JNI 程序小结 v2JNI 程序小结 v2[typhoon@localhost sandbox]$ ls
0_guide.txt
[typhoon@localhost sandbox]$ mkdir -p src/tfw/rsch/jni
[typhoon@localhost sandbox]$ ls
0_guide.txt src
[typhoon@localhost sandbox]$ vi src/tfw/rsch/jni/MainTest.java
[typhoon@localhost sandbox]$ vi src/tfw/rsch/jni/JniTest_01_Loader.java
[typhoon@localhost sandbox]$ vi src/tfw/rsch/jni/JniTest_01_Caller.java
[typhoon@localhost sandbox]$ vi src/tfw/rsch/jni/JniTest_02_LoadAndCall.java
[typhoon@localhost sandbox]$ vi src/tfw/rsch/jni/JniTest_03_ToPureLocal.java
[typhoon@localhost sandbox]$ ls src/tfw/rsch/jni
JniTest_01_Caller.java JniTest_01_Loader.java JniTest_02_LoadAndCall.java JniTest_03_ToPureLocal.java MainTest.java
[typhoon@localhost sandbox]$/**
* This file is a component of FREE SOFTWARE.<br />
* <br />
* Any entity with self-awareness, or organization are allowed to use, modify or
* redistribute this according to the second version of "GNU Public License".<br />
* <br />
* The goal of this distribution is that this software being useful and helpful,
* FOR A PARTICULAR PURPOSE.<br />
*/
package tfw.rsch.jni;
import tfw.base.util.array.ArrayToolE;
import tfw.base.util.text.TextToolE;
/**
* Main class, to run a test method of JNI loading and calling.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-33
*/
public class MainTest
{
/**
* Main method, to run a test of JNI loading and calling.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-04-09_15-54
* @param str1dCmdArgs
* - Command line arguments.<br />
*/
public static void main(String[] str1dCmdArgs)
{
new MainTest().test(str1dCmdArgs);
}
/**
* General test method.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-29
* @param str1dArgs
* - Arguments.<br />
*/
private void test(String[] str1dArgs)
{
try
{
// [S] Pre-processing incoming arguments into a single string.
String strArgText = ArrayToolE.arrayForConsole(str1dArgs);
if (null == strArgText)
{
strArgText = "";
}
else if ("null".equals(strArgText))
{
strArgText = null;
}
// [E] Pre-processing incoming arguments into a single string.
test_01();
test_02(strArgText);
test_03(strArgText);
}
catch (Throwable t)
{
t.printStackTrace();
}
}
/**
* Test 01: Basic loading and calling of the native library.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-05-26_16-26
*/
private void test_01()
{
// Loading native library.
new JniTest_01_Loader();
// Calling native method of native library.
JniTest_01_Caller jt_01 = new JniTest_01_Caller();
jt_01.println();
jt_01.nativePrintln();
}
/**
* Test 02: <strong>Argument</strong> passing in and <strong>return
* value</strong> retrieving.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-29
* @param strArgText
* - Text argument to the native library.<br />
*/
private void test_02(String strArgText)
{
// Loading native library during class initializing.
JniTest_02_LoadAndCall jt_02 = new JniTest_02_LoadAndCall();
{
String strMethodHead =
TextToolE.concat("\tpublic String jt_02.javaManipulate(",
((null == strArgText) ? "null"
: ("\"" + strArgText + "\"")) + ")\n\t{");
System.out.println(strMethodHead);
// Calling the java method.
String strRst = jt_02.javaManipulate(strArgText);
String strMethodTail =
TextToolE
.concat("\t}\n\tGot Return Value: ",
((null == strRst) ? "null"
: ("\"" + strRst + "\"")));
System.out.println(strMethodTail);
}
System.out.println();
{
String strMethodHead =
TextToolE.concat(
"\tpublic native String jt_02.nativeManipulate(",
((null == strArgText) ? "null"
: ("\"" + strArgText + "\"")) + ")\n\t{");
System.out.println(strMethodHead);
// Calling the native method, here!
String strOut = jt_02.nativeManipulate(strArgText);
String strMethodTail =
TextToolE
.concat("\t}\n\tGot Return Value: ",
((null == strOut) ? "null"
: ("\"" + strOut + "\"")));
System.out.println(strMethodTail);
}
}
/**
* Test 03: Calling to the <u><strong>pure local native library</strong>
* that without any relationship to JNI or java</u> through the
* <u><strong>native JNI-bridge library</strong></u>.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-29
* @param strArgText
* - Text argument to the native library.<br />
*/
private void test_03(String strArgText)
{
// Loading native library during class initializing.
JniTest_03_ToPureLocal jt_03 = new JniTest_03_ToPureLocal();
{
String strMethodHead =
TextToolE.concat("\tpublic String jt_03.javaManipulate(",
((null == strArgText) ? "null"
: ("\"" + strArgText + "\"")) + ")\n\t{");
System.out.println(strMethodHead);
// Calling the java method.
String strRst = jt_03.javaManipulate(strArgText);
String strMethodTail =
TextToolE
.concat("\t}\n\tGot Return Value: ",
((null == strRst) ? "null"
: ("\"" + strRst + "\"")));
System.out.println(strMethodTail);
}
System.out.println();
{
String strMethodHead =
TextToolE.concat(
"\tpublic native String jt_03.nativeManipulate(",
((null == strArgText) ? "null"
: ("\"" + strArgText + "\"")) + ")\n\t{");
System.out.println(strMethodHead);
// Calling the native method, here!
String strOut = jt_03.nativeManipulate(strArgText);
String strMethodTail =
TextToolE
.concat("\t}\n\tGot Return Value: ",
((null == strOut) ? "null"
: ("\"" + strOut + "\"")));
System.out.println(strMethodTail);
}
}
}
/**
* This file is a component of FREE SOFTWARE.<br />
* <br />
* Any entity with self-awareness, or organization are allowed to use, modify or
* redistribute this according to the second version of "GNU Public License".
* <br />
* <br />
* The goal of this distribution is that this software being useful and helpful,
* FOR A PARTICULAR PURPOSE.<br />
*/
package tfw.rsch.jni;
/**
* Test 01:<br />
* This class loads the native library (shared object, or dynamic link library,
* and so on) during class initializing.<br />
*
* @author Typhoon.Free.Wolf
* @version 2017-03-25_16-00
*/
public class JniTest_01_Loader
{
/**
* Make sure to run during class initializing.<br />
*/
static
{
loadNativeLibrary();
}
/**
* Loads the native library (shared object, or dynamic link library, and so
* on).<br />
*
* @author Typhoon.Free.Wolf
* @version 2017-03-25_16-00
*/
private static void loadNativeLibrary()
{
// Loading native library file "libJniTest_01_ThisNameIsOK.so" (or
// "JniTest_01_ThisNameIsOK.dll", and so on) according to the library
// name "JniTest_01_ThisNameIsOK".
String strNativeLibraryName = "JniTest_01_ThisNameIsOK";
System.out.println("Loading \"" + strNativeLibraryName + "\"...");
System.loadLibrary(strNativeLibraryName); // <== Loading, here!
System.out.println("Loaded.");
}
}
/**
* This file is a component of FREE SOFTWARE.<br />
* <br />
* Any entity with self-awareness, or organization are allowed to use, modify or
* redistribute this according to the second version of "GNU Public License".<br />
* <br />
* The goal of this distribution is that this software being useful and helpful,
* FOR A PARTICULAR PURPOSE.<br />
*/
package tfw.rsch.jni;
/**
* Test 01:<br />
* This class provides an entrance to the native method in the native library
* (shared object, or dynamic link library, and so on) for java calling.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-05-26_16-30
*/
public class JniTest_01_Caller
{
/**
* A java method, prints a message to the standard-out.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-04-11_14-09
*/
public void println()
{
System.out.println("\tJava:\tWorks!");
}
/**
* Entrance to the native method in the native library (shared object, or
* dynamic link library, and so on).<br />
* The corresponding native method is supposed to print a message to the
* standard-out, just like what the java one above does.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-04-11_14-09
*/
public native void nativePrintln();
}
/**
* This file is a component of FREE SOFTWARE.<br />
* <br />
* Any entity with self-awareness, or organization are allowed to use, modify or
* redistribute this according to the second version of "GNU Public License".<br />
* <br />
* The goal of this distribution is that this software being useful and helpful,
* FOR A PARTICULAR PURPOSE.<br />
*/
package tfw.rsch.jni;
import tfw.base.util.misc.MiscToolE;
import tfw.base.util.text.TextToolE;
/**
* Test 02: This class<br />
* <ul>
* <li>Loads the native library (shared object, or dynamic link library, and so
* on) during class initializing;<br />
* </li>
* <li>Provides an entrance to the native method in the native library.<br />
* </li>
* </ul>
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-38
*/
public class JniTest_02_LoadAndCall
{
/**
* Make sure to run during class initializing.<br />
*/
static
{
loadNativeLibrary();
}
/**
* Loads the native library (shared object, or dynamic link library, and so
* on).<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-05-26_15-58
*/
private static void loadNativeLibrary()
{
// Loading native library file "libJniTest_02.so" (or "JniTest_02.dll",
// and so on) according to the library name "JniTest_02".
String strNativeLibraryName = "JniTest_02";
System.out.println("Loading \"" + strNativeLibraryName + "\"...");
System.loadLibrary(strNativeLibraryName); // <== Loading, here!
System.out.println("Loaded.");
}
/**
* A java method.<br />
* Prints the incoming text string to the standard-out, then receives the
* text string from the standard-input and finally returns it.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-36
* @param strText
* - Incoming text string.<br />
* @return A text string from the standard-input, <strong>could be
* null.</strong><br />
*/
public String javaManipulate(String strText)
{
// Printing the received argument.
String strReceiveText =
TextToolE.concat("\t\tJava:\n\n\t\tArgument:\n\t\t\t",
(null == strText) ? "null" : ("\"" + strText + "\""));
System.out.println(strReceiveText);
// [S] Receiving a text string for standard input.
System.out
.print("\t\tUser Input (\"null\" would be considered as null):\n\t\t\t");
String strUserInputText = MiscToolE.getline(System.in);
System.out.println("\t\tUser Input Received:\n\t\t\t"
+ ((null == strUserInputText) ? "null" : ("\""
+ strUserInputText + "\"")));
// [E] Receiving a text string for standard input.
// [S] Printing the value which to be returned.
String strReturnValue =
"null".equals(strUserInputText) ? null : strUserInputText;
System.out.println("\t\tReturns:\n\t\t\t"
+ ((null == strReturnValue) ? "null"
: ("\"" + strReturnValue + "\"")));
// [E] Printing the value which to be returned.
// Returning.
return strReturnValue;
}
/**
* Entrance to the native method in the native library (shared object, or
* dynamic link library, and so on).<br />
* The corresponding native method is supposed to print the incoming text
* string to the standard-out, then receive the text string from the
* standard-input and finally return it, just like what the java one above
* does.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-04-11_14-10
* @param strText
* - Incoming text string.<br />
* @return A text string actually returned from the native method,
* <strong>could be null.</strong><br />
*/
public native String nativeManipulate(String strText);
}
/**
* This file is a component of FREE SOFTWARE.<br />
* <br />
* Any entity with self-awareness, or organization are allowed to use, modify or
* redistribute this according to the second version of "GNU Public License".<br />
* <br />
* The goal of this distribution is that this software being useful and helpful,
* FOR A PARTICULAR PURPOSE.<br />
*/
package tfw.rsch.jni;
import tfw.base.util.misc.MiscToolE;
import tfw.base.util.text.TextToolE;
/**
* Test 03: This class<br />
* <ul>
* <li>Loads the native library (shared object, or dynamic link library, and so
* on) during class initializing;<br />
* </li>
* <li>Provides an entrance to the native method in the <strong><u>native
* JNI-bridge library</u></strong>.<br />
* </li>
* <li>The <u><strong>native JNI-bridge library</strong></u> is to call another
* <u><strong>pure, local native library</strong> that without any relationship
* to JNI or java</u>.<br />
* </li>
* </ul>
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-40
*/
public class JniTest_03_ToPureLocal
{
/**
* Make sure to run during class initializing.<br />
*/
static
{
loadNativeLibrary();
}
/**
* Loads the native library (shared object, or dynamic link library, and so
* on).<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-05-26_15-58
*/
private static void loadNativeLibrary()
{
// Loading native library file "libJniTest_03.so" (or "JniTest_03.dll",
// and so on) according to the library name "JniTest_03".
String strNativeLibraryName = "JniTest_03";
System.out.println("Loading \"" + strNativeLibraryName + "\"...");
System.loadLibrary(strNativeLibraryName); // <== Loading, here!
System.out.println("Loaded.");
}
/**
* A java method.<br />
* Prints the incoming text string to the standard-out, then receives the
* text string from the standard-input and finally returns it.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-06-25_18-36
* @param strText
* - Incoming text string.<br />
* @return A text string from the standard-input, <strong>could be
* null.</strong><br />
*/
public String javaManipulate(String strText)
{
// Printing the received argument.
String strReceiveText =
TextToolE.concat("\t\tJava:\n\n\t\tArgument:\n\t\t\t",
(null == strText) ? "null" : ("\"" + strText + "\""));
System.out.println(strReceiveText);
// [S] Receiving a text string for standard input.
System.out
.print("\t\tUser Input (\"null\" would be considered as null):\n\t\t\t");
String strUserInputText = MiscToolE.getline(System.in);
System.out.println("\t\tUser Input Received:\n\t\t\t"
+ ((null == strUserInputText) ? "null" : ("\""
+ strUserInputText + "\"")));
// [E] Receiving a text string for standard input.
// [S] Printing the value which to be returned.
String strReturnValue =
"null".equals(strUserInputText) ? null : strUserInputText;
System.out.println("\t\tReturns:\n\t\t\t"
+ ((null == strReturnValue) ? "null"
: ("\"" + strReturnValue + "\"")));
// [E] Printing the value which to be returned.
// Returning.
return strReturnValue;
}
/**
* Entrance to the native method in the native library (shared object, or
* dynamic link library, and so on).<br />
* The corresponding native method is supposed to print the incoming text
* string to the standard-out, then receive the text string from the
* standard-input and finally return it, just like what the java one above
* does.<br />
*
* @author Typhoon.Free.Wolf
* @version 2015-04-11_14-10
* @param strText
* - Incoming text string.<br />
* @return A text string actually returned from the native method,
* <strong>could be null.</strong><br />
*/
public native String nativeManipulate(String strText);
}
[typhoon@localhost sandbox]$ cp -a ../lib . [typhoon@localhost sandbox]$ mkdir classes [typhoon@localhost sandbox]$ ls 0_guide.txt classes lib src [typhoon@localhost sandbox]$ ls lib # ← 上述源代码引用的工具类在这个文件夹里。 tfw-base.aij.jar tfw-base.v2.2.8_2014-12-22_22-00.longest_night.jre150.aij.jar # ↑ ↖_ 工具类“ArrayToolE”、“MiscToolE”和“TextToolE”所在。 # `- 指向“tfw-base.v2.2.8_2014-12-22_22-00.longest_night.jre150.aij.jar”的符号链接。 [typhoon@localhost sandbox]$ javac -classpath lib/tfw-base.aij.jar -d classes src/tfw/rsch/jni/*.java [typhoon@localhost sandbox]$ ls classes/tfw/rsch/jni JniTest_01_Caller.class JniTest_01_Loader.class JniTest_02_LoadAndCall.class JniTest_03_ToPureLocal.class MainTest.class [typhoon@localhost sandbox]$
[typhoon@localhost sandbox]$ vi build_jni.sh [typhoon@localhost sandbox]$ ls 0_guide.txt build_jni.sh classes lib src [typhoon@localhost sandbox]$ sh build_jni.sh javah -classpath classes -o c_include/JniTest_01_This_name_is_OK.h tfw.rsch.jni.JniTest_01_Caller;echo $?; 0 javah -classpath classes -o c_include/JniTest_02.h tfw.rsch.jni.JniTest_02_LoadAndCall;echo $?; 0 javah -classpath classes -o c_include/JniTest_03.h tfw.rsch.jni.JniTest_03_ToPureLocal;echo $?; 0 [typhoon@localhost sandbox]$ ls 0_guide.txt build_jni.sh c_include classes src [typhoon@localhost sandbox]$ ls c_include JniTest_01_This_name_is_OK.h JniTest_02.h JniTest_03.h [typhoon@localhost sandbox]$
#!/bin/sh # JNI head file generating: CLAZZ="tfw.rsch.jni.JniTest_01_Caller"; OUTPUT="c_include/JniTest_01_This_name_is_OK.h"; echo "javah -classpath classes -o $OUTPUT $CLAZZ;echo \$?;"; javah -classpath classes -o $OUTPUT $CLAZZ;echo $?; CLAZZ="tfw.rsch.jni.JniTest_02_LoadAndCall"; OUTPUT="c_include/JniTest_02.h"; echo "javah -classpath classes -o $OUTPUT $CLAZZ;echo \$?;"; javah -classpath classes -o $OUTPUT $CLAZZ;echo $?; CLAZZ="tfw.rsch.jni.JniTest_03_ToPureLocal"; OUTPUT="c_include/JniTest_03.h"; echo "javah -classpath classes -o $OUTPUT $CLAZZ;echo \$?;"; javah -classpath classes -o $OUTPUT $CLAZZ;echo $?;
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class tfw_rsch_jni_JniTest_01_Caller */
#ifndef _Included_tfw_rsch_jni_JniTest_01_Caller
#define _Included_tfw_rsch_jni_JniTest_01_Caller
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: tfw_rsch_jni_JniTest_01_Caller
* Method: nativePrintln
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_tfw_rsch_jni_JniTest_101_1Caller_nativePrintln
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif |
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class tfw_rsch_jni_JniTest_02_LoadAndCall */
#ifndef _Included_tfw_rsch_jni_JniTest_02_LoadAndCall
#define _Included_tfw_rsch_jni_JniTest_02_LoadAndCall
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: tfw_rsch_jni_JniTest_02_LoadAndCall
* Method: nativeManipulate
* Signature: (Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_tfw_rsch_jni_JniTest_102_1LoadAndCall_nativeManipulate
(JNIEnv *, jobject, jstring);
#ifdef __cplusplus
}
#endif
#endif |
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class tfw_rsch_jni_JniTest_03_ToPureLocal */
#ifndef _Included_tfw_rsch_jni_JniTest_03_ToPureLocal
#define _Included_tfw_rsch_jni_JniTest_03_ToPureLocal
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: tfw_rsch_jni_JniTest_03_ToPureLocal
* Method: nativeManipulate
* Signature: (Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_tfw_rsch_jni_JniTest_103_1ToPureLocal_nativeManipulate
(JNIEnv *, jobject, jstring);
#ifdef __cplusplus
}
#endif
#endif |
[typhoon@localhost sandbox]$ mkdir c_src
[typhoon@localhost sandbox]$ ls
0_guide.txt build_jni.sh c_include classes c_src lib src
[typhoon@localhost sandbox]$ vi c_src/JniTest_01_THIS_NAME_IS_OK.c
[typhoon@localhost sandbox]$ vi c_src/JniTest_02.c
[typhoon@localhost sandbox]$ vi c_src/JniTest_03.c
[typhoon@localhost sandbox]$ vi c_src/PureLocalNoJava.c
[typhoon@localhost sandbox]$ ls c_src
JniTest_01_THIS_NAME_IS_OK.c JniTest_02.c JniTest_03.c PureLocalNoJava.c
[typhoon@localhost sandbox]$
#include <jni.h>
#include <stdio.h>
#include <JniTest_01_This_name_is_OK.h>
JNIEXPORT void JNICALL Java_tfw_rsch_jni_JniTest_101_1Caller_nativePrintln
(JNIEnv *env, jobject obj)
{
printf("\tJNI:\tWorks!\n");
return;
}
#include <jni.h>
#include <stdio.h>
#include <JniTest_02.h>
void interactiveGetLine(char *strBuff, int intBuffSize)
{
printf("\t\tvoid interactiveGetLine(char *strBuff, int [%d])\n\t\t{\n",
intBuffSize);
// Receiving a text string for standard input, without line breaker.
printf("\t\t\tUser Input:\n\t\t\t\t");
fgets(strBuff, intBuffSize, stdin);
printf("\t\t\tUser Input Received:\n\t\t\t\t\"%s\"\n", strBuff);
// [S] Setting the value index of first line breaker as string ending.
int intIdx = 0;
for (; intIdx < intBuffSize; intIdx++)
{
if ('\r' == strBuff[intIdx] || '\n' == strBuff[intIdx])
{
strBuff[intIdx] = '\0';
break;
}
}
printf("\t\t\tLine Breaker Removed:\n\t\t\t\t\"%s\"\n", strBuff);
// [E] Setting the value index of first line breaker as string ending.
printf("\t\t}\n");
}
JNIEXPORT jstring JNICALL Java_tfw_rsch_jni_JniTest_102_1LoadAndCall_nativeManipulate
(JNIEnv *jniEnv, jobject jobj, jstring jstrArg)
{
// Printing the received argument.
printf("\t\tJNI:\n\n\t\tOriginal Argument:\n\t\t\t");
printf((NULL == jstrArg) ? "%s\n" : "\"%s\"\n", jstrArg);
// Converting the received argument into a C styled string, and printing.
const char *strConvertedArg = (NULL == jstrArg) ? NULL
: (*jniEnv)->GetStringUTFChars(jniEnv, jstrArg, 0);
printf("\t\tConverted Argument:\n\t\t\t");
printf((NULL == strConvertedArg) ? "%s\n" : "\"%s\"\n", strConvertedArg);
// Now the JNI argument is useless, release it.
(*jniEnv)->ReleaseStringUTFChars(jniEnv, jstrArg, strConvertedArg);
// Receiving a line of user input from standard input into buffer.
int MEANINGFUL_LENGTH = 256;
int intBuffSize = MEANINGFUL_LENGTH + 1;
char ch1dUserInputBuff[intBuffSize];
interactiveGetLine(ch1dUserInputBuff, intBuffSize);
// Printing the value which to be returned.
printf("\t\tReturn Value (\"NULL\" is considered as null):\n\t\t\t");
const char *strToReturn = (0 == strcmp(ch1dUserInputBuff, "NULL")) ? NULL
: ch1dUserInputBuff;
printf((NULL == strToReturn) ? "%s\n" : "\"%s\"\n", strToReturn);
// Converting the return value into java string, and printing.
jstring jstrToReturn = (*jniEnv)->NewStringUTF(jniEnv, strToReturn);
printf("\t\tConverted:\n\t\t\t");
printf((NULL == jstrToReturn) ? "%s\n" : "\"%s\"\n", jstrToReturn);
// Returning.
return jstrToReturn;
}
#include <jni.h>
#include <stdio.h>
#include <JniTest_03.h>
JNIEXPORT jstring JNICALL Java_tfw_rsch_jni_JniTest_103_1ToPureLocal_nativeManipulate
(JNIEnv *jniEnv, jobject jobj, jstring jstrArg)
{
// Printing the received argument.
printf("\t\tJNI:\n\n\t\tOriginal Argument:\n\t\t\t");
printf((NULL == jstrArg) ? "%s\n" : "\"%s\"\n", jstrArg);
// Converting the received argument into a C styled string, and printing.
const char *strConvertedArg = (NULL == jstrArg) ? NULL
: (*jniEnv)->GetStringUTFChars(jniEnv, jstrArg, 0);
printf("\t\tConverted Argument:\n\t\t\t");
printf((NULL == strConvertedArg) ? "%s\n" : "\"%s\"\n", strConvertedArg);
// Now the JNI argument is useless, release it.
(*jniEnv)->ReleaseStringUTFChars(jniEnv, jstrArg, strConvertedArg);
// Receiving a line of user input from standard input into buffer.
int MEANINGFUL_LENGTH = 256;
int intBuffSize = MEANINGFUL_LENGTH + 1;
char ch1dUserInputBuff[intBuffSize];
interactiveGetLine(ch1dUserInputBuff, intBuffSize);
// Printing the value which to be returned.
printf("\t\tReturn Value (\"NULL\" is considered as null):\n\t\t\t");
const char *strToReturn = (0 == strcmp(ch1dUserInputBuff, "NULL")) ? NULL
: ch1dUserInputBuff;
printf((NULL == strToReturn) ? "%s\n" : "\"%s\"\n", strToReturn);
// Converting the return value into java string, and printing.
jstring jstrToReturn = (*jniEnv)->NewStringUTF(jniEnv, strToReturn);
printf("\t\tConverted:\n\t\t\t");
printf((NULL == jstrToReturn) ? "%s\n" : "\"%s\"\n", jstrToReturn);
// Returning.
return jstrToReturn;
}
#include <stdio.h>
void interactiveGetLine(char *strBuff, int intBuffSize)
{
printf("\t\tvoid interactiveGetLine(char *strBuff, int [%d])\n\t\t{\n",
intBuffSize);
printf("\t\t\tPure Local: Look Ma No Java!\n\n");
// Receiving a text string for standard input, without line breaker.
printf("\t\t\tUser Input:\n\t\t\t\t");
fgets(strBuff, intBuffSize, stdin);
printf("\t\t\tUser Input Received:\n\t\t\t\t\"%s\"\n", strBuff);
// [S] Setting the value index of first line breaker as string ending.
int intIdx = 0;
for (; intIdx < intBuffSize; intIdx++)
{
if ('\r' == strBuff[intIdx] || '\n' == strBuff[intIdx])
{
strBuff[intIdx] = '\0';
break;
}
}
printf("\t\t\tLine Breaker Removed:\n\t\t\t\t\"%s\"\n", strBuff);
// [E] Setting the value index of first line breaker as string ending.
printf("\t\t}\n");
}
[typhoon@localhost sandbox]$ vi build_native.sh [typhoon@localhost sandbox]$ ls 0_guide.txt build_jni.sh build_native.sh c_include classes c_src lib src [typhoon@localhost sandbox]$ sh build_native.sh gcc c_src/JniTest_01_THIS_NAME_IS_OK.c -fPIC -shared -I c_include -I /usr/lib/jvm/java-1.7.0-openjdk.x86_64/include -I /usr/lib/jvm/java-1.7.0-openjdk.x86_64/include/linux -o lib/libJniTest_01_ThisNameIsOK.so;echo $?; 0 gcc c_src/JniTest_02.c -fPIC -shared -I c_include -I /usr/lib/jvm/java-1.7.0-openjdk.x86_64/include -I /usr/lib/jvm/java-1.7.0-openjdk.x86_64/include/linux -o lib/libJniTest_02.so;echo $?; 0 gcc c_src/PureLocalNoJava.c -fPIC -shared -o lib/libPureLocalNoJava.so;echo $?; 0 gcc c_src/JniTest_03.c -fPIC -shared -I c_include -I /usr/lib/jvm/java-1.7.0-openjdk.x86_64/include -I /usr/lib/jvm/java-1.7.0-openjdk.x86_64/include/linux -L /ext/var/home.123/typhoon/work/Eclipse.Projects/java.tfw.jni_rsch/sandbox/lib -l PureLocalNoJava -o lib/libJniTest_03.so;echo $?; 0 chmod 644 lib/*.so;echo $?; 0 [typhoon@localhost sandbox]$ ls lib libJniTest_01_ThisNameIsOK.so libJniTest_02.so libJniTest_03.so libPureLocalNoJava.so tfw-base.aij.jar tfw-base.v2.2.8_2014-12-22_22-00.longest_night.jre150.aij.jar [typhoon@localhost sandbox]$
#!/bin/sh # Native library compiling: # JNI related: C_SOURCE_FILE="c_src/JniTest_01_THIS_NAME_IS_OK.c"; OUTPUT="lib/libJniTest_01_ThisNameIsOK.so"; echo "gcc $C_SOURCE_FILE -fPIC -shared -I c_include -I $JAVA_HOME/include -I $JAVA_HOME/include/linux $3 -o $OUTPUT;echo \$?;"; gcc $C_SOURCE_FILE -fPIC -shared -I c_include -I $JAVA_HOME/include -I $JAVA_HOME/include/linux $3 -o $OUTPUT;echo $?; # JNI related: C_SOURCE_FILE="c_src/JniTest_02.c"; OUTPUT="lib/libJniTest_02.so"; echo "gcc $C_SOURCE_FILE -fPIC -shared -I c_include -I $JAVA_HOME/include -I $JAVA_HOME/include/linux $3 -o $OUTPUT;echo \$?;"; gcc $C_SOURCE_FILE -fPIC -shared -I c_include -I $JAVA_HOME/include -I $JAVA_HOME/include/linux $3 -o $OUTPUT;echo $?; # Pure local: C_SOURCE_FILE="c_src/PureLocalNoJava.c"; OUTPUT="lib/libPureLocalNoJava.so"; echo "gcc $C_SOURCE_FILE -fPIC -shared -o $OUTPUT;echo \$?;"; gcc $C_SOURCE_FILE -fPIC -shared -o $OUTPUT;echo $?; # JNI related: C_SOURCE_FILE="c_src/JniTest_03.c"; OUTPUT="lib/libJniTest_03.so"; LIB_PATH="$(pwd)/lib"; LIB_NAME="PureLocalNoJava"; echo "gcc $C_SOURCE_FILE -fPIC -shared -I c_include -I $JAVA_HOME/include -I $JAVA_HOME/include/linux -L $LIB_PATH -l $LIB_NAME -o $OUTPUT;echo \$?;"; gcc $C_SOURCE_FILE -fPIC -shared -I c_include -I $JAVA_HOME/include -I $JAVA_HOME/include/linux -L $LIB_PATH -l $LIB_NAME -o $OUTPUT;echo $?; # Permission: echo "chmod 644 lib/*.so;echo \$?;"; chmod 644 lib/*.so;echo $?;
[typhoon@localhost sandbox]$ alias jrun='java -classpath classes:lib/tfw-base.aij.jar -Djava.library.path=lib'
[typhoon@localhost sandbox]$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$(pwd)/lib
[typhoon@localhost sandbox]$ echo $LD_LIBRARY_PATH
LD_LIBRARY_PATH:/home/typhoon/123/work/Eclipse.Projects/java.tfw.jni_rsch/sandbox/lib
[typhoon@localhost sandbox]$ ldd lib/libJniTest_03.so
ldd: 警告: 你没有执行权限 `lib/libJniTest_03.so'
linux-vdso.so.1 => (0x00007ffff51e5000)
libPureLocalNoJava.so => /home/typhoon/123/work/Eclipse.Projects/java.tfw.jni_rsch/sandbox/lib/libPureLocalNoJava.so (0x00007fc9d0cb9000)
libc.so.6 => /lib64/libc.so.6 (0x00007fc9d090d000)
/lib64/ld-linux-x86-64.so.2 (0x0000003132400000)
[typhoon@localhost sandbox]$
[typhoon@localhost sandbox]$ jrun tfw.rsch.jni.MainTest "一二三四五" "上山打老虎"
Loading "JniTest_01_ThisNameIsOK"...
Loaded.
Java: Works!
JNI: Works!
Loading "JniTest_02"...
Loaded.
public String jt_02.javaManipulate("一二三四五, 上山打老虎")
{
Java:
Argument:
"一二三四五, 上山打老虎"
User Input ("null" would be considered as null):
老虎没打到，打到小松鼠！
User Input Received:
"老虎没打到，打到小松鼠！"
Returns:
"老虎没打到，打到小松鼠！"
}
Got Return Value: "老虎没打到，打到小松鼠！"
public native String jt_02.nativeManipulate("一二三四五, 上山打老虎")
{
JNI:
Original Argument:
" 4��"
Converted Argument:
"一二三四五, 上山打老虎"
void interactiveGetLine(char *strBuff, int [257])
{
User Input:
NULL
User Input Received:
"NULL
"
Line Breaker Removed:
"NULL"
}
Return Value ("NULL" is considered as null):
(null)
Converted:
(null)
}
Got Return Value: null
Loading "JniTest_03"...
Loaded.
public String jt_03.javaManipulate("一二三四五, 上山打老虎")
{
Java:
Argument:
"一二三四五, 上山打老虎"
User Input ("null" would be considered as null):
null
User Input Received:
"null"
Returns:
null
}
Got Return Value: null
public native String jt_03.nativeManipulate("一二三四五, 上山打老虎")
{
JNI:
Original Argument:
" 4��"
Converted Argument:
"一二三四五, 上山打老虎"
void interactiveGetLine(char *strBuff, int [257])
{
Pure Local: Look Ma No Java!
User Input:
老虎没打到，打到小松鼠！
User Input Received:
"老虎没打到，打到小松鼠！
"
Line Breaker Removed:
"老虎没打到，打到小松鼠！"
}
Return Value ("NULL" is considered as null):
"老虎没打到，打到小松鼠！"
Converted:
"h��"
}
Got Return Value: "老虎没打到，打到小松鼠！"
[typhoon@localhost sandbox]$