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。