jdbc读取数据库图片文件

package 读取大文件.read;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.sql.ResultSet;
import java.sql.Statement;

import org.junit.Test;

import 配置方式.dbUtils.Connection2;
/**
 * 读取数据库中的问件
 * @author lx
 *
 */

public class ReadBlob {
    @Test

    public void readBlob() throws Exception {

        // sql
        String sql = "select * from stud where id=77";
        // 读取不接受参数可以直接用statment

        Statement st = Connection2.GetCon().createStatement();

        // 执行查询
        ResultSet rs = st.executeQuery(sql);
        // 确定只有一行
        if (rs.next()) {
            int id = rs.getInt("id");
            // 获取图片
            InputStream in = rs.getBinaryStream("img");// 数据库字段
            // 声明out
            OutputStream out = new FileOutputStream("q:/b.jpg");

            byte[] b = new byte[1024];
            int len = 0;
            while ((len = in.read(b)) != -1) {
                out.write(b, 0, len);

            }
            out.close();
            // --------------------------
            // 显示文本
            InputStream in2 = rs.getAsciiStream("id");

            BufferedReader br = new BufferedReader(new InputStreamReader(in2));

            String line = null;
            while ((line = br.readLine()) != null) {
                System.err.println(line);

            }
            br.close();
            in2.close();

        }

    }

}