📄 upload2.htm

📁 java开发实例多个jsp开发实例
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    <td width="80%" valign="top" height="227">　
      <p align="center"><b><font color="#FF0000" size="3">用JSP编写文件上传<br>
      </font></b><br>
      <p>袁毅：2000-10-23&nbsp;
      <p><br>
  如果你曾用VB编写文件上传的组件的话，那么用JAVA编写文件上传的JAVABEAN十分容易。<br>
  下面的例子只是一个简版<br>
      package yuanyifileup;<br> 
      import java.io.*;<br> 
      import java.util.*;<br> 
      import javax.servlet.*;<br> 
      import javax.servlet.http.*;<br> 
      import javax.servlet.jsp.PageContext;<br> 
      <br> 
      public class yuanyifileup<br> 
      {<br> 
    private ServletRequest request;<br> 
    private ServletResponse response;<br> 
    private ServletConfig config;<br> 
    ServletInputStream DATA;<br> 
    int FormSize;<br> 
    File f1;<br> 
    FileOutputStream os;<br> 
    DataInputStream is;<br> 
    String filename;<br> 
    byte[] b;<br> 
    byte t;<br> 
    boolean flag=false;<br> 
    public yuanyifileup()<br> 
    { }<br> 
    public void initialize(ServletConfig config,HttpServletRequest request,HttpServletResponse response) throws IOException<br> 
    {<br> 
        this.request=request;<br> 
        this.response=response;<br> 
        this.config=config;<br> 
        DATA = request.getInputStream();<br> 
        FormSize=request.getContentLength();<br> 
    }<br> 
    public void initialize(PageContext pageContext) throws IOException<br> 
    {<br> 
        request=pageContext.getRequest();<br> 
        response=pageContext.getResponse();<br> 
        config=pageContext.getServletConfig();<br> 
        DATA = request.getInputStream();<br> 
        FormSize=request.getContentLength();<br> 
    }<br> 
    public boolean setFilename(String s)<br> 
    {<br> 
        try<br> 
        {<br> 
        File f1=new File(s);<br> 
        os=new FileOutputStream(f1);<br> 
        }<br> 
        catch(IOException e)<br> 
        {return(false);}<br> 
        return(true);<br> 
    }<br> 
    public void getByte()<br> 
    {<br> 
        int i=0;<br> 
        try<br> 
        {<br> 
        is=new DataInputStream(DATA);<br> 
        b=new byte[FormSize];<br> 
      <br> 
        while (true)<br> 
        {<br> 
            try<br> 
            {<br> 
                t=is.readByte();<br> 
                b[i]=t;<br> 
                i++;<br> 
            }<br> 
            catch(EOFException e)<br> 
            { break;}<br> 
        }<br> 
        is.close();}<br> 
        catch(IOException e)<br> 
        {}<br> 
       }<br> 
      <br> 
    public boolean save()<br> 
    {<br> 
        int i=0,start1=0,start2=0;<br> 
        String temp="";<br> 
        if (!flag)<br> 
        {<br> 
            getByte();<br> 
            flag=true;<br> 
        }<br> 
        try<br> 
        {<br> 
        temp=new String(b,"ISO8859_1");<br> 
        }<br> 
        catch(UnsupportedEncodingException e)<br> 
        {return(false);}<br> 
      <br> 
        start1=temp.indexOf("image/");<br> 
        temp=temp.substring(start1);<br> 
      <br> 
        start1=temp.indexOf("\r\n\r\n");<br> 
      <br> 
        temp=temp.substring(start1+4);<br> 
        start2=temp.indexOf(";\r\n");<br> 
        if (start2!=-1)<br> 
        {<br> 
            temp=temp.substring(0,start2);&nbsp;<br>
        }<br>
        try<br>
        {<br>
        byte[] img=temp.getBytes("ISO8859_1");<br> 
        for (i=0;i&lt;img.length;i++)<br> 
         {    os.write(img[i]);    }<br> 
         os.close();<br> 
         }<br> 
         catch(IOException e)<br> 
         {return(false);}<br> 
      <br> 
         return(true);<br> 
      <br> 
    }<br> 
      如果有不明白的发E-Mail:yymailbox@263.net.Bye&nbsp;<br>
      <br>
      } <br> 
      <br> 
        
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