Revision 943
Added by Jing Tao almost 23 years ago
src/edu/ucsb/nceas/metacat/MetaCatServlet.java | ||
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* <p>Valid parameters are:<br> |
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* action=query -- query the values of all elements and attributes |
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* and return a result set of nodes<br> |
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* action=squery -- structured query (see pathquery.dtd)<br> |
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* action=squery -- structured query (see pathquery.dtd)<br> |
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* action= -- export a zip format for data packadge<br> |
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* action=read -- read any metadata/data file from Metacat and from Internet<br> |
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* action=insert -- insert an XML document into the database store<br> |
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* action=update -- update an XML document that is in the database store<br> |
... | ... | |
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if (ctype != null && ctype.startsWith("multipart/form-data")) { |
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handleMultipartForm(request, response); |
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} else { |
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// This probably means the data is "application/x-www-url-encoded", we hope :-) |
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|
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|
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String name = null; |
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String[] value = null; |
... | ... | |
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handleQuery(response.getWriter(),params,response,username,groupnames); |
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} else if(action.equals("squery")) { |
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if(params.containsKey("query")) { |
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handleSQuery(response.getWriter(),params,response,username,groupnames);
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handleSQuery(response.getWriter(),params,response,username,groupnames); |
|
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} else { |
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PrintWriter out = response.getWriter(); |
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out.println("Illegal action squery without \"query\" parameter"); |
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} |
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} else if (action.equals("export")) { |
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//username and groupname have to continue using though they are |
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//not standard |
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handleExportAction(params, response, username, groupnames); |
|
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} else if (action.equals("read")) { |
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handleReadAction(params, response, username, groupnames); |
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} else if (action.equals("insert") || action.equals("update")) { |
... | ... | |
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} |
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// END OF SQUERY & QUERY SECTION |
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//Exoport section |
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/** |
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* Handle the "export" request of data package from Metacat in zip format |
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* @param params the Hashtable of HTTP request parameters |
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* @param response the HTTP response object linked to the client |
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* @param user the username sent the request |
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* @param groups the user's groupnames |
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*/ |
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private void handleExportAction(Hashtable params, |
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HttpServletResponse response, String user, String[] groups) |
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{ |
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ServletOutputStream out = null; |
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ZipOutputStream zOut = null; |
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DocumentImpl docImpls=null; |
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DBQuery queryObj=null; |
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Connection conn = null; |
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String[] docs = new String[10]; |
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String docId = ""; |
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try |
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{ |
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// read the params |
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if (params.containsKey("docid")) { |
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docs = (String[])params.get("docid"); |
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} |
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|
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//get the connection to database |
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conn = util.getConnection(); |
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queryObj = new DBQuery(conn, saxparser);//"saxparser" have to use though |
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//it is not standard |
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docId=docs[0]; |
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out = response.getOutputStream(); |
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response.setContentType("application/zip"); //MIME type |
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zOut = new ZipOutputStream(out); |
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zOut =queryObj.getZippedPackage(docId, out, user, groups); |
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zOut.finish(); //terminate the zip file |
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zOut.close(); //close the zip stream |
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} |
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catch (Exception e) |
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{ |
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try |
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{ |
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response.setContentType("text/xml"); //MIME type |
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if (out != null) |
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{ |
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PrintWriter pw = new PrintWriter(out); |
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pw.println("<?xml version=\"1.0\"?>"); |
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pw.println("<error>"); |
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pw.println(e.getMessage()); |
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pw.println("</error>"); |
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pw.close(); |
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} |
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if ( zOut != null ) |
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{ |
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zOut.close(); |
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} |
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} |
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catch (IOException ioe) |
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{ |
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util.debugMessage("Problem with the servlet output " + |
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"in MetacatServlet.handleReadAction: " + |
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ioe.getMessage()); |
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} |
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util.debugMessage("Error in MetacatServlet.handleReadAction: " + |
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e.getMessage()); |
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}//catch |
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}//handleExportAction |
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|
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// READ SECTION |
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/** |
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* Handle the "read" request of metadata/data files from Metacat |
... | ... | |
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// read metadata or data from Metacat |
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private void readFromMetacat(HttpServletResponse response, String docid, |
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String qformat, String abstrpath, String user, |
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String[] groups, boolean zip, ZipOutputStream zout)
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String[] groups, boolean zip, ZipOutputStream zout) |
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throws ClassNotFoundException, IOException, SQLException, |
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McdbException, Exception |
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{ |
... | ... | |
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try { |
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// MBJ: need to put filesize limit in Metacat config (metacat.properties) |
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MultipartParser mp = new MultipartParser(request, 200*1024*1024); // 200MB
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MultipartParser mp = new MultipartParser(request, 200*1024*1024); //200MB |
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Part part; |
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while ((part = mp.readNextPart()) != null) { |
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String name = part.getName(); |
... | ... | |
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try { |
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out = response.getWriter(); |
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} catch (IOException ioe2) { |
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System.err.println("Fatal Error: couldn't get response output stream."); |
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util.debugMessage("Fatal Error: couldn't get response "+ |
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"output stream."); |
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} |
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out.println("<?xml version=\"1.0\"?>"); |
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out.println("<error>"); |
Also available in: Unified diff
A new action named export was add to it. This action will export a zip output stream for a data package. In the zip output stream, meta data documents, data files and a html summary file are include. The stucture will looks like:
package----/metadata/metadata docments |
----/data/data files |
----html file