从HTML文件中取出JS加密需要的参数，并调用js内的加密算法

背景，爬虫程序需要模拟登陆，账号密码是经js加密的，加密所需的参数需要从html页面中取出

import javax.script.Invocable;import javax.script.ScriptEngine;import javax.script.ScriptEngineManager;import javax.script.ScriptException;import java.io.*;import java.util.regex.Matcher;import java.util.regex.Pattern;

public class ScriptEngineTest {    public static void main(String[] args) throws IOException, ScriptException, NoSuchMethodException {        ScriptEngineManager manager = new ScriptEngineManager();        ScriptEngine engine = manager.getEngineByName("javascript");        String jsFileName = "src/main/resources/static/ss.js";        String htmlFileName = "src/main/resources/static/url.html";        Pattern pattern = Pattern.compile("\"10001\", \"\", \"(.*?)\"");        String htmldatas = readfile(htmlFileName);        String key = getkey(pattern, htmldatas);        System.out.println("Key=" + key);        FileReader reader = new FileReader(jsFileName);        engine.eval(reader);        if (engine instanceof Invocable) {            Invocable invoke = (Invocable) engine;            String c = (String) invoke.invokeFunction("find", "10001", key, "111111");            System.out.println("加密后：" + c);        }        reader.close();    }

    public static String readfile(String filePath) {        File file = new File(filePath);        InputStream input = null;        try {            input = new FileInputStream(file);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        StringBuffer buffer = new StringBuffer();        byte[] bytes = new byte[1024];        try {            for (int n; (n = input.read(bytes)) != -1; ) {                buffer.append(new String(bytes, 0, n, "UTF-8"));            }        } catch (IOException e) {            e.printStackTrace();        }        return buffer.toString();    }

    public static String getkey(Pattern pattern, String htmldatas) {        Matcher matcher = pattern.matcher(htmldatas);        String htmldata = "";        String key = "";        if (matcher.find()) {            htmldata = matcher.group();            System.out.println("htmldata=" + htmldata);            String ss[] = htmldata.split(",");            key = ss[2].replace("\"","").trim();        }        return key;    }}

原文地址：https://www.cnblogs.com/jakin3130/p/10559425.html