forked from sheetjs/docs.sheetjs.com
38 lines
1.5 KiB
Java
38 lines
1.5 KiB
Java
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.Scanner;
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public class SheetJSNashorn {
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public static void main(String[] args) throws Exception {
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/* initialize */
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ScriptEngine engine = (new ScriptEngineManager()).getEngineByName("javascript");
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/* read script file */
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engine.eval("var global = (function(){ return this; }).call(null);");
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engine.eval(new Scanner(SheetJSNashorn.class.getResourceAsStream("/shim.min.js")).useDelimiter("\\Z").next());
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engine.eval(new Scanner(SheetJSNashorn.class.getResourceAsStream("/xlsx.full.min.js")).useDelimiter("\\Z").next());
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engine.eval("print('SheetJS Version ' + XLSX.version);");
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/* read spreadsheet bytes */
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engine.put("bytes", Files.readAllBytes(Paths.get(args[0])));
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/* convert signed byte array to JS Uint8Array or unsigned byte array */
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engine.eval("function b2a(b) {" +
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"var out = typeof Uint8Array == 'function' ? new Uint8Array(b.length) : new Array(b.length);" +
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"for(var i = 0; i < out.length; i++) out[i] = (b[i] + 256) & 0xFF;" +
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"return out;" +
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"}" +
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"var u8a = b2a(bytes)");
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/* parse workbook */
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engine.eval("var wb = XLSX.read(u8a, {type: 'array'})");
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/* get first worksheet as CSV */
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engine.eval("var ws = wb.Sheets[wb.SheetNames[0]];");
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Object res = engine.eval("XLSX.utils.sheet_to_csv(ws)");
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System.out.println(res);
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}
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}
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