java针对http远程调用工具类

package com.common.utils;

import org.apache.http.util.TextUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.lang.Nullable;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpUtil {

    public static Logger logger = LoggerFactory.getLogger(HttpUtil.class);

    /**
     * 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。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        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("Charset", "UTF-8");
            conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");
            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()));
            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;
    }
    /**
     * GET:
     * 1、创建远程连接
     * 2、设置连接方式（get、post、put）
     * 3、设置连接 超时时间
     * 4、设置响应读取时间
     * 5、发起请求
     * 6、获取请求数据
     * 7、关闭连接
     *
     * POST:
     * 1、创建远程连接
     * 2、设置连接方式（get、post、put）
     * 3、设置连接 超时时间
     * 4、设置响应读取时间
     * 5、当向远程服务器传送数据/写数据时，需要设置为true(setDoOutput)
     * 6、当前向远程服务器读取数据时，设置为true,该参数可有可无（setDoInput）
     * 7、设置传入参数格式（setRequestProperty）
     * 8、设置鉴权信息：Authorization:（setRequestProperty）
     * 9、设置参数
     * 10、发起请求
     * 11、获取请求数据
     * 12、关闭连接
     */
    //通过JDK网络类Java.net.HttpURLConnection

    /**
     * http get请求
     *
     * @param httpUrl 请求地址
     * @return 响应数据
     */
    public static String doGet(String httpUrl) {
        //链接
        HttpURLConnection connection = null;
        InputStream is = null;
        BufferedReader br = null;
        StringBuffer result = new StringBuffer();
        try {
            //创建连接
            URL url = new URL(httpUrl);
            connection = (HttpURLConnection) url.openConnection();
            //设置请求方式
            connection.setRequestMethod("GET");
            //设置连接超时时间(毫秒)
            connection.setConnectTimeout(15000);
            //开始连接
            connection.connect();
            //获取响应数据
            if (connection.getResponseCode() == 200) {
                //获取返回数据
                is = connection.getInputStream();
                if (null != is) {
                    br = new BufferedReader(new InputStreamReader(is, "utf-8"));
                    String temp = null;
                    while (null != (temp = br.readLine())) {
                        result.append(temp);
                    }
                }
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //关闭远程连接
            connection.disconnect();
        }
        return result.toString();
    }

    /**
     * http post请求
     *
     * @param httpUrl 请求地址
     * @param param   请求参数
     * @return 返回结果
     */
    public static String doPost(String httpUrl, @Nullable String param) {
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        BufferedReader br = null;
        StringBuffer result = new StringBuffer();
        try {
            //创建连接对象
            URL url = new URL(httpUrl);
            //创建链接
            connection = (HttpURLConnection) url.openConnection();
            //设置请求方法
            connection.setRequestMethod("POST");
            //设置连接超时时间(毫秒)
            connection.setConnectTimeout(15000);
            //设置读取超时时间
            connection.setReadTimeout(15000);
            //DoOutput设置是否想httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个值
            //设置是否可读取
            connection.setDoInput(true);
            connection.setDoOutput(true);
            //设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //拼装参数
            if (null != param && param.equals("")) {
                //设置参数
                os = connection.getOutputStream();
                //拼装参数
                os.write(param.getBytes("UTF-8"));
            }
            //设置权限
            //设置请求头
            //开启连接
            connection.connect();
            //读取响应
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                if (null != is) {
                    br = new BufferedReader(new InputStreamReader(is, "utf-8"));
                    String temp = null;
                    while (null != (temp = br.readLine())) {
                        result.append(temp);
                    }
                }
            }

        } catch (IOException e) {
            System.out.println("请求错误--" + e.getMessage());
            e.printStackTrace();
        } finally {
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //关闭远程连接
            connection.disconnect();
        }
        return result.toString();
    }

    /**
     * http post请求，Content-Type为json
     *
     * @param httpUrl 请求地址
     * @param param   请求参数（json）
     * @return 返回结果
     */
    public static String doPostJson(String httpUrl, @Nullable String param) {
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        BufferedReader br = null;
        StringBuffer result = new StringBuffer();
        try {
            //创建连接对象
            URL url = new URL(httpUrl);
            //创建链接
            connection = (HttpURLConnection) url.openConnection();
            //设置请求方法
            connection.setRequestMethod("POST");
            //设置连接超时时间(毫秒)
            connection.setConnectTimeout(15000);
            //设置读取超时时间
            connection.setReadTimeout(15000);
            //DoOutput设置是否想httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个值
            //设置是否可读取
            connection.setDoInput(true);
            connection.setDoOutput(true);
            //设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.setRequestProperty("Authorization", "Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0");
            //拼装参数
            if (!TextUtils.isBlank(param)) {
                //设置参数
                os = connection.getOutputStream();
                //拼装参数
                os.write(param.getBytes("UTF-8"));
            }
            //设置权限
            //设置请求头
            //开启连接
            connection.connect();
            //读取响应
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                if (null != is) {
                    br = new BufferedReader(new InputStreamReader(is, "utf-8"));
                    String temp = null;
                    while (null != (temp = br.readLine())) {
                        result.append(temp);
                    }
                }
            }

        } catch (IOException e) {
            System.out.println("请求错误--" + e.getMessage());
            e.printStackTrace();
        } finally {
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //关闭远程连接
            connection.disconnect();
        }
        return result.toString();
    }
    /**
     * http post请求，Content-Type为json
     *
     * @param httpUrl 请求地址
     * @param param   请求参数（json）
     * @return 返回结果
     */
    public static String doPostJsonTokeen(String httpUrl, @Nullable String param) {
        logger.info("发送post请求参数:{},地址：{}",param,httpUrl);
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        BufferedReader br = null;
        StringBuffer result = new StringBuffer();
        try {
            //创建连接对象
            URL url = new URL(httpUrl);
            //创建链接
            connection = (HttpURLConnection) url.openConnection();
            //设置请求方法
            connection.setRequestMethod("POST");
            //设置连接超时时间(毫秒)
            connection.setConnectTimeout(15000);
            //设置读取超时时间
            connection.setReadTimeout(15000);
            //DoOutput设置是否想httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个值
            //设置是否可读取
            connection.setDoInput(true);
            connection.setDoOutput(true);
            //设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //拼装参数
            if (!TextUtils.isBlank(param)) {
                //设置参数
                os = connection.getOutputStream();
                //拼装参数
                os.write(param.getBytes("UTF-8"));
            }
            //设置权限
            //设置请求头
            //开启连接
            connection.connect();
            //读取响应
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                if (null != is) {
                    br = new BufferedReader(new InputStreamReader(is, "utf-8"));
                    String temp = null;
                    while (null != (temp = br.readLine())) {
                        result.append(temp);
                    }
                }
            }
        logger.info("返回的参数：{}",result);
        } catch (IOException e) {
            logger.info("请求错误--" + e.getMessage());
            e.printStackTrace();
        } finally {
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //关闭远程连接
            connection.disconnect();
        }
        return result.toString();
    }

    /**
     * 开票接口使用
     * http post请求，Content-Type为json
     *
     * @param httpUrl 请求地址
     * @param param   请求参数（json）
     * @return 返回结果
     */
    public static String doPostOpenJson(String httpUrl, @Nullable String param) {
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        BufferedReader br = null;
        StringBuffer result = new StringBuffer();
        try {
            //创建连接对象
            URL url = new URL(httpUrl);
            //创建链接
            connection = (HttpURLConnection) url.openConnection();
            //设置请求方法
            connection.setRequestMethod("POST");
            //设置连接超时时间(毫秒)
            connection.setConnectTimeout(15000);
            //设置读取超时时间
            connection.setReadTimeout(15000);
            //DoOutput设置是否想httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个值
            //设置是否可读取
            connection.setDoInput(true);
            connection.setDoOutput(true);
            //设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.setRequestProperty("client-platform", "common");
            //拼装参数
            if (!TextUtils.isBlank(param)) {
                //设置参数
                os = connection.getOutputStream();
                //拼装参数
                os.write(param.getBytes("UTF-8"));
            }
            //设置权限
            //设置请求头
            //开启连接
            connection.connect();
            //读取响应
            if (connection.getResponseCode() == 200) {
                is = connection.getInputStream();
                if (null != is) {
                    br = new BufferedReader(new InputStreamReader(is, "utf-8"));
                    String temp = null;
                    while (null != (temp = br.readLine())) {
                        result.append(temp);
                    }
                }
            }

        } catch (IOException e) {
            System.out.println("请求错误--" + e.getMessage());
            e.printStackTrace();
        } finally {
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            //关闭远程连接
            connection.disconnect();
        }
        return result.toString();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     * url 发送请求的 URL
     * params 请求的参数集合
     * @return 远程资源的响应结果
     */
    @SuppressWarnings("unused")
    public static String sendPostParams(String url, Map<String, String> params) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new    StringBuilder();
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn =(HttpURLConnection) realUrl.openConnection();
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // POST方法
            conn.setRequestMethod("POST");
            // 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
            if (params != null) {
                StringBuilder param = new    StringBuilder();
                for (Map.Entry<   String,    String> entry : params.entrySet()) {
                    if(param.length()>0){
                        param.append("&");
                    }
                    param.append(entry.getKey());
                    param.append("=");
                    param.append(entry.getValue());
                    System.out.println(entry.getKey()+":"+entry.getValue());
                }
                System.out.println("param:"+param.toString());
                out.write(param.toString());
            }
            // 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(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(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.toString();
    }

}