Java模拟HTTP请求，带cookie

来源：互联网发布：宝宝拍照换装的软件编辑：程序博客网时间：2024/05/18 01:11
不多说，直接上代码
import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;public class HttpClientUtil {public static final String urlString = "http://....?passport=...&password=...";  //先登录保存cookiepublic static final String urlString2 = "http://......";public String sessionId = "";public void doGet(String urlStr) throws IOException{String key = "";String cookieVal = "";URL url = new URL(urlStr);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.connect(); //到此步只是建立与服务器的tcp连接，并未发送http请求/**  * 设置cookie */if(!sessionId.equals("")){connection.setRequestProperty("Cookie", sessionId);}for(int i=1;(key=connection.getHeaderField(i))!=null;i++){cookieVal = connection.getHeaderField(i);cookieVal = cookieVal.substring(0,cookieVal.indexOf(";")>-1?cookieVal.indexOf(";"):cookieVal.length()-1);sessionId = sessionId + cookieVal + ";";}//直到getInputStream()方法调用请求才真正发送出去BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));StringBuilder sb = new StringBuilder();String line;while((line=br.readLine()) != null){sb.append(line);sb.append("\n");}System.out.println(sb.toString());br.close();connection.disconnect();}public void doPost() throws IOException{URL url = new URL(urlString);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setDoOutput(true); //设置连接输出流为true,默认false (post 请求是以流的方式隐式的传递参数)connection.setDoInput(true); // 设置连接输入流为trueconnection.setRequestMethod("POST"); // 设置请求方式为postconnection.setUseCaches(false); // post请求缓存设为falseconnection.setInstanceFollowRedirects(true); //// 设置该HttpURLConnection实例是否自动执行重定向// 设置请求头里面的各个属性 (以下为设置内容的类型,设置为经过urlEncoded编码过的from参数)        // application/x-javascript text/xml->xml数据 application/x-javascript->json对象 application/x-www-form-urlencoded->表单数据connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");connection.connect();// 创建输入输出流,用于往连接里面输出携带的参数,(输出内容为?后面的内容)DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());        String parm = "storeId=" + URLEncoder.encode("32", "utf-8"); //URLEncoder.encode()方法  为字符串进行编码                   dataout.writeBytes(parm);         dataout.flush();        dataout.close(); // 重要且易忽略步骤 (关闭流,切记!)                   // 连接发起请求,处理服务器响应  (从连接获取到输入流并包装为bufferedReader)        BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream()));        String line;        StringBuilder sb = new StringBuilder(); // 用来存储响应数据                   // 循环读取流,若不到结尾处        while ((line = bf.readLine()) != null) {            sb.append(bf.readLine());        }        bf.close();    // 重要且易忽略步骤 (关闭流,切记!)        connection.disconnect(); // 销毁连接        System.out.println(sb.toString()); }public static void main(String[] args) throws IOException {HttpClientUtil hcu = new HttpClientUtil();hcu.doGet(urlString);hcu.doGet(urlString2);}}
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