会员申请：ID：keep

吾爱游客 *发表于 2018-2-10 14:46* · 发表于 2018-2-10 14:46

1、申请会员ID：Keep（或keep123）
2、个人邮箱：923823264@qq.com
3、原创技术文章：我目前上大二，课余时间充足，希望到贵站学习更多知识。下面附上一篇模拟登录校教务系统的教程：

Jsoup应该是Java最简单的网页解析框架
下载地址：https://jsoup.org/download
该实例以强智教务系统为例：http://jwxt.qlu.edu.cn
该教务系统带有验证码，我们就先获取验证码，从Chrome工具中得到验证码地址，如图：
分析Post登录参数，我们发现，参数中并没有我们提交的用户名，密码之类的参数，反而只有形如：
view:
1
useDogCode:
encoded:
2i50E6o109c1c24013L1286734P4HF%6mc%n%00D38232529
RANDOMCODE:
1zbz
IDA Console, Courier New, monospace">这样的参数。
于是我们回到网页表单中，找到对应的表单：
然后找到对应的方法：

package cn.zyzpp.eduCookie;import java.io.IOException;import java.util.HashMap;import java.util.Map;import java.util.Scanner;import org.jsoup.Connection;import org.jsoup.Connection.Method;import org.jsoup.Connection.Response;import org.jsoup.Jsoup;import org.junit.Before;import org.junit.Test;import cn.zyzpp.eduCookie2.S;/** * 模拟登录带验证码的教务系统 * * 2018-2-9 */public class JsoupSafeCode { private String url_safecode = "http://jwxt.qlu.edu.cn/verifycode.servlet?t=0.020974584"; // 验证码 private String url_encode = "http://jwxt.qlu.edu.cn/Logon.do?method=logon&flag=sess"; // 加密字符串 private String url_Login = "http://jwxt.qlu.edu.cn/Logon.do?method=logon"; // 登录 private String username = ""; private String password = ""; private String path = JsoupSafeCode.class.getResource("/").getPath().replaceAll("%20", " ") + "safecode.png"; private Map<String, String> cookie; /** * 下载验证码 * 保存Cookie * @throws IOException */ public void getSafeCode() throws IOException { Response response = Jsoup.connect(url_safecode).ignoreContentType(true) // 获取图片需设置忽略内容类型 .userAgent("Mozilla").method(Method.GET).timeout(3000).execute(); cookie = response.cookies(); byte[] bytes = response.bodyAsBytes(); Util.saveFile(path, bytes); System.out.println("保存验证码到：" + path); } /** * 登录教务系统 */ public void initLogin() throws IOException { S.print("输入验证码："); Scanner scan = new Scanner(System.in); String code = scan.next(); try { Map<String, String> data = new HashMap<String, String>(); data.put("view", "1"); data.put("encoded", getEncoded()); data.put("RANDOMCODE", code); Connection connect = Jsoup.connect(url_Login) .header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8") .userAgent("Mozilla").method(Method.POST).data(data).timeout(3000); for (Map.Entry<String, String> entry : cookie.entrySet()) { connect.cookie(entry.getKey(), entry.getValue()); } Response response = connect.execute(); S.println(response.parse().text().toString()); } catch (IOException e) { } } /** * 加密参数（依具体环境而定，加密算法一般在JS中获得） */ public String getEncoded() { try { Connection connect = Jsoup.connect(url_encode) .header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8") .userAgent("Mozilla").method(Method.POST).timeout(3000); for (Map.Entry<String, String> entry : cookie.entrySet()) { connect.cookie(entry.getKey(), entry.getValue()); } Response response = connect.execute(); String dataStr = response.parse().text(); // 加密encoded： String scode = dataStr.split("#")[0]; String sxh = dataStr.split("#")[1]; String code = username + "%%%" + password; String encoded = ""; for (int i = 0; i < code.length(); i++) { if (i < 20) { encoded = encoded + code.substring(i, i + 1) + scode.substring(0, Integer.parseInt(sxh.substring(i, i + 1))); scode = scode.substring(Integer.parseInt(sxh.substring(i, i + 1)), scode.length()); } else { encoded = encoded + code.substring(i, code.length()); i = code.length(); } } return encoded; } catch (IOException e) { } return null; }}

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package cn.zyzpp.eduCookie;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;public class Util { /** * 将字节流转换成文件 * * @param filename * @param data * @throws Exception */ public static void saveFile(String filename, byte[] data) { if (data != null) { String filepath = filename; File file = new File(filepath); if (file.exists()) { file.delete(); } try { FileOutputStream fos = new FileOutputStream(file); fos.write(data, 0, data.length); fos.flush(); fos.close(); } catch (IOException e) { e.printStackTrace(); } } }}