Android 网络编程json.docx

Android 网络编程-STRUTS2,JSON，HttpClient 分类： Android智能手机开发 2011-04-21 15:26 243人阅读 评论(0) 收藏 举报 在Android开发过程中，我们需要访问网络上的Web资源，比如网络上的WEB请求。在这里Android就好像是一个终端，可以用来接收Web服务器端发送过来的数据。下面我以Struts2作为Web服务器端的Web框架。来说明Android客户端接收Web请求的过程。首先，我们要配置Web服务器端，添加Struts2所需要的JAR包（包括JSON包）下面是服务器端所要配置的JAR包，如下所示：我们看看json包，有如下： json-lib-*.jdk15.jar,struts2-json-plugin-*.jar,ezmorph-*.jar接下配置web.xml文件，代码如下所示：view plaincopy to clipboardprint?struts2org.apache.struts2.dispatcher.FilterDispatcherstruts2/*添加完JAR包后。我们来配置一下struts.xml文件，这个文件存放在src根目录下面，代码如下所示：view plaincopy to clipboardprint?1. 2. 5. 6. !-settingencoding,DynamicMethod,language7. 8. -9. 10. 12. 13. 17. 18. 19. 20. 22. 23. 24. 25. 26. 看看这个action 返回的是json 数据。而且是由LoginAction类去处理，它存放在com.dongzi.action下面。LoginAction类的代码如下：view plaincopy to clipboardprint?publicclassLoginActionextendsActionSupportimplementsServletRequestAware,ServletResponseAware/*/privatestaticfinallongserialVersionUID=1L;HttpServletRequestrequest;HttpServletResponseresponse;publicvoidsetServletRequest(HttpServletRequestrequest)this.request=request;publicvoidsetServletResponse(HttpServletResponseresponse)this.response=response;publicvoidlogin()try/HttpServletRequestrequest=ServletActionContext.getRequest(); /HttpServletResponseresponse=ServletActionContext.getResponse(); this.response.setContentType(text/html;charset=utf-8);this.response.setCharacterEncoding(UTF-8);/将要返回的实体对象进行json处理 /JSONObjectjson=JSONObject.fromObject(this.getUsername(); /输出格式如：id:1,username:zhangsan,pwd:123 /System.out.println(json); /this.response.getWriter().write(json.toString(); /username:mingg,password:123 JSONObjectjson=newJSONObject();/json.put(username,mingg); /json.put(password,123); /【这里在JSON中包含一个Map】 Mapmap=newHashMap();map.put(username,xiaomingg);map.put(password,1234);map.put(state,1);json.put(userbean,map);response.getWriter().write(json.toString();/userbean:username:100196,password:1234453,State:1 /*值的数组people:username:mingg,password:123,email:172,username:jie,password:111,email:172,username:yong,password:1232,email:1*/JSONArrayjsonArray=newJSONArray(); / /JSONObjectjson=newJSONObject(); /json.put(username,mingg); /json.put(password,123); /json.put(email,172); / /JSONObjectjson1=newJSONObject(); /json1.put(username,jie); /json1.put(password,111); /json1.put(email,172); / /JSONObjectjson2=newJSONObject(); /json2.put(username,yong); /json2.put(password,1232); /json2.put(email,1); / /jsonArray.add(0,json); /jsonArray.add(1,json1); /jsonArray.add(2,json2); / / /JSONObjectalObject=newJSONObject(); /alObject.put(people,jsonArray); /*programmers:*username:mingg,password:123,email:172,*username:jie,password:111,email:172,*username:yong,password:1232,email:1,*authors:*username:mingg,password:123,genre:sciencefiction,*username:jie,password:111,genre:fantasy,*username:yong,password:1232,genre:christianfiction,*musicians:*username:mingg,password:123,instrument:guitar,*username:jie,password:111,instrument:piano,*username:yong,password:1232,instrument:flute*/JSONArrayjsonArray=newJSONArray(); / /JSONObjectjson=newJSONObject(); /json.put(username,mingg); /json.put(password,123); /json.put(email,172); / /JSONObjectjson1=newJSONObject(); /json1.put(username,jie); /json1.put(password,111); /json1.put(email,172); / /JSONObjectjson2=newJSONObject(); /json2.put(username,yong); /json2.put(password,1232); /json2.put(email,1); / /jsonArray.add(0,json); /jsonArray.add(1,json1); /jsonArray.add(2,json2); / / / /JSONArrayjsonArray2=newJSONArray(); / /JSONObjectjson20=newJSONObject(); /json20.put(username,mingg); /json20.put(password,123); /json20.put(genre,sciencefiction); / /JSONObjectjson21=newJSONObject(); /json21.put(username,jie); /json21.put(password,111); /json21.put(genre,fantasy); / /JSONObjectjson22=newJSONObject(); /json22.put(username,yong); /json22.put(password,1232); /json22.put(genre,christianfiction); / /jsonArray2.add(0,json20); /jsonArray2.add(1,json21); /jsonArray2.add(2,json22); / / /JSONArrayjsonArray3=newJSONArray(); / /JSONObjectjson30=newJSONObject(); /json30.put(username,mingg); /json30.put(password,123); /json30.put(instrument,guitar); / /JSONObjectjson31=newJSONObject(); /json31.put(username,jie); /json31.put(password,111); /json31.put(instrument,piano); / /JSONObjectjson32=newJSONObject(); /json32.put(username,yong); /json32.put(password,1232); /json32.put(instrument,flute);/笛 / /jsonArray3.add(0,json30); /jsonArray3.add(1,json31); /jsonArray3.add(2,json32); / / /JSONObjectalObject=newJSONObject(); /alObject.put(programmers,jsonArray); /alObject.put(authors,jsonArray2); /alObject.put(musicians,jsonArray3); /*yong:1232:1*/获取任意节点的值：试例，第个节点，第三个子节点 /JSONArrayjsonArrayt11=(JSONArray)alObject.get(programmers); / /JSONObjectjsonObject11=(JSONObject)jsonArrayt11.get(2); / /Stringusername=jsonObject11.getString(username); /Stringpassword=jsonObject11.getString(password); /Stringemail=jsonObject11.getString(email); / /StringBuffersBuffer=newStringBuffer(); /sBuffer.append(username+:).append(password+:).append(email); /response.getWriter().write(username.toString(); /*JSONObjectjson=newJSONObject();json.put(login,login);*response.setContentType(text/html;charset=utf-8);*System.out.println(json);bytejsonBytes=*json.toString().getBytes(utf-8);*response.setContentLength(jsonBytes.length);*response.getOutputStream().write(jsonBytes);*/JSONObjectjson=newJSONObject(); /json.put(login,login); /bytejsonBytes=json.toString().getBytes(utf-8); /response.setContentType(text/html;charset=utf-8); /response.setContentLength(jsonBytes.length); /response.getOutputStream().write(jsonBytes); /response.getOutputStream().flush(); /response.getOutputStream().close(); catch(Exceptione)e.printStackTrace();/returnnull; 我下面简单说一下JSON解析过程。 通过访问http:/localhost:8888/AndroidServerApp/login.action，得到如下JSON数据：JSONObject json=new JSONObject(); /【这里在JSON中包含一个Map】 Map map=new HashMap(); map.put(username, xiaomingg); map.put(password, 1234); map.put(state, 1); json.put(userbean, map); response.getWriter().write(json.toString();服务器端的配置完成了。下面我来配置android客户端了。由于Android内置提拱了解析JSON数据的包。所以就不需要使用第三方包了Android 访问网络资源的代码如下所示：view plaincopy to clipboardprint?privatestaticStringurl=:8888/AndroidServerApp/login.action;getPDAServerData(url);privatevoidgetPDAServerData(Stringurl)HttpClientclient=newDefaultHttpClient();/提拱默认的HttpClient实现 HttpPostrequest;tryrequest=newHttpPost(newURI(url);HttpResponseresponse=client.execute(request);/判断请求是否成功 if(response.getStatusLine().getStatusCode()=200)/200表示请求成功 HttpEntityentity=response.getEntity();if(entity!=null)Stringout=EntityUtils.toString(entity);JSONObjectjsonObject;Stringusername=;Stringpassword=;StringstateStr=;UserBeanuserBean=newUserBean();try/userbean:username:100196,password:1234453,State:1 /JSONObjectjsonObject=newJSONObject(builder.toString().getJSONObject(userbean); jsonObject=newJSONObject(out).getJSONObject(userbean);userBean.setUsername(jsonObject.getString(username);userBean.setPassword(jsonObject.getString(password);userBean.setState(Integer.parseInt(jsonObject.getString(state);catch(JSONExceptione)/TODOAuto-generatedcatchblock e.printStackTrace();newAlertDialog.Builder(this).setMessage(userBean.getUsername()+:+userBean.getState().create().show();catch(URISyntaxExceptione)e.printStackTrace();newAlertDialog.Builder(this).setMessage(e.getMessage().create().show();catch(ClientProtocolExceptione)