android端和Struts2服务器端通信，交互信息，参数采用JSON,使用了HttpClient与HttpPost类

首先是Struts端的程序，采用Struts2.1.6

1：web.xml的配置，主要是配置Struts2的filter

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<filter>

<filter-name>struts2</filter-name>

<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>struts2</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

2：struts.xml的内容：

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<package name="testjson" extends="json-default">

<action name="getjson" class="com.capinfotech.json.JSONAction" method="json">

<result type="json" />

</action>

</package>

3：JSONAciton的内容为：

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package com.capinfotech.json;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.interceptor.ServletResponseAware;

import com.opensymphony.xwork2.ActionSupport;

public class JSONAction extends ActionSupport implements ServletRequestAware, ServletResponseAware{

private static final long serialVersionUID = -989477296829078690L;

private HttpServletRequest request;

private HttpServletResponse response;

private String format;

public String getFormat() {

return format;

}

public void setFormat(String format) {

this.format = format;

}

public void setServletRequest(HttpServletRequest request) {

this.request = request;

}

public void setServletResponse(HttpServletResponse response) {

this.response = response;

}

public void json() {

JSONArray jsonArray = new JSONArray();

JSONObject jsonObject = new JSONObject();

jsonObject.put("id", 1);

jsonObject.put("title", "哈利波特");

jsonObject.put("timelength", 89);

JSONObject jsonObject1 = new JSONObject();

jsonObject1.put("id", 2);

jsonObject1.put("title", "速度与激情");

jsonObject1.put("timelength", 120);

JSONObject jsonObject2 = new JSONObject();

jsonObject2.put("id", 3);

jsonObject2.put("title", "变形金刚3");

jsonObject2.put("timelength", 100);

jsonArray.add(0, jsonObject);

jsonArray.add(1, jsonObject1);

jsonArray.add(2, jsonObject2);

try {

this.response.setCharacterEncoding("UTF-8");

this.response.getWriter().write(jsonArray.toString());

} catch (IOException e) {

e.printStackTrace();

}

}

}

4：运行效果为如下图：



5：运行注意事项，当Struts2中使用JSON时，一定要添加够JSON使用的包，否则会出错，要添加的包如下：

ezmorph-1.0.6.jar

commons-lang 2.4

commons-beanutils 1.7.0

commons-collections 3.2

commons-logging 1.1.1

Android端的程序和配置

1：androidmanifest.xml的内容为:

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="cn.capinfotech.json"

android:versionCode="1"

android:versionName="1.0">

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

<activity android:name=".MainActivity"

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="8" />

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

</manifest>

2：main.xml的内容主要是定义了ListView用来显示最新的电影咨询

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<ListView

android:id="@+id/videos"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

/>

</LinearLayout>

3：item.xml的内容，主要用来定义ListView里每个元素的显示方式

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

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView

android:layout_width="250dip"

android:layout_height="wrap_content"

android:id="@+id/title"

/>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:id="@+id/timelength"

/>

</LinearLayout>

4：定义了一个实体类Video

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package com.capinfotech.model;

public class Video {

private Integer id;

private String name;

private Integer time;

public Video() {

}

public Video(Integer id, String name, Integer time) {

super();

this.id = id;

this.name = name;

this.time = time;

}

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getTime() {

return time;

}

public void setTime(Integer time) {

this.time = time;

}

}

5：MainActivity的内容

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package cn.capinfotech.json;

import java.net.URI;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

import org.json.JSONArray;

import org.json.JSONObject;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

public class MainActivity extends Activity {

private static final String TAG = "MainActivity";

private List<HashMap<String, Object>> videos = null;

private HashMap<String, Object> video = null;

private ListView listView = null;

private static String url = "http://10.0.2.2:8088/Struts2_sxt/getjson.action";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

listView = (ListView)findViewById(R.id.videos);

getPDAServerData(url);

}

private void getPDAServerData(String url) {

HttpClient client = new DefaultHttpClient();

//提拱默认的HttpClient实现

HttpPost request;

try {

request = new HttpPost(new URI(url));

HttpResponse response = client.execute(request);

// 判断请求是否成功

if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功

HttpEntity entity = response.getEntity();

if (entity != null) {

String out = EntityUtils.toString(entity, "UTF-8");

Log.i(TAG, out);

JSONArray jsonArray = new JSONArray(out);

videos = new ArrayList<HashMap<String, Object>>();

for(int i = 0; i<jsonArray.length(); i++) {

JSONObject jsonObject = (JSONObject) jsonArray.get(i);

int id = jsonObject.getInt("id");

String name = jsonObject.getString("title");

int timelength = jsonObject.getInt("timelength");

video = new HashMap<String, Object>();

video.put("id", id);

video.put("name", name);

video.put("timelength", "时长为:" + timelength);

videos.add(video);

}

SimpleAdapter adapter = new SimpleAdapter(this, videos, R.layout.item,

new String[]{"name", "timelength"},

new int[]{R.id.title, R.id.timelength}

);

listView.setAdapter(adapter);

}

}

} catch(Exception e) {

e.printStackTrace();

Log.e(TAG, e.toString());

Toast.makeText(MainActivity.this, "获取数据失败", Toast.LENGTH_LONG).show();

}

}

}

6：程序界面效果图



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