UrlConnection doPost Https請求 、編碼設置

UrlConnection doPost方法

/**
 * 發送POST請求
 *
 * @param url         請求地址url
 * @param params      需要發送的請求參數字符串
 * @param connTimeout 連接超時時間（毫秒），如果為null則默認為180秒
 * @param readTimeout 讀取超時時間（毫秒），如果為null則默認為180秒
 * @return 請求響應內容，如果為null則表示請求異常
 */
public static String doPost(String url, String params, Integer connTimeout, Integer readTimeout, String contentType)
{
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try
    {
        URL realUrl = new URL(url);
        // 打開和URL之間的連接,根據url
        URLConnection conn = realUrl.openConnection();
        // 設置通用的請求屬性
        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", contentType == null? "application/json" : contentType);
        // 發送POST請求必須設置如下兩行
        conn.setDoOutput(true);
        conn.setDoInput(true);

        // 設置請求超時時間和讀取超時時間
        conn.setConnectTimeout(connTimeout == null ? 180 : connTimeout);
        conn.setReadTimeout(readTimeout == null ? 180 : readTimeout);

        // 獲取URLConnection對象對應的輸出流
        out = new PrintWriter(conn.getOutputStream());
        // 發送請求參數
        out.print(params);
        // flush輸出流的緩沖
        out.flush();
        // 定義BufferedReader輸入流來讀取URL的響應
        in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String line;
        while ((line = in.readLine()) != null)
            result += line;
    }
    catch (Exception e)
    {
        e.printStackTrace();
        result = null;
    }
    //使用finally塊來關閉輸出流、輸入流
    finally
    {
        try
        {
            if (out != null)
            {
                out.close();
            }
            if (in != null)
            {
                in.close();
            }
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }
    }
    return result;
}

設置請求和返回數據 utf-8 編碼的 doPost 方法

定義請求數據utf-8編碼
out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
定義返回數據 utf-8編碼
in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));

完整設置編碼的doPost方法

/**
 * 發送POST請求
 *
 * @param url         請求地址url
 * @param params      需要發送的請求參數字符串
 * @param connTimeout 連接超時時間（毫秒），如果為null則默認為180秒
 * @param readTimeout 讀取超時時間（毫秒），如果為null則默認為180秒
 * @return 請求響應內容，如果為null則表示請求異常
 */
public static String doPost(String url, String params, Integer connTimeout, Integer readTimeout, String contentType)
{
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try
    {
        URL realUrl = new URL(url);
        // 打開和URL之間的連接,根據url
        URLConnection conn = realUrl.openConnection();
        // 設置通用的請求屬性
        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", contentType == null? "application/json" : contentType);
        // 發送POST請求必須設置如下兩行
        conn.setDoOutput(true);
        conn.setDoInput(true);

        // 設置請求超時時間和讀取超時時間
        conn.setConnectTimeout(connTimeout == null ? 180 : connTimeout);
        conn.setReadTimeout(readTimeout == null ? 180 : readTimeout);

        // 獲取URLConnection對象對應的輸出流，設置utf-8編碼
        out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
        // 發送請求參數
        out.print(params);
        // flush輸出流的緩沖
        out.flush();
        // 定義BufferedReader輸入流來讀取URL的響應,設置utf-8編碼
        in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
        String line;
        while ((line = in.readLine()) != null)
            result += line;
    }
    catch (Exception e)
    {
        e.printStackTrace();
        result = null;
    }
    //使用finally塊來關閉輸出流、輸入流
    finally
    {
        try
        {
            if (out != null)
            {
                out.close();
            }
            if (in != null)
            {
                in.close();
            }
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }
    }
    return result;
}

兼容http請求和https請求的doPost方法

https請求繞過https驗證
具體見下方代碼

import javax.net.ssl.*;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

/**
 * Created by DawnHeaven on 16-4-20.
 */
public class PostUtils {
    /**
     * 忽視證書HostName
     */
    private static HostnameVerifier ignoreHostnameVerifier = new HostnameVerifier() {
        public boolean verify(String s, SSLSession sslsession) {
            //System.out.println("WARNING: Hostname is not matched for cert.");
            return true;
        }
    };

    /**
     * Ignore Certification
     */
    private static TrustManager ignoreCertificationTrustManger = new X509TrustManager() {
        private X509Certificate[] certificates;

        public void checkClientTrusted(X509Certificate certificates[],
                                       String authType) throws CertificateException {
            if (this.certificates == null) {
                this.certificates = certificates;
                //System.out.println("init at checkClientTrusted");
            }

        }

        public void checkServerTrusted(X509Certificate[] ax509certificate,
                                       String s) throws CertificateException {
            if (this.certificates == null) {
                this.certificates = ax509certificate;
                //System.out.println("init at checkServerTrusted");
            }
        }

        public X509Certificate[] getAcceptedIssuers() {
            // TODO Auto-generated method stub
            return null;
        }
    };

    /**
     * 獲取UrlConn
     */
    public static URLConnection geneUrlConn(String urlstr) throws Exception {
        URL url = new URL(urlstr);
        if(urlstr.startsWith("https://")){
            HttpsURLConnection.setDefaultHostnameVerifier(ignoreHostnameVerifier);
            HttpsURLConnection httpsConnection = (HttpsURLConnection) url.openConnection();

            // Prepare SSL Context
            TrustManager[] tm = { ignoreCertificationTrustManger };
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());


            // 從上述SSLContext對象中得到SSLSocketFactory對象
            SSLSocketFactory ssf = sslContext.getSocketFactory();
            httpsConnection.setSSLSocketFactory(ssf);

            return httpsConnection;
        }
        else {
            return  url.openConnection();
        }
    }



    /**
     * 發送POST請求
     *
     * @param url         請求地址url
     * @param params      需要發送的請求參數字符串
     * @param connTimeout 連接超時時間（毫秒），如果為null則默認為30秒
     * @param readTimeout 讀取超時時間（毫秒），如果為null則默認為60秒
     * @return 請求響應內容，如果為null則表示請求異常
     */
    public static String doPost(String url, String params, Integer connTimeout, Integer readTimeout, String contentType)
    {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try
        {
            //            URL realUrl = new URL(url);
            // 打開和URL之間的連接,根據url
            URLConnection conn = geneUrlConn(url);
            // 設置通用的請求屬性
            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", contentType == null? "application/json" : contentType);
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);

            // 設置請求超時時間和讀取超時時間
            conn.setConnectTimeout(connTimeout == null ? 180 : connTimeout);
            conn.setReadTimeout(readTimeout == null ? 180 : readTimeout);

            // 獲取URLConnection對象對應的輸出流
            out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
            // 發送請求參數
            out.print(params);
            // flush輸出流的緩沖
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
            String line;
            while ((line = in.readLine()) != null)
                result += line;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            result = null;
        }
        //使用finally塊來關閉輸出流、輸入流
        finally
        {
            try
            {
                if (out != null)
                {
                    out.close();
                }
                if (in != null)
                {
                    in.close();
                }
            }
            catch (IOException ex)
            {
                ex.printStackTrace();
            }
        }
        return result;
    }
}