參考書:瘋狂 android講義
1、效果圖展示

2、界面布局
<?
xml version="1.0" encoding="utf-8"
?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
>
< LinearLayout
android:orientation ="horizontal"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:gravity ="center"
>
< Button
android:id ="@+id/get"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text ="@string/get"
/>
< Button
android:id ="@+id/post"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text ="@string/post"
/>
</ LinearLayout >
< EditText
android:id ="@+id/show"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:editable ="false"
android:cursorVisible ="false"
android:gravity ="top"
/>
</ LinearLayout >
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
>
< LinearLayout
android:orientation ="horizontal"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
android:gravity ="center"
>
< Button
android:id ="@+id/get"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text ="@string/get"
/>
< Button
android:id ="@+id/post"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text ="@string/post"
/>
</ LinearLayout >
< EditText
android:id ="@+id/show"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
android:editable ="false"
android:cursorVisible ="false"
android:gravity ="top"
/>
</ LinearLayout >
3、改發送get、post請求的工具類,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所代表遠程資源的響應
*/
public static String sendGet(String url, String params)
{
String result = "";
BufferedReader in = null;
try
{
String urlName = url + "?" + params;
URL realUrl = new URL(urlName);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設置通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
// 建立實際的連接
conn.connect();
// 獲取所有響應頭字段
Map<String, List<String>> map = conn.getHeaderFields();
// 遍歷所有的響應頭字段
for (String key : map.keySet())
{
System.out.println(key + "--->" + map.get(key));
}
// 定義BufferedReader輸入流來讀取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所代表遠程資源的響應
*/
public static String sendPost(String url, String params)
{
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try
{
URL realUrl = new URL(url);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設置通用的請求屬性
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請求必須設置如下兩行
conn.setDoOutput( true);
conn.setDoInput( true);
// 獲取URLConnection對象對應的輸出流
out = new PrintWriter(conn.getOutputStream());
// 發送請求參數
out.print(params);
// flush輸出流的緩沖
out.flush();
// 定義BufferedReade r輸入流來讀取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塊來關閉輸出流、輸入流
finally
{
try
{
if (out != null)
{
out.close();
}
if (in != null)
{
in.close();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}
}
{
/**
* 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所代表遠程資源的響應
*/
public static String sendGet(String url, String params)
{
String result = "";
BufferedReader in = null;
try
{
String urlName = url + "?" + params;
URL realUrl = new URL(urlName);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設置通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
// 建立實際的連接
conn.connect();
// 獲取所有響應頭字段
Map<String, List<String>> map = conn.getHeaderFields();
// 遍歷所有的響應頭字段
for (String key : map.keySet())
{
System.out.println(key + "--->" + map.get(key));
}
// 定義BufferedReader輸入流來讀取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所代表遠程資源的響應
*/
public static String sendPost(String url, String params)
{
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try
{
URL realUrl = new URL(url);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設置通用的請求屬性
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請求必須設置如下兩行
conn.setDoOutput( true);
conn.setDoInput( true);
// 獲取URLConnection對象對應的輸出流
out = new PrintWriter(conn.getOutputStream());
// 發送請求參數
out.print(params);
// flush輸出流的緩沖
out.flush();
// 定義BufferedReade r輸入流來讀取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塊來關閉輸出流、輸入流
finally
{
try
{
if (out != null)
{
out.close();
}
if (in != null)
{
in.close();
}
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
return result;
}
}
如果需要發送get請求只要調用URLConnection的connect()方法去建立實際的連接即可;如果需要發送post請求,則需要獲取URLConnection的OutputStream,然后再向網絡中輸出請求參數,如以上程序!!!
該程序所發送的get、post請求都是向本地局域網內:http://192/168.65.1:8080/abc應用下兩個頁面發送,這個應用都是部署在本機的web應用;4、activity程序代碼
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);
get.setOnClickListener( new OnClickListener()
{
@Override
public void onClick(View v)
{
String response = GetPostUtil
.sendGet("http://192.168.65.1:8080/abc/a.jsp" , null);
show.setText(response);
}
});
post.setOnClickListener( new OnClickListener()
{
@Override
public void onClick(View v)
{
String response = GetPostUtil
.sendPost("http://192.168.65.1:8080/abc/login.jsp"
, "name=crazyit.org&pass=leegang");
show.setText(response);
}
});
}
}
{
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);
get.setOnClickListener( new OnClickListener()
{
@Override
public void onClick(View v)
{
String response = GetPostUtil
.sendGet("http://192.168.65.1:8080/abc/a.jsp" , null);
show.setText(response);
}
});
post.setOnClickListener( new OnClickListener()
{
@Override
public void onClick(View v)
{
String response = GetPostUtil
.sendPost("http://192.168.65.1:8080/abc/login.jsp"
, "name=crazyit.org&pass=leegang");
show.setText(response);
}
});
}
}
url: http://greatverve.cnblogs.com/archive/2011/12/26/android-get-post.html
Android—Http連接之GET/POST請求
在Android SDK中提供了Apache HttpClient(org.apache.http.*)模塊。在這個模塊中涉及到兩個重要的類:HttpGet和HttpPost。
創建步驟:
1、創建HttpGet(或HttpPost)對象,將要請求的URL通過構造方法傳入HttpGet(或HttpPost)對象中;
2、使用DefaultHttpClient類的execute方法發送HTTP GET或HTTP POST 請求,並返回HttpResponse對象;
3、通過HttpResponse接口的getEntity方法返回響應信息。
雖然兩者都是按這樣的步驟來實現的,但是實際中兩者又有些區別,具體代碼如下:
HTTP GET請求:
String url;
//第一步,創建HttpGet對象
HttpGet httpGet = new HttpGet(url);
//第二步,使用execute方法發送HTTP GET請求,並返回HttpResponse對象
httpResponse = new DefaultHttpClient().execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200)
{
//第三步,使用getEntity方法活得返回結果
String result = EntityUtils.toString(httpResponse.getEntity());
}
HTTP POST請求:
String url;
//第一步,創建HttpPost對象
HttpPost httpPost = new HttpPost(url);
//設置HTTP POST請求參數必須用NameValuePair對象
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("bookname", etBookName.getText().toString()));
//設置httpPost請求參數
httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
//第二步,使用execute方法發送HTTP GET請求,並返回HttpResponse對象
httpResponse = new DefaultHttpClient().execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() == 200)
{
//第三步,使用getEntity方法活得返回結果
String result = EntityUtils.toString(httpResponse.getEntity());
}
上述就是對GET和POST方法的講解,兩者有相似的地方也有不同的地方,需要加以區別
