HttpClient 模拟登录豆瓣网（有验证码）

我用的是HttpClient 4.3.1的版本

另外用到 json jar包

代码如下：

package com.htt.douban;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;


public class Douban {
private static HttpClient httpClient=new DefaultHttpClient();

//主登录入口
public static void loginDouban(){
String redir="https://www.douban.com/people/144537495/";
String login_src="https://accounts.douban.com/login";
String form_email="你的用户名";
String form_password="你的密码";
String captcha_id=getImgID();
String login="登录";
String captcha_solution="";
System.out.println("请输入验证码：");
BufferedReader buff=new BufferedReader(new InputStreamReader(System.in));
try {
captcha_solution=buff.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//构建参数
List list=new ArrayList();
list.add(new BasicNameValuePair("redir", redir));
list.add(new BasicNameValuePair("form_email", form_email));
list.add(new BasicNameValuePair("form_password", form_password));
list.add(new BasicNameValuePair("captcha-solution", captcha_solution));
list.add(new BasicNameValuePair("captcha-id", captcha_id));
list.add(new BasicNameValuePair("login", login));
HttpPost httpPost = new HttpPost(login_src);
try {
httpPost.setEntity(new UrlEncodedFormEntity(list));
HttpResponse response=httpClient.execute(httpPost);
HttpEntity entity=response.getEntity();
String result=EntityUtils.toString(entity,"utf-8");

HttpGet httpGet=new HttpGet(redir);
HttpResponse response1=httpClient.execute(httpGet);
HttpEntity entity1=response1.getEntity();
String result1=EntityUtils.toString(entity1,"utf-8");
System.out.println(result1);

} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
/**
* 获取验证码图片“token”值
* @return token
*/
private static String getImgID(){
String src="https://www.douban.com/j/misc/captcha";
HttpGet httpGet=new HttpGet(src);
String token="";
try {
HttpResponse response=httpClient.execute(httpGet);
HttpEntity entity=response.getEntity();
String content=EntityUtils.toString(entity,"utf-8");
Map mapList=getResultList(content);
token=mapList.get("token");
String url="https:"+mapList.get("url");
downImg(url);
//System.out.println(token);
//System.out.println(url);
//System.out.println(content);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return token;
}
/**
* 用JSON 把数据格式化，并生成迭代器，放入Map中返回
* @param content 请求验证码时服务器返回的数据
* @return Map集合
*/
public static Map getResultList(String content){
Map maplist=new HashMap();

try {
JSONObject jo=new JSONObject(content);
Iterator it = jo.keys();
String key="";
String value="";
while(it.hasNext()){
key=(String) it.next();
value=jo.getString(key);
maplist.put(key, value);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return maplist;
}
/**
* 此方法是下载验证码图片到本地
* @param src  给个验证图片完整的地址
*/
private static void downImg(String src){
File fileDir=new File("D://爬虫测试/yzm");
if(!fileDir.exists()){
fileDir.mkdirs();
}
File file=new File("D://爬虫测试/yzm/yzm.png");
if(file.exists()){
file.delete();
}
InputStream input = null;
FileOutputStream out= null;
HttpGet httpGet=new HttpGet(src);
try {
HttpResponse response=httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
input = entity.getContent();
int i=-1;
byte[] byt=new byte[1024];
out=new FileOutputStream(file);
while((i=input.read(byt))!=-1){
out.write(byt);
}
System.out.println("图片下载成功！");
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public static void main(String[] args) {
loginDouban();
}
}

希望和大家一起学习，共同成长！！