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摘要：Java是如何實現和管理線程池的? 本文分享自華為雲社區《JUC線程池: ThreadPoolExecutor詳解》，作者：龍哥手記。帶著大廠的面試問題去理解提示請帶著這些問題繼續後文，會很大程度上幫助你更好的理解相關知識點。@pdai 為什麼要有線程池? Java是實現和管理線程池有 ...

1、安裝openssl

wget https://www.openssl.org/source/openssl-1.1.1b.tar.gz

./config --prefix=/usr/local/openssl --shared

--shared為添加動態庫，生成libssl.so，預設只有libssl.a靜態庫

make

make install

ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl

cp /usr/local/openssl/lib/openssl/libssl.so.1.1 /lib/x86_64-linux-gnu/

cp /usr/local/openssl/lib/openssl/libcrypto.so.1.1 /lib/x86_64-linux-gnu/

2、新建jni工程（eclipse為例）

新建java工程PemCheck

src下新建class com.jni.OpenSSLUtils.java

package com.jni;

public class OpenSSLUtils {
	public native static int checkPem(String pem,String key);
}

cd ${workspace}/PemCheck

javah -classpath . -d . com.jni.OpenSSLUtils

javah -jni com.jni.OpenSSLUtils

此時src下生成com_jni_OpenSSLUtils.h頭文件

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_jni_OpenSSLUtils */

#ifndef _Included_com_jni_OpenSSLUtils
#define _Included_com_jni_OpenSSLUtils
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_jni_OpenSSLUtils
 * Method:    checkPem
 * Signature: (Ljava/lang/String;Ljava/lang/String;)I
 */
JNIEXPORT jint JNICALL Java_com_jni_OpenSSLUtils_checkPem
  (JNIEnv *, jclass, jstring, jstring);

#ifdef __cplusplus
}
#endif
#endif

　3、新建C++工程（eclipse為例）

new project >> C++ Project >> ShardLibrary

設置編譯環境

include jdk的頭文件path

include jdk的頭文件 linux path

include openssl 頭文件path

編譯參數加上-fPIC

鏈接庫加上ssl,crypto

可以配置個命令將編譯後的so庫cp到測試或使用的工程路徑下

4、編寫openssl檢測代碼

新建src文件夾，將com_jni_OpenSSLUtils.h複製到該目錄下，

同時新建com_jni_OpenSSLUtils.cpp

#include "com_jni_OpenSSLUtils.h"
#include "openssl/pem.h"
#include "openssl/bio.h"
#include "openssl/ssl.h"

#include <iostream>

using namespace std; // @suppress("Symbol is not resolved")
/*
 * Class:     com_jni_OpenSSLUtils
 * Method:    checkPem
 * Signature: (Ljava/lang/String;Ljava/lang/String;)I
 */
JNIEXPORT jint JNICALL Java_com_jni_OpenSSLUtils_checkPem
  (JNIEnv *env, jclass jc, jstring pem, jstring key){
		BIO* keyBIO;
		EVP_PKEY* pkey;
		BIO* pemBIO = BIO_new_mem_buf(env->GetStringUTFChars(pem,0),-1);
		X509* cert = PEM_read_bio_X509(pemBIO,NULL,NULL,NULL);
	    if (cert == NULL) {
	    	cout << "PEM_read_bio_X509_AUX() failed" << endl;
	    	if(NULL != pemBIO)
	    	  BIO_free(pemBIO);
	    	return -1;
	    }
	    keyBIO = BIO_new_mem_buf(env->GetStringUTFChars(key,0),-1);
	    pkey = PEM_read_bio_PrivateKey(keyBIO,NULL,NULL,NULL);
	    if (pkey == NULL) {
	        	cout << "PEM_read_bio_PrivateKey() failed" << endl;
	        	if(NULL != cert)
	        		X509_free(cert);
	        	if(NULL != pemBIO)
	        		BIO_free(pemBIO);
	        	if(NULL != keyBIO)
	        		BIO_free(keyBIO);
	        	return -1;
	    }
	    SSL_library_init();
	    OpenSSL_add_all_algorithms();
	    SSL_load_error_strings();
	    SSL_CTX* ctx = SSL_CTX_new(SSLv23_client_method());
	    if (ctx == NULL) {
	    	cout << "ctx create failed" << endl;
        	goto bad;
	        }
	    if(SSL_CTX_use_certificate(ctx,cert)<=0){
	    	cout << "user certificate fail" << endl;
	    	goto bad;
	    }

	    if(SSL_CTX_use_PrivateKey(ctx,pkey) <=0){
	    	cout << "user key fail" << endl;
	    	goto bad;
	    }

	    if(!SSL_CTX_check_private_key(ctx)){
	    	cout << "key does not match the certificate" << endl;
	    	goto bad;
	    }
		if(NULL != pemBIO)
			BIO_free(pemBIO);
		if(NULL != keyBIO)
			BIO_free(keyBIO);
		if(NULL != pkey)
			EVP_PKEY_free(pkey);
		if(NULL != cert)
			X509_free(cert);
		if(NULL != ctx)
			SSL_CTX_free(ctx);
		return 0;

		bad:
			if(NULL != cert)
				X509_free(cert);
			if(NULL != pemBIO)
				BIO_free(pemBIO);
			if(NULL != keyBIO)
				BIO_free(keyBIO);
			if(NULL != pkey)
				EVP_PKEY_free(pkey);
			if(NULL != ctx)
				SSL_CTX_free(ctx);
			return -1;
	}

Build All.

5、測試

在java工程下新建Test 類

package com.jni;

public class Test {

	static {
		System.load("${solibpath}/libPemCheck.so");
	}
	
	public static void main(String[] args) {
		System.out.println(
		OpenSSLUtils.checkPem("-----BEGIN CERTIFICATE-----\n"
				+ "MIIDUDCCAjgCCQDcSSulgrGudTANBgkqhkiG9w0BAQsFADBqMQswCQYDVQQGEwJD\n"
				+ "TjERMA8GA1UECAwIWmhlamlhbmcxETAPBgNVBAcMCEhhbmd6aG91MQ4wDAYDVQQK\n"
				+ "DAVtb2ZlaTEOMAwGA1UECwwFbW9mZWkxFTATBgNVBAMMDHd3dy50ZXN0LmNvbTAe\n"
				+ "Fw0yMjEyMjEwNzMzNTVaFw0zMjEyMTgwNzMzNTVaMGoxCzAJBgNVBAYTAkNOMREw\n"
				+ "DwYDVQQIDAhaaGVqaWFuZzERMA8GA1UEBwwISGFuZ3pob3UxDjAMBgNVBAoMBW1v\n"
				+ "ZmVpMQ4wDAYDVQQLDAVtb2ZlaTEVMBMGA1UEAwwMd3d3LnRlc3QuY29tMIIBIjAN\n"
				+ "BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzqAHiN+76XHpcBIQKzT4+a7L/kI5\n"
				+ "cBeNr07Z0E/9zy9a0k5iVD+4boFk22yGPyoukGWZWnrK0yehAHG4WqEt5FKb8wms\n"
				+ "FEumnscPDmlq1jE+nuRfudUCyJU1PqdfkP4bI34ZKsgH9wiHONmqYAHJaAZtQTbn\n"
				+ "EfWszFEJ4Mjyv/WStN0YX3K2vUjzvvB891oR5YF6WblawG1EqK+qZKtNEOVA5mVQ\n"
				+ "YvTysbPd0dAV6VhDIcdagWSeF4y0f8BOlKrJyEKwiy6b/Mvl6ewf1/aRVF/qa4DV\n"
				+ "scQtg88TDKrmwaKJR4cSfo5JYDw8kkuuuFNazFkqlT6mcWeOrdx+awH1SwIDAQAB\n"
				+ "MA0GCSqGSIb3DQEBCwUAA4IBAQAab5Fl9DNimm3gXdhrOpo8+Gjy9OEon/jy16uF\n"
				+ "SyzOpo45U3r7rtkSSKuQOJZ5VDv3gtBKjVGhFSwbIEHAYVWg8qOliLq2LHAkWwFd\n"
				+ "eN0jVD2/cxjJMhQP7fbfYVLy7mHBp3zQ72uni3EzcjLYTc3Ly45TAko292MjTYcW\n"
				+ "uEkwp1NQiZklFnncXdJIx1vJ+TPweUi66iJk1FYJwkDcQV69GDLO9RnqMUsNHIRo\n"
				+ "q6JvvIBZ+VT8qY5TQ2nxHaWnN/55Iq/5gvZ1XI6J05oTughX0ojSRNfdzGVC8Yg2\n"
				+ "US8cG6NTgx8c1AFl1PA3vb8yGcgvESQIhS5tH60UOnVLVuT4\n"
				+ "-----END CERTIFICATE-----\n"
				+ "","-----BEGIN RSA PRIVATE KEY-----\n"
						+ "MIIEpAIBAAKCAQEAzqAHiN+76XHpcBIQKzT4+a7L/kI5cBeNr07Z0E/9zy9a0k5i\n"
						+ "VD+4boFk22yGPyoukGWZWnrK0yehAHG4WqEt5FKb8wmsFEumnscPDmlq1jE+nuRf\n"
						+ "udUCyJU1PqdfkP4bI34ZKsgH9wiHONmqYAHJaAZtQTbnEfWszFEJ4Mjyv/WStN0Y\n"
						+ "X3K2vUjzvvB891oR5YF6WblawG1EqK+qZKtNEOVA5mVQYvTysbPd0dAV6VhDIcda\n"
						+ "gWSeF4y0f8BOlKrJyEKwiy6b/Mvl6ewf1/aRVF/qa4DVscQtg88TDKrmwaKJR4cS\n"
						+ "fo5JYDw8kkuuuFNazFkqlT6mcWeOrdx+awH1SwIDAQABAoIBAG5Fub+yp/bOdGb7\n"
						+ "POXSP44BW502erD34QXObzBdgHcyLqZObuvHlgZjyA/Su1K6kF8/2bgQEG7gl2xF\n"
						+ "RL4ZhwRzkgcDAnNSbHoQgliOqhXl8iWae/wRUor6FpB5guc+tf0bLxNF7fpI8uHE\n"
						+ "SMk0Kuj5hRVo16keFDp2hW8Rz3vh/VysAjnNuG3Gofvk1TbuEeF15eaLv7k+rZJV\n"
						+ "KoFQ9cbTZD7LZPifimqBjuhCQVpsEfi8vbHidg+W7i+zt5L6e2o2Nc8X4CJE3vAs\n"
						+ "MNGkyxrgR5M+uneOz4+WsuNxwx6YiIPXKYr+kOJvze7sAV0OYNtJVwFHzvmxfQ79\n"
						+ "0XqtxQECgYEA99vSozDexH5Fh7SG+GlTFgzlw4BrmHUv2DyRpXz+ceJdfokHXFfX\n"
						+ "SRCkH0axFQ2U60Iyv/W9oACXtKFHfLOj/fPczA0w7661rF1ANHmrMcodMdE27FcU\n"
						+ "joGe0d2Wj2SnGr4JtqxnZDS/GFJfwQxTpLEI0js6eaK1PRi/krFzB80CgYEA1Wl8\n"
						+ "D7kePEq7KujegF6w9hx5du708c21/usLEhdBLmOhcTE4N3f+fUnYSG0D/3o68BRn\n"
						+ "8CmDkUfQPltLy/l8vJI4OE2kUxxlYa5RRRbvHX47cUHxRuDTK40Ip1iAgHc/EZRE\n"
						+ "HJD65HW7FuiaTSqYb8VIA3ywcLg1UGhqNY7vqXcCgYEAwy3/uTKKugEVj7/BaWzH\n"
						+ "WN3fMQy3rd7aRlWr+71qQRQYu8P8X+NsTMUl+NsaJ5ICayA+BpvlL1JIJJ28RZ7Q\n"
						+ "zPJ0NNtOZfAWcB0eqjQFc7fNNaWisooAThgUkP8FyPViAdUUoR0ybd57fROhA8xJ\n"
						+ "Ma+XWrX5Xj+aqPoMIeBKzSECgYAhLdYw55nwy7mPsUaudIpUqRalS/9e/Jl3+Xju\n"
						+ "JhlnKew2me1gilJRjkKG+BPwC0PQgYurRfkDhEO2/iCppK8k7iK5djC/DyIf7qcJ\n"
						+ "88fXMQHy2Mq3N0r9cV7QDa1ky6VNiVyRiGTJUhh1NlKO/rlWXziT+jXAQJNhXept\n"
						+ "SzytfwKBgQC72ceWLWFBo0uAVPWmxFtOKVUZOY2tN3FwLUQkEt52F+VU2vhrKnpu\n"
						+ "Ja+CRxA0ZycKg8EDYpJA+xFc7GBWZtsfI2iEN2/gH1x96sctmGbyJec9Ws36RqPb\n"
						+ "VgXM+Y6VobyMIOKyJzs/Upz5+3btRToAfUJw5wnThh9zOAIM+VGNxg==\n"
						+ "-----END RSA PRIVATE KEY-----"));
	}
}