Android-use the struts2 server to interact with Android

I. server side:

First, build the struts2 environment and import necessary class libraries.

Web. xml file:

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <web-app version = "2.5" <br/> xmlns = "http://java.sun.com/xml/ns/javaee" <br/> xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" <br/> xsi: schemalocation = "http://java.sun.com/xml/ns/javaee <br/> http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <br/> <welcome-file-List> <br/> <welcome-File> index. JSP </welcome-File> <br/> </welcome-file-List> <br/> <filter-Name> struts2 </filter- name> <br/> <filter-class> Org. apache. struts2.dispatcher. filterdispatcher </filter-class> <br/> </filter> <br/> <filter-mapping> <br/> <filter-Name> struts2 </filter-Name> <br/> <URL-pattern>/* </url-pattern> <br/> </filter-mapping> <br/> </Web-app> <br/>
Struts. xml file:

<? XML version = "1.0" encoding = "GBK"?> <Br/> <! Doctype struts Public <br/> "-// Apache Software Foundation/DTD struts configuration 2.0/EN" <br/> "http://struts.apache.org/dtds/struts-2.0.dtd"> <br/> <struts> <br/> <package name = "testjson" extends = "JSON-Default"> </P> <p> <action name = "getjson" class = "com. shao. action. jsonaction "method =" JSON "> <br/> <result type =" JSON "> </result> <br/> </Action> </P> <p> </package> <br/> </struts>
Action class:

Package COM. shao. action; </P> <p> Import Java. io. ioexception; <br/> Import Java. util. arraylist; <br/> Import Java. util. list; </P> <p> Import javax. servlet. HTTP. httpservletrequest; <br/> Import javax. servlet. HTTP. httpservletresponse; </P> <p> Import Org. apache. struts2.interceptor. servletrequestaware; <br/> Import Org. apache. struts2.interceptor. servletresponseaware; </P> <p> Import COM. google. gson. gson; <br/> Import COM. opensymphony. xwork2.actionsupport; <br/> Import COM. shao. domain. music; </P> <p> public class jsonaction extends actionsupport implements servletrequestaware, <br/> servletresponseaware {</P> <p>/** <br/> */<br/> Private Static final long serialversionuid =-3604892179657815531l; <br/> private httpservletrequest request; <br/> private httpservletresponse response; <br/> private string format; <br/> Public String getformat () {<br/> return format; <br/>}</P> <p> Public void setformat (string format) {<br/> This. format = format; <br/>}</P> <p> @ override <br/> Public void setservletrequest (httpservletrequest request) {<br/> // todo auto-generated method stub <br/> This. request = request; <br/>}</P> <p> @ override <br/> Public void setservletresponse (httpservletresponse response) {<br/> // todo auto-generated method stub <br/> This. response = response; <br/>}</P> <p> Public void JSON () {<br/> List <music> List = new arraylist <music> (); <br/> // jsonarray = new jsonarray (); <br/> // jsonobject = new jsonobject (); <br/> gson = new gson (); <br/> music M1 = new music (); <br/> m1.setid (1); <br/> m1.setauthor ("You hongming "); <br/> m1.setname ("White lover"); <br/> m1.settime ("04:01"); <br/> list. add (M1); <br/> music m2 = new music (); <br/> m2.setid (2); <br/> m2.setauthor ("Eason Chan "); <br/> m2.setname (""); <br/> m2.settime ("04:44"); <br/> list. add (m2); <br/> music m3 = new music (); <br/> m3.setid (3); <br/> m3.setauthor ("Xie Yunfeng "); <br/> m3.setname ("yellow"); <br/> m3.settime (""); <br/> list. add (m3); <br/> JAVA. lang. reflect. type type = new COM. google. gson. reflect. typetoken <list <music> () {<br/> }. getType (); <br/> string beanlisttojson = gson. tojson (list, type); <br/> system. out. println ("gson -->" + beanlisttojson); <br/> try {<br/> response. setcharacterencoding ("GBK"); <br/> // response. setcontenttype ("text/XML; charset = UTF-8"); <br/> This. response. getwriter (). write (beanlisttojson); <br/>} catch (ioexception e) {<br/> E. printstacktrace (); <br/>}< br/>

This music entity class is also used by the android client.

Package COM. shao. domain; </P> <p> Public Class Music {</P> <p> private integer ID; <br/> private string name; <br/> private string time; <br/> private string author; <br/> Public integer GETID () {<br/> return ID; <br/>}< br/> Public void setid (integer ID) {<br/> This. id = ID; <br/>}< br/> Public String getname () {<br/> return name; <br/>}< br/> Public void setname (string name) {<br/> This. name = Name; <br/>}< br/> Public String gettime () {<br/> return time; <br/>}< br/> Public void settime (string time) {<br/> This. time = time; <br/>}< br/> Public String getauthor () {<br/> return author; <br/>}< br/> Public void setauthor (string author) {<br/> This. author = author; <br/>}< br/>
Access http: // localhost: 8080/client/getjson. Action; Result:

Ii. Android client:

Activity Class:

Package COM. shao. main; </P> <p> Import Java. util. arraylist; <br/> Import Java. util. hashmap; <br/> Import Java. util. list; <br/> Import Java. util. map; </P> <p> Import android. app. activity; <br/> Import android. OS. bundle; <br/> Import android. view. view; <br/> Import android. view. view. onclicklistener; <br/> Import android. widget. button; <br/> Import android. widget. listview; <br/> Import android. widget. simpleadapter; </P> <p> public class jsonclientactivity extends activity {<br/>/** called when the activity is first created. */<br/> private button update; <br/> private listview; <br/> @ override <br/> Public void oncreate (bundle savedinstancestate) {<br/> super. oncreate (savedinstancestate); <br/> setcontentview (R. layout. main); <br/> Update = (button) findviewbyid (R. id. update); <br/> listview = (listview) findviewbyid (R. id. list); <br/> Update. setonclicklistener (New onclicklistener () {</P> <p> @ override <br/> Public void onclick (view V) {<br/> // todo auto-generated method stub <br/> string urlstr = "http: // 10.0.2.2: 8080/client/getjson. action "; <br/> stringresult = gsonutil. getjson (urlstr); <br/> List <music> List = gsonutil. getlistfromjson (result); <br/> List <Map <string, Object> DATA = getadapterdata (list); </P> <p> simpleadapter adapter = new simpleadapter (jsonclientactivity. this, Data, R. layout. list, new string [] {"name", "author", "Time"}, new int [] {R. id. name, R. id. author, R. id. time}); <br/> listview. setadapter (adapter); <br/> // listview. <br/>}< br/>}); <br/>}< br/> private list <Map <string, Object> getadapterdata (list List) {<br/> List <Map <string, Object> DATA = new arraylist <Map <string, Object> (); <br/> for (INT I = 0; I <list. size (); I ++) {<br/> Map <string, Object> map = new hashmap <string, Object> (); <br/> music = (music) list. get (I); <br/> map. put ("name", music. getname (); <br/> map. put ("author", music. getauthor (); <br/> map. put ("time", music. gettime (); <br/> data. add (MAP); <br/>}< br/> return data; <br/>}< br/>}

Package COM. shao. main; </P> <p> Import java.net. uri; <br/> Import Java. util. list; </P> <p> Import Org. apache. HTTP. httpentity; <br/> Import Org. apache. HTTP. httpresponse; <br/> Import Org. apache. HTTP. client. httpclient; <br/> Import Org. apache. HTTP. client. methods. httppost; <br/> Import Org. apache. HTTP. impl. client. defaulthttpclient; <br/> Import Org. apache. HTTP. util. entityutils; </P> <p> Import COM. google. gson. gson; </P> <p> public class gsonutil {<br/> Public static string getjson (string URL) {</P> <p> httpclient client = new defaulthttpclient (); </P> <p> httppost request; <br/> try {<br/> request = new httppost (New uri (URL )); <br/> httpresponse response = client.exe cute (request); <br/> // determine whether the request is successful <br/> If (response. getstatusline (). getstatuscode () = 200) {// 200 indicates that the request is successful <br/> httpentity entity = response. getentity (); <Br/> If (entity! = NULL) {<br/> string beanlisttojson = entityutils. tostring (entity, "GBK"); <br/> return beanlisttojson; <br/>}</P> <p >} catch (exception E) {<br/> // todo: handle exception <br/>}< br/> return NULL; <br/>}< br/> Public static list <music> getlistfromjson (string JSON) {<br/> JAVA. lang. reflect. type type = new COM. google. gson. reflect. typetoken <list <music> () {<br/> }. getType (); <br/> gson = new gson (); <br/> List <music> List = gson. fromjson (JSON, type); <br/> return list; <br/>}< br/>
List. xml

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <relativelayout xmlns: Android = "http://schemas.android.com/apk/res/android" <br/> Android: Orientation = "vertical" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "fill_parent" <br/> <textview <br/> Android: id = "@ + ID/Name" <br/> Android: layout_width = "fill_parent" <br/> Android: layout_height = "wrap_content" <br/> Android: TEXT = "name" <br/> <textview <br/> Android: Id = "@ + ID/author" <br/> Android: layout_width = "wrap_content" <br/> Android: layout_height = "wrap_content" <br/> Android: layout_below = "@ ID/Name" <br/> Android: paddingtop = "5px" <br/> Android: TEXT = "author" <br/> </textview> <br/> <textview <br/> Android: id = "@ + ID/Time" <br/> Android: layout_width = "wrap_content" <br/> Android: layout_height = "wrap_content" <br/> Android: layout_below = "@ ID/Name" <br/> Android: layout_aligntop = "@ ID/author" <br/> Android: layout_alignparentright = "true" <br/> Android: TEXT = "time"> <br/> </textview> <br/> </relativelayout> <br/>

Running result:

The main interaction is completed through goolge's gson.