本文介紹了如何使用Android搭建客戶端，實現手機和服務器的交互。讓我們了解如何采用SSH框架，把服務器端的信息用JSON的形式發送到手機端。AD：筆者以前是學的JavaEE，由于項目需要要開發Android，所以臨時補了一個多星期，主要是手機端和服務器端交互，雙向開發的。首先在服務器端，我采用的是SSH框架，struts2集合了JSON插件，服務器和客戶端的信息交互采用的JSON來傳輸，由于在服務器端用了Struts2,所以我就用裝了一個JSON插件。這樣，很輕易的就把服務器端的信息用JSON的形式發送到了手機端。以下是代碼：首先，在服務器端搭建好SSH框架，具體細節就不在陳述。struts.xml配置如下：<packagename="login"extends="json-default"><actionname="login"class="com.jclick.test.LoginAction"method="login"><resulttype="json"><paramname="includeProperties">result</param></result></action>5. </package>6.<packagename="login"extends="json-default"><actionname="login"class="com.jclick.test.LoginAction"method="login"><resulttype="json"><paramname="includeProperties">result</param></result></action>11. </package>手機端的代碼如下：首先，手機端有一個緩存類，主要用于緩存一些手機端需要訪問的數據，這樣的好處是可以達達節省手機和服務器的交互，用單例實現的：1.packagecom.jclick.cache;2.importcom.jclick.bean.User;4.publicclassCache{6.privateUserUser;8.9.privateCache(){10.}/**構造單例*/privatestaticclassCacheHolder{privatestaticfinalCacheINSTANCE=newCache();}publicCachegetInstance(){returnCacheHolder.INSTANCE;}publicUsergetUser(){

returnUser;}publicvoidsetUser(UserUser){this.User=User;}25.}27.28.packagecom.jclick.cache;29.importcom.jclick.bean.User;31.32.publicclassCache{33.34.privateUserUser;35.36.privateCache(){9.50.51.}/**構造單例*/privatestaticclassCacheHolder{privatestaticfinalCacheINSTANCE=newCache();}publicCachegetInstance(){returnCacheHolder.INSTANCE;}publicUsergetUser(){returnUser;}publicvoidsetUser(UserUser){this.User=User;}52.53.接著開始書寫手機端的協議，用戶向服務器發送請求，同時服務器反饋給手機端信息的：1.tocol;2.3.importjava.io.BufferedReader;importjava.io.InputStreamReader;importjava.util.ArrayList;importjava.util.List;7.importorg.apache.http.HttpResponse;importorg.apache.http.NameValuePair;importorg.apache.http.client.HttpClient;importorg.apache.http.client.entity.UrlEncodedFormEntity;importorg.apache.http.client.methods.HttpPost;importorg.apache.http.impl.client.DefaultHttpClient;importorg.apache.http.message.BasicNameValuePair;importorg.json.JSONException;importorg.json.JSONObject;17.18.publicclassBaseProtocol{19.privateStringBuildersb=newStringBuilder();20.privateHttpClienthttpClient;privateHttpPosthttpRequest;privateHttpResponseresponse;24.privateList<NameValuePair>nameValuePair=newArrayList<NameValuePair>();26.BaseProtocol(){httpClient=newDefaultHttpClient();}30./***向服務器端發送請求**@paramurl*@throwsException*/protectedvoidpack(Stringurl)throwsException{httpClient=newDefaultHttpClient();httpRequest=newHttpPost(url);40.httpRequest.setEntity(newUrlEncodedFormEntity(nameValuePair));response=httpClient.execute(httpRequest);}44./***得到返回數據**@paramurl*@return*@throwsException*/protectedvoidparse()throwsException{//TODO狀態處理500200if(response.getStatusLine().getStatusCode()==200){55.BufferedReaderbufferedReader2=newBufferedReader(newInputStreamReader(response.getEntity().getContent()));for(Strings=bufferedReader2.readLine();s!=null;s=bufferedReader2.readLine()){sb.append(s);}}}64./***向服務器發送信息**@paramkey*@paramvalue*/

00022.123.124.publicvoidaddNameValuePair(Stringkey,Stringvalue){nameValuePair.add(newBasicNameValuePair(key,value));}/***返回JSONObject對象數據模型**@return*@throwsJSONException*/publicJSONObjectgetJSON()throwsJSONException{returnnewJSONObject(sb.toString());}}tocol;importjava.io.BufferedReader;importjava.io.InputStreamReader;importjava.util.ArrayList;importjava.util.List;importorg.apache.http.HttpResponse;importorg.apache.http.NameValuePair;importorg.apache.http.client.HttpClient;importorg.apache.http.client.entity.UrlEncodedFormEntity;importorg.apache.http.client.methods.HttpPost;importorg.apache.http.impl.client.DefaultHttpClient;importorg.apache.http.message.BasicNameValuePair;importorg.json.JSONException;importorg.json.JSONObject;publicclassBaseProtocol{privateStringBuildersb=newStringBuilder();privateHttpClienthttpClient;privateHttpPosthttpRequest;privateHttpResponseresponse;privateList<NameValuePair>nameValuePair=newArrayList<NameValuePair>();BaseProtocol(){httpClient=newDefaultHttpClient();}/***向服務器端發送請求**@paramurl*@throwsException*/protectedvoidpack(Stringurl)throwsException{httpClient=newDefaultHttpClient();

httpRequest=newHttpPost(url);httpRequest.setEntity(newUrlEncodedFormEntity(nameValuePair));response=httpClient.execute(httpRequest);}/***得到返回數據**@paramurl*@return*@throwsException*/protectedvoidparse()throwsException{//TODO狀態處理500200if(response.getStatusLine().getStatusCode()==200){BufferedReaderbufferedReader2=newBufferedReader(newInputStreamReader(response.getEntity().getContent()));for(Strings=bufferedReader2.readLine();s!=null;s=bufferedReader2.readLine()){sb.append(s);}}}/***向服務器發送信息**@paramkey*@paramvalue*/publicvoidaddNameValuePair(Stringkey,Stringvalue){nameValuePair.add(newBasicNameValuePair(key,value));}/***返回JSONObject對象數據模型**@return*@throwsJSONException*/publicJSONObjectgetJSON()throwsJSONException{returnnewJSONObject(sb.toString());}接著是登陸協議，在這里我只是模擬登陸使用的一個類，僅供大家參考：tocol;69.170.171.}importorg.json.JSONObject;.3.54.55.importcom.jclick.bean.User;publicclassLoginProtocolextendsBaseProtocol{privatefinalstaticStringURL="http://localhost:8080/test/login";publicbooleancheckLogin(Userusr){try{pack(URL);parse();JSONObjectobj=this.getJSON();if(obj.getString("result").equals("failed")){returnfalse;}else{returntrue;}}catch(Exceptione){e.printStackTrace();returnfalse;}}}tocol;importorg.json.JSONObject;importcom.jclick.bean.User;publicclassLoginProtocolextendsBaseProtocol{privatefinalstaticStringURL="http://localhost:8080/test/login";publicbooleancheckLogin(Userusr){try{pack(URL);parse();JSONObjectobj=this.getJSON();if(obj.getString("result").equals("failed")){returnfalse;}else{returntrue;}}catch(Exceptione){e.printStackTrace();returnfalse;}}}

然后是User實體類，主要用于保存用戶信息：1.packagecom.jclick.bean;2.3.publicclassUser{privateStringusername;privateStringpassword;publicStringgetUsername(){returnusername;}publicvoidsetUsername(Stringusername){this.username=username;}publicStringgetPassword(){returnpassword;}publicvoidsetPassword(Stringpassword){this.password=password;}18.}20.21.packagecom.jclick.bean;5.36.37.publicclassUser{privateStringusername;privateStringpassword;publicStringgetUsername(){returnusername;}publicvoidsetUsername(Stringusername){this.username=username;}publicStringgetPassword(){returnpassword;}publicvoidsetPassword(Stringpassword){this.password=password;}38.39.最后就是LoginActivity里邊判斷登陸的代碼了，詳細代碼不再貼出來了，僅貼一個判斷登陸的代碼:1.privatevoidcheckedData(){username=((EditText)findViewById(R.id.username)).getText().toString();password=((EditText)findViewById(R.id.password)).getText().toString();4.Useruser=newUser();user.setUsername(username);user.setPassword(password);LoginProtocollogin=newLoginProtocol();

booleanresult=login.checkLogin(user);10.if(result){SpiderCache.getInstance().setUserSession(user);Toas