Android模拟登陆综合教务系统客户端(java)-jsoup解析数据

现如今，基本的app都需要接入网络,下面介绍如何模拟登陆学校的教务系统获得里面的内容。

有Http基础的朋友都知道，我们是通过Get 与Post请求与服务器进行交互的，Get顾名思义就是获取信息，Post就是想服务器发请求，但是Post也可以用来获取信息并且比Get有很多优势，我们这里就是使用的Post。Java中有很多方式与服务器进行连接，常见的有HttpUrlCollection，HttpClient。两者的优缺点：

 需要用到的工具：httpwatch  (适用于火狐和IE浏览器）用于获得postdata.

1.如何获取验证码

private void DoGetVerifation() {

        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpPost httPost = new HttpPost(VERIFATIONURL);
                HttpClient client = new DefaultHttpClient();
                try {
                    HttpResponse httpResponse = client.execute(httPost);
                    byte[] bytes = new byte[1024];
                    bytes = EntityUtils.toByteArray(httpResponse.getEntity());
                    bmVerifation = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (bmVerifation == null) {
                    Looper.prepare()
                    Toast.makeText(MainActivity.this, "获取验证码失败请检查网络设置", Toast.LENGTH_SHORT).show();
                    Looper.loop()
                }
                Message msg = new Message();
                msg.arg1 = 10;
                handler.sendMessage(msg);
            }
        }).start();
    }

2.

post登陆信息

   
 private void DoLogin(final String user, final String password, final String verifation) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                DefaultHttpClient defaultclient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(LOGINURL);
                httpPost.setHeader("Cookie", Cookie);
                HttpResponse httpResponse;

                //设置post参数
                List params = new ArrayList();
               
                String inputText_user = userName.getText().toString();
                String inputText_password = passWord.getText().toString();
                String inputText_yanzhengma = yanzhengma.getText().toString();
                params.add(new BasicNameValuePair("groupId", ""));
                params.add(new BasicNameValuePair("j_username", user));
                params.add(new BasicNameValuePair("j_password", password));
                params.add(new BasicNameValuePair("j_captcha", verifation));
               
                params.add(new BasicNameValuePair("login", "登录"));

                //获得个人主界面的HTML
                try {
                    httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
                    httpResponse = defaultclient.execute(httpPost);
                    Log.i("xyz", String.valueOf(httpResponse.getStatusLine().getStatusCode()));

                    if (httpResponse.getStatusLine().getStatusCode() == 200) {
                        StringBuffer sb = new StringBuffer();

                        HttpEntity entity = httpResponse.getEntity();
                        MAINBODYHTML = EntityUtils.toString(entity);


                        Log.d("I",MAINBODYHTML);
                        //Toast.makeText(bangdingActivity.this, MAINBODYHTML, Toast.LENGTH_SHORT).show();

                        IsLoginSuccessful(MAINBODYHTML);
                    }
                } catch (UnsupportedEncodingException e) {

                    
                    e.printStackTrace();
                } catch (ClientProtocolException e) {

                    
                    e.printStackTrace();
                } catch (IOException e) {
                    
                    e.printStackTrace();
                }
            }
        }).start();
    }
 
  
 
  
 
  
 里面的parm参数需要通过httpwatch获取到postdata得到属性。 
  创建post,client response,与前面无异，我们获取数据的Post请求，比如说获取验证码请求是不需要参数的，但是我们登录需要发送给服务器 用户名 密码 验证码，于是我们为Post请求设置参数。 
  
 
  
 
  
 
  
获取到POST DATA就是需要上传的params
 
  
 
  
3.jsoup解析html
 
  
 
  
private void IsLoginSuccessful(String loginresult){
        Document doc = Jsoup.parse(loginresult);
        Message msg = new Message();
        //先判断是否登录成功，若成功直接退出
        Elements el = doc.select("div[id=error]");

        if(el.text().contains("您输入的验证码不正确")){
            Log.d("xyz", "验证码错误");

            msg.arg1 = 0;
            handler.sendMessage(msg);

        }
        else if(el.text().contains("密码不匹配")) {
            Log.d("xyz", "密码不匹配");
            msg.arg1 = 2;
            handler.sendMessage(msg);
        }
        else if(el.text().contains("用户名")){
            Log.d("1","用户名不存在");
            msg.arg1 = 5;
            handler.sendMessage(msg);
        }

        else{
            msg.arg1 = 6;
            handler.sendMessage(msg);
        }
    }