struts2 从数据库中读取图片流文件，并显示到jsp

弹出保存路径：

js:

window.open(str,'blank_','scrollbars=no,resizable=no,width=10,height=10,menubar=no');

-------------------------

struts中:

//图片

response.setContentType("image/jpg"); 
      response.setHeader("Content-disposition",  
                        "attachment;filename=\"" + mail.getFileName() + "\";");  
      BufferedImage image = null;
         image=ImageIO.read(in);
         ServletOutputStream sos = response.getOutputStream();
         JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
         encoder.encode(image);
         in.close();



//excel

response.setContentType("application/vnd.ms-excel"); 
      response.setHeader("Content-disposition",  
                        "attachment;filename=\"" + mail.getFileName() + "\";");  
      OutputStream out = response.getOutputStream();  
      HSSFWorkbook wb =  new HSSFWorkbook();
         HSSFSheet s = wb.createSheet();
         int len = 0;
         byte[] buf = new byte[1];
      while((len = in.read(buf)) != -1)
      {
       out.write(buf, 0, len);
      }
         wb.write(out);
         out.close();
         return null;



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将图片流从数控库取出，显示到JSP

//jpg

HttpServletResponse response = (HttpServletResponse)
    ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_RESPONSE);

  byte[] buf = new byte[1];
            response.setContentType("image/jpeg");
            OutputStream os=response.getOutputStream();
            int len = 0;
          while((len = in.read(buf)) != -1)
          {
             os.write(buf, 0, len);
            }
            os.close();
            in.close();
            return null;



---jsp

<s:property value="response.getOutputStream()"/>



//text file



BufferedReader reader = new BufferedReader(new InputStreamReader(in));
          StringBuilder sb = new StringBuilder();   
          String line = null;   
                  
                   while ((line = reader.readLine()) != null)
                   {   
                    sb.append(line + "\n");   
                   }   
                   mail.setMessageBody(sb.toString());



//jsp

<s:property value="mailVO.messageBody"/>





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public class Test1
{

public static void main(String[] args)
{
//  attachmentEncryption();
  attachmentDecryption();
}

public static void attachmentEncryption()
{
  InputStream in = null;
  byte[] buf = new byte[100];
  int len = 0;
  BasicBinaryEncryptor encryptor = new BasicBinaryEncryptor();
  try
  {
   in = new FileInputStream(new File("D:\\file.txt"));
   encryptor.setPassword("test");
   byte[] myEncryptedBinary = encryptor.encrypt(InputStreamToByte(in));
   InputStream sbs = new ByteArrayInputStream(myEncryptedBinary);
  
   FileOutputStream os = new FileOutputStream(new File("D:\\temp.txt"));
   while((len = sbs.read(buf)) != -1)
   {
    os.write(buf, 0, len);
   }
   in.close();
   sbs.close();
   os.close();
  
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }
}

public static void attachmentDecryption()
{
  InputStream in = null;
  FileOutputStream os = null;
  byte[] buf = new byte[100];
  int len = 0;
  BasicBinaryEncryptor encryptor = new BasicBinaryEncryptor();
  try
  {
   in = new FileInputStream(new File("D:\\temp.txt"));
   encryptor.setPassword("test");
   byte[] binary = encryptor.decrypt(InputStreamToByte(in));
   InputStream sbs = new ByteArrayInputStream(binary);
   os = new FileOutputStream(new File("D:\\result.txt"));
   while((len = sbs.read(buf)) != -1)
   {
    os.write(buf, 0, len);
   }
   in.close();
   sbs.close();
   os.close();
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }
}

public static byte[] InputStreamToByte(InputStream iStrm) throws IOException
{
     ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
     int ch;
     while ((ch = iStrm.read()) != -1)
     {
        bytestream.write(ch);
     }
     byte imgdata[]=bytestream.toByteArray();
     bytestream.close();
     return imgdata;
}
public static void textEncryption()
{
  BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
  textEncryptor.setPassword("test");
  String myEncryptedText = textEncryptor.encrypt("this's a encrypted mail");
  System.out.println("encrypted text: "+myEncryptedText);
  String plainText = textEncryptor.decrypt(myEncryptedText);
  System.out.println("plain text: "+plainText);
}
}