以二进制流的方式存取图像

以二进制流的方式存取图像

imageinfo.sql

  CREATE   TABLE   [dbo].[emp]   (   
  [name]   [varchar]   ( 50 )   COLLATE   Chinese_PRC_CI_AS   NULL   ,   
  [pay]   [money]   NULL   ,   
  [img]   [image]   NULL     
  )   ON   [PRIMARY]   TEXTIMAGE_ON   [PRIMARY]  

test.html

   < HTML >      
   < HEAD >      
   < TITLE > Image   File    </ TITLE >      
   < meta   http - equiv = " Content-Type "    content = " text/html;   charset=gb2312 " >      
   </ HEAD >
   < h1 > 图片上传 </ h1 >      
   < FORM   METHOD = POST   ACTION = " testimage.jsp " >      
   < INPUT   TYPE = " text "    NAME = " content " >< BR >      
   < INPUT   TYPE = " file "    NAME = " image " >< BR >      
   < INPUT   TYPE = " submit " ></ FORM >      
   < BODY >      
   </ BODY >      
   </ HTML >

testimage.jsp

   <% @   page   contentType = " text/html;charset=gb2312 " %>      
   <% @   page    import = " java.sql.* "     %>      
   <% @   page    import = " java.util.* " %>      
   <% @   page    import = " java.text.* " %>      
   <% @   page    import = " java.io.* " %>      
   < html >      
   < body >      
   <%    
  Class.forName( " com.microsoft.jdbc.sqlserver.SQLServerDriver " );   
  String   url    =     " jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=imageinfo " ;   
  Connection   conn    =    DriverManager.getConnection(url, " sa " , " sa " );   
  System.out.println( " diver   is   ok " );   
    
  String   content = request.getParameter( " content " );     
  String   filename = request.getParameter( " image " );     
  FileInputStream   img = new    FileInputStream(filename);     
  String   sql = " insert   into   emp(name,pay,img)   values('lyd',12,?) " ;     
  PreparedStatement   pstmt = conn.prepareStatement(sql);     
  pstmt.setBinaryStream( 1 ,img,img.available());     
  pstmt.execute();     
  out.println( " Success,You   Have   Insert   an   Image   Successfully " );
  pstmt.close();
  conn.close();
  img.close();     
   %>    

show.jsp

  <% @   page   contentType = " text/html;charset=gb2312 " %>      
   <% @   page    import = " java.sql.* "     %>      
   <% @   page    import = " java.util.* " %>      
   <% @   page    import = " java.text.* " %>      
   <% @   page    import = " java.io.* " %>      
   < html >      
   < body >      
   <%    
  Class.forName( " com.microsoft.jdbc.sqlserver.SQLServerDriver " );   
  String   url    =     " jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=imageinfo " ;   
  Connection   conn    =    DriverManager.getConnection(url, " sa " , " sa " );   
  System.out.println( " diver   is   ok " );   
  String   sql    =     " select   img   from   emp    " ;     
  Statement   stmt = null ;     
  ResultSet   rs = null ;     
   try {     
  stmt = conn.createStatement();     
  rs = stmt.executeQuery(sql);     
  } catch (SQLException   e)   
  {   
  out.println( " db   connection   error! " );   
  }     
   try {     
       while (rs.next()){   
           // rs.setContentType("image/jpeg");     
          ServletOutputStream   sout    =    response.getOutputStream();     
          InputStream   in    =    rs.getBinaryStream( " img " );     
           byte    b[]    =     new     byte [ 0x7a120 ];     
               for ( int    i    =    in.read(b);   i    !=     - 1 ;)     
              {     
                  sout.write(b);     
                  in.read(b);     
              }     
          sout.flush();     
          sout.close();  
          in.close();   
     }     
  }     
   catch (Exception   e){System.out.println(e);}
   finally {
      rs.close();
      stmt.close();
      conn.close();
      
  }     
   %>      
   </ body >      
   </ html >

以下方法为输出到磁盘上：

package  org.hank.test;

import  java.io. * ;
import  java.sql.Connection;
import  java.sql.DriverManager;
import  java.sql.ResultSet;
import  java.sql.Statement;

public   class  ImageTest {

     /**
     *  @param  args
      */
     public   static   void  main(String[] args) {
          String   driver    =     " com.microsoft.jdbc.sqlserver.SQLServerDriver " ;   
          String   url    =     " jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=imageinfo " ;   
          String   user    =     " sa " ;   
          String   password    =     " sa " ;   
            
          InputStream   in    =     null ;   
           try      
          {   
              FileOutputStream   fos = new    FileOutputStream( " c:\\123.jpg " );   
              Class.forName(driver);   
              Connection   conn    =    DriverManager.getConnection(url,   user,   password);   
              Statement   stmt    =    conn.createStatement();   
              String   sql    =     " select   img   from   emp " ;   
              ResultSet   rs    =    stmt.executeQuery(sql); 
              System.out.println(rs.toString());
               if    (rs.next())   
              {   
              in    =    rs.getBinaryStream( " img " );  
               int    len;   
               byte []   buf    =     new     byte [ 1024 ];   
                     while    ( ( len    =    in.read(buf,    0 ,    1024 ) )    !=     - 1  )   
                  {   
                      fos.write(buf,    0 ,   len);   
                  }   
              }   

          }   
           catch    (Exception   exc){}   
            
    }  
}