From 1e634c22d25bc6fd685716513aaaac59c4cd75f2 Mon Sep 17 00:00:00 2001
From: zeekling <lingzhaohui@zeekling.cn>
Date: Sun, 31 Dec 2023 06:55:24 +0000
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0jni=20=E6=A0=B7=E4=BE=8B?=
 =?UTF-8?q?=E6=B5=8B=E8=AF=95=20(#5)?=
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Reviewed-on: https://git.zeekling.cn/java/java_test/pulls/5
---
 .gitignore                                    |  1 +
 pom.xml                                       | 85 ++++++++++++-------
 .../java/com/zeekling/cn/jni/JniTest.java     | 25 ++++++
 src/main/native/build.sh                      | 13 +++
 src/main/native/com_zeekling_cn_jni_JniTest.h | 21 +++++
 src/main/native/jniTestNative.c               | 27 ++++++
 6 files changed, 142 insertions(+), 30 deletions(-)
 create mode 100644 src/main/java/com/zeekling/cn/jni/JniTest.java
 create mode 100755 src/main/native/build.sh
 create mode 100644 src/main/native/com_zeekling_cn_jni_JniTest.h
 create mode 100644 src/main/native/jniTestNative.c

diff --git a/.gitignore b/.gitignore
index 4c2add1..b85849e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,4 +47,5 @@ replay_pid*
 
 .idea
 target
+*.o
 
diff --git a/pom.xml b/pom.xml
index e1ff747..81324a5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,39 +1,64 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
 
-  <groupId>com.zeekling.cn</groupId>
-  <artifactId>test</artifactId>
-  <version>1.0-SNAPSHOT</version>
-  <packaging>jar</packaging>
+    <groupId>com.zeekling.cn</groupId>
+    <artifactId>test</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
 
-  <name>java_test</name>
+    <name>java_test</name>
 
-  <properties>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
-  </properties>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
 
-  <dependencies>
+    <dependencies>
 
-    <dependency>
-      <groupId>org.rocksdb</groupId>
-      <artifactId>rocksdbjni</artifactId>
-      <version>6.20.3</version>
-    </dependency>
+        <dependency>
+            <groupId>org.rocksdb</groupId>
+            <artifactId>rocksdbjni</artifactId>
+            <version>6.20.3</version>
+        </dependency>
 
-    <dependency>
-      <groupId>org.apache.hadoop</groupId>
-      <artifactId>hadoop-common</artifactId>
-      <version>3.3.6</version>
-    </dependency>
+        <dependency>
+            <groupId>org.apache.hadoop</groupId>
+            <artifactId>hadoop-common</artifactId>
+            <version>3.3.6</version>
+        </dependency>
 
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>4.13.2</version>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>exec-maven-plugin</artifactId>
+                <groupId>org.codehaus.mojo</groupId>
+                <version>3.1.1</version>
+                <executions>
+                    <execution>
+                        <id>uncompress</id>
+                        <phase>install</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <executable>${basedir}/src/main/native/build.sh</executable>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+            </plugin>
+        </plugins>
+    </build>
 </project>
diff --git a/src/main/java/com/zeekling/cn/jni/JniTest.java b/src/main/java/com/zeekling/cn/jni/JniTest.java
new file mode 100644
index 0000000..ef251ff
--- /dev/null
+++ b/src/main/java/com/zeekling/cn/jni/JniTest.java
@@ -0,0 +1,25 @@
+package com.zeekling.cn.jni;
+
+/**
+ * javac -encoding utf8 -h . JniTest.java
+ * gcc -I$JAVA_HOME/include -I$JAVA_HOME/include/linux -fPIC -shared jniTestNative.c -o libJniTestNative.so
+ */
+public class JniTest {
+
+    /**
+     * native关键字,表明这个方法使用java以外的语言实现
+     */
+    public native void say(String something);
+
+
+    static {
+        //加载jni库so
+        System.load(JniTest.class.getResource("/libJniTestNative.so").getPath());
+    }
+
+    public static void main(String[] args) {
+        //运行后，控制台打印出 hello world
+        new JniTest().say("hello world");
+    }
+
+}
diff --git a/src/main/native/build.sh b/src/main/native/build.sh
new file mode 100755
index 0000000..ed303da
--- /dev/null
+++ b/src/main/native/build.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+if [ -z "$JAVA_HOME" ]; then
+   JAVA_HOME="/opt/bisheng-jdk-17.0.3"
+fi
+echo "$JAVA_HOME"
+basedir=$(pwd)
+cd "$basedir/src/main/native/"
+gcc -I$JAVA_HOME/include -I$JAVA_HOME/include/linux -fPIC -shared jniTestNative.c -o libJniTestNative.so
+
+echo "$(pwd)"
+
+mv libJniTestNative.so ${basedir}/target/classes/
\ No newline at end of file
diff --git a/src/main/native/com_zeekling_cn_jni_JniTest.h b/src/main/native/com_zeekling_cn_jni_JniTest.h
new file mode 100644
index 0000000..69c8ce9
--- /dev/null
+++ b/src/main/native/com_zeekling_cn_jni_JniTest.h
@@ -0,0 +1,21 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class com_zeekling_cn_jni_JniTest */
+
+#ifndef _Included_com_zeekling_cn_jni_JniTest
+#define _Included_com_zeekling_cn_jni_JniTest
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_zeekling_cn_jni_JniTest
+ * Method:    say
+ * Signature: (Ljava/lang/String;)V
+ */
+JNIEXPORT void JNICALL Java_com_zeekling_cn_jni_JniTest_say
+  (JNIEnv *, jobject, jstring);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/src/main/native/jniTestNative.c b/src/main/native/jniTestNative.c
new file mode 100644
index 0000000..12368dc
--- /dev/null
+++ b/src/main/native/jniTestNative.c
@@ -0,0 +1,27 @@
+#include "com_zeekling_cn_jni_JniTest.h"
+#include <stdio.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_zeekling_cn_jni_JniTest
+ * Method:    say
+ * Signature: (Ljava/lang/String;)V
+ */
+JNIEXPORT void JNICALL Java_com_zeekling_cn_jni_JniTest_say(JNIEnv* env, jclass cls,  jstring j_str) {
+    const char *c_str = NULL;
+    char buff[128] = { 0 };
+    c_str = (*env)->GetStringUTFChars(env, j_str, NULL);
+    if (c_str == NULL)
+    {
+        printf("out of memory.\n");
+        return NULL;
+    }
+    (*env)->ReleaseStringUTFChars(env, j_str, c_str);
+    printf("Hello,I'm C++,the Java Str is:%s\n", c_str);
+    sprintf(buff, "hello %s", c_str);
+    return (*env)->NewStringUTF(env, buff);
+}
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file