java模拟浏览器发送请求

 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");
 //    }
     /**
      * 接口调用 GET
      */
     public static void httpURLConectionGET(String urls) {
         try {
             URL url = new URL(urls); // 把字符串转换为URL请求地址
             HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接
             connection.connect();// 连接会话
             // 获取输入流
             BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
             String line;
             StringBuilder sb = new StringBuilder();
             while ((line = br.readLine()) != null) {// 循环读取流
                 sb.append(line);    //写入对象中
             }
             br.close();// 关闭流
             connection.disconnect();// 断开连接
             System.out.println(sb.toString());
         } catch (Exception e) {
             e.printStackTrace();
             System.out.println("请求失败!");
         }
     }

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

             // 将url 以 open方法返回的urlConnection 连接强转为HttpURLConnection连接 (标识一个url所引用的远程对象连接)
             HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此时cnnection只是为一个连接对象,待连接中

             // 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.setDoOutput(true);

             // 设置连接输入流为true
             connection.setDoInput(true);

             // 设置请求方式为post
             connection.setRequestMethod("POST");

             // post请求缓存设为false
             connection.setUseCaches(false);

             // 设置该HttpURLConnection实例是否自动执行重定向
             connection.setInstanceFollowRedirects(true);

             // 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");

             // 建立连接 (请求未开始,直到connection.getInputStream()方法调用时才发起,以上各个参数设置需在此方法之前进行)
             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

             // 将参数输出到连接
             dataout.writeBytes(parm);

             // 输出完成后刷新并关闭流
             dataout.flush();
             dataout.close(); // 重要且易忽略步骤 (关闭流,切记!)

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

             // 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()));
             @SuppressWarnings("unused")
             String line = null;
             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());

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

     /**
      * get 请求 @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 请求 @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;
     }
 }

以上是个人根据网上总结的几种请求方法。