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(HttpURLConnection)强制转化
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HTTP的請求詳解在我的博客中已經講解過：
http://blog.csdn.net/xiazdong/article/details/7215296
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我在http://blog.csdn.net/xiazdong/article/details/7725867?中已經封裝了一個HTTP請求的輔助類，因此可以很簡單的發送GET、POST請求；
如HttpRequestUtil.sendGetRequest();是發送GET請求；
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一、核心代碼
HTTP GET 核心代碼：
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(1)String value = URLEncoder.encode(String value,"UTF-8");
(2)String path = "http://../path?key="+value;
(3)URL url = new URL(path);//此處的URL需要進行URL編碼；
(4)HttpURLConnection con = (HttpURLConnection)url.openConnection();
(5)con.setRequestMethod("GET");
(6)con.setDoOutput(true);
(7)OutputStream out = con.getOutputStream();
(8)out.write(byte[]buf);
(9)int code = con.getResponseCode();
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HTTP POST 核心代碼：
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(1)String value = URLEncoder.encode(String value,"UTF-8");
(2)byte[]buf = ("key="+value).getBytes("UTF-8");
(3)String path = "http://../path";
(4)URL url = new URL(path);//此處的URL需要進行URL編碼；
(5)HttpURLConnection con = (HttpURLConnection)url.openConnection();
(6)con.setRequestMethod("POST");
(7)con.setDoOutput(true);
(8)OutputStream out = con.getOutputStream();
(9)out.write(byte[]buf);
(10)int code = con.getResponseCode();
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二、GET和POST亂碼解決方式
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GET：
? 在doGet中加入：
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String name = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
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POST：
? 在doPost中加入：
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request.setCharacterEncoding("UTF-8");
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詳情請看我的博文：
http://blog.csdn.net/xiazdong/article/details/7217022
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三、服務器端代碼
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[java]?view plaincopy
package?org.xiazdong.servlet;????import?java.io.IOException;??import?javax.servlet.ServletException;??import?javax.servlet.annotation.WebServlet;??import?javax.servlet.http.HttpServlet;??import?javax.servlet.http.HttpServletRequest;??import?javax.servlet.http.HttpServletResponse;????@WebServlet("/PrintServlet")??public?class?PrintServlet?extends?HttpServlet?{????????protected?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{??????????String?name?=?new?String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");??????????String?age?=?new?String(request.getParameter("age").getBytes("ISO-8859-1"),"UTF-8");??????????System.out.println("姓名:"+name+"\n年齡："+age);??????}????????protected?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{??????????request.setCharacterEncoding("UTF-8");??????????System.out.println("姓名:"+request.getParameter("name")+"\n年齡："+request.getParameter("age"));??????}??}??
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四、Android端代碼
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在AndroidManifest.xml加入：
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[html]?view plaincopy
<uses-permission?android:name="android.permission.INTERNET"/>??
MainActivity.java
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[java]?view plaincopy
package?org.xiazdong.network.submit;????import?java.io.OutputStream;??import?java.net.HttpURLConnection;??import?java.net.URL;??import?java.net.URLEncoder;????import?android.app.Activity;??import?android.os.Bundle;??import?android.view.View;??import?android.view.View.OnClickListener;??import?android.widget.Button;??import?android.widget.EditText;??import?android.widget.Toast;????public?class?MainActivity?extends?Activity?{??????private?EditText?name,?age;??????private?Button?getbutton,?postbutton;??????private?OnClickListener?listener?=?new?OnClickListener()?{??????????@Override??????????public?void?onClick(View?v)?{??????????????try{??????????????????if?(getbutton?==?v)?{??????????????????????????????????????????StringBuilder?buf?=?new?StringBuilder("http://192.168.0.103:8080/Server/PrintServlet");??????????????????????buf.append("?");??????????????????????buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&");??????????????????????buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8"));??????????????????????URL?url?=?new?URL(buf.toString());??????????????????????HttpURLConnection?conn?=?(HttpURLConnection)url.openConnection();??????????????????????conn.setRequestMethod("GET");??????????????????????if(conn.getResponseCode()==200){??????????????????????????Toast.makeText(MainActivity.this,?"GET提交成功",?Toast.LENGTH_SHORT).show();??????????????????????}??????????????????????else?Toast.makeText(MainActivity.this,?"GET提交失敗",?Toast.LENGTH_SHORT).show();??????????????????}??????????????????if?(postbutton?==?v)?{??????????????????????????????????????????StringBuilder?buf?=?new?StringBuilder();??????????????????????buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&");??????????????????????buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8"));??????????????????????byte[]data?=?buf.toString().getBytes("UTF-8");??????????????????????URL?url?=?new?URL("http://192.168.0.103:8080/Server/PrintServlet");??????????????????????HttpURLConnection?conn?=?(HttpURLConnection)url.openConnection();??????????????????????conn.setRequestMethod("POST");??????????????????????conn.setDoOutput(true);?????????????????????OutputStream?out?=?conn.getOutputStream();??????????????????????out.write(data);??????????????????????if(conn.getResponseCode()==200){??????????????????????????Toast.makeText(MainActivity.this,?"GET提交成功",?Toast.LENGTH_SHORT).show();??????????????????????}??????????????????????else?Toast.makeText(MainActivity.this,?"GET提交失敗",?Toast.LENGTH_SHORT).show();??????????????????}??????????????}??????????????catch(Exception?e){????????????????????????????????}??????????}??????};????????@Override??????public?void?onCreate(Bundle?savedInstanceState)?{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.main);??????????name?=?(EditText)?this.findViewById(R.id.name);??????????age?=?(EditText)?this.findViewById(R.id.age);??????????getbutton?=?(Button)?this.findViewById(R.id.getbutton);??????????postbutton?=?(Button)?this.findViewById(R.id.postbutton);??????????getbutton.setOnClickListener(listener);??????????postbutton.setOnClickListener(listener);??????}??}??
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