c#调用java 怎样传递参数_运维文库_资讯中心

发布时间:2026-04-29 02:26:30

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要在C#中调用Java方法并传递参数，你可以使用Java Native Interface (JNI)

首先，创建一个Java类，例如MyClass.java，并定义一个方法，如下所示：

public class MyClass {
    public static int add(int a, int b) {
        return a + b;
    }
}

使用javac编译此Java文件，并使用javah生成JNI头文件MyClass.h：

javac MyClass.java
javah -jni MyClass

创建一个C#项目，并添加以下代码以加载Java类并调用add方法：

using System;
using System.Runtime.InteropServices;

class Program {
    static void Main() {
        // Load the Java class
        IntPtr javaLibrary = LoadJavaLibrary();

        // Create an instance of the Java class
        IntPtr myClassInstance = CreateJavaObject(javaLibrary, "MyClass");

        // Prepare the arguments for the Java method
        int a = 5;
        int b = 7;
        IntPtr methodId = GetMethodId(javaLibrary, myClassInstance, "add", "(II)I");

        // Call the Java method
        int result = CallIntMethod(javaLibrary, myClassInstance, methodId, a, b);

        Console.WriteLine("The sum is: " + result);

        // Unload the Java library
        UnloadJavaLibrary(javaLibrary);
    }

    static IntPtr LoadJavaLibrary() {
        return NativeLibrary.Load("path/to/your/java_library.dll");
    }

    static IntPtr CreateJavaObject(IntPtr javaLibrary, string className) {
        IntPtr env = GetJNIEnv();
        IntPtr cls = FindClass(env, className);
        IntPtr obj = CallObjectConstructor(env, cls);
        return obj;
    }

    static IntPtr GetMethodId(IntPtr javaLibrary, IntPtr obj, string methodName, string methodSignature) {
        IntPtr env = GetJNIEnv();
        return CallObjectMethod(env, obj, GetMethodIdMethodId, methodName, methodSignature);
    }

    static int CallIntMethod(IntPtr javaLibrary, IntPtr obj, IntPtr methodId, int a, int b) {
        IntPtr env = GetJNIEnv();
        return CallIntMethod(env, obj, methodId, a, b);
    }

    static void UnloadJavaLibrary(IntPtr javaLibrary) {
        NativeLibrary.Unload(javaLibrary);
    }

    // JNI helper methods (you need to implement these)
    static IntPtr GetJNIEnv() { /* ... */ }
    static IntPtr FindClass(IntPtr env, string className) { /* ... */ }
    static IntPtr CallObjectConstructor(IntPtr env, IntPtr cls) { /* ... */ }
    static IntPtr GetMethodIdMethodId { /* ... */ }
    static int CallIntMethod(IntPtr env, IntPtr obj, IntPtr methodId, int a, int b) { /* ... */ }
}