java以Blob形式存储，读取图片并在jsp页面显示图片流

      废话少说代码伺候：

封装好的ImageUtil类：目的读取本地的图片文件并存入数据库，然后读出数据库中以Blob形式存储的图片保存到指定目录。

 

  
   
   
   
   

   
   
   
   
   
 
   
 
   
    
    
    
     1 
   
   
   
   
   
 
   
 
   
    
    
    
    package org.blog.util;

   
   
   
   
   
 
   
 
   
    
    
    
     2 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.File;

   
   
   
   
   
 
   
 
   
    
    
    
     3 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.FileInputStream;

   
   
   
   
   
 
   
 
   
    
    
    
     4 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.FileNotFoundException;

   
   
   
   
   
 
   
 
   
    
    
    
     5 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.FileOutputStream;

   
   
   
   
   
 
   
 
   
    
    
    
     6 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.IOException;

   
   
   
   
   
 
   
 
   
    
    
    
     7 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    public
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    class
   
   
   
   
   
 
   
 
   
    
    
    
     ImageUtil {

   
   
   
   
   
 
   
 
   
    
    
    
     8 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    private
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    static
   
   
   
   
   
 
   
 
   
    
    
    
     File file 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    null
   
   
   
   
   
 
   
 
   
    
    
    
    ;

   
   
   
   
   
 
   
 
   
    
    
    
     9 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    /*
   
   
   
   
   
 
   
 
   
    
    
    
    *

   
   
   
   
   
 
   
 
   
    
    
    
    10 
   
   
   
   
   
 
   
 
   
    
    
    
     * 读取图像的二进制流

   
   
   
   
   
 
   
 
   
    
    
    
    11 
   
   
   
   
   
 
   
 
   
    
    
    
     * 

   
   
   
   
   
 
   
 
   
    
    
    
    12 
   
   
   
   
   
 
   
 
   
    
    
    
     * @param infile

   
   
   
   
   
 
   
 
   
    
    
    
    13 
   
   
   
   
   
 
   
 
   
    
    
    
     * @return

   
   
   
   
   
 
   
 
   
    
    
    
    14 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    */
   
   
   
   
   
 
   
 
   
    
    
    
    

   
   
   
   
   
 
   
 
   
    
    
    
    15 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    public
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    static
   
   
   
   
   
 
   
 
   
    
    
    
     FileInputStream getByteImage(String infile) {

   
   
   
   
   
 
   
 
   
    
    
    
    16 
   
   
   
   
   
 
   
 
   
    
    
    
     FileInputStream inputImage 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    null
   
   
   
   
   
 
   
 
   
    
    
    
    ;

   
   
   
   
   
 
   
 
   
    
    
    
    17 
   
   
   
   
   
 
   
 
   
    
    
    
     file 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    new
   
   
   
   
   
 
   
 
   
    
    
    
     File(infile);

   
   
   
   
   
 
   
 
   
    
    
    
    18 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    try
   
   
   
   
   
 
   
 
   
    
    
    
     {

   
   
   
   
   
 
   
 
   
    
    
    
    19 
   
   
   
   
   
 
   
 
   
    
    
    
     inputImage 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    new
   
   
   
   
   
 
   
 
   
    
    
    
     FileInputStream(file);

   
   
   
   
   
 
   
 
   
    
    
    
    20 
   
   
   
   
   
 
   
 
   
    
    
    
     } 
   
   
   
   
   
 
   
 
   
    
    
    
    catch
   
   
   
   
   
 
   
 
   
    
    
    
     (FileNotFoundException e) {

   
   
   
   
   
 
   
 
   
    
    
    
    21 
   
   
   
   
   
 
   
 
   
    
    
    
     e.printStackTrace();

   
   
   
   
   
 
   
 
   
    
    
    
    22 
   
   
   
   
   
 
   
 
   
    
    
    
     }

   
   
   
   
   
 
   
 
   
    
    
    
    23 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    return
   
   
   
   
   
 
   
 
   
    
    
    
     inputImage;

   
   
   
   
   
 
   
 
   
    
    
    
    24 
   
   
   
   
   
 
   
 
   
    
    
    
     }

   
   
   
   
   
 
   
 
   
    
    
    
    25 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    /*
   
   
   
   
   
 
   
 
   
    
    
    
    *

   
   
   
   
   
 
   
 
   
    
    
    
    26 
   
   
   
   
   
 
   
 
   
    
    
    
     * 输出图片

   
   
   
   
   
 
   
 
   
    
    
    
    27 
   
   
   
   
   
 
   
 
   
    
    
    
     * @param inputStream

   
   
   
   
   
 
   
 
   
    
    
    
    28 
   
   
   
   
   
 
   
 
   
    
    
    
     * @param path

   
   
   
   
   
 
   
 
   
    
    
    
    29 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    */
   
   
   
   
   
 
   
 
   
    
    
    
    

   
   
   
   
   
 
   
 
   
    
    
    
    30 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    public
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    static
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    void
   
   
   
   
   
 
   
 
   
    
    
    
     readBlob(FileInputStream inputStream, String path) {

   
   
   
   
   
 
   
 
   
    
    
    
    31 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    try
   
   
   
   
   
 
   
 
   
    
    
    
     {

   
   
   
   
   
 
   
 
   
    
    
    
    32 
   
   
   
   
   
 
   
 
   
    
    
    
     FileOutputStream fileOutputStream 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    new
   
   
   
   
   
 
   
 
   
    
    
    
     FileOutputStream(path);

   
   
   
   
   
 
   
 
   
    
    
    
    33 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    byte
   
   
   
   
   
 
   
 
   
    
    
    
    [] buf 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    new
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    byte
   
   
   
   
   
 
   
 
   
    
    
    
    [
   
   
   
   
   
 
   
 
   
    
    
    
    1024
   
   
   
   
   
 
   
 
   
    
    
    
    ];

   
   
   
   
   
 
   
 
   
    
    
    
    34 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    int
   
   
   
   
   
 
   
 
   
    
    
    
     len 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    0
   
   
   
   
   
 
   
 
   
    
    
    
    ;

   
   
   
   
   
 
   
 
   
    
    
    
    35 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    while
   
   
   
   
   
 
   
 
   
    
    
    
     ((len 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     inputStream.read(buf)) 
   
   
   
   
   
 
   
 
   
    
    
    
    !=
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    -
   
   
   
   
   
 
   
 
   
    
    
    
    1
   
   
   
   
   
 
   
 
   
    
    
    
    ) {

   
   
   
   
   
 
   
 
   
    
    
    
    36 
   
   
   
   
   
 
   
 
   
    
    
    
     fileOutputStream.write(buf, 
   
   
   
   
   
 
   
 
   
    
    
    
    0
   
   
   
   
   
 
   
 
   
    
    
    
    , len);
   
   
   
   
   
 
   
 
   
    
    
    
    //
   
   
   
   
   
 
   
 
   
    
    
    
     写
   
   
   
   
   
 
   
 
   
    
    
    
    

   
   
   
   
   
 
   
 
   
    
    
    
    37 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
     }

   
   
   
   
   
 
   
 
   
    
    
    
    38 
   
   
   
   
   
 
   
 
   
    
    
    
     inputStream.close();

   
   
   
   
   
 
   
 
   
    
    
    
    39 
   
   
   
   
   
 
   
 
   
    
    
    
     fileOutputStream.close();

   
   
   
   
   
 
   
 
   
    
    
    
    40 
   
   
   
   
   
 
   
 
   
    
    
    
     } 
   
   
   
   
   
 
   
 
   
    
    
    
    catch
   
   
   
   
   
 
   
 
   
    
    
    
     (FileNotFoundException e) {

   
   
   
   
   
 
   
 
   
    
    
    
    41 
   
   
   
   
   
 
   
 
   
    
    
    
     e.printStackTrace();

   
   
   
   
   
 
   
 
   
    
    
    
    42 
   
   
   
   
   
 
   
 
   
    
    
    
     } 
   
   
   
   
   
 
   
 
   
    
    
    
    catch
   
   
   
   
   
 
   
 
   
    
    
    
     (IOException e) {

   
   
   
   
   
 
   
 
   
    
    
    
    43 
   
   
   
   
   
 
   
 
   
    
    
    
     e.printStackTrace();

   
   
   
   
   
 
   
 
   
    
    
    
    44 
   
   
   
   
   
 
   
 
   
    
    
    
     }

   
   
   
   
   
 
   
 
   
    
    
    
    45 
   
   
   
   
   
 
   
 
   
    
    
    
     }

   
   
   
   
   
 
   
 
   
    
    
    
    46 
   
   
   
   
   
 
   
 
   
    
    
    
    }
  
  
  
  
  

  

  
   
   
   
   

从数据库中读出二进制流显示到jsp页面：

servlet源码：

 

  
   
   
   
   

   
   
   
   
   
 
   
 
   
    
    
    
     1 
   
   
   
   
   
 
   
 
   
    
    
    
    package servlet;

   
   
   
   
   
 
   
 
   
    
    
    
     2 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.ByteArrayInputStream;

   
   
   
   
   
 
   
 
   
    
    
    
     3 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.FileInputStream;

   
   
   
   
   
 
   
 
   
    
    
    
     4 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.IOException;

   
   
   
   
   
 
   
 
   
    
    
    
     5 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.InputStream;

   
   
   
   
   
 
   
 
   
    
    
    
     6 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.OutputStream;

   
   
   
   
   
 
   
 
   
    
    
    
     7 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.io.PrintWriter;

   
   
   
   
   
 
   
 
   
    
    
    
     8 
   
   
   
   
   
 
   
 
   
    
    
    
    import java.sql.Blob;

   
   
   
   
   
 
   
 
   
    
    
    
     9 
   
   
   
   
   
 
   
 
   
    
    
    
    import javax.servlet.ServletException;

   
   
   
   
   
 
   
 
   
    
    
    
    10 
   
   
   
   
   
 
   
 
   
    
    
    
    import javax.servlet.ServletOutputStream;

   
   
   
   
   
 
   
 
   
    
    
    
    11 
   
   
   
   
   
 
   
 
   
    
    
    
    import javax.servlet.http.HttpServlet;

   
   
   
   
   
 
   
 
   
    
    
    
    12 
   
   
   
   
   
 
   
 
   
    
    
    
    import javax.servlet.http.HttpServletRequest;

   
   
   
   
   
 
   
 
   
    
    
    
    13 
   
   
   
   
   
 
   
 
   
    
    
    
    import javax.servlet.http.HttpServletResponse;

   
   
   
   
   
 
   
 
   
    
    
    
    14 
   
   
   
   
   
 
   
 
   
    
    
    
    import org.blog.util.ImageUtil;

   
   
   
   
   
 
   
 
   
    
    
    
    15 
   
   
   
   
   
 
   
 
   
    
    
    
    import org.hibernate.Hibernate;

   
   
   
   
   
 
   
 
   
    
    
    
    16 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    public
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    class
   
   
   
   
   
 
   
 
   
    
    
    
     Image extends HttpServlet {

   
   
   
   
   
 
   
 
   
    
    
    
    17 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    private
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    static
   
   
   
   
   
 
   
 
   
    
    
    
     final 
   
   
   
   
   
 
   
 
   
    
    
    
    long
   
   
   
   
   
 
   
 
   
    
    
    
     serialVersionUID 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    1L
   
   
   
   
   
 
   
 
   
    
    
    
    ;

   
   
   
   
   
 
   
 
   
    
    
    
    18 
   
   
   
   
   
 
   
 
   
    
    
    
     @Override

   
   
   
   
   
 
   
 
   
    
    
    
    19 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    protected
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    void
   
   
   
   
   
 
   
 
   
    
    
    
     doGet(HttpServletRequest req, HttpServletResponse resp)

   
   
   
   
   
 
   
 
   
    
    
    
    20 
   
   
   
   
   
 
   
 
   
    
    
    
     throws ServletException, IOException {

   
   
   
   
   
 
   
 
   
    
    
    
    21 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    this
   
   
   
   
   
 
   
 
   
    
    
    
    .doPost(req, resp);

   
   
   
   
   
 
   
 
   
    
    
    
    22 
   
   
   
   
   
 
   
 
   
    
    
    
     }

   
   
   
   
   
 
   
 
   
    
    
    
    23 
   
   
   
   
   
 
   
 
   
    
    
    
     @Override

   
   
   
   
   
 
   
 
   
    
    
    
    24 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    protected
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    void
   
   
   
   
   
 
   
 
   
    
    
    
     doPost(HttpServletRequest req, HttpServletResponse resp)

   
   
   
   
   
 
   
 
   
    
    
    
    25 
   
   
   
   
   
 
   
 
   
    
    
    
     throws ServletException, IOException {

   
   
   
   
   
 
   
 
   
    
    
    
    26 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    try
   
   
   
   
   
 
   
 
   
    
    
    
     {

   
   
   
   
   
 
   
 
   
    
    
    
    27 
   
   
   
   
   
 
   
 
   
    
    
    
     FileInputStream 
   
   
   
   
   
 
   
 
   
    
    
    
    in
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     ImageUtil.getByteImage(
   
   
   
   
   
 
   
 
   
    
    
    
    "
   
   
   
   
   
 
   
 
   
    
    
    
    D:\\me.jpg
   
   
   
   
   
 
   
 
   
    
    
    
    "
   
   
   
   
   
 
   
 
   
    
    
    
    );

   
   
   
   
   
 
   
 
   
    
    
    
    28 
   
   
   
   
   
 
   
 
   
    
    
    
     Blob blob 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     Hibernate.createBlob(
   
   
   
   
   
 
   
 
   
    
    
    
    in
   
   
   
   
   
 
   
 
   
    
    
    
    );

   
   
   
   
   
 
   
 
   
    
    
    
    29 
   
   
   
   
   
 
   
 
   
    
    
    
     InputStream inputStream 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     blob.getBinaryStream();
   
   
   
   
   
 
   
 
   
    
    
    
    //
   
   
   
   
   
 
   
 
   
    
    
    
     IO流
   
   
   
   
   
 
   
 
   
    
    
    
    

   
   
   
   
   
 
   
 
   
    
    
    
    30 
   
   
   
   
   
 
   
 
   
    
    
    
    
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    int
   
   
   
   
   
 
   
 
   
    
    
    
     length 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     (
   
   
   
   
   
 
   
 
   
    
    
    
    int
   
   
   
   
   
 
   
 
   
    
    
    
    ) blob.length();

   
   
   
   
   
 
   
 
   
    
    
    
    31 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    byte
   
   
   
   
   
 
   
 
   
    
    
    
    [] b 
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    new
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    byte
   
   
   
   
   
 
   
 
   
    
    
    
    [length];

   
   
   
   
   
 
   
 
   
    
    
    
    32 
   
   
   
   
   
 
   
 
   
    
    
    
     inputStream.read(b, 
   
   
   
   
   
 
   
 
   
    
    
    
    0
   
   
   
   
   
 
   
 
   
    
    
    
    , length);

   
   
   
   
   
 
   
 
   
    
    
    
    33 
   
   
   
   
   
 
   
 
   
    
    
    
     PrintWriter 
   
   
   
   
   
 
   
 
   
    
    
    
    out
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     resp.getWriter();

   
   
   
   
   
 
   
 
   
    
    
    
    34 
   
   
   
   
   
 
   
 
   
    
    
    
     InputStream 
   
   
   
   
   
 
   
 
   
    
    
    
    is
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    =
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
    new
   
   
   
   
   
 
   
 
   
    
    
    
     ByteArrayInputStream(b);

   
   
   
   
   
 
   
 
   
    
    
    
    35 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
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    24 
   
   
   
   
   
 
   
 
   
    
    
    
     
   
   
   
   
   
 
   
 
   
    
    
    
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