原创： httpclient 4.0 使用 - 访问开心网的各种组件 例子

    在网上查了好长时间，发现httpclient的例子都是讲httpclient 3.X的。httpclient 4.0的例子简直是凤毛麟角。只好自己上官网仔细了查了下文档和官网示例，受益匪浅啊！
    由于前段时间对“开心网”的“开心大亨”很感兴趣，但是每隔一段时间就需要看一下最新的价格变化，很是麻烦，由于我就想起用httpclient写个程序，自动查看最新的价格，并和前次的价格做比较，好让我可以选择利润最大的进行投资。
   
    程序用到的包如下，为了附件的瘦身，请大家自己下载啊，附件中是没有这些lib的啊。
    commons-collections-3.2.1.jar
    commons-configuration-1.6.jar
    commons-io-1.4.jar
    commons-lang-2.4.jar
    commons-logging-1.1.1.jar
    httpclient-4.0.jar
    httpcore-4.0.1.jar

    由于只是例子，而且httpclient4.0的结构变化很大，自己对其理解也不是很深，此程序只是个入门程序，如果有高手在的话，希望大家可以提出宝贵的意见。
    程序写的不是很美观，但意在让大家明白如何简单的使用httpclient4.0，所以没有对程序做任何的重构的整理，望大家多多谅解啊。

    程序代码如下：
   
    主程序： KaiXin001.java

/*
 * 2009/12/21
 * Author:  Yuan Hongzhi 
 */
import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.cookie.Cookie;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

public class KaiXin001 {

  public InputStream getResourceAsStream(String filename) throws Exception {
    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

    InputStream in = null;
    if (classLoader != null) {
      in = classLoader.getResourceAsStream(filename);
    }
    if (in == null) {
      in = ClassLoader.getSystemResourceAsStream(filename);
    }
    if (in == null) {
      throw new Exception("Can't find resource file: " + filename);
    } else {
      return in;
    }
  }

  public void writeToFile(String file, HttpEntity entity) throws Exception {
    writeToFile(file, EntityUtils.toString(entity));
  }

  public void writeToFile(String file, String data) throws Exception {
    FileUtils.writeStringToFile(new File(file), data, "UTF-8");
  }

  public String getContent(HttpEntity entity) throws Exception {
    if (entity != null) {
      entity = new BufferedHttpEntity(entity);
      long len = entity.getContentLength();
      System.out.println("Length: " + len);
      System.out.println("====================\r\n");
      return EntityUtils.toString(entity, "UTF-8");
    } else {
      System.out.println("entity is null.");
      return null;
    }
  }

  public void setCookie(DefaultHttpClient httpclient, List<Cookie> cookies) {
    if (cookies.isEmpty()) {
      System.out.println("Cookie is empty.");
      return;
    } else {
      for (int i = 0; i < cookies.size(); i++) {
        System.out.println((i + 1) + " - " + cookies.get(i).toString());
        httpclient.getCookieStore().addCookie(cookies.get(i));
      }
      System.out.println();
    }
  }

  // "开心网其它组件URL如下，大家可以添加上自己喜欢的组件URL。"
  // "http://www.kaixin001.com/!slave/index.php", "朋友买卖"
  // "http://www.kaixin001.com/!parking/index.php", "争车位"
  // "http://www.kaixin001.com/!house/index.php?_lgmode=pri", "买房子"
  // "http://www.kaixin001.com/!house/index.php?_lgmode=pri&t=49"
  // "http://www.kaixin001.com/!house/garden/index.php","花园"
  // "http://www.kaixin001.com/!rich/market.php", "超级大亨"
  public String enterComponentContent(String url, String componentName,
      DefaultHttpClient httpclient, List<Cookie> cookies,
      HttpResponse response, HttpEntity entity) throws Exception {
    System.out.println("--- Enter: " + componentName + " ---");
    System.out.println("--- Url:   " + url + " ---");
    setCookie(httpclient, cookies);
    HttpGet httpget = new HttpGet(url);
    response = httpclient.execute(httpget);

    entity = response.getEntity();
    return getContent(entity);
  }

  public void showResponseStatus(HttpResponse response) {
    // System.out.println(response.getProtocolVersion());
    // System.out.println(response.getStatusLine().getStatusCode());
    // System.out.println(response.getStatusLine().getReasonPhrase());
    System.out.println(response.getStatusLine().toString());
    System.out.println("-------------------------\r\n");
  }

  public static void main(String[] args) throws Exception {
    KaiXin001 kx = new KaiXin001();
    DefaultHttpClient httpclient = new DefaultHttpClient();

    HttpPost httpost = new HttpPost("http://www.kaixin001.com/login/login.php");
    List<NameValuePair> qparams = new ArrayList<NameValuePair>();
    qparams.add(new BasicNameValuePair("email", "email"));
    qparams.add(new BasicNameValuePair("password", "password"));

    httpost.setEntity(new UrlEncodedFormEntity(qparams, HTTP.UTF_8));
    HttpResponse response = httpclient.execute(httpost);
    kx.showResponseStatus(response);

    // HttpResponse response = httpclient.execute(httpget);
    HttpEntity entity = response.getEntity();
    kx.getContent(entity);

    // Login
    List<Cookie> cookies = httpclient.getCookieStore().getCookies();
    System.out.println("Post logon cookies:");
    kx.setCookie(httpclient, cookies);

    // Redirect to home page
    String homepage = "http://www.kaixin001.com/home/";
    String content = null;
    content = kx.enterComponentContent(homepage, "Home page", httpclient,
        cookies, response, entity);

    // Component
    String componet = "http://www.kaixin001.com/!rich/market.php";
    content = kx.enterComponentContent(componet, "Component", httpclient,
        cookies, response, entity);

    // --------------------------------------------
    kx.writeToFile("c:/kaixin.html", content);

    // When HttpClient instance is no longer needed,
    // shut down the connection manager to ensure
    // immediate deallocation of all system resources
    httpclient.getConnectionManager().shutdown();
  }
}

    访问开心大亨组件的程序：KaiXin_Rich.java

/*
 * 2009/12/21
 * Author:  Yuan Hongzhi 
 */
import java.awt.Toolkit;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.collections.keyvalue.DefaultKeyValue;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.cookie.Cookie;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;

public class KaiXin_Rich extends KaiXin001 {

  public static List<DefaultKeyValue> curList = new ArrayList<DefaultKeyValue>();

  public static List<DefaultKeyValue> preList = new ArrayList<DefaultKeyValue>();

  public void copyList(List<DefaultKeyValue> src, List<DefaultKeyValue> des) {
    for (DefaultKeyValue dkv : src) {
      DefaultKeyValue kv = new DefaultKeyValue(dkv.getKey(), dkv.getValue());
      des.add(kv);
    }
  }

  public Double subNumber(Object string) {
    String rex = "([\\d\\.]*)";
    Pattern pattern = Pattern.compile(rex);
    Matcher match = pattern.matcher(string.toString());
    if (match.find()) {
      return Double.valueOf(match.group());
    } else
      return -1.0;
  }

  public String extractNoneAscii(Object string) {
    String rex = "([^\\x00-\\xff]+)";
    Pattern pattern = Pattern.compile(rex);
    Matcher match = pattern.matcher(string.toString());
    if (match.find()) {
      return match.group();
    } else
      return "";
  }

  public static void main(String[] args) throws Exception {
    KaiXin_Rich kx = new KaiXin_Rich();

    PropertiesConfiguration config = new PropertiesConfiguration();
    config.load(kx.getResourceAsStream("properties/kaixin001.properties"),
        "UTF-8");

    DefaultHttpClient httpclient = new DefaultHttpClient();

    HttpPost httpost = new HttpPost("http://www.kaixin001.com/login/login.php");
    List<NameValuePair> qparams = new ArrayList<NameValuePair>();
    qparams.add(new BasicNameValuePair("email", config.getString("email")));
    qparams
        .add(new BasicNameValuePair("password", config.getString("password")));

    httpost.setEntity(new UrlEncodedFormEntity(qparams, HTTP.UTF_8));
    HttpResponse response = httpclient.execute(httpost);
    kx.showResponseStatus(response);

    // HttpResponse response = httpclient.execute(httpget);
    HttpEntity entity = response.getEntity();
    kx.getContent(entity);

    // Login
    List<Cookie> cookies = httpclient.getCookieStore().getCookies();
    System.out.println("Post logon cookies:");
    kx.setCookie(httpclient, cookies);

    // Redirect to home page
    String homepage = "http://www.kaixin001.com/home/";
    String content = null;
    content = kx.enterComponentContent(homepage, "Home page", httpclient,
        cookies, response, entity);

    int loopTime = config.getInt("times");
    long sleepTime = config.getLong("period") * 60;
    for (int j = 0; j < loopTime; j++) {
      // Component
      String componet = config.getString("url");
      content = kx.enterComponentContent(componet, "Component", httpclient,
          cookies, response, entity);

      int beginIndex = content.indexOf(config.getString("startRex"));
      int endIndex = content.lastIndexOf(config.getString("endRex"));
      content = content.substring(beginIndex, endIndex);
      // --------------------------------------------
      String rex = config.getString("displayKeyRex");
      Pattern pattern = Pattern.compile(rex, Pattern.MULTILINE);
      Matcher match = pattern.matcher(content);
      List<String> keys = new ArrayList<String>();
      String matched = null;
      while (match.find()) {
        matched = match.group();
        keys.add(matched);
      }

      rex = config.getString("displayValueRex");
      pattern = Pattern.compile(rex, Pattern.MULTILINE);
      match = pattern.matcher(content);
      List<String> values = new ArrayList<String>();
      while (match.find()) {
        matched = match.group();
        values.add(matched);
      }

      DefaultKeyValue kv = null;
      for (int i = 0; i < keys.size(); i++) {
        kv = new DefaultKeyValue(keys.get(i), values.get(i));
        curList.add(kv);
      }

      String rtnString = "";
      String eachLine = null;
      for (DefaultKeyValue dkv : curList) {
        eachLine = dkv.getKey() + "\t:" + dkv.getValue();
        rtnString += eachLine;
        rtnString += "\r\n";
        System.out.println(eachLine);
      }

      System.out.println("\r\n===== Changed =====\r\n");
      String allPriceString = "===== Changed =====\r\n\r\n";
      StringBuffer price = null;
      double changed = 0;
      boolean beepFlag = false;
      for (int i = 0; i < curList.size() && curList.size() == preList.size(); i++) {
        double curMoney = kx.subNumber(curList.get(i).getValue());
        double preMoney = kx.subNumber(preList.get(i).getValue());
        if ((curMoney - preMoney) > 1E-5) {
          changed = curMoney - preMoney;

          DecimalFormat format = new DecimalFormat("###.##");
          String number = format.format(changed);

          price = new StringBuffer();
          price.append(curList.get(i).getKey());
          price.append("\t: ");
          price.append(preList.get(i).getValue());
          price.append(" -> ");
          price.append(curList.get(i).getValue());
          price.append("\t");
          price.append(" Changed: ");
          price.append(number);
          price.append(kx.extractNoneAscii(curList.get(i).getValue()));
          System.out.println(price);
          allPriceString = allPriceString + price.toString() + "\r\n";
          beepFlag = true;
        }
      }
      if (beepFlag) {
        Toolkit.getDefaultToolkit().beep();
      }
      preList.clear();

      // System.out.println(content);
      String dateTime = DateUtils
          .getSystemDateTime(DateTimePattern.DATE_TIME_LONG_UNFORMAT);
      kx.writeToFile("c:/kaixin001/price_" + dateTime + ".txt", rtnString
          + "\r\n" + allPriceString);
      // kx.writeToFile("c:/kaixin.html", content);

      kx.copyList(curList, preList);
      curList.clear();
      Thread.sleep(sleepTime * 1000);
    }

    // When HttpClient instance is no longer needed,
    // shut down the connection manager to ensure
    // immediate deallocation of all system resources
    httpclient.getConnectionManager().shutdown();
  }
}