用jdbc访问大段文本数据

 package it.cast.jdbc;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.Reader;
 import java.io.Writer;
 import java.sql.Clob;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 public class ClobTest {

     public static void main(String[] args) throws IOException {
         read();
     }

     static void create() throws IOException {
         Connection conn = null;
         PreparedStatement ps = null;
         ResultSet rs = null;

         try {
             // 建立连接
             conn = jdbcUtils.getConnection();

             // 创建语句
             String sql = "insert into clob_test(big_text) values (?)";

             ps = conn.prepareStatement(sql);

             File file = new File("src/it/cast/jdbc/Base.java");
             Reader reader = new BufferedReader(new FileReader(file));

             ps.setCharacterStream(1, reader, (int) file.length());

             // 执行语句
             int i = ps.executeUpdate();
             reader.close();

             System.out.println(i);

         } catch (SQLException e) {

             e.printStackTrace();
         } finally {
             jdbcUtils.free(rs, ps, conn);
         }
     }

     static void read() throws IOException {
         Connection conn = null;
         Statement st = null;
         ResultSet rs = null;

         try {

             // 建立连接
             conn = jdbcUtils.getConnection();

             // 创建语句
             st = conn.createStatement();

             String sql = "select big_text from clob_test";

             // 执行语句
             rs = st.executeQuery(sql);

             while (rs.next()) {
                 Clob clob = rs.getClob(1);
                 Reader reader = clob.getCharacterStream();
                 File file = new File("jdbcUtils_bak.java");
                 Writer writer = new BufferedWriter(new FileWriter(file));
                 char[] buff = new char[1024];

                 for (int i = 0; (i = reader.read(buff)) > 0;) {
                     writer.write(buff, 0, i);
                 }

                 writer.close();
                 reader.close();
             }

         } catch (SQLException e) {
             e.printStackTrace();
         } finally {
             jdbcUtils.free(rs, st, conn);
         }
     }

 }

ClobTest