android与tomcat服务器交互实例

 

android与tomcat服务器交互实例

一、教程目的。

  本教程的目的在于教会怎么完成android与tomcat服务器的数据交互。
二、开发环境。
  Myeclipse8.5+jdk1.6+android2.3
三、开发步骤。
   (1)新建一个web项目，并添加struts2支持。
    new->webproject
   1在项目名称右键，Myeclipse->Add Struts Capabilities 

 struts specification 选择struts2.1
    然后选择完成

2新建一个action类

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package action;   import java.io.IOException;   import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;   import org.apache.struts2.ServletActionContext;   import com.opensymphony.xwork2.ActionSupport;   public class AndroidAction extends ActionSupport {         HttpServletRequest request=ServletActionContext.getRequest();         HttpServletResponse response = ServletActionContext.getResponse();         @Override         public String execute() throws Exception {                 // TODO Auto-generated method stub                 return super.execute();         }         public void test()         {                 String str = request.getParameter("test");                 System.out.println(str);                 writeOut("hello android");         }         /**          * 返回值          * @param jsonStr          */         public void writeOut(String jsonStr) {                 response.setContentType("html/txt");                 response.setCharacterEncoding("utf-8");                 response.setHeader("Pragma", "no-cache");                 response.setHeader("Cache-Control", "no-cache, must-revalidate");                 response.setHeader("Pragma", "no-cache");                 try {                           response.getWriter().write(jsonStr);                         response.getWriter().flush();                         response.getWriter().close();                 } catch (IOException e) {                         e.printStackTrace();                 }         } }

　　3.修改struts.xml

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<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <package name="androidaction" extends="json-default" namespace="/androidaction">   <action name="test" class="action.AndroidAction" method="test">            <result type="json" name="success">           <param name="contentType">text/html</param>      </result>      <result type="json" name="error">           <param name="contentType">text/html</param>      </result>   </action> </package> </struts>

　　4.发布web项目   AndroidWebserver上右键 run as Myeclipse server application

(2)新建一个android项目。
记得要加入commons-httpclient-3.1.jar依赖包
新建一个链接工具类ConnUtil.java代码如下

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public class HelloApacheServerActivity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         final ConnUtil cu = new ConnUtil();         Button btn = (Button)findViewById(R.id.sendMessage);         btn.setOnClickListener(new OnClickListener(){                           @Override                         public void onClick(View arg0) {                                 String s = cu.sayHello();                                 Toast.makeText(HelloApacheServerActivity.this,s,Toast.LENGTH_SHORT).show();                         }                           });     } }

　　对了，android项目要记得添加网络访问权限
<uses-permission android:name="android.permission.INTERNET"/>

最后验证一下
按下"say hello"按钮 在myeclipse 的console下可以看到"hello server" 这是从android端发来的消息
同时android会弹出一个Toast "hello android"这是从服务器返回的消息。

最后 完整工程下载: