本文讲解
不使用javah命令怎么将.java文件生成相对应的.h文件
首先看看签名表
| java类型 | 类型签名 |
|---|---|
| byte | B |
| short | S |
| int | I |
| long | J |
| float | F |
| double | D |
| char | C |
| boolean | Z |
| void | V |
| 数组 | 例如：int[]签名为：[I |
| 类 | L全限定名;，比如String, 其签名为Ljava/lang/String;(注意后面有个分号) |
| _ | _1 |
| / | _ |
| ; | _2 |
| [ | _3 |
例子（主要为同名函数的类型签名）
java代码
public class TestJni
{
/*验证同名函数*/
public native long print(byte b,int i);
public native long print(long l, double d);
/*验证下划线*/
public native void print_m();
public native void print_m(long m);
/*验证"/"和";"*/
public native int print();
public native short print(String s);
}
生成的h头文件（代码中有注释说明）
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class TestJni */
#ifndef _Included_TestJni
#define _Included_TestJni
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: TestJni
* Method: print
* Signature: (BI)J
*/
/*BI分别表示参数byte,int的签名*/
JNIEXPORT jlong JNICALL Java_TestJni_print__BI
(JNIEnv *, jobject, jbyte, jint);
/*
* Class: TestJni
* Method: print
* Signature: (JD)J
*/
/*JD分别表示参数long,double的签名*/
JNIEXPORT jlong JNICALL Java_TestJni_print__JD
(JNIEnv *, jobject, jlong, jdouble);
/*
* Class: TestJni
* Method: print_m
* Signature: ()V
*/
/*_1表示_的签名*/
JNIEXPORT void JNICALL Java_TestJni_print_1m__
(JNIEnv *, jobject);
/*
* Class: TestJni
* Method: print_m
* Signature: (J)V
*/
JNIEXPORT void JNICALL Java_TestJni_print_1m__J
(JNIEnv *, jobject, jlong);
/*
* Class: TestJni
* Method: print
* Signature: ()I
*/
JNIEXPORT jint JNICALL Java_TestJni_print__
(JNIEnv *, jobject);
/*
* Class: TestJni
* Method: print
* Signature: (Ljava/lang/String;)S
*/
/*Ljava/lang/String;表示String的签名，然后在函数中"/"变成"_"，";"变成"_2"*/
JNIEXPORT jshort JNICALL Java_TestJni_print__Ljava_lang_String_2
(JNIEnv *, jobject, jstring);
#ifdef __cplusplus
}
#endif
#endif
