Java中利用JNI调用c++生成的DLL

一、编写Java类

package test;

public class TestJNI

{
    public native int add(int a,int b);
    public native String upperCase(String str);
    static
    {
       System.loadLibrary("JniDll");
    }
    public static void main(String[] args)
    {
       TestJNI test = new TestJNI();
       int a=100, b=20, result;
       result = test.add(a, b);
  
       System.out.println("sum:" + result);
       String str1, str2,str3;

       str1 = "abcDEFhijk";
       str3 = "eahis";

       str2=test.upperCase(str1);
       System.out.println(str2);
    }

}package test;

public class Test