update at 2022-02-22 20:29:33 by ehlxr

2022-02-22 20:29:33 +08:00 · 2022-02-22 20:29:33 +08:00 · f624b2eb80
commit f624b2eb80
6 changed files with 252 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,2 @@
+mylib/target
+**/.class
--- a/README.md
+++ b/README.md
@ -0,0 +1,23 @@
+Rust build
+
+```shell
+cd mylib
+cargo build
+```
+
+Java build
+
+```shell
+cd java_src
+javac me/ehlxr/HelloWorld.java
+```
+
+Run Java
+```shell
+cd java_src
+
+// Linux: export LD_LIBRARY_PATH=../mylib/target/debug/
+export JAVA_LIBRARY_PATH=../mylib/target/debug/
+
+java me.ehlxr.HelloWorld
+```
--- a/java_src/me/ehlxr/HelloWorld.java
+++ b/java_src/me/ehlxr/HelloWorld.java
@ -0,0 +1,15 @@
+package me.ehlxr;
+
+public class HelloWorld {
+    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
+        System.loadLibrary("mylib");
+    }
+    private static native String hello(String input);
+
+    public static void main(String[] args) {
+        String output = HelloWorld.hello("Java");
+        System.out.println(output);
+    }
+}
--- a/mylib/Cargo.lock
+++ b/mylib/Cargo.lock
@ -0,0 +1,179 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
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+name = "bytes"
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+
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+checksum = "50b727aacc797f9fc28e355d21f34709ac4fc9adecfe470ad07b8f4464f53062"
+dependencies = [
+ "bytes",
+ "memchr",
+]
+
+[[package]]
+name = "jni"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c6df18c2e3db7e453d3c6ac5b3e9d5182664d28788126d39b91f2d1e22b017ec"
+dependencies = [
+ "cesu8",
+ "combine",
+ "jni-sys",
+ "log",
+ "thiserror",
+ "walkdir",
+]
+
+[[package]]
+name = "jni-sys"
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+
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+checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "memchr"
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+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+
+[[package]]
+name = "mylib"
+version = "0.1.0"
+dependencies = [
+ "jni",
+]
+
+[[package]]
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+ "unicode-xid",
+]
+
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+dependencies = [
+ "proc-macro2",
+]
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+[[package]]
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+ "quote",
+ "unicode-xid",
+]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-xid"
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+
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+dependencies = [
+ "same-file",
+ "winapi",
+ "winapi-util",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
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+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
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+
+[[package]]
+name = "winapi-util"
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+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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--- a/mylib/Cargo.toml
+++ b/mylib/Cargo.toml
@ -0,0 +1,12 @@
+[package]
+name = "mylib"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+jni = "0.19.0"
+
+[lib]
+crate_type = ["cdylib"]
--- a/mylib/src/lib.rs
+++ b/mylib/src/lib.rs
@ -0,0 +1,21 @@
+use jni::objects::{JClass, JString};
+use jni::sys::jstring;
+use jni::JNIEnv;
+
+#[no_mangle]
+pub extern "system" fn Java_me_ehlxr_HelloWorld_hello(
+    env: JNIEnv,
+    _class: JClass,
+    input: JString,
+) -> jstring {
+    let input: String = env
+        .get_string(input)
+        .expect("Couldn't get java string!")
+        .into();
+
+    let output = env
+        .new_string(format!("Hello, {}! from Rust...111", input))
+        .expect("Couldn't create java string!");
+
+    output.into_inner()
+}