涓€銆佸紑绡囨毚鍑伙細浣犵殑Java绋嬪簭鏄笉鏄湪瑁稿锛?/h3>

鏈夋病鏈夌粡鍘嗚繃杩欑鎶撶媯鏃跺埢锛熺敤Java澶勭悊4K瑙嗛鍍忓湪鐪嬭繛鐜敾锛岃绠楁枑娉㈤偅濂戞暟鍒楃畻鍒版墜鏈哄彂鐑?..杩欐椂鍊欏氨璇ヨ鍑烘湰鍦版柟娉曡繖涓鎸備簡锛佷絾鎬庝箞璁㎎ava鍜孋++杩欏璺ㄥ浗CP楂樻晥鍚堜綔锛熶粖澶╁挶浠氨鎺板紑鎻夌浜嗚亰锛?/p>

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浜屻€佹悶瀵硅薄鍏堢湅鑴革細JNI杩樻槸JNA锛?/h3>

鈥?strong>鈥?閫夊瀷绾犵粨鐥囧繀鐪嬧€?/strong>鈥?br/> 杩欎咯璐у氨鍍忕浉浜插競鍦虹殑鐩寸敺鍜屾殩鐢凤細

• 鈥?strong>鈥婮NI鈥?/strong>鈥嬶細閽㈤搧鐩寸敺锛岄渶瑕佷綘鎵嬪姩鍐機++浠ｇ爜锛屼絾鎬ц兘鐐歌锛堝疄娴嬫瘮绾疛ava蹇?-8鍊嶏級
• 鈥?strong>鈥婮NA鈥?/strong>鈥嬶細涓ぎ绌鸿皟锛屽彧瑕佸畾涔夋帴鍙ｅ氨鑳借皟鐢紝浠ｄ环鏄€熷害鎵撳叓鎶?/li>

涓句釜鏍楀瓙馃尠锛氬鐞嗕竴寮?K鍥剧墖

鏂规	浠ｇ爜閲?/th>	鎵ц鏃堕棿	鍐呭瓨鍗犵敤
绾疛ava	200琛?/td>	1.2绉?/td>	350MB
JNI	300琛?/td>	0.3绉?/td>	180MB
JNA	50琛?/td>	0.5绉?/td>	220MB

鐪嬪埌娌★紵鎯宠閫熷害灏卞緱浠樺嚭鐐逛唬浠凤紒

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涓夈€佹墜鎶婃墜鏁欏锛氫粠闈掗摐鍒扮帇鑰?/h3>

鈥?strong>鈥?瓒呰缁嗕繚濮嗙骇鏁欑▼鈥?/strong>鈥?/p>

1. 鈥?strong>鈥嬬幆澧冩惌寤轰笁浠跺鈥?/strong>鈥?/p>

   • 瀹夎JDK鏃惰寰楀嬀閫?婧愮爜"锛堝埆闂负鍟ワ紝鍚庨潰浼氳阿鎴戯級
   • 閰嶇疆NDK璺緞鍒敤涓枃锛堣鐨勬暀璁紒锛?/li>
   • CMake鐗堟湰瑕佲墺3.10锛堣€佺増鏈鏄撶炕杞︼級

2. 鈥?strong>鈥嬬涓€涓狧elloWorld鈥?/strong>鈥?br/> Java绔細

java澶嶅埗
public class NativeDemo {
    public native String sayHi(); // 杩欎釜native灏辨槸鎺ュご鏆楀彿
    static {
        System.loadLibrary("hello"); // 鍔犺浇浣犵殑鐖辨儏缁撴櫠
    }
}

C++绔細

cpp澶嶅埗
#include 
extern "C" JNIEXPORT jstring JNICALL Java_NativeDemo_sayHi(JNIEnv* env, jobject) {
    return env->NewStringUTF("绾﹀悧锛?); // 杩欓噷鍗冧竾娉ㄦ剰缂栫爜锛?/span>
}

1. 鈥?strong>鈥嬬紪璇戠巹瀛︾幇鍦衡€?/strong>鈥?/li>

bash澶嶅埗
# Windows鐜╁鐪嬭繖閲?/span>
cl /EHsc /I"%JAVA_HOME%\include" /I"%JAVA_HOME%\include\win32" hello.cpp /LD

# Linux/Mac鍏氭暡杩欎釜
g++ -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux" -shared -o libhello.so hello.cpp

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鍥涖€佹€ц兘椋欒溅绉樼睄

鈥?strong>鈥?鑰佸徃鏈轰笓灞炰紭鍖栧寘鈥?/strong>鈥?/p>

1. 鈥?strong>鈥嬪噺灏戣法璇█璋冪敤鐨勫Э鍔库€?/strong>鈥?br/> 鎶婂娆¤皟鐢ㄦ墦鍖呮垚涓€娆★紝灏卞儚缃戣喘鍑戞弧鍑忥細

java澶嶅埗
// 闈掗摐鎿嶄綔
for(int i=0; i<1000; i++) {
    nativeProcess(data[i]);
}

// 鐜嬭€呮搷浣?/span>
nativeBatchProcess(data); // 涓€娆″鐞嗘暣涓暟缁?/span>

1. 鈥?strong>鈥嬪唴瀛樼鐞嗙殑楠氭搷浣溾€?/strong>鈥?br/> 鐢―irectByteBuffer閬垮厤鏁版嵁鎷疯礉锛?/li>

java澶嶅埗
ByteBuffer buffer = ByteBuffer.allocateDirect(1024 * 1024); // 鐩存帴鐢宠C++鑳借鐨勫唴瀛?/span>
nativeProcess(buffer);

1. 鈥?strong>鈥嬬紦瀛樺ぇ娉曞ソ鈥?/strong>鈥?br/> 鎻愬墠缂撳瓨鏂规硶ID鍜岀被寮曠敤锛?/li>

cpp澶嶅埗
// 鍒濆鍖栨椂缂撳瓨
jclass cls = env->FindClass("com/example/NativeDemo");
jmethodID mid = env->GetMethodID(cls, "callback", "(I)V");

// 浣跨敤鏃剁洿鎺ヨ皟鐢?/span>
env->CallVoidMethod(obj, mid, 666);

浜斻€侀伩鍧戞寚鍗楋細琛€鐨勬暀璁?/h3>

鈥?strong>鈥?鏂版墜蹇呯湅鐨勭炕杞︾幇鍦衡€?/strong>鈥?/p>

1. 鈥?strong>鈥嬪唴瀛樻硠婕忚繛鐜偢鈥?/strong>鈥?br/> 鍦–++閲宯ew鐨勫璞′竴瀹氳delete锛丣NI鍏ㄥ眬寮曠敤鐢ㄥ畬瑕丏eleteGlobalRef锛?/p>

2. 鈥?strong>鈥嬬嚎绋嬪畨鍏ㄧ殑楠氭搷浣溾€?/strong>鈥?br/> 鍦ㄥ瓙绾跨▼璋冪敤JNI鏃讹紝璁板緱鍏圓ttachCurrentThread锛?/p>

cpp澶嶅埗
JNIEnv* env;
vm->AttachCurrentThread(&env, NULL); // 涓婅溅瑕佷拱绁?/span>
// 浣犵殑楠氭搷浣?/span>
vm->DetachCurrentThread(); // 涓嬭溅鍒繕缁欓挶

1. 鈥?strong>鈥嬬被鍨嬭浆鎹㈢殑鏆楅浄鈥?/strong>鈥?br/> Java鐨刲ong鍦–++鏄痡long锛?4浣嶏級锛屼絾鏈変簺绯荤粺long鍙湁32浣嶏紒杩欐椂鍊欒鐢╥nt64_t淇濆钩瀹夈€?/li>

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鐙鏁版嵁澶ф斁閫?/h3>

鍘诲勾缁欐煇鐩存挱App鍋氫紭鍖栵紝鎶婄編棰滄护闀滀粠Java绉绘鍒癑NI锛?/p>

• 甯х巼浠?2fps椋欏崌鍒?0fps
• 鎵嬫満娓╁害浠?8鈩冮檷鍒?9鈩?/li>
• 鍐呭瓨鍗犵敤鍑忓皯42%
  浣嗕唬浠锋槸寮€鍙戞椂闂村鍔犱簡3鍛ㄢ€斺€旇繖娉㈠€间笉鍊硷紵鐪嬩綘鏄蹇€熶笂绾胯繕鏄拷姹傛瀬鑷翠綋楠屼簡锛?/li>

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鏈€鍚庤鍙ュ緱缃汉鐨?/h3>

瑙佽繃澶鍥㈤槦鍦↗NI涓婄炕杞︼紝鏍规湰鍘熷洜灏变竴涓細鎶婃湰鍦版柟娉曞綋涓囪兘鑽紒鍏跺疄90%鐨勫満鏅敤Java閮借兘鎼炲畾锛屽彧鏈夌鍒板瘑闆嗚绠椼€佺‖浠舵搷浣溿€佸凡鏈塁++搴撹繖涓夌鎯呭喌鎵嶅€煎緱涓奐NI銆傝浣忥紝璺ㄨ瑷€璋冪敤灏卞儚璺ㄥ浗濠氬Щ锛岄渶瑕佹洿澶氱悊瑙ｅ拰濡ュ崗锛?/p>