提交示例

.gitignore

@@ -0,0 +1,3 @@
+target/
+.idea/
+*.iml

java/src/HelloWorld.java

@@ -0,0 +1,13 @@
+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);
+    }
+}

native/mylib/.gitignore

@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk

native/mylib/Cargo.lock

@@ -0,0 +1,210 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "ascii"
+version = "0.9.2"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "backtrace"
+version = "0.3.33"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "backtrace-sys 0.1.31 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "cfg-if 0.1.9 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "libc 0.2.60 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "rustc-demangle 0.1.15 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.31"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "cc 1.0.37 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "libc 0.2.60 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "byteorder"
+version = "1.3.2"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "cc"
+version = "1.0.37"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "cesu8"
+version = "1.1.0"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "cfg-if"
+version = "0.1.9"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "combine"
+version = "3.8.1"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "ascii 0.9.2 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "byteorder 1.3.2 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "either 1.5.2 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "memchr 2.2.1 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "unreachable 1.0.0 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "either"
+version = "1.5.2"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "error-chain"
+version = "0.12.1"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "backtrace 0.3.33 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "version_check 0.1.5 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "jni"
+version = "0.13.0"
+source = "git+https://github.com/prevoty/jni-rs#ceeec77366816eec42536fc2ed27c8571a62535e"
+dependencies = [
+ "cesu8 1.1.0 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "combine 3.8.1 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "error-chain 0.12.1 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "jni-sys 0.3.0 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "log 0.4.7 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "walkdir 2.2.9 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "jni-sys"
+version = "0.3.0"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "libc"
+version = "0.2.60"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "log"
+version = "0.4.7"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "cfg-if 0.1.9 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "memchr"
+version = "2.2.1"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "mylib"
+version = "0.1.0"
+dependencies = [
+ "jni 0.13.0 (git+https://github.com/prevoty/jni-rs)",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.15"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "same-file"
+version = "1.0.5"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "winapi-util 0.1.2 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "unreachable"
+version = "1.0.0"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "void 1.0.2 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "version_check"
+version = "0.1.5"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "walkdir"
+version = "2.2.9"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
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+ "winapi 0.3.7 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+ "winapi-util 0.1.2 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
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+version = "0.3.7"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
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+ "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.2"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+dependencies = [
+ "winapi 0.3.7 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://mirrors.ustc.edu.cn/crates.io-index/"
+
+[metadata]
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+"checksum cc 1.0.37 (registry+https://mirrors.ustc.edu.cn/crates.io-index/)" = "39f75544d7bbaf57560d2168f28fd649ff9c76153874db88bdbdfd839b1a7e7d"
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native/mylib/Cargo.toml

@@ -0,0 +1,13 @@
+[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"]

native/mylib/src/lib.rs

@@ -0,0 +1,36 @@
+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()
+}