window JNI_CreateJavaVM启动java程序

https://blog.csdn.net/earbao/article/details/51889605

1. #define _CRT_SECURE_NO_WARNINGS 1
2.  
    
3.  
   #include <stdio.h>
4.  
   #include "jni.h"
5.  
   #include <stdlib.h>
6.  
   #include <windows.h>
7.  
   #include <tchar.h>
8.  
    
9.  
    
10.  
    //#pragma comment(lib, "jvm.lib")
11.  
     
12.  
    #define PATH_SEPARATOR ';' /* define it to be ':' on Solaris */
13.  
     
14.  
    #define USER_CLASSPATH "." /* where Prog.class is */
15.  
     
16.  
    void testEnv()
17.  
    {
18.  
    #ifdef _WIN32
19.  
     
20.  
    CHAR dir[1024],path[1024];
21.  
    GetCurrentDirectoryA(MAX_PATH, dir);
22.  
     
23.  
    sprintf(path, "set PATH=%s\\jre\\bin\\client;.;", dir);
24.  
    system(path);
25.  
    printf("%s\n", path);
26.  
     
27.  
     
28.  
    /**
29.  
    //set PATH=%PATH%;%currentdir%\jre\bin\client;
30.  
    TCHAR dir[1024];
31.  
    GetCurrentDirectoryA(MAX_PATH, dir);
32.  
     
33.  
    CHAR p[1024], path[1024];
34.  
    GetEnvironmentVariableA("PATH", p, 1024);
35.  
    sprintf("PATH = %s\n", p);
36.  
     
37.  
    sprintf(path, "%s;%s\\jre\\bin\\client", p, dir);
38.  
    system(path);
39.  
    printf("%s\n", path);
40.  
     
41.  
    GetEnvironmentVariableA("PATH", path, 1024);
42.  
    printf("PATH = %s\n", path);
43.  
    */
44.  
     
45.  
     
46.  
    #else
47.  
    char * p;
48.  
    if ((p = getenv("USER")))
49.  
    printf("USER = %s\n", p);
50.  
     
51.  
    setenv("USER", "test", 1);
52.  
    printf("USER = %s\n", getenv("USER"));
53.  
     
54.  
    unsetenv("USER");
55.  
    printf("USER = %s\n", getenv("USER"));
56.  
     
57.  
     
58.  
     
59.  
    #endif // __WIN32
60.  
     
61.  
     
62.  
     
63.  
    }
64.  
     
65.  
     
66.  
    //window JNI_CreateJavaVM启动java程序
67.  
    int main(int argc, char* argv[])
68.  
    {
69.  
    JNIEnv *env;
70.  
    JavaVM *jvm;
71.  
    jint res;
72.  
    jclass cls;
73.  
    jmethodID mid;
74.  
    jstring jstr;
75.  
    jclass stringClass;
76.  
    jobjectArray args;
77.  
     
78.  
    testEnv();
79.  
    CHAR dir[1024], path[1024];
80.  
    GetCurrentDirectoryA(MAX_PATH, dir);
81.  
    sprintf(path, "%s\\jre\\bin\\client\\jvm.dll", dir);
82.  
     
83.  
    typedef jint (*JNI_CreateJavaVMT)(JavaVM **pvm, void **penv, void *args);
84.  
    JNI_CreateJavaVMT pJNI_CreateJavaVM = (JNI_CreateJavaVMT)GetProcAddress(LoadLibraryA(path), "JNI_CreateJavaVM");
85.  
    if (pJNI_CreateJavaVM == NULL)
86.  
    {
87.  
    printf("pJNI_CreateJavaVM == NULL\n");
88.  
    }
89.  
    else
90.  
    {
91.  
    printf("pJNI_CreateJavaVM != NULL\n");
92.  
     
93.  
    }
94.  
     
95.  
     
96.  
    #ifdef JNI_VERSION_1_2
97.  
     
98.  
    JavaVMInitArgs vm_args;
99.  
    JavaVMOption options[1];
100.  
     options[0].optionString ="-Djava.class.path=.";
101.  
     vm_args.version = 0x00010002;
102.  
     vm_args.options = options;
103.  
     vm_args.nOptions = 1;
104.  
     vm_args.ignoreUnrecognized = JNI_TRUE;
105.  
     /* Create the Java VM */
106.  
     res = pJNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
107.  
     #else
108.  
     JDK1_1InitArgs vm_args;
109.  
     char classpath[1024];
110.  
     vm_args.version = 0x00010001;
111.  
     JNI_GetDefaultJavaVMInitArgs(&vm_args);
112.  
     /* Append USER_CLASSPATH to the default system class path */
113.  
     sprintf(classpath, "%s%c%s",
114.  
     vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH);
115.  
     vm_args.classpath = classpath;
116.  
     /* Create the Java VM */
117.  
     res = JNI_CreateJavaVM(&jvm, &env, &vm_args);
118.  
     #endif /* JNI_VERSION_1_2 */
119.  
     if (res < 0) {
120.  
     fprintf(stderr, "Can't create Java VM\n");
121.  
     exit(1);
122.  
     }
123.  
     cls = (*env)->FindClass(env, "Prog");
124.  
     if (cls == NULL) {
125.  
     goto destroy;
126.  
     }
127.  
     mid = (*env)->GetStaticMethodID(env, cls, "main","([Ljava/lang/String;)V");
128.  
     if (mid == NULL) {
129.  
     goto destroy;
130.  
     }
131.  
      
132.  
     jstr = (*env)->NewStringUTF(env, " from C!");
133.  
     if (jstr == NULL) {
134.  
     goto destroy;
135.  
      
136.  
     }
137.  
     stringClass = (*env)->FindClass(env, "java/lang/String");
138.  
     args = (*env)->NewObjectArray(env, 1, stringClass, jstr);
139.  
     if (args == NULL) {
140.  
      
141.  
     goto destroy;
142.  
      
143.  
     }
144.  
     (*env)->CallStaticVoidMethod(env, cls, mid, args);
145.  
     destroy:
146.  
      
147.  
     if ((*env)->ExceptionOccurred(env)) {
148.  
      
149.  
     (*env)->ExceptionDescribe(env);
150.  
      
151.  
     }
152.  
      
153.  
     (*jvm)->DestroyJavaVM(jvm);
154.  
      
155.  
     }

1.  
   import java.io.IOException;
2.  
    
3.  
   public class Prog {
4.  
    
5.  
   public static void main(String[] args) throws IOException {
6.  
   //System.out.println(args.length);
7.  
   if(args.length>0)
8.  
   {
9.  
   System.out.println("Hello World " + args[0]);
10.  
     
11.  
    }else{
12.  
    System.out.println("Hello World ");
13.  
     
14.  
    }
15.  
    System.in.read();
16.  
    }
17.  
     
18.  
    }

exe通过jni调用Java程序

1.  
   #define _CRT_SECURE_NO_WARNINGS 1
2.  
    
3.  
   #include <stdio.h>
4.  
   #include "jni.h"
5.  
   #include <stdlib.h>
6.  
   #include <windows.h>
7.  
   #include <tchar.h>
8.  
    
9.  
   //#pragma comment(lib, "jvm.lib")
10.  
     
11.  
    #define PATH_SEPARATOR ';' /* define it to be ':' on Solaris */
12.  
    #define USER_CLASSPATH "." /* where Prog.class is */
13.  
     
14.  
    void testEnv()
15.  
    {
16.  
     
17.  
    CHAR dir[1024], path[1024];
18.  
    GetCurrentDirectoryA(MAX_PATH, dir);
19.  
    sprintf(path, "set PATH=%s\\jre\\bin\\client;.;", dir);
20.  
    system(path);
21.  
    printf("%s\n", path);
22.  
    sprintf(path, "set PATH=%s\\jre\\bin\\server;.;", dir);
23.  
    system(path);
24.  
    printf("%s\n", path);
25.  
    }
26.  
     
27.  
     
28.  
    //window JNI_CreateJavaVM启动java程序
29.  
    int main(int argc, char* argv[])
30.  
    {
31.  
    JNIEnv *env;
32.  
    JavaVM *jvm;
33.  
    jint res;
34.  
    jclass cls;
35.  
    jmethodID mid;
36.  
    jstring jstr;
37.  
    jclass stringClass;
38.  
    jobjectArray args;
39.  
     
40.  
    //testEnv();
41.  
    CHAR dir[1024], path[1024];
42.  
    GetCurrentDirectoryA(MAX_PATH, dir);
43.  
    //注意exe的位数64bit/32bit要和jdk的相匹配
44.  
    HMODULE handle = NULL;
45.  
    if (argc > 1)
46.  
    {
47.  
    sprintf(path, "%s", argv[1]);
48.  
    printf("%s\n", path);
49.  
    handle=LoadLibraryA(path);
50.  
    }
51.  
    if (handle == NULL)
52.  
    {
53.  
    sprintf(path, "%s\\jre\\bin\\client\\jvm.dll", dir);
54.  
    printf("%s\n", path);
55.  
    handle = LoadLibraryA(path);
56.  
    }
57.  
    if (handle == NULL)
58.  
    {
59.  
    sprintf(path, "%s\\jre\\bin\\server\\jvm.dll", dir);
60.  
    printf("%s\n", path);
61.  
    handle = LoadLibraryA(path);
62.  
    }
63.  
    if (handle == NULL)
64.  
    {
65.  
    handle = LoadLibraryA("jvm.dll");
66.  
    }
67.  
    if (handle == NULL)
68.  
    {
69.  
    printf("handle==NULL\n");
70.  
    return -1;
71.  
    }
72.  
     
73.  
    typedef jint(*JNI_CreateJavaVMT)(JavaVM **pvm, void **penv, void *args);
74.  
    JNI_CreateJavaVMT pJNI_CreateJavaVM = (JNI_CreateJavaVMT)GetProcAddress(handle, "JNI_CreateJavaVM");
75.  
    if (pJNI_CreateJavaVM == NULL)
76.  
    {
77.  
    printf("pJNI_CreateJavaVM == NULL\n");
78.  
    }
79.  
    else
80.  
    {
81.  
    printf("pJNI_CreateJavaVM != NULL\n");
82.  
     
83.  
    }
84.  
    //初始化jvm参数 http://blog.csdn.net/louka/article/details/7101562
85.  
    JavaVMInitArgs vm_args;
86.  
    JavaVMOption options[2];
87.  
    //搜索的类路径。把java类和jar包放在当前目录下
88.  
    #if _WIN32
89.  
    options[0].optionString = "-Djava.class.path=.;test.jar"; //这里指定了要使用的第三方Jar包
90.  
    #else
91.  
    options[0].optionString = "-Djava.class.path=.:test.jar"; //这里指定了要使用的第三方Jar包
92.  
    #endif
93.  
     
94.  
    options[1].optionString = "-verbose:NONE"; //用于跟踪运行时的信息
95.  
     
96.  
    vm_args.version = 0x00010002;
97.  
    vm_args.options = options;
98.  
    vm_args.nOptions = 1;
99.  
    vm_args.ignoreUnrecognized = JNI_TRUE;
100.  
     /* Create the Java VM */
101.  
     res = pJNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
102.  
      
103.  
     if (res < 0) {
104.  
     fprintf(stderr, "Can't create Java VM\n");
105.  
     exit(1);
106.  
     }
107.  
     cls = (*env)->FindClass(env, "Prog");
108.  
     if (cls == NULL) {
109.  
     goto destroy;
110.  
     }
111.  
     mid = (*env)->GetStaticMethodID(env, cls, "main", "([Ljava/lang/String;)V");
112.  
     if (mid == NULL) {
113.  
     goto destroy;
114.  
     }
115.  
      
116.  
     jstr = (*env)->NewStringUTF(env, " from C!");
117.  
     if (jstr == NULL) {
118.  
     goto destroy;
119.  
      
120.  
     }
121.  
     stringClass = (*env)->FindClass(env, "java/lang/String");
122.  
     args = (*env)->NewObjectArray(env, 1, stringClass, jstr);
123.  
     if (args == NULL) {
124.  
     goto destroy;
125.  
     }
126.  
     (*env)->CallStaticVoidMethod(env, cls, mid, args);
127.  
     (*env)->DeleteLocalRef(env, cls);
128.  
     (*env)->DeleteLocalRef(env, jstr);
129.  
     (*env)->DeleteLocalRef(env, stringClass);
130.  
     (*env)->DeleteLocalRef(env, args);
131.  
      
132.  
     destroy:
133.  
     if ((*env)->ExceptionOccurred(env)) {
134.  
     (*env)->ExceptionDescribe(env);
135.  
     }
136.  
     (*jvm)->DestroyJavaVM(jvm);
137.  
     FreeLibrary(handle);
138.  
     }
139.  
      

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