Rstudio 安装xlsx包时遇到Java interpreter, rJava, jni.h 等问题的解决方法

~$ java -version

初学R语言，尝试在Rstudio中安装xlsx包

> install.packages('xlsx')

报错，/usr/lib/jvm/default-java/jre/bin/java: No such file or directory, 具体内容如下：

checking Java support in R... present:
interpreter : '/usr/lib/jvm/default-java/jre/bin/java'
archiver    : '/usr/lib/jvm/default-java/bin/jar'
compiler    : '/usr/lib/jvm/default-java/bin/javac'
header prep.: '/usr/lib/jvm/default-java/bin/javah'
cpp flags   : '-I/usr/lib/jvm/default-java/include'
java libs   : '-L/usr/lib/jvm/default-java/jre/lib/amd64/server -ljvm'
checking whether Java run-time works... ./configure: line 3736: /usr/lib/jvm/default-java/jre/bin/java: No such file or directory
no
configure: error: Java interpreter '/usr/lib/jvm/default-java/jre/bin/java' does not work
ERROR: configuration failed for package ‘rJava’
* removing ‘/home/wuqili/R/x86_64-pc-linux-gnu-library/3.2/rJava’
Warning in install.packages :
  installation of package ‘rJava’ had non-zero exit status
ERROR: dependency ‘rJava’ is not available for package ‘xlsxjars’
* removing ‘/home/wuqili/R/x86_64-pc-linux-gnu-library/3.2/xlsxjars’
Warning in install.packages :
  installation of package ‘xlsxjars’ had non-zero exit status
ERROR: dependencies ‘rJava’, ‘xlsxjars’ are not available for package ‘xlsx’
* removing ‘/home/wuqili/R/x86_64-pc-linux-gnu-library/3.2/xlsx’
Warning in install.packages :
  installation of package ‘xlsx’ had non-zero exit status

The downloaded source packages are in
	‘/tmp/RtmpIgTO8o/downloaded_packages’

既然java not work, 所以在终端输入 java -version 查看

root:~$ java -version
程序 'java' 已包含在下列软件包中：
 * default-jre
 * gcj-5-jre-headless
 * openjdk-8-jre-headless
 * gcj-4.8-jre-headless
 * gcj-4.9-jre-headless
 * openjdk-9-jre-headless
请尝试：sudo apt install <选定的软件包>

根据提示，选择安装default-jre

root:~$ sudo apt install default-jre

安装成功后，再次检查java -version

root:~$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-2ubuntu1.16.04.3