Go Examples of using JNI development under Ubuntu

Http://www.cnblogs.com/zxglive2006/archive/2012/01/15/2323110.htmlCreate Java Project with Eclipse first;then add the Prompt.java file directly to the project and put it under the default package (it is best not to add the packages, otherwise error-prone). 1. Write a Java file in which you declare the native method and load the dynamic-link library through a static statement block, with the example Prompt.java code as follows: Class Prompt {Private native String getLine (string p     ROMPT);        public static void Main (String args[]) {Prompt p = new Prompt ();        String input = P.getline ("Type a Line:");    System.out.println ("User typed:" + input); } static {system.loadlibrary ("Prompt");//Here to so library name must not be mistaken, prompt corresponding to the actual library name is libprompt.so    }} 2. Call the Javac command to generate the Prompt.class file; Javac prompt.java3. Call the Javah command to generate the Prompt.h header file for the C program reference: JAVAH-JNI Prompt Auto-generated header files are as follows:/* Do not EDIT This file-it are machine generated */#include <jni.h>/* header for class Prompt */& nbsp, #ifndef _included_prompt#define _included_prompt#ifdef __cplusplusextern "C" {#endif/* * Class:     prompt * Method:    getline * Signature: (ljava/lang/string;) ljava/lang/string; */ Jniexport jstring jnicall java_prompt_getline   (jnienv *, Jobject, jstring);  #ifdef __cplusplus} #endif #endif4. Writing the prompt.c file for specific functions: #include <jni.h> #include <stdio.h> #include "Prompt.h"  jniexport void Jnicalljava_prompt_getline (jnienv *env, Jobject obj, jstring Prompt)  {    char buf[128];     const jbyte *str;    str = (*env)->getstringutfchars (env, prompt, NULL);   & Nbsp;if (str = = null) {        return null;   &nbsp        }    printf ("%s", str);     (*env) Releasestringutfchars (env, prompt, str);    scanf ("%s", buf);    return (*env), Newstringutf (env, BUF);} 5. Compile the dynamic library libprompt.so; The following error may be reported:

/USR/BIN/LD:/tmp/ccg1iykj.o:relocation r_x86_64_32 against '. Rodata ' can not is used when making a shared object; Recompile with-fpic
/tmp/ccg1iykj.o:error Adding symbols: Wrong value
Collect2:error:ld returned 1 exit status

Plus compile option-fpic; gcc-shared-fpic-i/usr/lib/jvm/java-6-sun-1.6.0.26/include-i/usr/lib/jvm/java-6-sun-1.6.0.26/include/linux Prompt.c-o Libprompt.so (gcc-shared-fpic-i/opt/java/jdk1.8.0_71/include/-i/opt/java/jdk1.8.0_71/include/linux/prompt.c-o libprompt.so) 6. Run. Java prompt may report the following error

Exception in thread "main" Java.lang.UnsatisfiedLinkError:no test in Java.library.path
At Java.lang.ClassLoader.loadLibrary (classloader.java:1864)
At Java.lang.Runtime.loadLibrary0 (runtime.java:870)
At Java.lang.System.loadLibrary (system.java:1122)
At Test.<clinit> (test.java:14)

You need to set the path of the Java.library.path to execute:

Java-djava.library.path=. Prompt

Go Examples of using JNI development under Ubuntu