Android网络通讯之HTTP请求通信(一)

Android网络通讯平台支持还是比较丰富的，除了兼容J2ME中的java.net api外还提供了一下Android平台独有的类android.net这个Package。似乎更强大的是org.apache.http类，这个是apache实验室开源的包，对于Http请求处理很方便。

java.net 与android.net 用法基本相同，下面主要用两个例子来介绍一下

一种是GET方式，一种是POST方式。然后介绍HttpClient的Get/Post方式方式

布局文件很简单，我用的都是同一个，一个TextView控件，一个Button控件.点击Button处理Http请求.

java代码如下:

package com.test.helloworld;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class Activity01 extends Activity {

private final String DEBUG_TAG = "System.out";

private TextView mTextView ;

private Button mButton;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.http);

mTextView = (TextView)findViewById(R.id.TextView01);

mButton = (Button)findViewById(R.id.Button01);

mButton.setOnClickListener(new httpListener());

}

//设置按钮监听器

class httpListener implements OnClickListener{

public void onClick(View v) {

refresh();

}

}

private void refresh(){

String httpUrl = "http://192.168.0.101:8080/Test/test.jsp";

//URL可以加参数

//String httpUrl = "http://192.168.0.101:8080/Test/test.jsp?par=abcdefg";

String resultData = "";

URL url = null;

try{

//创建一个URL对象

url = new URL(httpUrl);

}catch(MalformedURLException e){

Log.d(DEBUG_TAG, "create URL Exception");

}

//声明HttpURLConnection对象

HttpURLConnection urlConn = null;

//声明InputStreamReader对象

InputStreamReader in = null;

//声明BufferedReader对象

BufferedReader buffer = null;

String inputLine = null;

if(url != null){

try{

//使用HttpURLConnection打开连接

urlConn = (HttpURLConnection) url.openConnection();

//得到读取的内容(流)

in = new InputStreamReader(urlConn.getInputStream());

//创建BufferReader对象，输出时候用到

buffer = new BufferedReader(in);

//使用循环来读取数据

while ((inputLine = buffer.readLine()) != null) {

//在每一行后面加上换行

resultData += inputLine + "\n";

}

//设置显示取的的内容

if(resultData != null && !resultData.equals("")){

mTextView.setText(resultData);

}else{

mTextView.setText("读取的内容为空");

}

}catch(IOException e){

e.printStackTrace();

}finally{

try {

//关闭InputStreamReader

in.close();

//关闭URL连接

urlConn.disconnect();

} catch (IOException e) {

e.printStackTrace();

}

}

}else{

Log.d(DEBUG_TAG, "URL is NULL");

}

}

}