post get请求的运用----android篇
GET是从服务器上获取数据，POST是向服务器传送数据。get，post在PHP网络编程中经常会运用到。
get post请求在Android如何运用呢？
GET是把参数数据队列加到提交表单的ACTION属性所指的URL中，值和表单内各个字段一一对应，在URL中可以看到。 POST是通过HTTP post机制，将表单内各个字段与其内容放置在HTML HEADER内一起传送到ACTION属性所指的URL地址。用户看不到这个过程
GET方式提交的数据最多只能是1024字节，理论上 POST没有限制，可传较大量的数据
GET安全性非常低， POST安全性较高。但是执行效率却比 POST方法好。
next，
下面分别用Post和 GET
方法来实现 Android
应用的 人员登入
，首先我们搭建一个服务器，这里我使用WAMP环境，以使用ThinkPHP框架为例。响应代码如下（response code）
code：
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<?php
namespace Home\Controller;
use Think\Controller;
class <a title="Android" href=" http://www.android-study.com/wangluobiancheng/628.html">Android</a>Controller extends Controller {
public function index()
{
//获取账号密码
$id=I('username');
$pwd=I('password');
$User=M('user');
//查询数据库
$data = $User->where("NAME='$id' AND PASSWORD='$pwd' ")->find();
//登入成功
if($data)
{
$response = array('success' => true,'msg'=>'登入成功');
$response=json_encode($response);
echo $response;//返回json格式
}
//登入失败
else
{
$response = array('success' => false,'msg'=>'账号或密码错误');
$response=json_encode($response);
echo $response;//返回json格式
}
}
}
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<uses-permission android:name="android.permission.INTERNET"></uses-permission>
Android的 网络请求主要使用java.net包中的HttpURLConnection类，服务器与 Android客户端数据交互格式为Json。
1.利用 POST请求方式来实现 人员登入。
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package com.dream.apm;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
public class MyActivity extends Activity {
//请求地址
private static String url=" http://10.0.2.2:8080/think/index.php/Home/<a title="Android" href=" http://www.android-study.com/wangluobiancheng/628.html">Android</a>";
public Button start;
public EditText username,password;
public URL http_url;
public String data;
public Handler handler;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//设置全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
//去除应用程序标题
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
//设置竖屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.main);
start=(Button)findViewById(R.id.start_one);
username=(EditText)findViewById(R.id.username);
password=(EditText)findViewById(R.id.password);
//消息处理器
handler=new Handler(Looper.getMainLooper())
{
@Override
public void handleMessage(Message msg)
{
super.handleMessage(msg);
switch(msg.what)
{
//登入成功
case 1:
Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
Toast.LENGTH_SHORT).show();
break;
//登入失败
case 2:
Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
Toast.LENGTH_SHORT).show();
break;
}
}
};
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//是否输入账号密码
if(username.getText().toString().length()>0&&password.getText().toString().length()>0){
//子线程可以获取UI的值，不能更改
new Thread(new Runnable() {
@Override
public void run() {
try {
http_url=new URL(url);
if(http_url!=null)
{
//打开一个HttpURLConnection连接
HttpURLConnection conn = (HttpURLConnection) http_url.openConnection();
conn.setConnectTimeout(5* 1000);//设置连接超时
conn.setRequestMethod("<a title="POST" href="http://www.android-study.com/wangluobiancheng/628.html">POST</a>");//以get方式发起请求
//允许输入输出流
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);//使用Post方式不能使用缓存
//获取账号密码
String params = "username=" + username.getText().toString()
+ "&password=" + password.getText().toString();
//设置请求体的类型是文本类型
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
//设置请求体的长度--字节长度
conn.setRequestProperty("Content-Length",String.valueOf(params.getBytes().length) );
//发送post参数
BufferedWriter bw=new BufferedWriter(newOutputStreamWriter(conn.getOutputStream()));
bw.write(params);
bw.close();
//接收服务器响应
if (conn.getResponseCode() == 200) {
InputStream is = conn.getInputStream();//得到网络返回的输入流
BufferedReader buf=new BufferedReader(newInputStreamReader(is));//转化为字符缓冲流
data=buf.readLine();
buf.close();is.close();
//判断登入结果
analyse(data);
}
}
} catch( Exception e) {
e.printStackTrace();
}
}
}).start();
}
else
{
Toast.makeText(MyActivity.this, "请完整输入账号密码",
Toast.LENGTH_SHORT).show();
}
}
});
}
public void analyse (String data)
{
System.out.println(data);
try {
JSONObject json_data=new JSONObject(data);
Boolean state=json_data.getBoolean("success");
String msg=json_data.getString("msg");
//登入成功
if(state)
{
//发送消息
Message message= new Message();
message.what=1;
Bundle temp = new Bundle();
temp.putString("msg",msg);
message.setData(temp);
handler.sendMessage(message);
}
//登入失败
else
{
Message message= new Message();
message.what=2;
Bundle temp = new Bundle();
temp.putString("msg",msg);
message.setData(temp);
handler.sendMessage(message);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
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2.利用GET请求方式来实现人员登入
?
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package com.dream.apm;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
public class MyActivity extends Activity {
public Button start;
public EditText username,password;
public URL http_url;
public String data;
public Handler handler;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//设置全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
//去除应用程序标题
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
//设置竖屏
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.main);
start=(Button)findViewById(R.id.start_one);
username=(EditText)findViewById(R.id.username);
password=(EditText)findViewById(R.id.password);
//消息处理器
handler=new Handler(Looper.getMainLooper())
{
@Override
public void handleMessage(Message msg)
{
super.handleMessage(msg);
switch(msg.what)
{
//登入成功
case 1:
Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
Toast.LENGTH_SHORT).show();
break;
//登入失败
case 2:
Toast.makeText(MyActivity.this, msg.getData().getString("msg"),
Toast.LENGTH_SHORT).show();
break;
}
}
};
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//是否输入账号密码
if(username.getText().toString().length()>0&&password.getText().toString().length()>0){
//子线程可以获取UI的值，不能更改
new Thread(new Runnable() {
@Override
public void run() {
try {
//请求地址--
String url=" http://10.0.2.2:8080/think/index.php/Home/<a title="Android" href=" http://www.android-study.com/wangluobiancheng/628.html">Android</a>?"+"username=" + URLEncoder.encode(username.getText().toString(), "UTF-8")
+ "&password=" + URLEncoder.encode(password.getText().toString(), "UTF-8");
http_url=new URL(url);
if(http_url!=null)
{
//打开一个HttpURLConnection连接
HttpURLConnection conn = (HttpURLConnection) http_url.openConnection();
conn.setConnectTimeout(5* 1000);//设置连接超时
conn.setRequestMethod("<a title="GET" href="http://www.android-study.com/wangluobiancheng/628.html">GET</a>");//以get方式发起请求
//允许输入流
conn.setDoInput(true);
//接收服务器响应
if (conn.getResponseCode() == 200) {
InputStream is = conn.getInputStream();//得到网络返回的输入流
BufferedReader buf=new BufferedReader(newInputStreamReader(is));//转化为字符缓冲流
data=buf.readLine();
buf.close();is.close();
//判断登入结果
analyse(data);
}
}
} catch( Exception e) {
e.printStackTrace();
}
}
}).start();
}
else
{
Toast.makeText(MyActivity.this, "请完整输入账号密码",
Toast.LENGTH_SHORT).show();
}
}
});
}
public void analyse (String data)
{
System.out.println(data);
try {
JSONObject json_data=new JSONObject(data);
Boolean state=json_data.getBoolean("success");
String msg=json_data.getString("msg");
//登入成功
if(state)
{
//发送消息
Message message= new Message();
message.what=1;
Bundle temp = new Bundle();
temp.putString("msg",msg);
message.setData(temp);
handler.sendMessage(message);
}
//登入失败
else
{
Message message= new Message();
message.what=2;
Bundle temp = new Bundle();
temp.putString("msg",msg);
message.setData(temp);
handler.sendMessage(message);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
} 可以看到界面啦 |
OK，adiOS