multipartfilter.java

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                            if(b>=0&&b<byteBoundary.length&&c==byteBoundary[b])
                                b++;
                            else
                            {
                                // this is not a boundary
                                if(cr)
                                    out.write(13);
                                if(lf)
                                    out.write(10);
                                cr=lf=false;
                                if(b>0)
                                    out.write(byteBoundary,0,b);
                                b=-1;
                                out.write(c);
                            }
                        }
                        // check partial boundary
                        if((b>0&&b<byteBoundary.length-2)||(b==byteBoundary.length-1))
                        {
                            if(cr)
                                out.write(13);
                            if(lf)
                                out.write(10);
                            cr=lf=false;
                            out.write(byteBoundary,0,b);
                            b=-1;
                        }
                        // boundary match
                        if(b>0||c==-1)
                        {
                            if(b==byteBoundary.length)
                                lastPart=true;
                            if(state==10)
                                state=-2;
                            break;
                        }
                        // handle CR LF
                        if(cr)
                            out.write(13);
                        if(lf)
                            out.write(10);
                        cr=(c==13);
                        lf=(c==10||state==10);
                        if(state==10)
                            state=-2;
                    }
                }
                finally
                {
                    out.close();
                }
                
                if (file==null)
                {
                    bytes = ((ByteArrayOutputStream)out).toByteArray();
                    params.add(name,bytes);
                }
            }
        
            // handle request
            chain.doFilter(new Wrapper(srequest,params),response);
        }
        finally
        {
            deleteFiles(request);
        }
    }

    private void deleteFiles(ServletRequest request)
    {
        ArrayList files = (ArrayList)request.getAttribute(FILES);
        if (files!=null)
        {
            Iterator iter = files.iterator();
            while (iter.hasNext())
            {
                File file=(File)iter.next();
                try
                {
                    file.delete();
                }
                catch(Exception e)
                {
                    _context.log("failed to delete "+file,e);
                }
            }
        }
    }
    /* ------------------------------------------------------------ */
    private String value(String nameEqualsValue)
    {
        String value=nameEqualsValue.substring(nameEqualsValue.indexOf('=')+1).trim();
        int i=value.indexOf(';');
        if(i>0)
            value=value.substring(0,i);
        if(value.startsWith("\""))
        {
            value=value.substring(1,value.indexOf('"',1));
        }
        else
        {
            i=value.indexOf(' ');
            if(i>0)
                value=value.substring(0,i);
        }
        return value;
    }

    /* ------------------------------------------------------------------------------- */
    /**
     * @see javax.servlet.Filter#destroy()
     */
    public void destroy()
    {
    }
    
    private static class Wrapper extends HttpServletRequestWrapper
    {
        String encoding="UTF-8";
        MultiMap map;
        
        /* ------------------------------------------------------------------------------- */
        /** Constructor.
         * @param request
         */
        public Wrapper(HttpServletRequest request, MultiMap map)
        {
            super(request);
            this.map=map;
        }
        
        /* ------------------------------------------------------------------------------- */
        /**
         * @see javax.servlet.ServletRequest#getContentLength()
         */
        public int getContentLength()
        {
            return 0;
        }
        
        /* ------------------------------------------------------------------------------- */
        /**
         * @see javax.servlet.ServletRequest#getParameter(java.lang.String)
         */
        public String getParameter(String name)
        {
            Object o=map.get(name);
            if (o instanceof byte[])
            {
                try
                {
                    String s=new String((byte[])o,encoding);
                    return s;
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
            }
            else if (o instanceof String)
                return (String)o;
            else if (o instanceof String[])
            {
                String[] s = (String[])o;
                return s.length>0 ? s[0] : null;
            }
            return null;
        }
        
        /* ------------------------------------------------------------------------------- */
        /**
         * @see javax.servlet.ServletRequest#getParameterMap()
         */
        public Map getParameterMap()
        {
            return map;
        }
        
        /* ------------------------------------------------------------------------------- */
        /**
         * @see javax.servlet.ServletRequest#getParameterNames()
         */
        public Enumeration getParameterNames()
        {
            return Collections.enumeration(map.keySet());
        }
        
        /* ------------------------------------------------------------------------------- */
        /**
         * @see javax.servlet.ServletRequest#getParameterValues(java.lang.String)
         */
        public String[] getParameterValues(String name)
        {
            List l=map.getValues(name);
            if (l==null || l.size()==0)
                return new String[0];
            String[] v = new String[l.size()];
            for (int i=0;i<l.size();i++)
            {
                Object o=l.get(i);
                if (o instanceof byte[])
                {
                    try
                    {
                        v[i]=new String((byte[])o,encoding);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                    }
                }
                else if (o instanceof String)
                    v[i]=(String)o;
            }
            return v;
        }
        
        /* ------------------------------------------------------------------------------- */
        /**
         * @see javax.servlet.ServletRequest#setCharacterEncoding(java.lang.String)
         */
        public void setCharacterEncoding(String enc) 
            throws UnsupportedEncodingException
        {
            encoding=enc;
        }
    }
}