HttpClient操作cookie简略示例 - AsyncTask异步形式详解及其使...- listview的运用

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▪HttpClient操作cookie简略示例 HttpClient操作cookie简单示例 package org.sunnysolong.net; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.I.........

▪ AsyncTask异步形式详解及其使用 AsyncTask异步方式详解及其使用查看官方的解释： AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads an.........

▪ listview的运用 listview的使用在Android开发中经常会需要用的列表，你可以用ListActivity，或者ListView，甚至其他方法。用ListView相对来说更灵活。下边是ListView简单实现代码：显示java文件： import java.util.Arr.........

[1]HttpClient操作cookie简略示例

来源: 互联网发布时间: 2014-02-18

HttpClient操作cookie简单示例

package org.sunnysolong.net;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import org.apache.commons.httpclient.Cookie;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.HttpException;

import org.apache.commons.httpclient.HttpStatus;

import org.apache.commons.httpclient.NameValuePair;

import org.apache.commons.httpclient.methods.GetMethod;

/**

* Wap登录返回测试

* Title: JavaTech<br>

* Description: <br>

* Create DateTime: Nov 14, 2011 8:55:24 PM <br>

* @author wangmeng

public class WapQuery {

private static String URL_LINK = "http://192.168.1.147/t3/wap/index.php";

// http://192.168.1.147/t3/wap/index.php?mod=topic&code=myhome

// 转向URL：http://192.168.1.147:80/t3/wap/index.php

private static final HttpClient HTTP_CLIENT = new HttpClient();

private static Cookie[] cookies;

private static GetMethod login;

private static GetMethod home;

/**

* 输入流转换成字符串

* @param is: 输入流

* @return 字符串对象

private static String InputStreamToString(InputStream is){

BufferedReader reader = null;

StringBuffer responseText = null;

String readerText = null;

try {

reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

responseText = new StringBuffer();

readerText = reader.readLine();

while(readerText != null){

responseText.append(readerText);

responseText.append(System.getProperty("line.separator"));

readerText = reader.readLine();

}

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return responseText.toString();

}

/**

* 将cookie写入指定文件

* @param cookies: cookie

* @param fileName: 文件名

private static void write(Cookie[] cookies, String fileName){

try {

String path = System.getProperty("user.home") + "\\" + fileName;

File file = new File(path);

BufferedWriter bw = new BufferedWriter(new FileWriter(file));

for(Cookie c : cookies){

bw.append(c.toString());

bw.append(System.getProperty("line.separator"));

}

bw.flush();

bw.close();

Runtime.getRuntime().exec("explorer " + path + "");

} catch (IOException e) {

e.printStackTrace();

}

/**

* 登录

private static void login(){

try {

//指定链接设定请求方式

//入参

NameValuePair mod = new NameValuePair("mod", "login");

NameValuePair code = new NameValuePair("code", "dologin");

NameValuePair username = new NameValuePair("username", URLEncoder.encode("wangli@qq.com", "UTF-8"));

NameValuePair password = new NameValuePair("password", URLEncoder.encode("123456", "UTF-8"));

NameValuePair iswap = new NameValuePair("iswap", "1");

NameValuePair cityID = new NameValuePair("cityID", URLEncoder.encode("755", "UTF-8"));

NameValuePair city = new NameValuePair("city", URLEncoder.encode("深圳", "UTF-8"));

NameValuePair[] params = new NameValuePair[]{mod, code, username, password, iswap, cityID, city};

//设参

//禁用重定向

//执行请求并返回状态码

int statusCode = HTTP_CLIENT.executeMethod(login);

//转向URL：http://192.168.1.147:80/t3/wap/index.php

if (statusCode != HttpStatus.SC_OK) {

System.err.println("LOGIN_ERROR >>> " + login.getStatusLine());

}

System.out.println("LOGIN_RESPONSE >>>" + InputStreamToString(login.getResponseBodyAsStream()));

//设定全局cookie

cookies = HTTP_CLIENT.getState().getCookies();

//记录cookie

write(cookies, "login-cookie.txt");

} catch (UnsupportedEncodingException e) {

System.err.println("(LOGIN) " + e.getMessage());

} catch (HttpException e) {

System.err.println("(LOGIN) " + e.getMessage());

e.printStackTrace();

} catch (IOException e) {

System.err.println("(LOGIN) " + e.getMessage());

} finally{

//释放连接

}

/**

* 主页

private static void home(){

try {

//指定链接设定请求方式

home = new GetMethod(URL_LINK);

//入参、设参

home.setQueryString("mod=topic&code=myhome");

//记录cookie

write(HTTP_CLIENT.getState().getCookies(), "home-cookie.txt");

//添加cookie

HTTP_CLIENT.getState().addCookies(cookies);

//执行请求并返回状态码

int statusCode = HTTP_CLIENT.executeMethod(home);

if (statusCode != HttpStatus.SC_OK) {

System.err.println("HOME_ERROR >>>" + home.getStatusLine());

}

//再次记录cookie

write(HTTP_CLIENT.getState().getCookies(), "access-cookie.txt");

System.out.println("HOME_RESPONSE >>>" + InputStreamToString(home.getResponseBodyAsStream()));

} catch (HttpException e) {

System.err.println("(HOME) " + e.getMessage());

} catch (IOException e) {

System.err.println("(HOME) " + e.getMessage());

} finally {

home.releaseConnection();

}

public static void main(String[] args) {

//登录

//转向主页

home();

/**

* 说明：查看login-cookie.txt和home-cookie.txt中记录的cookie是否完全一致，是则表示会话信息保留完整。

* access-cookie.txt中记录的是第二次请求返回的cookie，用来与全局记录的cookie做信息对比。

}

[2] AsyncTask异步形式详解及其使用

来源: 互联网发布时间: 2014-02-18

AsyncTask异步方式详解及其使用

查看官方的解释：

AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.

An asynchronous task is defined by a computation that runs on a background thread and whose result is published on the UI thread. An asynchronous task is defined by 3 generic types, called Params, Progressand Result, and 4 steps, called begin, doInBackground, processProgress and end.

Usage:

AsyncTask 是abstract class必须被子类继承使用。至少要重写一个方法：(doInBackground(Params...)), 经常还要重写另一个方法：(onPostExecute(Result).)

demo：

写道

private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
int count = urls.length;
long totalSize = 0;
for (int i = 0; i < count; i++) {
totalSize += Downloader.downloadFile(urls[i]);
publishProgress((int) ((i / (float) count) * 100));
}
return totalSize;
}

protected void onProgressUpdate(Integer... progress) {
setProgressPercent(progress[0]);
}

protected void onPostExecute(Long result) {
showDialog("Downloaded " + result + " bytes");
}
}

创建后，使用起来，非常简单：

 new DownloadFilesTask().execute(url1, url2, url3);

在网上搜了一下，这篇文章讲解的不错。

http://blog.csdn.net/zuolongsnail/article/details/6394055

[3] listview的运用

来源: 互联网发布时间: 2014-02-18

listview的使用
在Android开发中经常会需要用的列表，你可以用ListActivity，或者ListView，甚至其他方法。
用ListView相对来说更灵活。下边是ListView简单实现代码：
显示java文件：
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;
public class aGirlGallery extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 绑定Layout里面的ListView
ListView list = (ListView) findViewById(R.id.lv);
// 生成动态数组，加入数据
ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();
for (int i = 0; i < 10; i++) {
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("ItemImage", R.drawable.icon);// 图像资源的ID
map.put("ItemTitle", "Level " + i);
listItem.add(map);
}
// 生成适配器的Item和动态数组对应的元素
SimpleAdapter listItemAdapter = new SimpleAdapter(this, listItem,// 数据源
R.layout.list_items,// ListItem的XML实现
// 动态数组与ImageItem对应的子项
new String[] { "ItemImage", "ItemTitle" },
// list_items中对应的的ImageView和TextView
new int[] { R.id.ItemImage, R.id.ItemTitle });
// 绑定数据源
list.setAdapter(listItemAdapter);
// 点击事件
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView< ?> arg0, View arg1, int position,
long id) {
//do something?
}
});
// 长按事件
list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
//do something?
}
});
}
// 长按菜单响应函数
@Override
public boolean onContextItemSelected(MenuItem item) {
//do something?
return super.onContextItemSelected(item);
}
}

然后是main.xml：

< ?xml version="1.0" encoding="utf-8"?><linearlayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <listview android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lv" /></linearlayout>

list_items.xml:

< ?xml version="1.0" encoding="utf-8"?><relativelayout android:id="@+id/RelativeLayout01" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:paddingLeft="10dip" android:paddingRight="10dip"> <imageview android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ItemImage" /> <textview android:layout_toRightOf="@id/ItemImage" android:paddingTop="10dip" android:layout_height="wrap_content" android:textSize="18dip" android:layout_width="fill_parent" android:id="@+id/ItemTitle" /></relativelayout>