Android HTTP实例使用GET方法和POST方法发送请求（通过Apache接口实现）

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Web程序：使用GET和POST方法发送请求

　　首先利用MyEclispe+Tomcat写好一个Web程序，实现的功能就是提交用户信息：用户名和年龄，使用GET和POST两种提交方式。

　　用浏览器打开：

　　不管以哪一种方式，提交以后显示如下页面，将提交的信息再显示出来。

　　关键代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>    <body>    This is 圣骑士Wind's page. <br>    <p>        以GET方法发送：<br>    <form action="servlet/WelcomeUserServlet" method="get">        Username: <input type="text" name="username" value="">        Age: <input type="text" name="age" value="">        <input type="submit" value="Submit">    </form>    </p>        <p>        以POST方法发送：<br>    <form action="servlet/WelcomeUserServlet" method="post">        Username: <input type="text" name="username" value="">        Age: <input type="text" name="age" value="">        <input type="submit" value="Submit">    </form>    </p>  </body></html>

index.jsp

　　第二个页面显示结果：

package com.shengqishiwind;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 WelcomeUserServlet extends HttpServlet{    /**     * The doGet method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to get.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {        process(request, response);    }    /**     * The doPost method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to post.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {        process(request, response);    }        private void process(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException    {        String username = request.getParameter("username");        String age = request.getParameter("age");                response.setContentType("text/html");        PrintWriter out = response.getWriter();                out.println("<html><head><title>Welcome!</title></head>");        out.println("<body> Welcome my dear friend!<br>");        out.println("Your name is: " + username + "<br>");        out.println("And your age is: " + age + "</body></html>");                out.flush();        out.close();            }}

WelcomeUserServlet

Android程序：使用GET方法和POST方法发送请求

　　上面是用浏览器访问页面并提交数据，如果想在Android客户端提交，服务器端的代码是不用变的，只要写好客户端代码即可：

　　首先要在manifest中加上访问网络的权限：

<manifest ... >    <uses-permission android:name="android.permission.INTERNET" />    ...</manifest>

　　布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Username:" />    <EditText        android:id="@+id/name"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:inputType="text" />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="User Age:" />    <EditText        android:id="@+id/age"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:inputType="number" />    <Button        android:id="@+id/submit_get"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Submit using GET" />    <Button        android:id="@+id/submit_post"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Submit using POST" />    <TextView        android:id="@+id/result"        android:layout_width="match_parent"        android:layout_height="wrap_content"         android:textColor="#0000FF"        android:textSize="14sp">    </TextView></LinearLayout>

activity_http_demo2.xml

主要Activity代码如下：

package com.example.httpdemo2;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class HttpDemo2Activity extends Activity{    private String TAG = "http";    private EditText mNameText = null;    private EditText mAgeText = null;    private Button getButton = null;    private Button postButton = null;    private TextView mResult = null;    // 基本地址：服务器ip地址：端口号/Web项目逻辑地址+目标页面（Servlet）的url-pattern    private String baseURL = "http://192.168.11.6:8080/HelloWeb/servlet/WelcomeUserServlet";    @Override    protected void onCreate(Bundle savedInstanceState)    {        Log.i(TAG, "onCreate");        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_http_demo2);        mNameText = (EditText) findViewById(R.id.name);        mAgeText = (EditText) findViewById(R.id.age);        mResult = (TextView) findViewById(R.id.result);        getButton = (Button) findViewById(R.id.submit_get);        getButton.setOnClickListener(mGetClickListener);        postButton = (Button) findViewById(R.id.submit_post);        postButton.setOnClickListener(mPostClickListener);    }    private OnClickListener mGetClickListener = new View.OnClickListener()    {        @Override        public void onClick(View v)        {            Log.i(TAG, "GET request");            // 先获取用户名和年龄            String name = mNameText.getText().toString();            String age = mAgeText.getText().toString();            // 使用GET方法发送请求,需要把参数加在URL后面，用？连接，参数之间用&分隔            String url = baseURL + "?username=" + name + "&age=" + age;            // 生成请求对象            HttpGet httpGet = new HttpGet(url);            HttpClient httpClient = new DefaultHttpClient();            // 发送请求            try            {                HttpResponse response = httpClient.execute(httpGet);                // 显示响应                showResponseResult(response);// 一个私有方法，将响应结果显示出来            }            catch (Exception e)            {                e.printStackTrace();            }        }    };    private OnClickListener mPostClickListener = new View.OnClickListener()    {        @Override        public void onClick(View v)        {            Log.i(TAG, "POST request");            // 先获取用户名和年龄            String name = mNameText.getText().toString();            String age = mAgeText.getText().toString();            NameValuePair pair1 = new BasicNameValuePair("username", name);            NameValuePair pair2 = new BasicNameValuePair("age", age);            List<NameValuePair> pairList = new ArrayList<NameValuePair>();            pairList.add(pair1);            pairList.add(pair2);            try            {                HttpEntity requestHttpEntity = new UrlEncodedFormEntity(                        pairList);                // URL使用基本URL即可，其中不需要加参数                HttpPost httpPost = new HttpPost(baseURL);                // 将请求体内容加入请求中                httpPost.setEntity(requestHttpEntity);                // 需要客户端对象来发送请求                HttpClient httpClient = new DefaultHttpClient();                // 发送请求                HttpResponse response = httpClient.execute(httpPost);                // 显示响应                showResponseResult(response);            }            catch (Exception e)            {                e.printStackTrace();            }        }    };    /**     * 显示响应结果到命令行和TextView     * @param response     */    private void showResponseResult(HttpResponse response)    {        if (null == response)        {            return;        }        HttpEntity httpEntity = response.getEntity();        try        {            InputStream inputStream = httpEntity.getContent();            BufferedReader reader = new BufferedReader(new InputStreamReader(                    inputStream));            String result = "";            String line = "";            while (null != (line = reader.readLine()))            {                result += line;            }            System.out.println(result);            mResult.setText("Response Content from server: " + result);        }        catch (Exception e)        {            e.printStackTrace();        }    }}