java2: HttpClient，實現登入，請求等操作，session保持

阿新 • • 發佈：2019-01-15

HttpClient，httpclient.jar包中的，我則喜歡折射成類似於dll以用的形式，知道在哪個namespace下

可以從這裡獲取或得到些資訊

實現的目標：

1.模擬登入

2.登入之後，模擬提交請求

關鍵點：

1.session狀態保持

2.頁面隱藏的屬性獲取

之前用HttpURLConnection，但未成功，瓶頸在於沒有繞過session保持上，最終還是使用HttpClient，實現相對容易些

示例程式碼

（程式碼有刪減，不見得能夠跑通，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
*
*/publicclass LoginFormDemo {

publicstaticvoid DemoLoginTwo() throws Exception {

DefaultHttpClient httpclient =new DefaultHttpClient();

HttpGet httpget =new HttpGet(
);

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);

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---------------------"); // 這裡是為了獲取頁面上的hidden，用來提交的時候繼續使用
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("host
String keywords ="001autop"+ randomString(4);
nvps =new ArrayList<NameValuePair>();
// post時，提交的form資訊
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----------------");
}

/**
* 產生隨機字串
* */privatestatic Random randGen =null;
privatestaticchar[] numbersAndLetters =null;
privatestatic Object initLock =new Object();

publicstaticfinal String randomString(int length) {

if (length <1) {
returnnull;
}
if (randGen ==null) {
synchronized (initLock) {
if (randGen ==null) {
randGen =new Random();
numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz"+"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
.toCharArray();
// numbersAndLetters =
// ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray(); }
}
}
char[] randBuffer =newchar[length];
for (int i =0; i < randBuffer.length; i++) {
randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
// randBuffer[i] = numbersAndLetters[randGen.nextInt(35)]; }
returnnew String(randBuffer);
}

publicstaticvoid 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("檔案存在");
f.delete();
} else {

}
System.out.println("檔案不存在，正在建立...");
if (f.createNewFile()) {
System.out.println("檔案建立成功！");
} else {
System.out.println("檔案建立失敗！");
}
BufferedReader input =new BufferedReader(new FileReader(f));

while ((s = input.readLine()) !=null) {
s1 += s +"\n";
}
// System.out.println("檔案內容：" + s1); input.close();
s1 += content;

BufferedWriter output =new BufferedWriter(new FileWriter(f));
output.write(s1);
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}

}

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