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rust-jni-demo
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richie 5 years ago
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  1. 3
      .gitignore
  2. 13
      java/src/HelloWorld.java
  3. 2
      native/mylib/.gitignore
  4. 210
      native/mylib/Cargo.lock
  5. 13
      native/mylib/Cargo.toml
  6. 36
      native/mylib/src/lib.rs

3
.gitignore vendored
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target/
.idea/
*.iml

13
java/src/HelloWorld.java
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class HelloWorld {
private static native String hello(String input);
static {
String dir = System.getProperty("user.dir");
System.load(dir + "/native/mylib/target/debug/libmylib.dylib");
}
public static void main(String[] args) {
String output = HelloWorld.hello("fanruan");
System.out.println(output);
}
}

2
native/mylib/.gitignore vendored
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/target
**/*.rs.bk

210
native/mylib/Cargo.lock generated
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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13
native/mylib/Cargo.toml
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[package]
name = "mylib"
version = "0.1.0"
authors = ["richie <richie@fanruan.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
jni = { git = "https://github.com/prevoty/jni-rs" }
[lib]
crate_type = ["dylib"]

36
native/mylib/src/lib.rs
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extern crate jni;
// This is the interface to the JVM that we'll call the majority of our
// methods on.
use jni::JNIEnv;
// These objects are what you should use as arguments to your native
// function. They carry extra lifetime information to prevent them escaping
// this context and getting used after being GC'd.
use jni::objects::{JClass, JString};
// This is just a pointer. We'll be returning it from our function. We
// can't return one of the objects with lifetime information because the
// lifetime checker won't let us.
use jni::sys::jstring;
// This keeps rust from "mangling" the name and making it unique for this
// crate.
#[no_mangle]
// This turns off linter warnings because the name doesn't conform to
// conventions.
#[allow(non_snake_case)]
pub extern "system" fn Java_HelloWorld_hello(env: JNIEnv,
// This is the class that owns our static method. It's not going to be used,
// but still must be present to match the expected signature of a static
// native method.
class: JClass,
input: JString)
-> jstring {
// First, we have to get the string out of java. Check out the `strings`
// module for more info on how this works.
let input: String =
env.get_string(input).expect("Couldn't get java string!").into();
// Then we have to create a new java string to return. Again, more info
// in the `strings` module.
let output = env.new_string(format!("Hello, {}!", input))
.expect("Couldn't create java string!");
// Finally, extract the raw pointer to return.
output.into_inner()
}
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