Arbeta med GridJs på serversidan

Arbeta med GridJs på serversidan

0. Ange rätt mappväg i Config

Config.setFileCacheDirectory för arbetsbokscache-filen (obligatorisk) Config.setPictureCacheDirectory för att spara bildfiler i arbetsboken (valfritt, standardvärdet är _piccache i filcache-mappen).

För lagringsdetaljer, vänligen kolla denna guide

1. Implementera GridCacheForStream

För lokal fil lagring, här är ett exempel:

public class LocalFileCache extends GridCacheForStream {

	@Override
	public void saveStream(InputStream s, String uid) {
		// make sure the directory is exist
		String filepath = Paths.get(Config.getFileCacheDirectory(), "streamcache", uid.replace('/', '.')).toString();
		try (FileOutputStream fos = new FileOutputStream(filepath.toString())) {
			s.reset(); // Equivalent to s.Position = 0 in C#
			byte[] buffer = new byte[1024];
			int length;
			while ((length = s.read(buffer)) > 0) {
				fos.write(buffer, 0, length);
			}
			fos.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	@Override
	public InputStream loadStream(String uid) {
		String filepath = Paths.get(Config.getFileCacheDirectory(), "streamcache", uid.replace('/', '.')).toString();
		try {
			return new FileInputStream(filepath);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return null;
		}
	}

	@Override
	public boolean isExisted(String uid) {
		String filepath = Paths.get(Config.getFileCacheDirectory(), "streamcache", uid.replace('/', '.')).toString();
		return Files.exists(Paths.get(filepath));
	}

	@Override
	public String getFileUrl(String uid) {
		return "/GridJs2/GetFileUseCacheStream?id=" + uid;
	}

}

2. Skriv json från kalkylarksfilen till svarsströmmen

            GridJsWorkbook wbj = new GridJsWorkbook();
            try (GZIPOutputStream gzipOutputStream = new GZIPOutputStream(response.getOutputStream())) {
                wbj.importExcelFile(filePath.toString());
                wbj.jsonToStream(gzipOutputStream, filename);
            } catch (IOException e) {
				e.printStackTrace();
            } catch (Exception e) {
				e.printStackTrace();
            }

3. Hämta bilder/former från kalkylbladet

//Gridjs will automatically zip all the images/shapes into a zip stream  and store it in cache using the cache implemention.

InputStream inputStream = GridJsWorkbook.CacheImp.loadStream(fileid);

4. Uppdatera kalkylbladet i cache

GridJsWorkbook gwb = new GridJsWorkbook();
//p is the update json,uid is the unique id for the spreadsheet
String ret = gwb.updateCell(p, uid);

5. Spara kalkylbladet i cache

GridJsWorkbook wb = new GridJsWorkbook();
//p is the update json,uid is the unique id for the spreadsheet
wb.mergeExcelFileFromJson(uid, p);
wb.saveToCacheWithFileName(uid, filename,password);

För detaljerad info kan du kolla exemplet här: https://github.com/aspose-cells/Aspose.Cells-for-java/tree/master/Examples_GridJs