Android中的Http通信

android 和服务器通信，通常有post 和get 方法。这里写了一个小案例，模拟手机注册账户，把name和age信息提交到服务器。由于在UI线程不能做联网操作，我们自定义一个线程类HttpThread继承Thread

package com.example.registeractivity;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;public class PostThread extends Thread {    String url;    String name;    String age;    public PostThread(String url, String name, String age) {        super();        this.url = url;        this.name = name;        this.age = age;    }    @Override    public void run() {//      doGet();        doPost();        super.run();    }        private void doHttpClientPost() {        String urlPostfix = "name="+name+"&age="+age;        HttpPost post = new HttpPost(url);        HttpClient client = new DefaultHttpClient();        ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();        params.add(new BasicNameValuePair("name", name));        params.add(new BasicNameValuePair("age", age));        try {            post.setEntity(new UrlEncodedFormEntity(params));            HttpResponse response = client.execute(post);            HttpEntity entity = response.getEntity();            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                Log.w("POST", "post OK  "+response.toString());            }            String content = EntityUtils.toString(entity);            Log.w("content:", content);        } catch (ClientProtocolException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    private void doHttpClientGet() {        url = url+ "?name="+name+"&age="+age;        HttpGet get = new HttpGet(url);        HttpClient client = new DefaultHttpClient();        try {            HttpResponse response = client.execute(get);            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {                //如果状态为200，                HttpEntity entity = response.getEntity();                String content = EntityUtils.toString(entity);                System.out.println(content);            }        } catch (ClientProtocolException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    //GET方式    private void doGet() {        url = url+ "?name="+name+"&age="+age;        try {            URL httpUrl = new URL(url);            HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();            conn.setRequestMethod("GET");            conn.setReadTimeout(5000);//設置5秒超時            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));            StringBuffer sb = new StringBuffer();            String line;            while ((line = br.readLine()) != null) {                sb.append(line);            }            System.out.println("result:"+sb.toString());        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }           }    //POST方式    private void doPost() {        String urlPostfix = "name="+name+"&age="+age;        try {            URL httpUrl = new URL(url);            HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();            conn.setRequestMethod("POST");            conn.setReadTimeout(5000);//設置5秒超時            OutputStream out = conn.getOutputStream();            out.write(urlPostfix.getBytes());            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));            StringBuffer sb = new StringBuffer();            String line;            while ((line = br.readLine()) != null) {                sb.append(line);            }            System.out.println("result:"+sb.toString());        } catch (Exception e) {            e.printStackTrace();        }           }}

线程定义好，看看布局，两个输入框，一个按钮，点击提交

<RelativeLayout 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:padding="16dp"    tools:context="com.example.registeractivity.MainActivity" >    <LinearLayout        android:id="@+id/ll1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="20dp"            android:gravity="center_vertical"        android:orientation="horizontal" >        <TextView            android:id="@+id/tv_name"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:gravity="center_vertical"            android:text="姓名" />        <EditText            android:id="@+id/et_name"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:gravity="center_vertical"            android:layout_alignParentTop="true"            android:layout_toRightOf="@id/tv_name"            android:layout_weight="5"            android:ems="10"            android:hint="请输入姓名" />    </LinearLayout>    <LinearLayout        android:id="@+id/ll2"            android:layout_marginTop="20dp"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/ll1"        android:orientation="horizontal" >        <TextView            android:text="年龄"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_below="@+id/tv_age"            android:gravity="center_vertical"            android:layout_weight="1" />        <EditText            android:id="@+id/et_age"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:gravity="center_vertical"            android:layout_toRightOf="@id/tv_age"            android:layout_weight="5"            android:ems="10"             android:hint="请输入年龄"/>    </LinearLayout>    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/bt_submit"        android:layout_below="@id/ll2"        android:layout_alignParentRight="true"        android:text="提交"        /></RelativeLayout>

效果是这样的

然后在activity里初始化视图，给按键添加监听：

package com.example.registeractivity;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;public class MainActivity extends Activity {    private EditText mEtName;    private EditText mEtAge;    private Button mBtSubmit;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    //http://localhost:8080/web/MyServlet?name=laxian&age=2011    private void initView() {        mEtName = (EditText) findViewById(R.id.et_name);        mEtAge = (EditText) findViewById(R.id.et_age);        mBtSubmit = (Button) findViewById(R.id.bt_submit);        mBtSubmit.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                //本机开的服务器，ip地址可以通过dos命令：ipconfig 查看                String url = "http://192.168.31.126:8080/web/MyServlet";                HttpThread thread = new HttpThread(url, mEtName.getText().toString(), mEtAge.getText().toString());                thread.start();;            }        });    }}

服务器呢，如果装有tomcat，新建一个dynamic web project，名叫loginServer新建一个login.jsp文件，添加一个表单，测试一下，以备手机端访问使用

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body>    <form action="MyServlet" method="get">        name:<input type="text" name="name"><br>        age:<input type="text" name="age"><br>        submit:<input type="submit" value="submit"><br>    </form></body></html>

，同时新建一个servlet，重写doPost()和doGet()方法。

    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        doPost(request, response);    }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        String name = request.getParameter("name");        String age = request.getParameter("age");        response.setContentType("text/html;charset=utf-8");        PrintWriter out = response.getWriter();        out.println("name: "+new String(name.getBytes("iso-8859-1"),"utf-8")+" age: "+age);        System.out.println("name: "+new String(name.getBytes("iso-8859-1"),"utf-8")+" age: " +" age: "+age);    }

然后启动服务loginServer，右键，run on server
再然后，运行App，测试

这就成功了，
GET和POST方法结果一样。
代码下载