需要引入Jsoup依赖：

        <dependency><!-- jsoup HTML parser library @ https://jsoup.org/ --><groupId>org.jsoup</groupId><artifactId>jsoup</artifactId><version>1.12.1</version></dependency>

Jsoup相关依赖：https://jsoup.org/
其他需要的是 FileHelper 类，参见：https://www.cnblogs.com/zifeiy/p/9224569.html
（不过我们这边可能需要将"UTF-8"改成"GBK" ~）
然后实现的类如下：

package com.zifeiy.cf_data_get.handle;import java.io.File;
import java.io.IOException;import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;import com.zifeiy.cf_data_get.assist.FileHelper;public class SubmissionInfoGet {public void getSubmission(int contestId, int submissionId) throws IOException {String urlString = "http://codeforces.com/contest/" + contestId + "/submission/" + submissionId;Document doc = Jsoup.connect(urlString).get();System.out.println("title = " + doc.title());String dirString = "D:/codeforces/" + submissionId;File dir = new File(dirString);if (dir.exists() == false) dir.mkdirs();File dataDir = new File(dirString + File.separator + "data");if (dataDir.exists() == false) dataDir.mkdirs();// 代码String codeString = doc.getElementById("program-source-text").text();File codeFile = new File(dirString + File.separator + "std.cpp");FileHelper.writeFile(codeFile, codeString);Elements inputElements = doc.getElementsByClass("file input-view");Elements outputElements = doc.getElementsByClass("file answer-view");int sz = inputElements.size();int cnt = 0;for (int i = 0; i < sz; i ++) {String inputTextString = inputElements.get(i).getElementsByClass("text").get(0).text();String outputTextString = outputElements.get(i).getElementsByClass("text").get(0).text();if (inputTextString.endsWith("...") == false) {
//              System.out.println("[input]\n" + inputTextString + "\n[output]\n" + outputTextString + "\n[end]");cnt ++;File inputFile = new File(dirString + File.separator + "data" + File.separator + cnt + ".in");FileHelper.writeFile(inputFile, inputTextString);File outputFile = new File(dirString + File.separator + "data" + File.separator + cnt + ".out");FileHelper.writeFile(outputFile, outputTextString);}}}// main for testpublic static void main(String[] args) throws IOException {new SubmissionInfoGet().getSubmission(1169, 54847813);}}

其中，contestId 和 submissionId 分别对应 比赛Id 和 提交Id 。