Android客戶端和服務器端數據交互的第四種方法

網上有很多例子來演示Android客戶端和服務器端數據如何實現交互不過這些例子大多比較繁雜，對於初學者來說這是不利的，現在介紹幾種代碼簡單、邏輯清晰的交互例子，本篇博客介紹第四種：

一、服務器端：

代碼1：添加名為“AndroidServerServlet.java”的文件

package com.ghj.packageofservlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AndroidServerServlet extends HttpServlet {

	private static final long serialVersionUID = 6792396567928634227L;

	public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
		response.setContentType(text/plain; charset=UTF-8);
		request.setCharacterEncoding(UTF-8);
		System.err.println(request.getParameter(clientData));
		PrintWriter printWriter = response.getWriter();
		printWriter.print(您好Android客戶端！);
		printWriter.flush();
		printWriter.close();
	}
}

代碼2：修改名為“web.xml”的文件

	
		AndroidServerServlet
		com.ghj.packageofservlet.AndroidServerServlet
	

	
		AndroidServerServlet
		/AndroidServerServlet
	

二、Android手機客戶端：

代碼1：下載名為android-async-http-1.4.6.jar的jar文件，下載地址：http://download.csdn.net/download/wangshuxuncom/8116169

代碼2：添加名為“AndroidClientActivity.java”的文件

package com.example.androidclient;

import org.apache.http.Header;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

public class AndroidClientActivity extends Activity {
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.android_client);

		Button sendButton = (Button) findViewById(R.id.send_button);
		sendButton.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				RequestParams requestParams = new RequestParams();
				requestParams.add(clientData, 您好服務器端！);
				new AsyncHttpClient().post(http://172.16.99.207:8080/AndroidServer/AndroidServerServlet, requestParams, new AsyncHttpResponseHandler() {
					@Override
					public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
						if(statusCode == 200){
							Toast.makeText(AndroidClientActivity.this, new String(responseBody), Toast.LENGTH_LONG).show();
						}
					}
					@Override
					public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
						Toast.makeText(AndroidClientActivity.this, 沒有獲取到Android服務器端的響應！, Toast.LENGTH_LONG).show();
					}
				});
			}
		});
	}
}

代碼3：添加名為“android_client.xml”的文件