HttpURLConnection模拟登录学校的正方教务系统

　　教务系统登录界面

　　如图1-1

　　

　　　　　　　　　　　　　　　　1-1

　　

　　F12--》network查看登录教务系统需要参数：

　　__VIEWSTAT

　　txtUserName

　　TextBox2

　　txtSecretCode

　　RadioButtonList1

　　Button1

　　lbLanguage

　　hidPdrs

　　hidsc

　　如图1-2

　　

　　　　　　　　　　　　　　　　　　　　　　　1-2

　　或者登录之前开启wireshark也可捕获到登录系统时post的数据，使用"http.request.method==POST"过滤条件进行筛选

　　如图1-3

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　1-3

　　

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
 * Copyright (c) 2015
 * technology co., LTD)
 * All rights reserved.
 */
/**
 * Description        :
 * <p/>
 * <br><br>Time        : 2015-11-10 上午11:13:13
 *
 * @author ZXL
 * @version 1.0
 * @since 1.0
 */
public class TeachingAffaiSystemLogin {

    //验证码url
    //static String surl = "http://jwc.gduf.edu.cn/CheckCode.aspx";
    private static String main_url = "http://jwc.gduf.edu.cn/default2.aspx";
    private static String forword_url = "http://jwc.gduf.edu.cn/xs_main.aspx?xh=";
    private static String responseCookie = "";
    private static String __VIEWSTATE = "";
    private static String txtUserName = "教务系统账号";
    private static String TextBox2 = "教务系统密码";
    private static String txtSecretCode = "";
    private static String RadioButtonList1 = "学生";
    private static String Button1 = "";
    private static String lbLanguage = "";
    private static String hidPdrs = "";
    private static String hidsc = "";
    private static URL url;
    private static HttpURLConnection httpURLConn;
    private static String imageName = "code";
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        doGet();
        doPost();
    }

    /**
     * GET参数 __VIEWSTATE
     * @param args
     */
    private static void doGet(){
        try {
            //保存验证码图片
            url = new URL(main_url);
            httpURLConn = (HttpURLConnection)url.openConnection();
            httpURLConn.setDoInput(true);
            httpURLConn.setDoOutput(true);

            //拿到服务器随机生成的__VIEWSTATE
            String line = null;
            BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConn.getInputStream(),"GB2312"));

            String regEx = "<input.*type=\"hidden\".*name=\"__VIEWSTATE\".*value=\"(.*)\".*/>";
            while ((line = br.readLine())!=null){
                Pattern pat = Pattern.compile(regEx);
                Matcher mat = pat.matcher(line);
                boolean rs = mat.find();
                if (rs==true){
                    System.out.println(mat.groupCount());
                    for(int i=1;i<=mat.groupCount();i++){
                        System.out.println(mat.group(i));
                    }
                    __VIEWSTATE = mat.group(1);
                }
            }

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * post参数登录到教务系统
     * @param args
     */
    private static void doPost(){
        //post数据登录
        try {
            url = new URL(main_url);

            httpURLConn = (HttpURLConnection)url.openConnection();
            httpURLConn.setDoInput(true);
            httpURLConn.setDoOutput(true);
            httpURLConn.setRequestProperty("contentType", "GB2312");  

            StringBuilder sb = new StringBuilder();
            sb.append("__VIEWSTATE=" +URLEncoder.encode(__VIEWSTATE, "GB2312"));
            sb.append("&txtUserName="+URLEncoder.encode(txtUserName, "GB2312"));
            sb.append("&TextBox2="+URLEncoder.encode(TextBox2, "GB2312"));
            sb.append("&txtSecretCode="+URLEncoder.encode(txtSecretCode, "GB2312"));
            sb.append("&RadioButtonList1="+URLEncoder.encode(RadioButtonList1, "GB2312"));
            sb.append("&Button1="+Button1);
            sb.append("&lbLanguage="+lbLanguage);
            sb.append("&hidPdrs="+hidPdrs);
            sb.append("&hidsc="+hidsc);
            httpURLConn.setRequestProperty("Content-Length",
                        String.valueOf(sb.toString().length()));
            httpURLConn.setRequestProperty("Referer", main_url);
            httpURLConn.setRequestMethod("POST");

            httpURLConn.setRequestProperty("Cookie", responseCookie);
            //不重定向
            httpURLConn.setInstanceFollowRedirects(false);

            OutputStream os = httpURLConn.getOutputStream();
            os.write(sb.toString().getBytes("GB2312"));
            os.close();

            //post之后返回的页面
            BufferedReader bf = new BufferedReader(new InputStreamReader(httpURLConn.getInputStream(),"GB2312"));
            String line1 = null;
            while ((line1=bf.readLine())!=null){
                System.out.println(line1);
            }

            System.out.println("responseCode="+httpURLConn.getResponseCode());
            System.out.println("重定向地址"+httpURLConn.getHeaderField("Location"));

            responseCookie = httpURLConn.getHeaderField("Set-Cookie");
            System.out.println(responseCookie);

            //登录主界面
            String line = null;
            url = new URL(forword_url+URLEncoder.encode(txtUserName,"GB2312"));
            httpURLConn = (HttpURLConnection)url.openConnection();
            httpURLConn.setRequestProperty("Referer", forword_url+URLEncoder.encode(txtUserName,"GB2312"));
            httpURLConn.setRequestProperty("Content-Type", "text/xml; charset=GB2312");
            httpURLConn.setRequestProperty("Cookie", responseCookie);
            httpURLConn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36");
            httpURLConn.setRequestMethod("GET");
            httpURLConn.setDoInput(true);
            httpURLConn.setDoOutput(true);

            BufferedReader br = new BufferedReader(new InputStreamReader(httpURLConn.getInputStream(),"GB2312"));
            while ((line = br.readLine())!=null){
                System.out.println(line);
            }
        }
        catch (ProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (MalformedURLException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

　　先get页面main_url，从返回页面获取到hidden的viewstate,连同其它参数一起post到main_url。

　　

　　因为post到main_url之后，服务器端做了一个重定向处理，返回码为302，重定向页面为forword_url+“学号”（也可以在HttpURLConnection的getHeaderField("Location")获得）。

　　参考资料：http://www.blogfshare.com/php-curl-zhengfang.html