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//将出现的所有异常都用AppExceptionpublic class AppException extends Exception { public int statusCode; public String responseMessage; public AppException(int status, String responseMessage) { super(responseMessage); this.statusCode = status; this.responseMessage = responseMessage; } public AppException(String detailMessage) { super(detailMessage); }} //像这样替换 @Override public T parse(HttpURLConnection connection,OnProgressUpdatedListener listener) throws AppException { try { int status = connection.getResponseCode(); if (status == HttpStatus.SC_OK) { ...... }else { //都看作是联网失败 throw new AppException(status,connection.getResponseMessage()); } } catch (Exception e) { throw new AppException(e.getMessage()); } }
所有异常
参数错误,403 服务器错误,500 服务器返回json格式不正确,导致反序列化不成功APPException还可以加在其它地方,eg,请求之前判断URL是否正确if (!URLUtil.isNetworkUrl(request.url)) { throw new AppException("the url :" + request.url + " is not valid"); }//public static boolean isNetworkUrl(String url) { if (url == null || url.length() == 0) { return false; } return isHttpUrl(url) || isHttpsUrl(url);}
考虑这样一种场景,当User登录之后很长一段时间都不用登录
方案很多:cookie、session、token 这里看一下 token:当User登录之后,服务器会返回一个token的字符串,这个字符串是一个UserID + 其它信息的一个MD5
把这个token记录下来,以后所有的请求都会加上这个token,把它解密出来判断是否失效,没有失效,回取出对应ID的所有数据
失效,返回403 + token 失效
//框架里面会写接口,还有请求队列中,我的是Request和RequestTaskpublic interface OnGlobalExceptionListener { //处理类似 token 失效这类的Exception,错误代码403 boolean handleException(AppException exception);}//Request public OnGlobalExceptionListener onGlobalExceptionListener; public void setGlobalExceptionListener(OnGlobalExceptionListener onGlobalExceptionListener) { this.onGlobalExceptionListener = onGlobalExceptionListener; }//RequestTask @Override protected void onPostExecute(Object o) { super.onPostExecute(o); if (o instanceof AppException) { if (request.onGlobalExceptionListener != null){ if(!request.onGlobalExceptionListener.handleException((AppException)o)){ request.iCallback.onFailure((AppException) o); } } } else { request.iCallback.onSuccess(o); } }
public class BaseActivity extends ActionBarActivity implements OnGlobalExceptionListener { @Override public boolean handleException(AppException e) { if (e.statusCode == 403) { //服务器拒绝访问 if("token invalid".equals(e.responseMessage)) {// TODO relogin return true; } } return false; }}
@Override public void onFailure(AppException e) { if (e.statusCode == 403) { if ("password incorrect".equals(e.responseMessage)) {// TODO } else if ("token invalid".equals(e.responseMessage)) {// TODO relogin } } e.printStackTrace();}
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