《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