HTTP get、post请求与post文件发生

一件醉了的事：1、要写访问网络的权限（<uses-permission android:name="android.permission.INTERNET" >
    </uses-permission>）  2、必须在分线程里访问  

一、get post请求步骤

      1、使用URL的openConnection（）方法来创建URLConnection对象

            URL url=new URL(xxx);

            URLConnnection conn=url.openConnection();

     2、设置URLConnection的参数和普通请求属性

            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent","Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36");

     3、建立连接

           xxxxxx

     4、访问远程资源，获取信息

            in=new BufferedReader(new InputStreamReader(conn.getInputStream()));

            String line;

            while((line=in.readLie())!=null){ result+="\n"+line;}

二、get post请求的书写的区别

     1、获得URL时，get方法已包含请求参数（new URL（url+“？”+参数））；而post只是单纯的url（new URL（url））

     2、建立连接时，get方法直接使用conn.connect()建立连接；而post先设置两个值{conn.setDoOutput(true); conn.setDoInput(true)},然后获取输出流out=new                                              PrintWriter（conn.getOutputstream()）,发送请求参数  out.print(参数)；设置缓冲 out.flush();

三、URL网络文件读取

    1、定义URL对象  URL url=new URL（“http://www....”）；

    2、打开输入流  Inputstream is=url.openStream();

四、get post请求代码 五、post文件发送

package com.wl.httptest;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import com.wl.httptest.interfaces.NetworkInsterface;

import android.util.Log;

/**
 * 为HttpFactory提供支持，访问网络，返回收到的信息
 * 
 * @author 王琳
 */
public class HttpBase {
	// userAgent
	private static String userAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36";
	private static URLConnection conn;
	private static PrintWriter out;
	private static BufferedOutputStream outs;
	private static BufferedReader in;
	private static String tag = "HttpBase";

	/**
	 * @param strUrl
	 *            请求地址
	 * @param params
	 *            包含请求参数的字符串
	 * @param method
	 *            请求的类型
	 * @return
	 */
	public static String net(String strUrl, String params, String method) {
		String data = null;
		// ======【区别1】
		if (method.toLowerCase().equals("get")) {
			strUrl = strUrl + "?" + params;
		}
		// ==================
		try {
			URL url = new URL(strUrl);
			conn = url.openConnection();
			// 设置参数和普通请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", userAgent);
			// ======【区别2】
			if (method.toLowerCase().equals("get")) {
				conn.connect();
			} else {
				conn.setDoInput(true);
				conn.setDoOutput(true);
				out = new PrintWriter(conn.getOutputStream());
				out.print(params);
				out.flush();// 缓冲
			}
			// ==================
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				data += line;
			}
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			data = "访问异常！" + e.getMessage();
			Log.e(tag, "URL异常：" + e.getMessage());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			data = "访问异常！" + e.getMessage();
			Log.e(tag, "IO异常： " + e.getMessage());
		} finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
				;
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				Log.e(tag, "流关闭异常：" + e.getMessage());
			}
		}

		return data;
	}

	public static String net(String strUrl, String path) {
		String data = null;
		try {
			URL url = new URL(strUrl);
			conn = url.openConnection();
			// 设置参数和普通请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", userAgent);
			conn.setDoInput(true);
			conn.setDoOutput(true);
			// ==========【post发送文件流】============
			outs = new BufferedOutputStream(conn.getOutputStream());
			File file = new File(path);
			FileInputStream fis = new FileInputStream(file);
			byte[] buff = new byte[(int) file.length()];
			int len;
			while ((len = fis.read(buff)) != -1) {

				outs.write(buff, 0, len);
			}
			// ====================================
			outs.flush();// 缓冲
			in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				data += line;
			}
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			data = "访问异常！" + e.getMessage();
			Log.e(tag, "URL异常：" + e.getMessage());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			data = "访问异常！" + e.getMessage();
			Log.e(tag, "IO异常： " + e.getMessage());
		} finally {
			try {
				if (outs != null) {
					outs.close();
				}
				if (in != null) {
					in.close();
				}
				;
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				Log.e(tag, "流关闭异常：" + e.getMessage());
			}
		}

		return data;
	}

}

六、get请求的简写

/**
	 * 根据URL地址获得数据
	 */
	
	public void getNetwork(final String url, final NetworkInsterface insterface) {
		new Thread() {
			public void run() {
				InputStream is = null;
				try {
					URL urlw = new URL(url);
					// URLConnection conn = urlw.openConnection();
					// is = conn.getInputStream();
					is = urlw.openStream();
					insterface.OnSuccess(is);
				} catch (MalformedURLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					Log.e("========", e.getMessage());
					insterface.OnFaiure("错了" + e.getMessage());
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
					Log.e("========", e.getMessage());
					insterface.OnFaiure("错了" + e.getMessage());
				}

			};
		}.start();
	}