AndroidHttpClient使用Cookie
今天想把一个用使用了HttpClient的自动签到小程序移植到Android上，还好Android的SDK自带了HttpClient的包。翻Android的文档时发现官方还提供了一个实现了HttpClient接口的AndroidHttpClient，上网搜了下没发现关于AndroidHttpClient的文章。当然也可以继续使用DefaultHttpClient，但用为Android定制的AndroidHttpClient自然更好。
下面是2个测试用的HttpServlet：
public class LogIn extends HttpServlet {/*** Processes requests for both HTTP* <code>GET</code> and* <code>POST</code> methods.** @param request servlet request* @param response servlet response* @throws ServletException if a servlet-specific error occurs* @throws IOException if an I/O error occurs processRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType(“text/html;charset=UTF-8”);request.setCharacterEncoding(“utf-8”);PrintWriter out = response.getWriter();HttpSession session=request.getSession();String info=request.getParameter(“info”);session.setAttribute(“info”, info);try {out.println(“OK”);} finally {out.close();}}* Handles the HTTP* <code>GET</code> method.** @param request servlet request* @param response servlet response* @throws ServletException if a servlet-specific error occurs* @throws IOException if an I/O error occurs*/@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {processRequest(request, response);}/*** Handles the HTTP* <code>POST</code> method.** @param request servlet request* @param response servlet response* @throws ServletException if a servlet-specific error occurs* @throws IOException if an I/O error occurs*/@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {processRequest(request, response);}/*** Returns a short description of the servlet.** @return a String containing servlet description*/@Overridepublic String getServletInfo() {return “Short description”;}// </editor-fold>}
public class Info extends HttpServlet {/*** Processes requests for both HTTP* <code>GET</code> and* <code>POST</code> methods.** @param request servlet request* @param response servlet response* @throws ServletException if a servlet-specific error occurs* @throws IOException if an I/O error occurs processRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType(“text/html;charset=UTF-8”);PrintWriter out = response.getWriter();HttpSession session=request.getSession();String info=(String)session.getAttribute(“info”);try {(info==null)out.print(“null”);elseout.print(info);} finally {out.close();}}* Handles the HTTP* <code>GET</code> method.** @param request servlet request* @param response servlet response* @throws ServletException if a servlet-specific error occurs* @throws IOException if an I/O error occurs*/@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {processRequest(request, response);}/*** Handles the HTTP* <code>POST</code> method.** @param request servlet request* @param response servlet response* @throws ServletException if a servlet-specific error occurs* @throws IOException if an I/O error occurs*/@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {processRequest(request, response);}/*** Returns a short description of the servlet.** @return a String containing servlet description*/@Overridepublic String getServletInfo() {return “Short description”;}// </editor-fold>}
主要代码在processRequest里，其他可以不用看。
访问LogIn时传一个name为info的值，这时浏览器会得到一个用于定位服务端session的cookie。然后访问Info，如果有cookie的话服务端能找到刚才你传的值并返回给你，没带cookie的话就不能找到。
Android端代码：
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