java發(fā)起get請(qǐng)求和post請(qǐng)求的各種情況整合。具體看代碼以及注釋。其中Constants.UTF8本質(zhì)是指"UTF-8"文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-757998.html

import java.io.*;
import java.net.*;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 通用http發(fā)送方法
 * 
 * @author ruoyi
 */
public class HttpUtils
{
    private static final Logger log = LoggerFactory.getLogger(HttpUtils.class);

    /**
     * 向指定 URL 發(fā)送GET方法的請(qǐng)求
     *
     * @param url 發(fā)送請(qǐng)求的 URL
     * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendGet(String url)
    {
        return sendGet(url, "");
    }

    /**
     * 向指定 URL 發(fā)送GET方法的請(qǐng)求
     *
     * @param url 發(fā)送請(qǐng)求的 URL
     * @param param 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
     * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendGet(String url, String param)
    {
        return sendGet(url, param, Constants.UTF8);
    }

    /**
     * 向指定 URL 發(fā)送GET方法的請(qǐng)求
     *
     * @param url 發(fā)送請(qǐng)求的 URL
     * @param param 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
     * @param contentType 編碼類型
     * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendGet(String url, String param, String contentType)
    {
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try
        {
            String urlNameString = (param!=null&&param!="") ? url + "?" + param : url;
            log.info("sendGet - {}", urlNameString);
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));
            String line;
            while ((line = in.readLine()) != null)
            {
                result.append(line);
            }
            log.info("recv - {}", result);
        }
        catch (ConnectException e)
        {
            log.error("調(diào)用HttpUtils.sendGet ConnectException, url=" + url + ",param=" + param, e);
        }
        catch (SocketTimeoutException e)
        {
            log.error("調(diào)用HttpUtils.sendGet SocketTimeoutException, url=" + url + ",param=" + param, e);
        }
        catch (IOException e)
        {
            log.error("調(diào)用HttpUtils.sendGet IOException, url=" + url + ",param=" + param, e);
        }
        catch (Exception e)
        {
            log.error("調(diào)用HttpsUtil.sendGet Exception, url=" + url + ",param=" + param, e);
        }
        finally
        {
            try
            {
                if (in != null)
                {
                    in.close();
                }
            }
            catch (Exception ex)
            {
                log.error("調(diào)用in.close Exception, url=" + url + ",param=" + param, ex);
            }
        }
        return result.toString();
    }
    /**
     * 向指定 URL 發(fā)送POST方法的請(qǐng)求
     *
     * @param param 發(fā)送請(qǐng)求的 URL
     * @param param 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是json的形式。
     * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendPostJson(String reqUrl, String param)
    {
        String result = "";
        HttpURLConnection httpURLConnection = null;
        BufferedReader reader = null;
        try {
            URL url = new URL(reqUrl);
            httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setConnectTimeout(5000);
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            httpURLConnection.setUseCaches(false);
            httpURLConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
            httpURLConnection.connect();
            OutputStream os = httpURLConnection.getOutputStream();
            os.write(param.getBytes("utf-8"));
            os.flush();
            os.close();
            if (httpURLConnection.getResponseCode() == 200) {
                String encoding = httpURLConnection.getContentEncoding();
                log.info("編碼格式",encoding);
                //注意StandardCharsets.UTF_8 否則打成jar包后會(huì)出現(xiàn)中文亂碼
                reader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(), StandardCharsets.UTF_8));
                String data = "";
                StringBuilder builder = new StringBuilder();
                while ((data = reader.readLine()) != null) {
                    builder.append(data);
                }
                result = builder.toString();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
                if (httpURLConnection != null) {
                    httpURLConnection.disconnect();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        log.info("轉(zhuǎn)發(fā)結(jié)果===>"+result);
        return result;
    }

    /**
     * post方式請(qǐng)求服務(wù)器(https協(xié)議)
     *
     * @param url     求地址
     * @param content 參數(shù)
     * @return
     */
    public static String sendJsonToHttpsPost(String url, String content) {
        try {
            /*
             * 類HttpsURLConnection似乎并沒(méi)有提供方法設(shè)置信任管理器。其實(shí)，
             * HttpsURLConnection通過(guò)SSLSocket來(lái)建立與HTTPS的安全連接
             * ，SSLSocket對(duì)象是由SSLSocketFactory生成的。
             * HttpsURLConnection提供了方法setSSLSocketFactory
             * (SSLSocketFactory)設(shè)置它使用的SSLSocketFactory對(duì)象。
             * SSLSocketFactory通過(guò)SSLContext對(duì)象來(lái)獲得，在初始化SSLContext對(duì)象時(shí)，可指定信任管理器對(duì)象。
             */
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[]{new TrustAnyTrustManager()},
                    new java.security.SecureRandom());

            URL console = new URL(url);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
            conn.setDoOutput(true);
            // 設(shè)置請(qǐng)求頭
            conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
            conn.connect();
            DataOutputStream out = new DataOutputStream(conn.getOutputStream());
            out.write(content.getBytes(Constants.UTF8));
            // 刷新、關(guān)閉
            out.flush();
            out.close();
            InputStream is = conn.getInputStream();
            if (is != null) {
                /*ByteArrayOutputStream outStream = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024];
                int len = 0;
                while ((len = is.read(buffer)) != -1) {
                    outStream.write(buffer, 0, len);
                }
                is.close();*/
                //注意StandardCharsets.UTF_8 否則打成jar包后會(huì)出現(xiàn)中文亂碼
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));
                String data = "";
                StringBuilder builder = new StringBuilder();
                while ((data = bufferedReader.readLine()) != null) {
                    builder.append(data);
                }
                System.out.println("結(jié)果====》        ");
                System.out.println(builder.toString());
                return  builder.toString();
//                return new String(outStream.toByteArray(), Constants.UTF8);
            }
        } catch (Exception e) {
            log.info("JSON數(shù)據(jù)發(fā)送失敗，異常：{}", e.getMessage());
            log.error("異常：", e);
        }
        return null;
    }
    /**
     * 向指定 URL 發(fā)送POST方法的請(qǐng)求
     *
     * @param url 發(fā)送請(qǐng)求的 URL
     * @param param 請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
     * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendPost(String url, String param)
    {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try
        {
            log.info("sendPost - {}", url);
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            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("Accept-Charset", "utf-8");
            conn.setRequestProperty("contentType", "utf-8");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
            String line;
            while ((line = in.readLine()) != null)
            {
                result.append(line);
            }
            log.info("recv - {}", result);
        }
        catch (ConnectException e)
        {
            log.error("調(diào)用HttpUtils.sendPost ConnectException, url=" + url + ",param=" + param, e);
        }
        catch (SocketTimeoutException e)
        {
            log.error("調(diào)用HttpUtils.sendPost SocketTimeoutException, url=" + url + ",param=" + param, e);
        }
        catch (IOException e)
        {
            log.error("調(diào)用HttpUtils.sendPost IOException, url=" + url + ",param=" + param, e);
        }
        catch (Exception e)
        {
            log.error("調(diào)用HttpsUtil.sendPost Exception, url=" + url + ",param=" + param, e);
        }
        finally
        {
            try
            {
                if (out != null)
                {
                    out.close();
                }
                if (in != null)
                {
                    in.close();
                }
            }
            catch (IOException ex)
            {
                log.error("調(diào)用in.close Exception, url=" + url + ",param=" + param, ex);
            }
        }
        return result.toString();
    }

    public static String sendSSLPost(String url, String param)
    {
        StringBuilder result = new StringBuilder();
        String urlNameString = url + "?" + param;
        try
        {
            log.info("sendSSLPost - {}", urlNameString);
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[] { new TrustAnyTrustManager() }, new java.security.SecureRandom());
            URL console = new URL(urlNameString);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            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("Accept-Charset", "utf-8");
            conn.setRequestProperty("contentType", "utf-8");
            conn.setDoOutput(true);
            conn.setDoInput(true);

            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
            conn.connect();
            InputStream is = conn.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String ret = "";
            while ((ret = br.readLine()) != null)
            {
                if (ret != null && !"".equals(ret.trim()))
                {
                    result.append(new String(ret.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8));
                }
            }
            log.info("recv - {}", result);
            conn.disconnect();
            br.close();
        }
        catch (ConnectException e)
        {
            log.error("調(diào)用HttpUtils.sendSSLPost ConnectException, url=" + url + ",param=" + param, e);
        }
        catch (SocketTimeoutException e)
        {
            log.error("調(diào)用HttpUtils.sendSSLPost SocketTimeoutException, url=" + url + ",param=" + param, e);
        }
        catch (IOException e)
        {
            log.error("調(diào)用HttpUtils.sendSSLPost IOException, url=" + url + ",param=" + param, e);
        }
        catch (Exception e)
        {
            log.error("調(diào)用HttpsUtil.sendSSLPost Exception, url=" + url + ",param=" + param, e);
        }
        return result.toString();
    }

    public static class TrustAnyTrustManager implements X509TrustManager
    {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType)
        {
        }

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType)
        {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers()
        {
            return new X509Certificate[] {};
        }
    }

    public static class TrustAnyHostnameVerifier implements HostnameVerifier
    {
        @Override
        public boolean verify(String hostname, SSLSession session)
        {
            return true;
        }
    }
}

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