Android 通过Get/Post提交请求数据到服务器

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package com.lifengfeng.submitdata.utils;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.net.URLEncoder;

import android.util.Log;

public class NetUtils {

    private static final String TAG = "NetUtils";

    /**

     * 使用post的方式登录

     * @param userName

     * @param password

     * @return

     */

    public static String loginOfPost(String userName, String password) {

        HttpURLConnection conn = null;

        try {

            URL url = new URL("http://10.0.2.2:8080/Server/servlet/LoginServlet");

            conn = (HttpURLConnection) url.openConnection();

            conn.setRequestMethod("POST");

            conn.setConnectTimeout(10000); // 连接的超时时间

            conn.setReadTimeout(5000); // 读数据的超时时间

            conn.setDoOutput(true); // 必须设置此方法, 允许输出

//          conn.setRequestProperty("Content-Length", 234);     // 设置请求头消息, 可以设置多个

            // post请求的参数

            String data = "username=" + userName + "&password=" + password;

            // 获得一个输出流, 用于向服务器写数据, 默认情况下, 系统不允许向服务器输出内容

            OutputStream out = conn.getOutputStream(); 

            out.write(data.getBytes());

            out.flush();

            out.close();

            int responseCode = conn.getResponseCode();

            if(responseCode == 200) {

                InputStream is = conn.getInputStream();

                String state = getStringFromInputStream(is);

                return state;

            } else {

                Log.i(TAG, "访问失败: " + responseCode);

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            if(conn != null) {

                conn.disconnect();

            }

        }

        return null;

    }

    /**

     * 使用get的方式登录

     * @param userName

     * @param password

     * @return 登录的状态

     */

    public static String loginOfGet(String userName, String password) {

        HttpURLConnection conn = null;

        try {

            String data = "username=" + URLEncoder.encode(userName) + "&password=" + URLEncoder.encode(password);

            URL url = new URL("http://10.0.2.2:8080/Server/servlet/LoginServlet?" + data);

            conn = (HttpURLConnection) url.openConnection();

            conn.setRequestMethod("GET");       // get或者post必须得全大写

            conn.setConnectTimeout(10000); // 连接的超时时间

            conn.setReadTimeout(5000); // 读数据的超时时间

            int responseCode = conn.getResponseCode();

            if(responseCode == 200) {

                InputStream is = conn.getInputStream();

                String state = getStringFromInputStream(is);

                return state;

            } else {

                Log.i(TAG, "访问失败: " + responseCode);

            }

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            if(conn != null) {

                conn.disconnect();      // 关闭连接

            }

        }

        return null;

    }

    /**

     * 根据流返回一个字符串信息

     * @param is

     * @return

     * @throws IOException

     */

    private static String getStringFromInputStream(InputStream is) throws IOException {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        byte[] buffer = new byte[1024];

        int len = -1;

        while((len = is.read(buffer)) != -1) {

            baos.write(buffer, 0, len);

        }

        is.close();

        String html = baos.toString();  // 把流中的数据转换成字符串, 采用的编码是: utf-8

//      String html = new String(baos.toByteArray(), "GBK");

        baos.close();

        return html;

    }

}