1、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Java EE，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，struts 2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 Struts 2,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

2、在陳述。struts.xml配置如下：result6.result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：packagecom.jclick.cache;2.importcom.jclick.bean.User;4.publicclassCache6.privateUserUser;8.privateCache()10. TOC o 1-5 h z /*構造單例*/Private static class CacheHolderPrivate static final CacheINSTANC

3、E=newCache();Public Cache getInstance()returnCacheHolder.INSTANCE;publicUsergetUser()returnUser; TOC o 1-5 h z publicvoidsetUser(UserUser)this.User=User;25.27.packagecom.jclick.cache;29.importcom.jclick.bean.User;31.publicclassCache33.privateUserUser;35.privateCache()37. TOC o 1-5 h z /*構造單例*/privat

4、estaticclassCacheHolderprivatestaticfinalCacheINSTANCE=newCache();publicCachegetInstance()returnCacheHolder.INSTANCE;publicUsergetUser()returnUser;publicvoidsetUser(UserUser)this.User=User;52.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:tocol;2.importjava.io.BufferedReader;importjava.io.InputStreamReader;

5、importjava.util.ArrayList;importjava.util.List;7.importorg.apache. HYPERLINK http:/http.HttpResponse http.HttpResponse;importorg.apache. HYPERLINK http:/http.NameValuePair http.NameValuePair;importorg.apache. HYPERLINK http:/http.client.HttpClient http.client.HttpClient;importorg.apache. HYPERLINK h

6、ttp:/http.client.entity.UrlEncodedFormEntity http.client.entity.UrlEncodedFormEntity;importorg.apache. HYPERLINK http:/http.client.methods.HttpPost http.client.methods.HttpPost;importorg.apache. HYPERLINK http:/http.impl.client.DefaultHttpClient http.impl.client.DefaultHttpClient;importorg.apache. H

7、YPERLINK http:/http.message.BasicNameValuePair http.message.BasicNameValuePair;importorg.json.JSONException;importorg.json.JSONObject;17.publicclassBaseProtocolprivateStringBuildersb=newStringBuilder();20.privateHttpClienthttpClient;privateHttpPosthttpRequest;privateHttpResponseresponse;24.privateLi

8、stnameValuePair=newArrayList();26.BaseProtocol()httpClient=newDefaultHttpClient(); TOC o 1-5 h z 30./*向服務器端發送請求*paramurl*throwsException*/protectedvoidpack(Stringurl)throwsExceptionhttpClient=newDefaultHttpClient();httpRequest=newHttpPost(url);40.httpRequest.setEntity(newUrlEncodedFormEntity(nameVal

9、uePair);response=httpClient.execute(httpRequest); TOC o 1-5 h z 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(

10、).getContent();for(Strings=bufferedReader2.readLine();s!=null;s=bufferedReader2.readLine()sb.append(s); TOC o 1-5 h z 64./*向服務器發送信息*paramkey*paramvalue*/publicvoidaddNameValuePair(Stringkey,Stringvalue)nameValuePair.add(newBasicNameValuePair(key,value); TOC o 1-5 h z 74./*返回JSONObject對象數據模型*return*t

11、hrowsJSONException*/publicJSONObjectgetJSON()throwsJSONExceptionreturnnewJSONObject(sb.toString();84.86.tocol;88.importjava.io.BufferedReader;importjava.io.InputStreamReader;importjava.util.ArrayList;importjava.util.List;93.importorg.apache. HYPERLINK http:/http.HttpResponse http.HttpResponse;import

12、org.apache. HYPERLINK http:/http.NameValuePair http.NameValuePair;importorg.apache. HYPERLINK http:/http.client.HttpClient http.client.HttpClient;importorg.apache. HYPERLINK http:/http.client.entity.UrlEncodedFormEntity http.client.entity.UrlEncodedFormEntity;importorg.apache. HYPERLINK http:/http.c

13、lient.methods.HttpPost http.client.methods.HttpPost;importorg.apache. HYPERLINK http:/http.impl.client.DefaultHttpClient http.impl.client.DefaultHttpClient;100.importorg.apache. HYPERLINK http:/http.message.BasicNameValuePair http.message.BasicNameValuePair;101.importorg.json.JSONException;102.impor

14、torg.json.JSONObject;103.publicclassBaseProtocolprivateStringBuildersb=newStringBuilder();106.privateHttpClienthttpClient;privateHttpPosthttpRequest;privateHttpResponseresponse;110.privateListnameValuePair=newArrayList();112.BaseProtocol()httpClient=newDefaultHttpClient(); TOC o 1-5 h z 116./*向服務器端發

15、送請求*paramurl*throwsException*/protectedvoidpack(Stringurl)throwsExceptionhttpClient=newDefaultHttpClient();httpRequest=newHttpPost(url);126.httpRequest.setEntity(newUrlEncodedFormEntity(nameValuePair);response=httpClient.execute(httpRequest); TOC o 1-5 h z 130./*得到返回數據*paramurl*return*throwsExceptio

16、n*/protectedvoidparse()throwsException/TODO 狀態處理 500200if(response.getStatusLine().getStatusCode()=200)141.BufferedReaderbufferedReader2=newBufferedReader(newInputStreamReader(response.getEntity().getContent();for(Strings=bufferedReader2.readLine();s!=null;s=bufferedReader2.readLine()sb.append(s); T

17、OC o 1-5 h z 150./*向服務器發送信息*paramkey*paramvalue*/publicvoidaddNameValuePair(Stringkey,Stringvalue)nameValuePair.add(newBasicNameValuePair(key,value);160./*返回JSONObject對象數據模型*return*throwsJSONException*/publicJSONObjectgetJSON()throwsJSONExceptionreturnnewJSONObject(sb.toString();170.接著是登陸協議，在這里我只是模擬

18、登陸使用的一個類，僅供大家參考:tocol;2.importorg.json.JSONObject;4.importcom.jclick.bean.User;6.publicclassLoginProtocolextendsBaseProtocol8.privatefinalstaticStringURL= HYPERLINK http:/localhost:8080/test/login http:/localhost:8080/test/login;10.publicbooleancheckLogin(Userusr)trypack(URL);parse();JSONObjectobj=t

19、his.getJSON();if(obj.getString(result).equals(failed)returnfalse;elsereturntrue; TOC o 1-5 h z catch(Exceptione)e.printStackTrace();returnfalse;26.28.tocol;30.importorg.json.JSONObject;32.importcom.jclick.bean.User;34.publicclassLoginProtocolextendsBaseProtocol36.privatefinalstaticStringURL= HYPERLI

20、NK http:/localhost:8080/test/login http:/localhost:8080/test/login;38.publicbooleancheckLogin(Userusr)trypack(URL);parse();JSONObjectobj=this.getJSON();if(obj.getString(result).equals(failed)returnfalse;elsereturntrue; TOC o 1-5 h z catch(Exceptione)e.printStackTrace();returnfalse;54.然后是User實體類，主要用于

21、保存用戶信息：packagecom.jclick.bean;2.publicclassUserprivateStringusername;privateStringpassword;publicStringgetUsername()returnusername; TOC o 1-5 h z publicvoidsetUsername(Stringusername)this .username=username;publicStringgetPassword()returnpassword;publicvoidsetPassword(Stringpassword)this.password=pa

22、ssword;18.20.packagecom.jclick.bean;22.publicclassUserprivateStringusername;privateStringpassword;publicStringgetUsername()returnusername; TOC o 1-5 h z publicvoidsetUsername(Stringusername)this .username=username;publicStringgetPassword()returnpassword;publicvoidsetPassword(Stringpassword)this.pass

23、word=password;38.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: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);Toast.makeText(getApplicationContext(),登錄成功，1000).show();Intentintent=newIntent();intent.setClass(LoginActivit