOB Reader File *************************/            

                
                /** *//************************ BLOB Reader File *************************/    
                OutputStream outstrm = bb.getBinaryOutputStream();
                FileInputStream inpstrm = new FileInputStream(file);
                byte[] buffer = new byte[inpstrm.available()];
                inpstrm.read(buffer);
                outstrm.write(buffer);
                outstrm.flush();
                inpstrm.close();
                outstrm.close();
                /** *//************************ BLOB Reader File *************************/    
                
                pst = con.prepareStatement(strsql2);
                pst.setClob(1, cb);  // Clob
                pst.setBlob(2, bb);  // Blob
                pst.setString(3, "test");
                pst.executeUpdate();

                long etime = System.currentTimeMillis();

                System.out.println("Execute Time : " + (etime - stime) / 1000.0);

            }
            con.commit();
            
            /** *//************************ Output CLOB String From DB *************************/                
            pst = con.prepareStatement("select * from test");
            rs = pst.executeQuery();            
            if (rs.next())...{
                CLOB clb = (CLOB) rs.getClob(2);
                BufferedReader br = new BufferedReader(clb.getCharacterStream());
                String s = br.readLine();
                while(s != null)...{
                    System.out.println(s);    
                    s = br.readLine();
                }    
                br.close();
            }
            /** *//************************ Output CLOB String From DB *************************/    
            
            System.out.println("Process End !");
            
        } catch (SQLException e) ...{
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (FileNotFoundException e1) ...{
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (Exception ex) ...{
            ex.printStackTrace();
        } finally ...{
            try ...{
                pst.close();
                con.close();
            } catch (SQLException e) ...{
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}