Androidネットワークツール

Android開発では、リモートのサーバに接続してデータの読み取りを行う必要があります.Httpプロトコルでサーバから情報を読み出すのが一般的です.以下のコードは、Androidプロジェクトを開発する際に書いた接続ツールで、getとpostの2つのリクエストデータをカプセル化しています.

package com.zhang.net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
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.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;

import android.content.Context;

import com.zhang.exception.ExceptionHandle;
import com.zhang.exception.NullPointException;

public class NetUtil {
	private HttpClient httpClient = new DefaultHttpClient();
	private Context context;
	private String charSet = "UTF-8";

	public NetUtil(Context context) {
		this.context = context;

	}

	public String sendByGet(String url, List<ParameterEntity> parameters,boolean cacheable) throws ClientProtocolException, IOException {
		String result = null;
		if(cacheable == true){
			//        
		}else{
			if (url != null) {
				HttpUriRequest request = new HttpGet(url);
				if(parameters != null){
					BasicHttpParams params = new BasicHttpParams();
					for (ParameterEntity entity : parameters) {
						params.setParameter(entity.getKey(), entity.getValue());
					}
					request.setParams(params);
				}
				HttpResponse response = httpClient.execute(request);
				result = getContent(response);
			} else {
				ExceptionHandle.handle(context, new NullPointException());
			}
		}
		return result;
	}
	
	private String getContent(HttpResponse response) throws IllegalStateException, IOException{
		String result = null;
		if(response != null){
			HttpEntity httpEntity = response.getEntity();
			InputStream in = httpEntity.getContent();
			InputStreamReader reader = new InputStreamReader(in,charSet);
			BufferedReader bread = new BufferedReader(reader);
			char[] buf = new char[1024];
			StringBuffer buffer = new StringBuffer();
			int count = 0;
			while((count = bread.read(buf))!= -1){
				buffer.append(buf,0,count);
			}
			result = buffer.toString();
		}
		return result;
	}

	public String sendByPost(String url,List<ParameterEntity> parameters, boolean cacheable) throws ClientProtocolException, IOException {
		String result = null;
		if(cacheable == true){
			//        
		}else{
			HttpPost post = new HttpPost(url);
			post.setHeader("Accept-Charset", charSet);
			if(parameters != null){
				BasicHttpParams params = new BasicHttpParams();
				for (ParameterEntity entity : parameters) {
					params.setParameter(entity.getKey(), entity.getValue());
				}
				post.setParams(params);
			}
			HttpResponse response = httpClient.execute(post);
			result = getContent(response);
		}
		return result;
	}

}