JNI-GO

library for calling java by golang through JNI

===

Install

• install jdk (install mingw with gcc on window)
• go get:

linux/unix/osx:

export CGO_CFLAGS="-I$JAVA_HOME/include/ -I$JAVA_HOME/include/<darwin/linux>"

export CGO_LDFLAGS="-L$JAVA_HOME/jre/lib/server -ljvm"

go get github.com/Centny/jnigo  

win32:

set CGO_CFLAGS=-I%JAVA_HOME%\include -I%JAVA_HOME%\include\win32

set CGO_LDFLAGS=-L%JAVA_HOME%\lib -ljvm

go get github.com/Centny/jnigo  

Example

func ExampleJvm() {
    Init("-Djava.class.path=java/bin")
    str_a, err := GVM.New("java.lang.String")
    if err != nil {
        panic(err.Error())
    }
    fmt.Println(str_a.CallInt("length"))
    //
    str_b, err := GVM.New("java.lang.String", "abc")
    if err != nil {
        panic(err.Error())
    }
    fmt.Println(str_b.CallInt("length"))
    fmt.Println(str_b.AsString())
    fmt.Println("---->")
}

func ExampleCovertType() {
    clsa := GVM.FindClass("Ljnigo/A;")
    obja, _ := clsa.New()
    objv, _ := obja.As("Ljava/lang/Object;")
    objs, _ := GVM.NewAry("Ljava/lang/Object;", 1)
    objs.SetObject(0, objv)
    fmt.Println(obja.CallVoid("show", objv))
    fmt.Println(obja.CallVoid("show", objs))
    show, err := obja.CallObject("show", "Ljava/lang/String;",
        true,              //for java boolean
        Byte(1),           //for java byte
        Char(1),           //for java char
        int16(1),          //for java short
        1,                 //for java int
        int64(1),          //for java long
        float32(1),        //for java float
        float64(1),        //for java double
        objv,              //for java Object
        "jjjjj",           //for java String
        []bool{false},     //for java boolean[]
        []Byte{1, 2},      //for java byte[]
        []Char{3, 4},      //for java char[]
        []int16{11, 12},   //for java short[]
        []int{21, 22},     //for java int[]
        []int64{31, 32},   //for java long[]
        []float32{41, 42}, //for java float[]
        []float64{51, 52}, //for java double[]
        objs,              //for java Object[]
        []string{"aaa"},   //for java String[]
    )
    if err != nil {
        t.Error(err.Error())
        return
    }
}