Android入门：发送HTTP的GET和POST请求

服务器端代码

[java] 
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年龄："+age); 
    } 
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        request.setCharacterEncoding("UTF-8"); 
        System.out.println("姓名:"+request.getParameter("name")+"\n年龄："+request.getParameter("age")); 
    } 
} 

 

Android端代码

[java]
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) { 
                    /*
                     * 因为是GET请求，所以需要将请求参数添加到URL后，并且还需要进行URL编码
                     * URL = http://192.168.0.103:8080/Server/PrintServlet?name=%E6%88%91&age=20
                     * 此处需要进行URL编码因为浏览器提交时自动进行URL编码
                     * */ 
                    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提交失败", Toast.LENGTH_SHORT).show(); 
                } 
                if (postbutton == v) { 
                    /*
                     * 如果是POST请求，则请求参数放在请求体中，
                     * name=%E6%88%91&age=12
                     * 
                     * */ 
                    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); //如果要输出，则必须加上此句 
                    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提交失败", Toast.LENGTH_SHORT).show(); 
                } 
            } 
            catch(Exception e){ 
                 
            }   www.2cto.com
        } 
    }; 
 
    @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); 
    } 
}