JSON数据解析Demo(暂没使用异步)

JSON的定义：


一种轻量级的数据交换格式，具有良好的可读和便于快速编写的特性。业内主流技术为其提供了完整的解决方案（有点类似于正则表达式 ，获得了当今大部分语言的支持），从而可以在不同平台间进行数据交换。JSON采用兼容性很高的文本格式，同时也具备类似于C语言体系的行为。 – Json.org

JSON Vs XML

1.JSON和XML的数据可读性基本相同
2.JSON和XML同样拥有丰富的解析手段
3.JSON相对于XML来讲，数据的体积小
4.JSON与JavaScript的交互更加方便
5.JSON对数据的描述性比XML较差
6.JSON的速度要远远快于XML.

运行效果图：
[img]
[img]http://dl.iteye.com/upload/attachment/0070/0412/ccec676a-d0ce-358b-b826-584e11de802b.jpg[/img]
[/img]
json数据结构图，数据有些多，截两张图：
[img]
[img]http://dl.iteye.com/upload/attachment/0070/0416/7ff40121-4f91-3f28-b49d-68473c42cdb6.jpg[/img]
[/img]
[img]
[img]http://dl.iteye.com/upload/attachment/0070/0418/89884cdf-a9a4-32d8-bce1-2155a725e1ab.jpg[/img]
[/img]

封装的一个JSONUtil工具类，代码如下：

package com.amaker.json;


import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.protocol.HTTP;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;

/**
 * @author zzl
 * Json封装的工具类.
 */
public class JSONUtil {

	private static final String TAG = "JSONUtil";

	/**
	 * 获取json内容
	 * @param  url
	 * @return JSONArray
	 * @throws JSONException 
	 * @throws ConnectionException 
	 */
	public static JSONObject getJSON(String url) throws JSONException, Exception {

		return new JSONObject(getRequest(url));
	}

	/**
	 * 向api发送get请求，返回从后台取得的信息。
	 * 
	 * @param url
	 * @return String
	 */
	protected static String getRequest(String url) throws Exception {
		return getRequest(url, new DefaultHttpClient(new BasicHttpParams()));
	}

	/**
	 * 向api发送get请求，返回从后台取得的信息。
	 * 
	 * @param url
	 * @param client
	 * @return String
	 */
	protected static String getRequest(String url, DefaultHttpClient client) throws Exception {
		String result = null;
		int statusCode = 0;
		HttpGet getMethod = new HttpGet(url);
		Log.d(TAG, "do the getRequest,url="+url+"");
		try {
			//getMethod.setHeader("User-Agent", USER_AGENT);

			HttpResponse httpResponse = client.execute(getMethod);
			//statusCode == 200 正常
			statusCode = httpResponse.getStatusLine().getStatusCode();
			Log.d(TAG, "statuscode = "+statusCode);
			//处理返回的httpResponse信息
			result = retrieveInputStream(httpResponse.getEntity());
		} catch (Exception e) {
			Log.e(TAG, e.getMessage());
			throw new Exception(e);
		} finally {
			getMethod.abort();
		}
		return result;
	}

	/**
	 * 处理httpResponse信息,返回String
	 * 
	 * @param httpEntity
	 * @return String
	 */
	protected static String retrieveInputStream(HttpEntity httpEntity) {

		int length = (int) httpEntity.getContentLength();		
		if (length < 0) length = 10000;
		StringBuffer stringBuffer = new StringBuffer(length);
		try {
			InputStreamReader inputStreamReader = new InputStreamReader(httpEntity.getContent(), HTTP.UTF_8);
			char buffer[] = new char[length];
			int count;
			while ((count = inputStreamReader.read(buffer, 0, length - 1)) > 0) {
				stringBuffer.append(buffer, 0, count);
			}
		} catch (UnsupportedEncodingException e) {
			Log.e(TAG, e.getMessage());
		} catch (IllegalStateException e) {
			Log.e(TAG, e.getMessage());
		} catch (IOException e) {
			Log.e(TAG, e.getMessage());
		}
		return stringBuffer.toString();
	}
}

编写主Activity代码MainActivity，代码如下：

package com.amaker.json;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
	 private static final String BASE_URL = "http://open.ifenghui.cn/mobilecms/interface/mobile.action?code=888032100100&m=get_coolimages&p=1&filter=all";  
	 private TextView tv_n;  
	 private TextView tv_error;  
	 private TextView tv_p;  
	 private TextView tv_pcount;  

	 private TextView tv_author;  
	 private ImageView img;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
        getJSON();
    }
    /**
     * 实例化组件
     */
    public void init(){
    	tv_n = (TextView) findViewById(R.id.textView0);
    	tv_error = (TextView) findViewById(R.id.textView1);
    	tv_p = (TextView) findViewById(R.id.textView2);
    	tv_pcount = (TextView) findViewById(R.id.textView3);
    	tv_author = (TextView) findViewById(R.id.textView4);
    	img = (ImageView) findViewById(R.id.imageView1);
    }
    /**
     * 解析json数据
     */
    public void getJSON(){
    	try {  
    		//获取后台返回的Json对象   
    		JSONObject mJsonObject = JSONUtil.getJSON(BASE_URL);  
    		String n = mJsonObject.getString("n");  
    		String error = mJsonObject.getString("error");  
    		String p = mJsonObject.getString("p");  
    		String pcount = mJsonObject.getString("pcount");  
    		//获得图书数组   
    		JSONArray mJsonArray = mJsonObject.getJSONArray("result");  
    		//获取第一本图书   
    		JSONObject firstBook = mJsonArray.getJSONObject(0); 
    		String author = firstBook.getString("author");
    		tv_n.setText(n);
    		tv_error.setText(error);
    		tv_p.setText(p);
    		tv_pcount.setText(pcount);
    		tv_author.setText(author);

      } catch (JSONException e) {  
    		e.printStackTrace();  
      } catch (Exception e) {  
    	    e.printStackTrace();  
      }  

    }

}

main.xml

<?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">
	<TextView
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:id="@+id/textView0"
		android:text="@string/hello" />
	<TextView
		android:text="TextView"
		android:id="@+id/textView1"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<TextView
		android:text="TextView"
		android:id="@+id/textView2"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<TextView
		android:text="TextView"
		android:id="@+id/textView3"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<TextView
		android:text="TextView"
		android:id="@+id/textView4"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" />
	<ImageView
		android:layout_width="wrap_content"
		android:src="@drawable/icon"
		android:layout_height="wrap_content"
		android:id="@+id/imageView1" />
</LinearLayout>

AndroidManifest.xml:
记得添加访问网络的权限！！！！！！！

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.amaker.json"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="10" />

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