java發送http和https請求(忽略證書)

通過java發送http請求和https請求
一、發送http請求

import java.io.*;
import java.net.URL;
import java.net.URLConnection;

public class HttpDemo{
    public static void main(String[] args) {
        String a="aaaa";//請求參數
        System.out.println(sendHttp(a));
    }

    public static String sendHttp(String a) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL("http://127.0.0.1:8080/openNozzle");
            // 打開和URL之間的連接
            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", "text/plain;charset=utf-8");
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection對象對應的輸出流
            // 獲取URLConnection對象對應的輸出流
            out = new OutputStreamWriter(conn.getOutputStream(), "utf-8");
            out.write(a);
            //錯誤方式，這種方式容易出現亂碼
            // PrintWriter out = new PrintWriter(connection.getOutputStream());  
            /*out.print(a);*/
            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) {
            System.out.println("發送 POST 請求出現異常！" + e);
            e.printStackTrace();
        }
        // 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;
    }
}

二、發送https請求(忽略證書)或http請求

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

public class PqTest {
    public static void main(String[] args) {
        String url="https://127.0.0.1:8080/openNozzle";
        String a = "aaaaaa";
        System.out.println(sendHtpps(a,url));
    }

    private final static HostnameVerifier DO_NOT_VERIFY = new HostnameVerifier() {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    };

    private static void trustAllHosts() {
        // Create a trust manager that does not validate certificate chains
        TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return new java.security.cert.X509Certificate[]{};
            }

            public void checkClientTrusted(X509Certificate[] chain, String authType) {
            }

            public void checkServerTrusted(X509Certificate[] chain, String authType) {
            }
        }};
        // Install the all-trusting trust manager
        try {
            SSLContext sc = SSLContext.getInstance("TLS");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String sendHtpps(String a,String url) {
        String result = "";
        PrintWriter out = null;
        BufferedReader in = null;
        HttpURLConnection conn;
        try {
            trustAllHosts();
            URL realUrl = new URL(url);
            //通過請求地址判斷請求類型(http或者是https)
            if (realUrl.getProtocol().toLowerCase().equals("https")) {
                HttpsURLConnection https = (HttpsURLConnection) realUrl.openConnection();
                https.setHostnameVerifier(DO_NOT_VERIFY);
                conn = https;
            } else {
                conn = (HttpURLConnection) 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", "text/plain;charset=utf-8");
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection對象對應的輸出流
            out = new OutputStreamWriter(conn.getOutputStream(), "utf-8");
            out.write(a);
            //錯誤方式，這種方式容易出現亂碼
            // PrintWriter out = new PrintWriter(connection.getOutputStream());  
            /*out.print(a);*/
            // flush輸出流的緩衝
            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();
        } finally {// 使用finally塊來關閉輸出流、輸入流
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }
}