Android發送GET與POST請求的DEMO詳解

4.0後網路訪問必須單獨起一個子線程訪問，否則無法運行，這裡有一個發送請求的工具類GetPostUtil 複製代碼 代碼如下:public class GetPostUtil
{
/**
* 向指定URL發送GET方法的請求
*
* @param url
* 發送請求的URL
* @param params
* 請求參數，請求參數應該是name1=value1&name2=value2的形式。
* @return URL所代表遠端資源的響應
*/
public static String sendGet(String url, String params)
{
String result = "";
BufferedReader in = null;
try
{
String urlName = url + "?" + params;
URL realUrl = new URL(urlName);
// 開啟和URL之間的串連
URLConnection conn = realUrl.openConnection();
// 設定通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
// 建立實際的串連
conn.connect();
// 擷取所有回應標頭欄位
Map<String, List<String>> map = conn.getHeaderFields();
// 遍曆所有的回應標頭欄位
for (String key : map.keySet())
{
System.out.println(key + "--->" + map.get(key));
}
// 定義BufferedReader輸入資料流來讀取URL的響應
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
result += "\n" + line;
}
}
catch (Exception e)
{
System.out.println("發送GET請求出現異常！" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸入資料流
finally
{
try
{
if (in != null)
{
in.close();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}
/**
* 向指定URL發送POST方法的請求
*
* @param url
* 發送請求的URL
* @param params
* 請求參數，請求參數應該是name1=value1&name2=value2的形式。
* @return URL所代表遠端資源的響應
*/
public static String sendPost(String url, String params)
{
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try
{
URL realUrl = new URL(url);
// 開啟和URL之間的串連
URLConnection conn = realUrl.openConnection();
// 設定通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
// 發送POST請求必須設定如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
// 擷取URLConnection對象對應的輸出資料流
out = new PrintWriter(conn.getOutputStream());
// 發送請求參數
out.print(params);
// flush輸出資料流的緩衝
out.flush();
// 定義BufferedReader輸入資料流來讀取URL的響應
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null)
{
result += "\n" + line;
}
}
catch (Exception e)
{
System.out.println("發送POST請求出現異常！" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸出資料流、輸入資料流
finally
{
try
{
if (out != null)
{
out.close();
}
if (in != null)
{
in.close();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}
}

Activity類代碼
複製代碼 代碼如下:public class GetPostMain extends Activity
{
Button get , post;
EditText show;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
get = (Button) findViewById(R.id.get);
post = (Button) findViewById(R.id.post);
show = (EditText)findViewById(R.id.show);
//利用Handler更新UI
final Handler h = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what==0x123){
show.setText(msg.obj.toString());
}
}
};

get.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
new Thread(new AccessNetwork("GET", "http://192.168.1.88:8080/abc/a.jsp", null, h)).start();
}
});
post.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
new Thread(new AccessNetwork("POST", "http://192.168.1.88:8080/abc/login.jsp", "name=crazyit.org&pass=leegang", h)).start();
}
});
}
}
class AccessNetwork implements Runnable{
private String op ;
private String url;
private String params;
private Handler h;

public AccessNetwork(String op, String url, String params,Handler h) {
super();
this.op = op;
this.url = url;
this.params = params;
this.h = h;
}
@Override
public void run() {
Message m = new Message();
m.what = 0x123;
if(op.equals("GET")){
Log.i("iiiiiii","發送GET請求");
m.obj = GetPostUtil.sendGet(url, params);
Log.i("iiiiiii",">>>>>>>>>>>>"+m.obj);
}
if(op.equals("POST")){
Log.i("iiiiiii","發送POST請求");
m.obj = GetPostUtil.sendPost(url, params);
Log.i("gggggggg",">>>>>>>>>>>>"+m.obj);
}
h.sendMessage(m);
}
}