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AndroidHttpClient使用Cookie应用分析

应用Cookie 使用 分析
2023-06-13 09:14:41 时间
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：
复制代码代码如下:

publicclassLogInextendsHttpServlet{
/**
*ProcessesrequestsforbothHTTP
*<code>GET</code>and
*<code>POST</code>methods.
*
*@paramrequestservletrequest
*@paramresponseservletresponse
*@throwsServletExceptionifaservlet-specificerroroccurs
*@throwsIOExceptionifanI/Oerroroccurs
*/
protectedvoidprocessRequest(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("utf-8");
PrintWriterout=response.getWriter();
HttpSessionsession=request.getSession();
Stringinfo=request.getParameter("info");
session.setAttribute("info",info);
try{
/*TODOoutputyourpagehere.Youmayusefollowingsamplecode.*/
out.println("OK");
}finally{
out.close();
}
}
//<editor-folddefaultstate="collapsed"desc="HttpServletmethods.Clickonthe+signonthelefttoeditthecode.">
/**
*HandlestheHTTP
*<code>GET</code>method.
*
*@paramrequestservletrequest
*@paramresponseservletresponse
*@throwsServletExceptionifaservlet-specificerroroccurs
*@throwsIOExceptionifanI/Oerroroccurs
*/
@Override
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
processRequest(request,response);
}
/**
*HandlestheHTTP
*<code>POST</code>method.
*
*@paramrequestservletrequest
*@paramresponseservletresponse
*@throwsServletExceptionifaservlet-specificerroroccurs
*@throwsIOExceptionifanI/Oerroroccurs
*/
@Override
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
processRequest(request,response);
}
/**
*Returnsashortdescriptionoftheservlet.
*
*@returnaStringcontainingservletdescription
*/
@Override
publicStringgetServletInfo(){
return"Shortdescription";
}//</editor-fold>
}

复制代码代码如下:

publicclassInfoextendsHttpServlet{
/**
*ProcessesrequestsforbothHTTP
*<code>GET</code>and
*<code>POST</code>methods.
*
*@paramrequestservletrequest
*@paramresponseservletresponse
*@throwsServletExceptionifaservlet-specificerroroccurs
*@throwsIOExceptionifanI/Oerroroccurs
*/
protectedvoidprocessRequest(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
response.setContentType("text/html;charset=UTF-8");
PrintWriterout=response.getWriter();
HttpSessionsession=request.getSession();
Stringinfo=(String)session.getAttribute("info");
try{
/*TODOoutputyourpagehere.Youmayusefollowingsamplecode.*/
if(info==null)
out.print("null");
else
out.print(info);
}finally{
out.close();
}
}
//<editor-folddefaultstate="collapsed"desc="HttpServletmethods.Clickonthe+signonthelefttoeditthecode.">
/**
*HandlestheHTTP
*<code>GET</code>method.
*
*@paramrequestservletrequest
*@paramresponseservletresponse
*@throwsServletExceptionifaservlet-specificerroroccurs
*@throwsIOExceptionifanI/Oerroroccurs
*/
@Override
protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
processRequest(request,response);
}
/**
*HandlestheHTTP
*<code>POST</code>method.
*
*@paramrequestservletrequest
*@paramresponseservletresponse
*@throwsServletExceptionifaservlet-specificerroroccurs
*@throwsIOExceptionifanI/Oerroroccurs
*/
@Override
protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
processRequest(request,response);
}
/**
*Returnsashortdescriptionoftheservlet.
*
*@returnaStringcontainingservletdescription
*/
@Override
publicStringgetServletInfo(){
return"Shortdescription";
}//</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：
复制代码代码如下:
publicclassMainActivityextendsActivity{
privateAndroidHttpClientmHttpclient=AndroidHttpClient.newInstance("");
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.button1).setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
newThread(rTest).start();
}
});
}
privateStringtoString(InputStreamis)throwsIOException{
Stringret="";
InputStreamReaderisr=newInputStreamReader(is);
BufferedReaderbr=newBufferedReader(isr);
Stringtmp=br.readLine();
while(tmp!=null){
ret+=tmp;
tmp=br.readLine();
}
br.close();
returnret;
}
privateRunnablerTest=newRunnable(){
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
try{
BasicHttpContextcontext=newBasicHttpContext();
context.setAttribute(ClientContext.COOKIE_STORE,newBasicCookieStore());
HttpPosthttppost=newHttpPost("http://10.226.233.48:8080/WebApplication1/LogIn");
List<NameValuePair>nvps=newArrayList<NameValuePair>();
nvps.add(newBasicNameValuePair("info","你好世界！！"));
httppost.setEntity(newUrlEncodedFormEntity(nvps,"utf-8"));
HttpResponseresponse=mHttpclient.execute(httppost,context);
HttpEntityentity=response.getEntity();
Log.i("kagami",MainActivity.this.toString(entity.getContent()));
entity.consumeContent();
HttpGethttpget2=newHttpGet("http://10.226.233.48:8080/WebApplication1/Info");
HttpResponseresponse2=mHttpclient.execute(httpget2,context);
HttpEntityentity2=response2.getEntity();
Log.i("kagami",MainActivity.this.toString(entity2.getContent()));
entity2.consumeContent();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
};
｝

 
AndroidHttpClient和DefaultHttpClient的区别：
AndroidHttpClient不能在主线程中execute，会抛出异常。AndroidHttpClient通过静态方法newInstance获得实例，参数是代理，不用代理的话填“”。DefaultHttpClient默认是启用Cookie的，AndroidHttpClient默认不启用Cookie，要使用的话每次execute时要加一个HttpContext参数，并且添加CookieStore。用完后别忘了close不然不能创建新实例。

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