java2: 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();
        }
    }

}