HttpUtil

package com.rscode.credits.util;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Date;
import java.util.Map;
import java.util.Map.Entry;



/**
 * @author Administrator
 *
 */
public class HttpUtil {

    
    /**
     * 使用Get方式获取数据
     * 
     * @param url
     *            URL包括参数，http://HOST/XX?XX=XX&XXX=XXX
     * @param charset
     * @return
     */
    public static String sendGet(String url, String charset) {
        String result = "";
        BufferedReader in = null;
        try {
            URL realUrl = new URL(url);
            // 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();
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(), charset));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception 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;
    }

    /**
     * POST请求，字符串形式数据
     * @param url 请求地址
     * @param param 请求数据
     * @param charset 编码方式
     */
    public static String sendPostUrl(String url, String param, String charset) {

        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 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)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(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(), charset));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception 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;
    }
    /**
     * POST请求，Map形式数据
     * @param url 请求地址
     * @param param 请求数据
     * @param charset 编码方式
     */
    @SuppressWarnings("deprecation")
    public static String sendPost(String url, Map<String, String> param,
            String charset) {

        StringBuffer buffer = new StringBuffer();
        if (param != null && !param.isEmpty()) {
            for (Map.Entry<String, String> entry : param.entrySet()) {
                buffer.append(entry.getKey()).append("=")
                        .append(URLEncoder.encode(entry.getValue()))
                        .append("&");

            }
        }
        buffer.deleteCharAt(buffer.length() - 1);

        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 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)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(buffer);
            // 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(), charset));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception 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;
    }
    
    /**
     * POST请求，Map形式数据(加传图片)
     * @param requestUrl 请求地址
     * @param requestHeader 请求头（不传，为空）
     * @param formTexts （不含文件参数）
     * @param files （文件原始路径）
     * @param requestEncoding 编码方式
     * @param responseEncoding 编码方式
     * 
     * 
     * eg:String data = HttpUtil.sendPostContantFile("http://"+systemURL+"/credit/event/addCreditsShop"," ", paraMap, fileMap, "", "");
     */ 
    public static String sendPostContantFile(String requestUrl, Map<String, String> requestHeader, Map<String, String> formTexts, Map<String, String> files, String requestEncoding, String responseEncoding) {
        OutputStream out = null;
        BufferedReader reader = null;
        String result = "";
        try {
            if (requestUrl == null || requestUrl.isEmpty()) {
                return result;
            }
            URL realUrl = new URL(requestUrl);
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*");
            connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0");
            if (requestHeader != null && requestHeader.size() > 0) {
                for (Entry<String, String> entry : requestHeader.entrySet()) {
                    connection.setRequestProperty(entry.getKey(), entry.getValue());
                }
            }
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");
            if (requestEncoding == null || requestEncoding.isEmpty()) {
                requestEncoding = "UTF-8";
            }
            if (responseEncoding == null || responseEncoding.isEmpty()) {
                responseEncoding = "UTF-8";
            }
            if (requestHeader != null && requestHeader.size() > 0) {
                for (Entry<String, String> entry : requestHeader.entrySet()) {
                    connection.setRequestProperty(entry.getKey(), entry.getValue());
                }
            }
            if (files == null || files.size() == 0) {
                connection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
                out = new DataOutputStream(connection.getOutputStream());
                if (formTexts != null && formTexts.size() > 0) {
                    String formData = "";
                    for (Entry<String, String> entry : formTexts.entrySet()) {
                        formData += entry.getKey() + "=" + entry.getValue() + "&";
                    }
                    formData = formData.substring(0, formData.length() - 1);
                    out.write(formData.toString().getBytes(requestEncoding));
                }
            } else {
                String boundary = "-----------------------------" + String.valueOf(new Date().getTime());
                connection.setRequestProperty("content-type", "multipart/form-data; boundary=" + boundary);
                out = new DataOutputStream(connection.getOutputStream());
                if (formTexts != null && formTexts.size() > 0) {
                    StringBuilder sbFormData = new StringBuilder();
                    for (Entry<String, String> entry : formTexts.entrySet()) {
                        sbFormData.append("--" + boundary + "\r\n");
                        sbFormData.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"\r\n\r\n");
                        sbFormData.append(entry.getValue() + "\r\n");
                    }
                    out.write(sbFormData.toString().getBytes(requestEncoding));
                }
                for (Entry<String, String> entry : files.entrySet()) {
                    String fileName = entry.getKey();
                    String filePath = entry.getValue();
                    if (fileName == null || fileName.isEmpty() || filePath == null || filePath.isEmpty()) {
                        continue;
                    }
                    File file = new File(filePath);
                    if (!file.exists()) {
                        continue;
                    }
                    out.write(("--" + boundary + "\r\n").getBytes(requestEncoding));
                    out.write(("Content-Disposition: form-data; name=\"" + fileName + "\"; filename=\"" + file.getName() + "\"\r\n").getBytes(requestEncoding));
                    out.write(("Content-Type: application/x-msdownload\r\n\r\n").getBytes(requestEncoding));
                    DataInputStream in = new DataInputStream(new FileInputStream(file));
                    int bytes = 0;
                    byte[] bufferOut = new byte[1024];
                    while ((bytes = in.read(bufferOut)) != -1) {
                        out.write(bufferOut, 0, bytes);
                    }
                    in.close();
                    out.write(("\r\n").getBytes(requestEncoding));
                }
                //out.write(("--" + boundary + "--").getBytes(requestEncoding));这样写微信公众号开发上传素材有问题
                                out.write(("--" + boundary + "--\r\n").getBytes(requestEncoding));
            }
            out.flush();
            out.close();
            out = null;
            reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding));
            String line;
            while ((line = reader.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送POST请求出现异常！");
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

    
    
    /**
     * 使用Get方式获取数据
     * 
     * @param url
     *            URL包括参数，http://HOST/XX?XX=XX&XXX=XXX
     * @param requestHeader
     * @param charset
     * @return
     */
    public static String sendGet(String requestUrl, Map<String, String> requestHeader, String responseEncoding) {
        String result = "";
        BufferedReader reader = null;
        try {
            if (requestUrl == null || requestUrl.isEmpty()) {
                return result;
            }
            URL realUrl = new URL(requestUrl);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "text/html, application/xhtml+xml, image/jxr, */*");
            connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0");
            if (requestHeader != null && requestHeader.size() > 0) {
                for (Entry<String, String> entry : requestHeader.entrySet()) {
                    connection.setRequestProperty(entry.getKey(), entry.getValue());
                }
            }
            connection.connect();
            if (responseEncoding == null || responseEncoding.isEmpty()) {
                responseEncoding = "UTF-8";
            }
            reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), responseEncoding));
            String line;
            while ((line = reader.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常!");
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return result;
    }
    /*public static void main(String[] arg){
        ArrayList<String> hrefList = new ArrayList<String>();
        String data = HttpUtil.sendGet("http://172.16.216.27:8080/recommend//hello", "UTF-8");
        System.out.println(data);
        Document doc = Jsoup.parse(data);
        //Elements elements = doc.getElementsByTag("li");
        Elements elementsByClass = doc.getElementsByClass("s-access-detail-page");
        for (Element element : elementsByClass) {
            System.out.println(element.text());
            String href = element.attr("href");
            hrefList.add(href);
            System.out.println(href);
        }
        System.out.println("111111");
    }*/

}