7). Network Interaction

昨天我们只对Android接收网络数据进行了简单介绍，今天我们完成了Android数据存储网络部分的所有内容。在此我将对这非常重要的内容进行总结。

 

       本篇日志是对Android与WEB应用服务之间进行数据交互的总结，下篇日志是一个经典而又让人十分 好奇的Android多线程断点下载应用的总结。下面我们开始Android与网络数据的交互。

 

一、创建WEB应用服务

       使用eclipse3.5创 建一个动态WEB应用，使用Struts1处理用户请求。我们此应用添加一个DispatchAction，并为它添加四个方法创建用于处理Android以各种方式提交的请求。

 

       1.创建动态WEB工程

       Project name:AndroidWebServer

       Target runtime:Apache Tomcat v6.0

       Dynamic web module version:2.5

       Configuration:Default Configuration for Apache Tomcat v6.0

 

       2.添加DispatchAction

package com.changcheng.web.struts.actions;

 

import java.io.File;

import java.io.FileOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import com.changcheng.web.struts.forms.DataForm;

 

public class AndroidWebServer extends DispatchAction {

 

         // Andoird以Get方式发送的请求

         public ActionForward sendDataByGet(ActionMapping mapping, ActionForm form,

                            HttpServletRequest request, HttpServletResponse response)

                            throws Exception {

                   String name = request.getParameter("name");

                   request.setAttribute("message", "Hello " + name);

                   return mapping.findForward("success");

         }

 

         // Andoird以Post方式发送的请求

         public ActionForward sendDataByPost(ActionMapping mapping, ActionForm form,

                            HttpServletRequest request, HttpServletResponse response)

                            throws Exception {

                   String name = request.getParameter("name");

                   request.setAttribute("message", "Hello " + name);

                   return mapping.findForward("success");

         }

                  

         // Andoird以表单方式发送的请求

         public ActionForward sendDataByForm(ActionMapping mapping, ActionForm form,

                            HttpServletRequest request, HttpServletResponse response)

                            throws Exception {

                   DataForm formbean = (DataForm) form;

                   System.out.println("StrData:" + formbean.getStrData());

                   // 获取 上传的文件

                   if (formbean.getFileData() != null

                                     && formbean.getFileData().getFileSize() > 0) {

                            // 设置 保存目录

                            File dir = new File(request.getSession().getServletContext()

                                               .getRealPath("/images"));

                            if (!dir.exists())

                                     dir.mkdirs();

                            // 保存 文件

                            FileOutputStream outStream = new FileOutputStream(new File(dir,

                                               formbean.getFileData().getFileName()));

                            outStream.write(formbean.getFileData().getFileData());// 保存文件

                            outStream.close();

                   }

                   return null;

         }

}

 

       3.向web.xml添加Struts1的ActionServlet

<servlet>

         <servlet-name>strutsservlet-name>

         <servlet-class>org.apache.struts.action.ActionServletservlet-class>

         <init-param>

                   <param-name>configparam-name>

                   <param-value>/WEB-INF/struts-config.xmlparam-value>

         init-param>

servlet>

<servlet-mapping>

         <servlet-name>strutsservlet-name>

         <url-pattern>*.dourl-pattern>

servlet-mapping>

 

       4.struts-config.xml

xml version="1.0" encoding="UTF-8"?>

DOCTYPE struts-config PUBLIC

          "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"

          "">

 

<struts-config>

         <form-beans>

                   <form-bean name="dataForm" type="com.changcheng.web.struts.forms.DataForm" />

         form-beans>

         <action-mappings>

                   <action path="/server"

                            type="com.changcheng.web.struts.actions.AndroidWebServer" name="dataForm"

                            scope="request" parameter="method">

                            <forward name="success" path="/WEB-INF/pages/success.jsp"/>

                   action>

         action-mappings>

struts-config>

 

 

二、创建Android应用

       1.创建Android工程

       Project name:AndroidWebClient

       BuildTarget:Android2.1

       Application name:AndroidWEB应用客户端

       Package name:com.changcheng.web.client

       Create Activity:AndroidWebClient

       Min SDK Version:7

 

       2.AndroidManifest.xml

xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android=""

       package="com.changcheng.web.client" android:versionCode="1"

       android:versionName="1.0">

       <application android:icon="@drawable/icon" android:label="@string/app_name">

             

              <uses-library android:name="android.test.runner" />

              <activity android:name=".AndroidWebClient" android:label="@string/app_name">

                     <intent-filter>

                            <action android:name="android.intent.action.MAIN" />

                            <category android:name="android.intent.category.LAUNCHER" />

                     intent-filter>

              activity>

 

       application>

       <uses-sdk android:minSdkVersion="7" />

      

       <uses-permission android:name="android.permission.INTERNET" />

      

       <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

      

       <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

      

       <instrumentation android:name="android.test.InstrumentationTestRunner"

              android:targetPackage="com.changcheng.web.client" android:label="Tests for My App" />

manifest>

       Android应用要访问Internet需 要添加权限。