android 简单的登录

<%@page import="java.io.PrintWriter"%>
<%@page import="com.sun.org.apache.xml.internal.serialize.Printer"%>
<%@page import="com.google.gson.JsonObject"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
//測试，仅仅用一个username登录。不设password
String userName = request.getParameter("userName");

PrintWriter pw = response.getWriter();
//仅仅要username符合集可登录
if(userName.equals("miquan")) {
//返回安卓端的json
JsonObject json = new JsonObject();
json.addProperty("success", true);
json.addProperty("sessionId", request.getSession().getId());

//保存在server端的session
request.getSession().setAttribute("userName", "I am a test name.");

pw.write(json.toString());
pw.flush();
} else {
JsonObject obj = new JsonObject();
obj.addProperty("success", false);
pw.write(obj.toString());
pw.flush();
}
%>

<%@page import="javax.websocket.Session"%>
<%@page import="java.io.PrintWriter"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
PrintWriter pw = response.getWriter();
//获取到同一个session，而不是从新生成一个session。这样就达到我要的效果了
pw.write((String)session.getAttribute("userName"));
pw.flush();
%>

//登录
btnLogin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FinalHttp fh = new FinalHttp();
fh.get("http://172.27.35.1:8080/login/index.jsp?

userName=miquan", new AjaxCallBack<Object>() {
@Override
public void onSuccess(Object t) {
//获取返回来的json
String str = t.toString();
str = str.trim();
try {
JSONObject obj = new JSONObject(str);
boolean success = obj.getBoolean("success");
//登录成功
if(success) {
//app = (MyApplication) this.getApplication();
//MyApplication加入了属性sessionId和isLogin
app.setLogin(true);
app.setSessionId(obj.getString("sessionId"));
Toast.makeText(app, "登录成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(app, "登录失败", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
super.onSuccess(t);
}
@Override
public void onFailure(Throwable t, int errorNo,
String strMsg) {
Log.e("miquan", "failure  " + strMsg);
super.onFailure(t, errorNo, strMsg);
}
});
}
});

//測试
btnSession.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
FinalHttp fh = new FinalHttp();
//加入session。连请求一起发送。这里server用的是java开发的
fh.addHeader("Cookie", "JSESSIONID=" + app.getSessionId());
fh.get("http://172.27.35.1:8080/login/session.jsp", new AjaxCallBack<Object>() {
@Override
public void onSuccess(Object t) {
Log.e("miquan", t.toString());
super.onSuccess(t);
}
@Override
public void onFailure(Throwable t, int errorNo,
String strMsg) {
Log.e("miquan", "failure  " + strMsg);
super.onFailure(t, errorNo, strMsg);
}
});
}
});