在JNI原理及实现中，只是实现了一个Helloworld。

        回忆一下JNI的实现步骤：

     1.编写native声明的JAVA类;

     2.使用javac命令编译所编写的java类;

     3.使用Javah生成JNI头文件.h;

     4.编写本地方法实现方法;

     5.生成动态库;(如果方法实现是cpp写的话就一定要用g++来编译)

     6.在java中调用。

    下面的一个例子是C\C++与Java之间进行对象的操作。

1.创建Student类

/*  * FileName:Student.java  * Description:Class Student  * */ package pojo;  public class Student { 	 private int id;        private String name;       public Student(){}      public Student(int _id,String _name)      {     	 this.id=_id;     	 this.name=_name;      }      public void setId(int _id)      {     	 this.id=_id;      }      public void setName(String _name)      {     	 this.name=_name;      }      public int getId()      {     	 return id;      }      public String getName()      {     	 return name;      }      public String toString()      {     	 return "Name:"+name+" id:"+id;      } }

2.创建主调类 

/*  * FileName:JniMain.java  * Description:Main class  * */ package pojo;  public class JniMain {  	static{   		System.loadLibrary("studentbean");   	}   	public static native void sayHello();   	public native int getId();   	public native void setId(int i);   	public native void setName(String _name); 	public native Student getStudent(); 	public static void main(String[] args) { 		// TODO Auto-generated method stub	 		JniMain test=new JniMain(); 		test.setId(101); 		test.setName("Rose"); 		Student tmp=test.getStudent(); 		System.out.println("Id:"+tmp.getId()); 		System.out.println("Name:"+tmp.getName()); 		test.sayHello(); 	}  }

3.编译java，生成.h 

sudo javac pojo/JniMain.java pojo/Student.java  

javah -classpath . -jni pojo.JniMain

4.根据.h文件写函数实现

创建pojo_JniMain.cpp

#include"pojo_JniMain.h" #include <iostream> #include <stdio.h> using namespace std; int id=1; jobject student; jstring name; JNIEXPORT void JNICALL Java_pojo_JniMain_sayHello   (JNIEnv *evn, jclass cla) { 	printf("shit~\n"); } JNIEXPORT jint JNICALL Java_pojo_JniMain_getId   (JNIEnv *evn, jobject thiz) { 	return id; } JNIEXPORT void JNICALL Java_pojo_JniMain_setId   (JNIEnv *evn, jobject thiz, jint ji) { 	id=ji; } JNIEXPORT void JNICALL Java_pojo_JniMain_setName   (JNIEnv *env, jobject thiz, jstring _name) { 	//name=env->GetStringUTFChars(_name, 0);  	jclass studentClass = env->FindClass("pojo/Student");       jmethodID studentMethod = env->GetMethodID(studentClass,"<init>","()V");       jfieldID mId = env->GetFieldID(studentClass,"id","I");       jfieldID mstudentName = env->GetFieldID(studentClass,"name","Ljava/lang/String;");        jobject studentObject = env->NewObject(studentClass,studentMethod);       env->SetObjectField(studentObject,mstudentName,_name);       env->SetIntField(studentObject,mId,id);      student = studentObject; } JNIEXPORT jobject JNICALL Java_pojo_JniMain_getStudent   (JNIEnv *env, jobject thiz) { 	return student; }

5.编译动态库 

sudo g++ -shared -I /usr/local/lib/jdk1.6.0_29/include/ -I /usr/local/lib/jdk1.6.0_29/include/linux/ pojo_JniMain.cpp -o libstudentbean.so

6.运行

结果如下：

利用JNI进行对象操作_java


参考： Java JNI由浅入深(包括：Java和C++互传ArrayList泛型对象参数)-http://blog.csdn.net/u_xtian/article/details/6033963