HttpClient，实现登录，请求等操作，session保持
HttpClient，httpclient.jar包中的，我则喜欢折射成类似于dll以用的形式，知道在哪个namespace下
http://hc.apache.org/httpcomponents-client
可以从这里获取或得到些信息
实现的目标：
1.模拟登录
2.登录之后，模拟提交请求
关键点：
1.session状态保持
2.页面隐藏的属性获取
之前用HttpURLConnection，但未成功，瓶颈在于没有绕过session保持上，最终还是使用HttpClient，实现相对容易些
示例代码
（代码有删减，不见得能够跑通，需要修改）
/** * */package httpclienttest;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Random;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.ResponseHandler;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.impl.client.BasicResponseHandler;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.protocol.HTTP;import com.alibaba.ccbu.parseelements.ParseTest;/** * @author forward * */public class LoginFormDemo { public static void DemoLoginTwo() throws Exception { DefaultHttpClient httpclient = new DefaultHttpClient(); HttpGet httpget = new HttpGet( http://xxxx.com/xx.htm); HttpResponse response = httpclient.execute(httpget); HttpEntity entity = response.getEntity(); System.out.println("Login form get: " + response.getStatusLine()); if (entity != null) { entity.consumeContent(); } System.out.println("Initial set of cookies:"); List<Cookie> cookies = httpclient.getCookieStore().getCookies(); if (cookies.isEmpty()) { System.out.println("None"); } else { for (int i = 0; i < cookies.size(); i++) { System.out.println("- " + cookies.get(i).toString()); } } // action=xxx&Password=xxxx HttpPost httpost = new HttpPost( " http://localhost/sss"); List<NameValuePair> nvps = new ArrayList<NameValuePair>(); nvps.add(new BasicNameValuePair("LoginId", "xxxx")); nvps.add(new BasicNameValuePair("Password", "xxxxx")); nvps.add(new BasicNameValuePair("action", "xxxx")); nvps.add(new BasicNameValuePair("eventSubmit_doPost", "xxxx")); httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); response = httpclient.execute(httpost); entity = response.getEntity(); System.out.println("Login form get: " + response.getStatusLine()); if (entity != null) { entity.consumeContent(); } System.out.println("Time now: " + new Date().toString()); System.out.println("-------------------1---------------------"); httpget = new HttpGet( http://localhost/test); System.out.println("executing request " + httpget.getURI()); // Create a response handler ResponseHandler<String> responseHandler = new BasicResponseHandler(); String responseBody = httpclient.execute(httpget, responseHandler); // System.out.println(responseBody); System.out.println("Time now: " + new Date().toString()); System.out.println("-------------------2---------------------"); // 这里是为了获取页面上的hidden，用来提交的时候继续使用 hidden= ParseTest.testTest(responseBody); System.out.println(csrfToken); System.out.println("Time now: " + new Date().toString()); System.out.println("---------------3-post offer begin---------------"); // post offer httpost = new HttpPost(" http://local/test");host String keywords = "001autop" + randomString(4); nvps = new ArrayList<NameValuePair>(); // post时，提交的form信息 nvps.add(new BasicNameValuePair("action", "xxxxx")); nvps.add(new BasicNameValuePair("event_submit_do_process", "submit"));nvps.add(new BasicNameValuePair("topCatFormKey", "58")); nvps.add(new BasicNameValuePair("names1", "xxxx")); nvps.add(new BasicNameValuePair("names2", "9.00")); httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); responseHandler = new BasicResponseHandler(); responseBody = httpclient.execute(httpost, responseHandler); // System.out.println(responseBody); writeFile("E:\\result.html", responseBody); response = httpclient.execute(httpost); entity = response.getEntity(); System.out.println("Login form get: " + response.getStatusLine()); if (entity != null) { entity.consumeContent(); } System.out.println("Time now: " + new Date().toString()); System.out.println("---------------3-post offer end----------------"); } /** * 产生随机字符串 * */ private static Random randGen = null; private static char[] numbersAndLetters = null; private static Object initLock = new Object(); public static final String randomString(int length) { if (length < 1) { return null; } if (randGen == null) { synchronized (initLock) { if (randGen == null) { randGen = new Random(); numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" + "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ") .toCharArray(); // numbersAndLetters = // ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray(); } } } char[] randBuffer = new char[length]; for (int i = 0; i < randBuffer.length; i++) { randBuffer[i] = numbersAndLetters[randGen.nextInt(71)]; // randBuffer[i] = numbersAndLetters[randGen.nextInt(35)]; } return new String(randBuffer); } public static void writeFile(String path, String content) { String s = new String(); String s1 = new String(); try { File f = new File(path); if (f.exists()) { System.out.println("文件存在"); f.delete(); } else { } System.out.println("文件不存在，正在创建..."); if (f.createNewFile()) { System.out.println("文件创建成功！"); } else { System.out.println("文件创建失败！"); } BufferedReader input = new BufferedReader(new FileReader(f)); while ((s = input.readLine()) != null) { s1 += s + "\n"; } // System.out.println("文件内容：" + s1); input.close(); s1 += content; BufferedWriter output = new BufferedWriter(new FileWriter(f)); output.write(s1); output.close(); } catch (Exception e) { e.printStackTrace(); } }}