android 用戶端與服務端的通訊 發送get和post請求並擷取資料

import java.io.*; 
import java.net.*;
import java.util.*;


/**
 * @author  jiaruihua jrhhybh@163.com
 * @version  1.0
 */
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();  //①
// 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);  //②
// 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;
}
}

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


/**
 * @author  jiaruihua jrhhybh@163.com
 * @version  1.0
 */
public class MainActivity extends Activity
{
Button get , post;
TextView show;
private String TOURL = "http://192.168.56.1:8080/InetGetMsg/servlet/GetPostTestDemo";
// 代表格服務器響應的字串
String response;
Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
if(msg.what == 0x123)
{
// 設定show組件顯示伺服器響應
show.setText(response);
}
}
};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
get = (Button) findViewById(R.id.get);
post = (Button) findViewById(R.id.post);
show = (TextView)findViewById(R.id.show);
get.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
new Thread()
{
@Override
public void run()
{
response = GetPostUtil.sendGet(
TOURL
, "str=get");
// 發送訊息通知UI線程更新UI組件
handler.sendEmptyMessage(0x123);
}
}.start();
}
});
post.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
new Thread()
{
@Override
public void run()
{
response = GetPostUtil.sendPost(
TOURL
, "str=post");
}
}.start();
// 發送訊息通知UI線程更新UI組件
handler.sendEmptyMessage(0x123);
}
});
}
}

<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="發送get請求"
/>
<Button
android:id="@+id/post"  
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="發送post請求"
/>
</LinearLayout>
<TextView  
android:id="@+id/show"
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:gravity="top"
android:background="#ffff"
android:textColor="#f000"
android:textSize="16dp"
/>
</LinearLayout>

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 GetPostTestDemo extends HttpServlet {


/**
* Constructor of the object.
*/
public GetPostTestDemo() {
super();
}


/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}




public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.setContentType("text/html;charset=utf-8");// 亂碼-->中文格式化
doPost(request, response);

}






public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.setContentType("text/html;charset=utf-8");// 亂碼-->中文格式化
PrintWriter out = response.getWriter();

String result = request.getParameter("str");
if (result.equals("get")) {
out.write("接受get成功！");
System.out.println("接受get成功！");
}
if (result.equals("post")) {
out.write("接受post成功！");
System.out.println("接受post成功！");
}

out.flush();
out.close();
}


/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}


}