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我目前正在开发一个R包来在R中集成Java代码。但是,我遇到了尝试正确调用java类方法的问题。到目前为止,我已经独立开发并编译了一个Java程序到一个类文件中,然后将其打包为一个jar文件。我的代码样本如下:rjava .jcall问题
library(rJava)
.jinit()
.onLoad <- function(lib, pkg) {
pathToSdk <- paste(system.file(package = "mailViz") , "C:\\path\\to\\libs", sep="")
jarPaths <- c(paste(pathToSdk, "mail.jar", sep=""),
paste(pathToSdk, "mailReader.jar", sep="")
)
.jpackage(pkg, morePaths=jarPaths)
attach(javaImport(c("java.lang", "java.io", "java.mail", "java.util", "java.text")))
packageStartupMessage(paste("mailViz loaded. The classpath is: ", paste(.jclassPath(), collapse=" ")))
}
# get method arguments for the class
#.jmethods("mailReader","readEmailInfo")
z=.jcall("mailReader", "Ljava/lang/String;", "readEmailInfo", "username", "password")
然而,当我执行.jcall功能我收到一个错误:
Error in .jcall("mailReader", "Ljava/lang/String;", "readEmailInfo", "username", :
method readEmailInfo with signature (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String; not found
我试图改变参数,但没有运气的多种方式。当我运行的类文件.jmethods(“邮件阅读器”),它列出了所有可用的方法:到
[2] "public java.lang.String mailReader.readEmailInfo(java.lang.String,java.lang.String)"
所以,我在如何进行正确调用传递两个参数(用户名,密码)很失落java类文件。
有什么想法?在此先感谢,
P