实现的功能：借助于服务端，让Android获取服务端html内容

用到知识：

1）Handler初步了解

2）根据给定的url访问网络, 抓去html代码

3）将InputStream流转换成字符串信息，并在转换的过程中通过将String转换成字符数组进行编码

主要代码：

private static final String TAG = "MainActivity";
private static final int SUCCESS = 0;
protected static final int ERROR = 1;
private EditText etUrl;
private TextView tvHtml;
	
priva<strong>te Handler handler = new Handler()</strong> {
 
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case SUCCESS:
 <strong>tvHtml.setText((String) msg.obj);</strong>
break;
case ERROR:
Toast.makeText(MainActivity.this, "访问失败", 0).show();
break;
default:
break;
}
}
		
};
 
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
		
etUrl = (EditText) findViewById(R.id.et_url);
tvHtml = (TextView) findViewById(R.id.tv_html);
		
}
 
public void getHtml(View v) {
final String url = etUrl.getText().toString();
		
new Thread(new Runnable() {
			
@Override
public void run() {
// 请求网络
<strong>String html = getHtmlFromInternet(url);</strong>
				
if(!<strong>TextUtils.isEmpty(html)</strong>) {
// 更新textview的显示了
Message msg = new Message();
msg.what = SUCCESS;
msg.obj = html;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}
}).start();
}
 
/**
 * 根据给定的url访问网络, 抓去html代码
 * @param url
 * @return
 */
protected String<strong> getHtmlFromInternet(String url)</strong> {
		
try {
<strong>URL mURL = new URL(url);
HttpURLConnection conn = (HttpURLConnection) mURL.openConnection();</strong>
			
conn.setRequestMethod("GET");
conn.setConnectTimeout(10000);
conn.setReadTimeout(5000);
			
//conn.connect();
			
int responseCode = conn.getResponseCode();
			
if(responseCode == 200) {
InputStream is = conn.getInputStream();
String html = getStringFromInputStream(is);
return html;
} else {
Log.i(TAG, "访问失败: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
	
/**
 * 根据流返回一个字符串信息
 * @param is
 * @return
 * @throws IOException 
 */
private String getStringFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
		
while((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();
		
<strong>String html = baos.toString();// 把流中的数据转换成字符串, 采用的编码是: utf-8
		
String charset = "utf-8";
if(html.contains("gbk") || html.contains("gb2312")
|| html.contains("GBK") || html.contains("GB2312")) {// 如果包含gbk, gb2312编码, 就采用gbk编码进行对字符串编码
charset = "gbk";
}</strong>
		
html = new String(baos.toByteArray(), charset);// 对原有的字节数组进行使用处理后的编码名称进行编码
baos.close();
return html;
}

结果如下：

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