Initial commit

pom.xml

+<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>
+
+  <groupId>com.paul0523</groupId>
+  <artifactId>java-jni-test</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>java-jni-test</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.6.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

src/main/java/com/paul0523/HelloWorld.java

+package com.paul0523;
+
+import java.io.IOException;
+import java.lang.reflect.Field;
+
+public class HelloWorld{
+    public native void hello();
+
+    static {
+        try {
+            //设置查找路径为当前项目路径,注意直接设置java.library.path属性无效
+            addDir("/Users/fangzhipeng/Documents/workspace-idea/java-jni-test/lib");
+            //加载动态库的名称
+            System.loadLibrary("hello");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+    }
+
+    public static void main(String[] args){
+        new HelloWorld().hello();
+    }
+
+    public static void addDir(String s) throws IOException {
+        try {
+            Field field = ClassLoader.class.getDeclaredField("usr_paths");
+            field.setAccessible(true);
+            String[] paths = (String[])field.get(null);
+            for (int i = 0; i < paths.length; i++) {
+                if (s.equals(paths[i])) {
+                    return;
+                }
+            }
+            String[] tmp = new String[paths.length+1];
+            System.arraycopy(paths,0,tmp,0,paths.length);
+            tmp[paths.length] = s;
+            field.set(null,tmp);
+        } catch (IllegalAccessException e) {
+            throw new IOException("Failed to get permissions to set library path");
+        } catch (NoSuchFieldException e) {
+            throw new IOException("Failed to get field handle to set library path");
+        }
+    }
+}

src/test/java/com/paul0523/AppTest.java

+package com.paul0523;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+    extends TestCase
+{
+    /**
+     * Create the test case
+     *
+     * @param testName name of the test case
+     */
+    public AppTest( String testName )
+    {
+        super( testName );
+    }
+
+    /**
+     * @return the suite of tests being tested
+     */
+    public static Test suite()
+    {
+        return new TestSuite( AppTest.class );
+    }
+
+    /**
+     * Rigourous Test :-)
+     */
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+}