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Java通过JNI调用Tuxedo方法

来源:长理培训发布时间:2017-12-19 13:59:17

  如果想要一个免费,不使用Weblogic WTC JOLT,实现Java调用Tuxedo,那最容易想到的就是通过JNI,让Java执行native代码,实现对Tuxedo的调用。

  环境:Suse 9  Tuxedo 8.1  Java1.4 $JAVA_HOME $TUXDIR

  实现的步骤

编写带native方法的Java类

  /**

  * This is a demo class for test JNI

  *

  *

  */

  public class Hello {

  static {

  try {

  // "hello" means the library of native method

  System.loadLibrary("hello");

  } catch (UnsatisfiedLinkError e) {

  System.err.println("Cannot load hello library:"n " + e.toString());

  }

  }

  public Hello() {

  }

  // This is a native method without args and return

  public native void SayHello();

  }

  2.编译为.class文件

  javac Hello.java

  3.生成.h文件

  javah Hello|||

  4.编写对应的C文件,我一般直接拷贝一个.h文件为.c,之后修改,感觉比较不会出错

  #include

  #include "atmi.h"    /* TUXEDO  Header File */

  /* DO NOT EDIT THIS FILE - it is machine generated */

  #include

  /* Header for class Hello */

  #ifndef _Included_Hello

  #define _Included_Hello

  #ifdef __cplusplus

  extern "C" {

  #endif

  /*

  * Class:   Hello

  * Method:   SayHello

  * Signature: ()V

  */

  JNIEXPORT void JNICALL Java_Hello_SayHello

  (JNIEnv * env, jobject arg)

  {

  char *sendbuf, *rcvbuf;

  long sendlen, rcvlen;

  int ret;

  printf("THIS IS JNI Say Hello"n");

  /* Attach to System/T as a Client Process */

  if (tpinit((TPINIT *) NULL) == -1) {

  (void) fprintf(stderr, "Tpinit failed"n");

  exit(1);

  }

  sendlen = 32;

  /* Allocate STRING buffers for the request and the reply */

  if((sendbuf = (char *) tpalloc("STRING", NULL, sendlen+1)) == NULL) {

  (void) fprintf(stderr,"Error allocating send buffer"n");

  tpterm();

  exit(1);

  }|||

  if((rcvbuf = (char *) tpalloc("STRING", NULL, sendlen+1)) == NULL) {

  (void) fprintf(stderr,"Error allocating receive buffer"n");

  tpfree(sendbuf);

  tpterm();

  exit(1);

  }

  (void) strcpy(sendbuf, "0123456789abcdef0123456789abcdef");

  /* Request the service TOUPPER, waiting for a reply */

  ret = tpcall("TOUPPER", (char *)sendbuf, 0, (char **)&rcvbuf, &rcvlen, (long)0);

  if(ret == -1) {

  (void) fprintf(stderr, "Can't send request to service TOUPPER"n");

  (void) fprintf(stderr, "Tperrno = %d"n", tperrno);

  tpfree(sendbuf);

  tpfree(rcvbuf);

  tpterm();

  exit(1);

  }

  (void) fprintf(stdout, "Returned string is: %s"n", rcvbuf);

  /* Free Buffers & Detach from System/T */

  tpfree(sendbuf);

  tpfree(rcvbuf);

  tpterm();

  return;

  }

  #ifdef __cplusplus

  }

  #endif

  #endif

  5.编译.c为.o .so

  gcc -I$JAVA_HOME/include -I$JAVA_HOME/include/linux -I$TUXDIR/include -c -L${TUXDIR}/lib Hello.c

  gcc -shared -I$JAVA_HOME/include -I$JAVA_HOME/include/linux -I$TUXDIR/include -L$TUXDIR/lib  -ltux -lbuft  -lfml -lfml32 -lengine -ldl -lpthread /usr/lib/libcrypt.a -Wl,-soname,libhello.so.1 -o libhello.so.1.0 Hello.o

  cp libhello.so.1.0 libhello.so

  6.ldd libhello.so

  如果看到一下的输出,恭喜!基本OK啦!|||

  linux-gate.so.1 =>  (0xffffe000)

  libtux.so => /home/tuxedo/product/tuxedo8.1/lib/libtux.so (0x40003000)

  libbuft.so => /home/tuxedo/product/tuxedo8.1/lib/libbuft.so (0x40110000)

  libfml.so => /home/tuxedo/product/tuxedo8.1/lib/libfml.so (0x40112000)

  libfml32.so => /home/tuxedo/product/tuxedo8.1/lib/libfml32.so (0x4012a000)

  libengine.so => /home/tuxedo/product/tuxedo8.1/lib/libengine.so (0x40144000)

  libdl.so.2 => /lib/libdl.so.2 (0x401db000)

  libpthread.so.0 => /lib/tls/libpthread.so.0 (0x401de000)

  libc.so.6 => /lib/tls/libc.so.6 (0x401ee000)

  libgiconv.so => /home/tuxedo/product/tuxedo8.1/lib/libgiconv.so (0x40302000)

  libusort.so => /home/tuxedo/product/tuxedo8.1/lib/libusort.so (0x403d6000)

  /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)

  7.编写测试类

  /**

  * This class used test JNI method in Hello

  *

  */

  public class SayHello {

  /**

  * @param args

  */

  public static void main(String args) {

  Hello hello = new Hello();

  hello.SayHello();

  }

  }

  8.执行测试

  java –cp . SayHello

责编:罗莉

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