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Rust JNI example

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Michael Pfaff 2 months ago
parent
commit
f14cc75798
Signed by: michael GPG Key ID: F1A27427218FCA77
  1. 1
      .gitignore
  2. 179
      Cargo.lock
  3. 13
      Cargo.toml
  4. 13
      java/src/main/HelloWorld.java
  5. 14
      src/lib.rs

1
.gitignore

@ -0,0 +1 @@
/target

179
Cargo.lock

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
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13
Cargo.toml

@ -0,0 +1,13 @@
[package]
name = "bedrock"
version = "0.1.0"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[lib]
crate_type = ["cdylib"]
[dependencies]
jni = "0.19.0"

13
java/src/main/HelloWorld.java

@ -0,0 +1,13 @@
class HelloWorld {
private static native String hello(String input);
static {
System.loadLibrary("bedrock");
}
// The rest is just regular ol' Java!
public static void main(String[] args) {
String output = HelloWorld.hello("josh");
System.out.println(output);
}
}

14
src/lib.rs

@ -0,0 +1,14 @@
use jni::JNIEnv;
use jni::objects::{JClass, JString};
use jni::sys::jstring;
#[no_mangle]
pub extern "system" fn Java_HelloWorld_hello(env: JNIEnv, _class: JClass, input: JString) -> jstring {
let input: String = env.get_string(input).unwrap().into();
let output = env.new_string(format!("Hello, {}!", input)).unwrap();
output.into_inner()
}
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