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
json
适用于现代 C++ 的 JSON。
项目地址：https://gitcode.com/gh_mirrors/js/json
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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
<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：
<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：
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:
<?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
<?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
<?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
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
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
GitHub 加速计划 / js / json
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适用于现代 C++ 的 JSON。
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