Android+json+Struts2客户端

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上节课程我们重点介绍了struts2+json+android服务器段的开发,那这节课程我们就重点介绍在android客户端是怎么解析json集合|实体对象的方式

1、首先在这里我们新建一个android2.2的项目,新建完毕后因为此项目要进行网络访问操作,所以第一步应该在androidMainifest.xml文件中添加网络访问权限代码如下：

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

2、然后创建业务bean及service对应的类代码如下：

业务Bean与上节课程中的业务一致。

Servcie层：

接口：

package cn.redarmy.service;

import java.util.List;

import cn.redarmy.domain.Good;

public interface GoodService {

// 获取最新的商品信息

public abstract List<Good> findAll();

// 获取最新的单个商品的详细信息

public abstract Good findById();

}

Service接口的实现类：在这里我们首先完成对商品的详细信息的解析：

package cn.redarmy.service.Impl;

import java.io.IOException;

import java.net.URI;

import java.net.URISyntaxException;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

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

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

import org.apache.http.util.EntityUtils;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import cn.redarmy.domain.Good;

import cn.redarmy.service.GoodService;

public class GoodServiceImpl implements GoodService {

// 获取最新的商品信息

/* (non-Javadoc)

* @see cn.redarmy.service.Impl.GoodService#findAll()

@Override

public List<Good> findAll() {

// 创建请求HttpClient客户端

HttpClient httpClient = new DefaultHttpClient();

// 创建请求的url

String url = "http://192.168.4.32:8080/shop/csdn/listNewsGoods.action";

try {

// 创建请求的对象

HttpGet get = new HttpGet(new URI(url));

// 发送get请求

HttpResponse httpResponse = httpClient.execute(get);

// 如果服务成功返回响应

if (httpResponse.getStatusLine().getStatusCode() == 200) {

HttpEntity entity = httpResponse.getEntity();

if (entity != null) {

// 获取服务器响应的json字符串

String json = EntityUtils.toString(entity);

return parseArrayJosn(json);

}

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

//解析json数组对象

private List<Good> parseArrayJosn(String json) {

List<Good> goods = new ArrayList<Good>();

try {

JSONArray array = new JSONObject(json).getJSONArray("goods");

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

JSONObject obj = array.getJSONObject(i);

Good good = new Good(obj.getInt("id"), obj.getString("name"),

(float) obj.getDouble("price"));

goods.add(good);

}

} catch (JSONException e) {

e.printStackTrace();

}

return goods;

}

// 获取最新的单个商品的详细信息

/* (non-Javadoc)

* @see cn.redarmy.service.Impl.GoodService#findById()

@Override

public Good findById() {

// 创建请求HttpClient客户端

HttpClient httpClient = new DefaultHttpClient();

// 创建请求的url

String url = "http://192.168.4.32:8080/shop/csdn/findGood.action";

try {

// 创建请求的对象

HttpGet get = new HttpGet(new URI(url));

// 发送get请求

HttpResponse httpResponse = httpClient.execute(get);

// 如果服务成功返回响应

if (httpResponse.getStatusLine().getStatusCode() == 200) {

HttpEntity entity = httpResponse.getEntity();

if (entity != null) {

// 获取服务器响应的json字符串

String json = EntityUtils.toString(entity);

return parseObjJosn(json);

}

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

//解析json的单个对象

private Good parseObjJosn(String json) {

JSONObject obj = null;

try {

obj = new JSONObject(json).getJSONObject("good");

Good good = new Good(obj.getInt("id"), obj.getString("name"),

(float) obj.getDouble("price"));

return good;

} catch (JSONException e) {

e.printStackTrace();

}

return null;

}

创建用于显示商品信息的listView及对应的组件

创建good.xml文件

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

<LinearLayout

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

android:layout_width="match_parent"

android:layout_height="match_parent" android:orientation="horizontal">

</LinearLayout>

在main.xml文件中添加listView组件

<?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"

</LinearLayout>

最后完成GoodActivity的编写代码如下：

package cn.redarmy.activity;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import cn.redarmy.domain.Good;

import cn.redarmy.service.GoodService;

import cn.redarmy.service.Impl.GoodServiceImpl;

public class GoodActivity extends Activity {

private GoodService goodService = new GoodServiceImpl();

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//解析集合

/* try {

List<Good> goods = goodService.findAll();

ListView listView = (ListView) this.findViewById(R.id.goods);

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

for (Good good : goods) {

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

item.put("name", good.getName());

item.put("price", getResources().getString(R.string.price)+good.getPrice());

item.put("id", good.getId());

data.add(item);

}

SimpleAdapter adapter = new SimpleAdapter(this, data,

R.layout.good, new String[] { "name", "price" },

new int[] { R.id.name, R.id.price });

listView.setAdapter(adapter);

} catch (Exception e) {

Log.v("error", "网络连接失败");

e.printStackTrace();

}*/

//解析单个对象

try {

Good good = goodService.findById();

ListView listView = (ListView) this.findViewById(R.id.goods);

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

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

item.put("name", good.getName());

item.put("price", getResources().getString(R.string.price)+good.getPrice());

item.put("id", good.getId());

data.add(item);

SimpleAdapter adapter = new SimpleAdapter(this, data,

R.layout.good, new String[] { "name", "price" },

new int[] { R.id.name, R.id.price });

listView.setAdapter(adapter);

} catch (Exception e) {

Log.v("error", "网络连接失败");

e.printStackTrace();

}

通过以上方式就能实现struts2+android+json的开发了，希望你所有收获