赵雅智_android http get请求

  <!-- 添加网络访问权限 -->
    <uses-permission android:name="android.permission.INTERNET"/>

布局文件 activity_login.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/username"
        android:layout_width="wrap_content"
		android:layout_height="wrap_content" 
		android:textSize="20sp"
		android:layout_alignBaseline="@+id/editusername"
		android:text="@string/username"/>
    
    <EditText
        android:id="@+id/editusername"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/username"
        android:hint="@string/edit_username"
        />
    	
        <TextView
        android:id="@+id/password"
        android:layout_width="wrap_content"
		android:layout_height="wrap_content" 
		android:textSize="20sp"
		android:layout_below="@+id/username"
		android:layout_alignBaseline="@+id/editpass"
		android:text="@string/password"/>
    
    <EditText
        android:id="@+id/editpass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_toRightOf="@+id/password"
        android:layout_below="@+id/editusername"
        android:hint="@string/edit_password"
        />

    <Button
        android:id="@+id/btn_login"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="80dp"
        android:layout_below="@+id/password" 
        android:layout_marginLeft="50dp"
        android:text="@string/btn_sure"
        android:onClick="login"
        />
    
    <CheckBox 
        android:id="@+id/checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50dp"
        android:layout_alignBaseline="@+id/btn_login"
        android:layout_below="@+id/editpass"
        android:layout_toRightOf="@+id/btn_login"
       	android:text="@string/checkbox"
       	/>
    
    <TextView
        android:id="@+id/tv_result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="@string/tip_result"/>
</RelativeLayout> 

String.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">lesson03</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>

    <string name="username">用户名</string>
	<string name="password">密    码</string>   
	<string name="edit_username">请输入用户名</string>
	<string name="edit_password">请输入密码</string>
 	<string name="btn_sure">确定</string>
    <string name="checkbox">是否记住密码</string>
    
    <string name="tip_result">服务器返回的数据</string>
</resources>

流转字符工具类 StreamTools.java

package com.example.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamTools {
/**
 * 把流轉換成字符串
 * @param is
 * @return
 */
	public static String streamToStr(InputStream is){
		
		try {
			// 字节的输出流
			ByteArrayOutputStream os = new ByteArrayOutputStream();
			// 定义读取长度
			int len = 0;
			// 定义缓冲区
			byte buffer[] = new byte[1024];
			// 从输入流中读取，并写入os对象中
			while ((len = is.read(buffer)) != -1) {
				os.write(buffer, 0, len);
			}
			// 关闭流
			is.close();
			os.close();
			// 写到字节流
			return new String(os.toByteArray());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
	}
}

Activity类 LoginActivity.java

package com.example.android_http;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.example.util.StreamTools;

public class LoginActivity extends Activity {
	private EditText et_username;
	private EditText et_password;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_login);
		findView();

	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.login, menu);
		return true;
	}

	public void findView() {
		et_password = (EditText) findViewById(R.id.editpass);
		et_username = (EditText) findViewById(R.id.editusername);
	}

	public void login(View v) {
		// 获取点击控件的id
		int id = v.getId();
		// 根据id进行判断
		switch (id) {
		case R.id.btn_login:// 进行登录操作
			// Toast.makeText(getApplicationContext(), "--", 0).show();
			// 获取用户名密码
			final String userName = et_username.getText().toString();
			final String userPass = et_password.getText().toString();

			// 判断是否为空
			if (TextUtils.isEmpty(userName) || TextUtils.isEmpty(userPass)) {
				Toast.makeText(getApplicationContext(), "用户名或者密码不能为空", 0)
						.show();
			} else {
				Toast.makeText(getApplicationContext(), "發送請求道服務器", 0)
				.show();
				// 访问网络（需要一个网络的权限）
				// 访问网络（好事操作）子线程，避免阻塞主线程UI
				// http://172.16.237.200:8080/video/login.do?username=chj&userpass=123

				// 所有耗時操作都要在子線程中
				new Thread() {
					public void run() {
						try {
							// 请求地址
							String spec = "http://172.16.237.200:8080/video/login.do?username="
									+ userName + "&userpass=" + userPass;
							// 根据地址创建URL对象（网络访问url）
							URL url = new URL(spec);
							// 采用http协议打开的连接对象
							HttpURLConnection urlConnection = (HttpURLConnection) url
									.openConnection();
							urlConnection.setRequestMethod("GET");// 以get方式发起请求
							urlConnection.setReadTimeout(5000);// 设置超时
							urlConnection.setConnectTimeout(5000);// 设置连接超时
							urlConnection
									.setRequestProperty("User-Agent",
											"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0");
							// 获取相应的 code 400 200 505 302
							if (urlConnection.getResponseCode() == 200) {
								// 得到网络返回的输入流
								InputStream is = urlConnection.getInputStream();
								String result = StreamTools.streamToStr(is);
								
								System.out.println("返回的数据是：" + result);
							} else {
								System.out.println("请求url失败");
							}

						} catch (Exception e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					};
				}.start();

			}
			break;

		default:
			break;
		}
	}
}

原文：http://blog.csdn.net/zhaoyazhi2129/article/details/26509763