java模擬瀏覽器發送請求

package test;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletRequest;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.HttpClientUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

public class TestRequestUtil {
//    public static void main(String[] args) {
//        doGetStr("http://dzdzwxcs1.ciitc.com.cn/s/VcbrYFtK");
//    }
    /**
     * 接口調用 GET
     */
    public static void httpURLConectionGET(String urls) {
        try {
            URL url = new URL(urls); // 把字符串轉換為URL請求地址
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打開連接
            connection.connect();// 連接會話
            // 獲取輸入流
            BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder sb = new StringBuilder();
            while ((line = br.readLine()) != null) {// 循環讀取流
                sb.append(line);    //寫入對象中
            }
            br.close();// 關閉流
            connection.disconnect();// 斷開連接
            System.out.println(sb.toString());
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("請求失敗!");
        }
    }

    /**
     * 接口調用 POST
     */
    public static void httpURLConnectionPOST(String urls) {
        try {
            URL url = new URL(urls);

            // 將url 以 open方法返回的urlConnection 連接強轉為HttpURLConnection連接 (標識一個url所引用的遠程對象連接)
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此時cnnection只是為一個連接對象,待連接中

            // 設置連接輸出流為true,默認false (post 請求是以流的方式隱式的傳遞參數)
            connection.setDoOutput(true);

            // 設置連接輸入流為true
            connection.setDoInput(true);

            // 設置請求方式為post
            connection.setRequestMethod("POST");

            // post請求緩存設為false
            connection.setUseCaches(false);

            // 設置該HttpURLConnection實例是否自動執行重定向
            connection.setInstanceFollowRedirects(true);

            // 設置請求頭里面的各個屬性 (以下為設置內容的類型,設置為經過urlEncoded編碼過的from參數)
            // application/x-javascript text/xml->xml數據 application/x-javascript->json對象
            // application/x-www-form-urlencoded->表單數據
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            // 建立連接 (請求未開始,直到connection.getInputStream()方法調用時才發起,以上各個參數設置需在此方法之前進行)
            connection.connect();

            // 創建輸入輸出流,用於往連接里面輸出攜帶的參數,(輸出內容為?后面的內容)
            DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());
            String parm = "storeId=" + URLEncoder.encode("32", "utf-8"); // URLEncoder.encode()方法 為字符串進行編碼

            // 將參數輸出到連接
            dataout.writeBytes(parm);

            // 輸出完成后刷新並關閉流
            dataout.flush();
            dataout.close(); // 重要且易忽略步驟 (關閉流,切記!)

            System.out.println(connection.getResponseCode());

            // 連接發起請求,處理服務器響應 (從連接獲取到輸入流並包裝為bufferedReader)
            BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            @SuppressWarnings("unused")
            String line = null;
            StringBuilder sb = new StringBuilder(); // 用來存儲響應數據

            // 循環讀取流,若不到結尾處
            while ((line = bf.readLine()) != null) {
                sb.append(bf.readLine());
            }
            bf.close(); // 重要且易忽略步驟 (關閉流,切記!)
            connection.disconnect(); // 銷毀連接
            System.out.println(sb.toString());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * get 請求 @param @param url @return String @throws
     */
    public static String doGetStr(String url) {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        String result = "";

        try {
            HttpResponse response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity, "UTF-8");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            HttpClientUtils.closeQuietly(httpClient);
        }
        return result;
    }

    /**
     * post 請求 @param @param url @param @param outStr @throws
     */
    public static String doPostStr(String url, String outStr) {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost();
        String result = "";

        try {
            httpPost.setEntity(new StringEntity(outStr, "UTF-8"));
            HttpResponse response = httpClient.execute(httpPost);
            result = EntityUtils.toString(response.getEntity(), "UTF-8");
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            HttpClientUtils.closeQuietly(httpClient);
        }
        return result;
    }
}

以上是個人根據網上總結的幾種請求方法。