解決spark-md5.js和java計算檔案md5值不一致問題
阿新 • • 發佈：2019-01-05
正確程式碼如下
java
htmlimport java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.math.BigInteger; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Test { public static void main(String[] args) { try { File file = new File("H://QQ圖片20171127002343.gif"); FileInputStream fis = new FileInputStream(file); MessageDigest md = MessageDigest.getInstance("MD5"); byte[] buffer = new byte[1024]; int length = -1; while ((length = fis.read(buffer, 0, 1024)) != -1) { md.update(buffer, 0, length); } BigInteger bigInt = new BigInteger(1, md.digest()); System.out.println("檔案md5值：" + bigInt.toString(16)); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
沒時間研究原理，之前應該是編碼方式問題，html頭部設定成UTF-8沒效果，棄療...換了網上新找的的程式碼ok<html> <head> <script type="text/javascript" src="spark-md5.js" ></script> <script src="https://cdn.bootcss.com/spark-md5/3.0.0/spark-md5.js"></script> </head> <body> <input type="file" id="file" /> <div id="box"></div> <button id="cal" type="button" onclick="calculate()">計算md5</button> </body> <script> function calculate(){ var fileReader = new FileReader(), box=document.getElementById('box'); blobSlice = File.prototype.mozSlice || File.prototype.webkitSlice || File.prototype.slice, file = document.getElementById("file").files[0], chunkSize = 2097152, // read in chunks of 2MB chunks = Math.ceil(file.size / chunkSize), currentChunk = 0, spark = new SparkMD5(); fileReader.onload = function(e) { console.log("read chunk nr", currentChunk + 1, "of", chunks); spark.appendBinary(e.target.result); // append binary string currentChunk++; if (currentChunk < chunks) { loadNext(); } else { console.log("finished loading"); box.innerText='MD5 hash:'+spark.end(); console.info("computed hash", spark.end()); // compute hash } }; function loadNext() { var start = currentChunk * chunkSize, end = start + chunkSize >= file.size ? file.size : start + chunkSize; fileReader.readAsBinaryString(blobSlice.call(file, start, end)); }; loadNext(); } </script> </html>
錯誤程式碼如下
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <form id="fileupload" action="" method="POST" enctype="multipart/form-data"> <div> <div> 新增檔案 <input type="file" name="" id="fileinput"> </div> <progress class='progressbar' value="0" max="100" style='width:500px;margin-top:20px'></progress> <div style='margin-top:20px'> <span id="handler_info" ></span> </div> </div> </form> <script src="./spark-md5.js" type="text/javascript"></script> <script> function get_filemd5sum(ofile) { var file = ofile; var tmp_md5; var blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice, // file = this.files[0], chunkSize = 8097152, // Read in chunks of 2MB chunks = Math.ceil(file.size / chunkSize), currentChunk = 0, spark = new SparkMD5.ArrayBuffer(), fileReader = new FileReader(); fileReader.onload = function(e) { // console.log('read chunk nr', currentChunk + 1, 'of', chunks); spark.append(e.target.result); // Append array buffer currentChunk++; var md5_progress = Math.floor((currentChunk / chunks) * 100); console.log(file.name + " 正在處理，請稍等," + "已完成" + md5_progress + "%"); var handler_info = document.getElementById("handler_info"); var progressbar = document.getElementsByClassName("progressbar")[0]; handler_info.innerHTML=file.name + " 正在處理，請稍等," + "已完成" + md5_progress + "%" progressbar.value =md5_progress; if (currentChunk < chunks) { loadNext(); } else { tmp_md5 = spark.end(); console.log(tmp_md5) handler_info.innerHTML = file.name + "的MD5值是：" + tmp_md5; } }; fileReader.onerror = function() { console.warn('oops, something went wrong.'); }; function loadNext() { var start = currentChunk * chunkSize, end = ((start + chunkSize) >= file.size) ? file.size : start + chunkSize; fileReader.readAsArrayBuffer(blobSlice.call(file, start, end)); } loadNext(); } var uploadfile = document.getElementById('fileinput') uploadfile.onchange = function(e){ var file = this.files[0]; if(!file) { alert('請選擇檔案！'); return false; } get_filemd5sum(file) } </script> </body> </html>
錯誤程式碼來源：傳送門
其實也沒錯，就是編碼方式可能有問題，研究半天不知道改哪裡spark-md5.js CDN地址：又拍雲