增加jni 样例测试 (#5)

Reviewed-on: #5

.gitignore

@@ -47,4 +47,5 @@ replay_pid*
 
 .idea
 target
+*.o
 

pom.xml

@@ -36,4 +36,29 @@
             <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>

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");
+    }
+
+}

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/

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

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