frida打印class的信息--java反射

function printClass(c){
    var str = "-------------------------------
";
    str += "|" + JSON.stringify(c) + "
";
    var fields = c.getClass().getFields();
    for(var index in fields){
        var field = fields[index];
        var fieldName = "";
        var value = "";
        try{
            fieldName = field.getName();
            value = field.get(c);
        }catch(e){

        }
        if(fieldName == ""){
            continue;
        }
        str += "|" + fieldName + ":" + printValue(value) + "
";
    }
    str += "------------------------------


";
    return str;
}

function printValue(value){
    try{
        var newValue = Java.cast(value, Java.use("java.lang.Object"))
        switch(newValue.getClass().getName()){
            case "[B":
                return printBytes(value)
        }
        return value;
    }catch(e){
        return value;
    }
}

function printBytes(result){
    try{
        var ByteArrayOutputStreamClass = Java.use("java.io.ByteArrayOutputStream");
        var out = ByteArrayOutputStreamClass.$new()
        var ObjectOutputStreamClass = Java.use("java.io.ObjectOutputStream");
        var sOut = ObjectOutputStreamClass.$new(out);
        sOut.writeObject(result);
        sOut.flush();
        var bytes = out.toByteArray();
        var argsArray = [];
        for(var i = 0; i < bytes.length; i++) {
            argsArray.push(bytes[i]);
        }
        return "["+argsArray.join(",")+"]";
    }catch(e){
        console.log(e);
        return result;
    }
}