ehlxr/jni_rs
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update at 2022-02-23 20:37:36 by ehlxr

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This commit is contained in:
ehlxr 2022-02-23 20:37:36 +08:00
parent ed1ac08fe6
commit 53521e036f
2 changed files with 53 additions and 19 deletions
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46
java_src/me/ehlxr/HelloWorld.java
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@ -4,13 +4,13 @@ class HelloWorld {
private static native String hello(String input);
private static native byte[] helloByte(byte[] input);
private static native void factAndCallMeBack(int n, HelloWorld callback);
private static native long counterNew(HelloWorld callback);
private static native void counterIncrement(long counter_ptr);
private static native void counterDestroy(long counter_ptr);
private static native void asyncComputation(HelloWorld callback);
private static native String fetchNameStr(HelloWorld param);
static {
// Linux: export LD_LIBRARY_PATH=/Users/ehlxr/Desktop/jni_rs/mylib/target/debug
// Mac: export JAVA_LIBRARY_PATH=/Users/ehlxr/Desktop/jni_rs/mylib/target/debug
@ -18,23 +18,41 @@ class HelloWorld {
}
public static void main(String[] args) {
String output = HelloWorld.hello("Java");
System.out.println(output);
byte[] outputByte = HelloWorld.helloByte("byte".getBytes());
System.out.println(outputByte);
// String output = HelloWorld.hello("Java");
// System.out.println(output);
HelloWorld.factAndCallMeBack(6, new HelloWorld());
// byte[] outputByte = HelloWorld.helloByte("byte".getBytes());
// System.out.println(outputByte);
long counter_ptr = counterNew(new HelloWorld());
// HelloWorld.factAndCallMeBack(6, new HelloWorld());
for (int i = 0; i < 5; i++) {
counterIncrement(counter_ptr);
}
// long counter_ptr = counterNew(new HelloWorld());
counterDestroy(counter_ptr);
// for (int i = 0; i < 5; i++) {
// counterIncrement(counter_ptr);
// }
System.out.println("Invoking asyncComputation (thread id = " + Thread.currentThread().getId() + ")");
asyncComputation(new HelloWorld());
// counterDestroy(counter_ptr);
// System.out.println("Invoking asyncComputation (thread id = " + Thread.currentThread().getId() + ")");
// asyncComputation(new HelloWorld());
HelloWorld hw = new HelloWorld();
// hw.setNameStr("fsdfs");
System.out.println(HelloWorld.fetchNameStr(hw));
}
private String nameStr;
public void setNameStr(String nameStr){
System.out.println(nameStr);
// this.nameStr=nameStr;
}
public String getNameStr(){
return nameStr;
}
public void factCallback(int res) {

26
mylib/src/lib.rs
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@ -1,11 +1,27 @@
use jni::JNIEnv;
use jni::objects::{GlobalRef, JClass, JObject, JString};
use jni::objects::{GlobalRef, JClass, JObject, JString, JValue};
use jni::sys::{jbyteArray, jint, jlong, jstring};
use jni::JNIEnv;
use std::{sync::mpsc, thread, time::Duration};
#[no_mangle]
pub extern "system" fn Java_me_ehlxr_HelloWorld_fetchNameStr(
env: JNIEnv,
_class: JClass,
input: JObject,
) -> jstring {
if let JValue::Object(rt) = env
.call_method(input, "getNameStr", "()Ljava/lang/String;", &[])
.unwrap()
{
println!("return {:?}", rt)
};
let output = env
.new_string(format!("Hello, {:?}! from Rust..", input))
.expect("Couldn't create java string!");
output.into_inner()
}
#[no_mangle]
pub extern "system" fn Java_me_ehlxr_HelloWorld_hello(
env: JNIEnv,