android使用url connection示例(get和post数据获取返回数据)

<uses-permission android:name="android.permission.internet" />
<uses-permission android:name="android.permission.write_external_storage" />
<uses-permission android:name="android.permission.read_external_storage"/>

package com.act262.whpj.utils;

import java.io.bufferedreader;
import java.io.file;
import java.io.filewriter;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.io.printstream;
import java.io.printwriter;
import java.net.malformedurlexception;
import java.net.url;
import java.net.urlconnection;
import java.util.date;

import android.os.environment;
import android.util.printstreamprinter;

/**
 * 用于get或者post数据
 */
public class getpostutil {
    public static final string tag = "getpostutil debug";

    /**
     * @param url
     *            传入的url,包括了查询参数
     * @return 返回get后的数据
     */
    public static string sendget(string url) {
        string result = "";
        // string
        url realurl = null;
        urlconnection conn = null;
        bufferedreader bufreader = null;
        string line = "";
        try {
            realurl = new url(url);
        } catch (malformedurlexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
            system.out.println("url 格式错误");
        }

        try {
            conn = realurl.openconnection();
            // 设置连接参数...conn.setrequestproperty("xx", "xx");

            conn.setconnecttimeout(10000); // 10s timeout
            // conn.setrequestproperty("accept", "*/*");
            // conn.setrequestproperty("", "");

            conn.connect(); // 连接就把参数送出去了 get方法

        } catch (ioexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
            system.out.println("连接错误");
        }

        try {
            bufreader = new bufferedreader(new inputstreamreader(
                    conn.getinputstream(), "gb2312"));

            while ((line = bufreader.readline()) != null) {
                result += line + "\n";
            }
        } catch (ioexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
            system.out.println("读取数据错误");
        } finally {
            // 释放资源
            if (bufreader != null) {
                try {
                    bufreader.close();
                } catch (ioexception e) {
                    // todo auto-generated catch block
                    e.printstacktrace();
                }
            }
        }

        return result;
    }

    /**
     * @param url
     * @param param
     *            查询参数 ,形式如 name=xx&age=xx&sex=xx
     * @return
     */
    public static string sendget(string url, string param) {
        return sendget(url + "?" + param);
    }

    /**
     * @param url
     *            指定的url,不包括查询参数
     * @param param
     *            查询参数 形式如 name=xx&age=xx&sex=xx
     * @return 返回post后的数据
     */
    public static string sendpost(string url, string param) {
        string result = "";
        url realurl = null;
        bufferedreader bufreader = null;
        // printwriter printwriter = null;
        printstreamprinter out = null;
        urlconnection connection = null;
        string line = "";
        try {
            realurl = new url(url);
        } catch (malformedurlexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
        }
        try {
            connection = realurl.openconnection();
            // 设置为可输入输出 post的模式,而且在输出之前不能获取输入的数据,否则报错
            connection.setdooutput(true);
            connection.setdooutput(true);

            // 已经连接了,所以不能再用connect(),否则报错的

            out = new printstreamprinter(new printstream(
                    connection.getoutputstream()));
            out.println(param);
            //
        } catch (ioexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
        }

        try {
            bufreader = new bufferedreader(new inputstreamreader(
                    connection.getinputstream(), "gb2312"));
            while ((line = bufreader.readline()) != null) {
                result += line + "\n";
            }
        } catch (ioexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
        } finally {
            // 释放资源
            try {
                if (bufreader != null) {
                    bufreader.close();
                }
                if (out != null) {
                    //
                }
            } catch (ioexception e2) {
                // todo: handle exception
            }

        }
        return result;
    }

    public static void savefile(string content) {

        file file = new file(environment.getexternalstoragedirectory()
                .getabsolutepath(), "file.html");
        if (!file.exists()) {
            try {
                boolean status = file.createnewfile();

                system.out.println("is create new file :" + status);
            } catch (ioexception e) {
                // todo auto-generated catch block
                e.printstacktrace();
            }
        }
        printwriter pw = null;
        try {
            filewriter fw = new filewriter(file);
            // pw = new printwriter(new date() + ".html");
            // pw.println(content);

            fw.write(content);
            fw.flush();

        } catch (ioexception e) {
            // todo auto-generated catch block
            e.printstacktrace();
            if (pw != null) {
                pw.close();
            }
        }
    }

}

package com.act262.whpj.ui;

import android.app.activity;
import android.os.bundle;
import android.os.handler;
import android.os.message;
import android.util.log;
import android.view.menu;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.textview;

import com.act262.whpj.r;
import com.act262.whpj.utils.getpostutil;

public class startactivity extends activity {

    button get, post;
    textview showtextview;
    handler handler;
    string result = null;

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_start);
        get = (button) findviewbyid(r.id.get);
        post = (button) findviewbyid(r.id.post);
        showtextview = (textview) findviewbyid(r.id.show);
        handler = new handler() {
            public void handlemessage(message msg) {
                if (msg.what == 0x123) {
                    showtextview.settext(result);
                }
            }
        };
        post.setonclicklistener(new buttonlistener());
        get.setonclicklistener(new buttonlistener());
    }

    @override
    public boolean oncreateoptionsmenu(menu menu) {
        // inflate the menu; this adds items to the action bar if it is present.
        getmenuinflater().inflate(r.menu.start, menu);
        return true;
    }

    class buttonlistener implements onclicklistener {

        @override
        public void onclick(view v) {
            switch (v.getid()) {
            case r.id.get:

                new thread() {

                    public void run() {
                        result = getpostutil
                                .sendget("http://www.baidu.com");
                        handler.sendemptymessage(0x123);// 通知ui线程更新界面
                        // log.d(getpostutil.tag, result);
                        system.out.println(result);
                        getpostutil.savefile(result);
                    }
                }.start();
                showtextview.settext(result);
                break;
            case r.id.post:
                new thread() {
                    public void run() {
                        result = getpostutil
                                .sendpost(
                                        "http://www.baidu.com",
                                        "null");
                        handler.sendemptymessage(0x123);// 通知ui线程更新界面
                        log.d(getpostutil.tag, result);
                    }
                }.start();
                showtextview.settext(result);
                break;
            default:
                break;
            }
        }
    }
}