《SSO CAS单点系列》之 APP原生应用如何访问CAS认证中心

4.开发支持APP登录的移动服务端接口。接收APP登录请求，采用HttpClient转发至CAS认证中心登录，返回json数据解析并最终返回给客户端。本地会话采用redis维护,登录成功，返回access_token。

接口定义：url: /login.json
入参： username string
password string
出参： ret string
msg string
access_token string

核心代码如下：

作者：手插口袋_
链接：https://www.imooc.com/article/4200
来源：慕课网

https://www.imooc.com/article/4200

 @RequestMapping("/login.json")
 public @ResponseBody ResultBean login(HttpServletRequest request,
                      HttpServletResponse response) {

  ResultBean resultBean = new ResultBean();
  String username = request.getParameter("username");
  String password = request.getParameter("password");

  HttpClient httpClient = new DefaultHttpClient();

  String url = SSO_SERVER_URL + "?mode=app&service=" + SSO_CLIENT_SERVICE;

  HttpGet httpGet = new HttpGet(url);
  try{
   HttpResponse httpClientResponse = httpClient.execute(httpGet);
   int statusCode = httpClientResponse.getStatusLine().getStatusCode();
   if (statusCode == HttpStatus.SC_OK){
    String result = EntityUtils.toString(httpClientResponse.getEntity(),
               "utf-8").replace('
 ', ' ').replace('
 ', ' ').trim();
    //解析json数据
    ObjectMapper objectMapper = new ObjectMapper();
    LtBean ltBean = objectMapper.readValue(result, LtBean.class);
    List<NameValuePair> formparams = new ArrayList<NameValuePair>();
    formparams.add(new BasicNameValuePair("username", username));
    formparams.add(new BasicNameValuePair("password", password));
    formparams.add(new BasicNameValuePair("lt", ltBean.getLt()));
    formparams.add(new BasicNameValuePair("execution", ltBean.getExecution()));
    formparams.add(new BasicNameValuePair("_eventId", "submit"));

    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8");
    HttpPost httpPost = new HttpPost(SSO_SERVER_URL);
    httpPost.setEntity(entity);

    httpClientResponse = httpClient.execute(httpPost);
    statusCode = httpClientResponse.getStatusLine().getStatusCode();

    if (statusCode == HttpStatus.SC_OK){
      result = EntityUtils.toString(httpClientResponse.getEntity(), "utf-8")
                 .replace('
 ', ' ').replace('
 ', ' ').trim();

      objectMapper = new ObjectMapper();
      resultBean = objectMapper.readValue(result, ResultBean.class);
      if(resultBean.getRet().equals("")){
       String access_token = UUID.randomUUID().toString(); //会话句柄
       TokenUtil.setAccess_token(access_token, username); //放入redis
       resultBean.setRet("0");
       resultBean.setMsg("登录成功");
       resultBean.setAccess_token(access_token);
      }
     }
   }

  }catch(Exception e){
   e.printStackTrace();
   resultBean.setRet("-2");
   resultBean.setMsg("系统服务错误，请稍后再试!");
   return resultBean;
  }finally{
   httpClient.getConnectionManager().shutdown();
  }
   return resultBean;
 }

 作者：手插口袋_
 链接：https://www.imooc.com/article/4200
 来源：慕课网