javaHTTP请求工具类-使用HttpURLConnection实现

package zmx.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

/**
 * Http请求工具类
 *
 */
public class HttpRequestUtil {
    static boolean proxySet = false;
    static String proxyHost = "127.0.0.1";
    static int proxyPort = 8087;
    /**
     * 编码
     * @param source
     * @return
     */
    public static String urlEncode(String source,String encode) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source,encode);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "0";
        }
        return result;
    }


    public static String urlEncodeGBK(String source) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source,"GBK");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return "0";
        }
        return result;
    }
    /**
     * 发起http请求获取返回结果
     * @param req_url 请求地址
     * @return
     */
    public static String httpRequest(String req_url) {
        StringBuffer buffer = new StringBuffer();
        try {
            URL url = new URL(req_url);
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            httpUrlConn.setConnectTimeout(50000);
            httpUrlConn.setReadTimeout(50000);
            httpUrlConn.setRequestMethod("GET");
           // httpUrlConn.setRequestProperty("Accept", "image/png,image/*;q=0.8,*/*;q=0.5");
           // httpUrlConn.setRequestProperty("Accept-Encoding", "gzip");  
           //httpUrlConn.setRequestProperty("Referer", "http://www.hao123.com/");
            httpUrlConn.connect();  //发送请求
            if (httpUrlConn.getResponseCode() == 200) {

            	// 将返回的输入流转换成字符串  
                InputStream inputStream = httpUrlConn.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                String str = null;
                while ((str = bufferedReader.readLine()) != null) {
                    buffer.append(str);
                }
                bufferedReader.close();
                inputStreamReader.close();
                // 释放资源  
                inputStream.close();
                inputStream = null;
                httpUrlConn.disconnect();

            }

        } catch (Exception e) {
            System.out.println(e.getStackTrace());
        }
        return buffer.toString();
    }

    /**
     * 发送http请求取得返回的输入流
     * @param requestUrl 请求地址
     * @return InputStream
     */
    public static InputStream httpRequestIO(String requestUrl) {
        InputStream inputStream = null;
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
            httpUrlConn.setDoInput(true);
            httpUrlConn.setRequestMethod("GET");
            httpUrlConn.connect();
            // 获得返回的输入流  
            inputStream = httpUrlConn.getInputStream();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return inputStream;
    }


    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param isproxy
     *               是否使用代理模式
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param,boolean isproxy) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = null;
            if(isproxy){//使用代理模式
                @SuppressWarnings("static-access")
                Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
                conn = (HttpURLConnection) realUrl.openConnection(proxy);
            }else{
                conn = (HttpURLConnection) realUrl.openConnection();
            }
            // 打开和URL之间的连接

            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");    // POST方法


            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            conn.connect();

            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            // 发送请求参数
            out.write(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    public static void main(String[] args) {

        String url = "http://www.baidu.com/s";
        String para ="word=刘德华";
        String sr=HttpRequestUtil.httpRequest(url);
        //String sr=HttpRequestUtil.sendGet(url,para);
        System.out.println(sr);

        //demo:代理访问
        //String sr=HttpRequestUtil.sendPost(url,para,true);
        //System.out.println(sr);
    }

}

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