参数和解释

测试代码

package flinktest;

public class PropertyTest {
    /**
     * @param args
     */
    public static void main(String[] args) {
        formatStr("java.version", "Java运行时环境版本");
        formatStr("java.vendor", "Java运行时环境供应商");
        formatStr("java.vendor.url", "Java供应商的URL");
        formatStr("java.home", "Java安装目录");
        formatStr("java.vm.specification.version", "Java虚拟机规范版本");
        formatStr("java.vm.specification.vendor", "Java虚拟机规范供应商");
        formatStr("java.vm.specification.name", "Java虚拟机规范名称");
        formatStr("java.vm.version", "Java虚拟机实现版本");
        formatStr("java.vm.vendor", "Java虚拟机实现供应商");
        formatStr("java.vm.name", "Java虚拟机实现名称");
        formatStr("java.specification.version", "Java运行时环境规范版本");
        formatStr("java.specification.vendor", "Java运行时环境规范供应商");
        formatStr("java.specification.name", "Java运行时环境规范名称");
        formatStr("java.class.versionJava", "类格式版本号");
        formatStr("java.class.path", "Java类路径");
        formatStr("java.library.path", "加载库时搜索的路径列表");
        formatStr("java.io.tmpdir", "默认的临时文件路径");
        formatStr("java.compiler", "要使用的JIT编译器的名称");
        formatStr("java.ext.dirs", "一个或多个扩展目录的路径");
        formatStr("os.name", "操作系统的名称");
        formatStr("os.arch", "操作系统的架构");
        formatStr("os.version", "操作系统的版本");
        formatStr("file.separator", "文件分隔符(在UNIX系统中是“/”)");
        formatStr("path.separator", "路径分隔符(在UNIX系统中是“:”)");
        formatStr("line.separator", "行分隔符(在UNIX系统中是“/n”)");
        formatStr("user.name", "用户的账户名称");
        formatStr("user.home", "用户的主目录");
        formatStr("user.dir", "用户的当前工作目录");
    }

    /**
     * 格式化字符串长度
     *
     * @param key
     * @param desc
     * @return
     */
    private static void formatStr(String key, String desc) {
        System.out.println(String.format("%-30s %-30s %s", key, desc, System.getProperty(key)));
    }
}

测试结果打印：

java.version                   Java运行时环境版本                    1.8.0_45
java.vendor                    Java运行时环境供应商                   Oracle Corporation
java.vendor.url                Java供应商的URL                    http://java.oracle.com/
java.home                      Java安装目录                       C:\Program Files\Java\jdk1.8.0_45\jre
java.vm.specification.version  Java虚拟机规范版本                    1.8
java.vm.specification.vendor   Java虚拟机规范供应商                   Oracle Corporation
java.vm.specification.name     Java虚拟机规范名称                    Java Virtual Machine Specification
java.vm.version                Java虚拟机实现版本                    25.45-b02
java.vm.vendor                 Java虚拟机实现供应商                   Oracle Corporation
java.vm.name                   Java虚拟机实现名称                    Java HotSpot(TM) 64-Bit Server VM
java.specification.version     Java运行时环境规范版本                  1.8
java.specification.vendor      Java运行时环境规范供应商                 Oracle Corporation
java.specification.name        Java运行时环境规范名称                  Java Platform API Specification
java.class.versionJava         类格式版本号                         null
java.class.path                Java类路径                        C:\Program Files\Java\jdk1.8.0_45\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jce.jar;C:\Program 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Files\JetBrains\IntelliJ IDEA 2020.2.4\lib\idea_rt.jar
java.library.path              加载库时搜索的路径列表                    C:\Program Files\Java\jdk1.8.0_45\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\NetSarang\Xftp 6\;C:\Program Files (x86)\NetSarang\Xshell 6\;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Java\jdk1.8.0_45\bin;C:\Program Files\Java\jdk1.8.0_45\jre\bin;D:\MyPath;C:\Program Files\Git\cmd;D:\program\mysql\bin;C:\Users\lenovo\AppData\Local\Microsoft\WindowsApps;;D:\Users\lenovo\AppData\Local\Programs\Microsoft VS Code Insiders\bin;C:\Program Files\Bandizip\;.
java.io.tmpdir                 默认的临时文件路径                      C:\Users\lenovo\AppData\Local\Temp\
java.compiler                  要使用的JIT编译器的名称                  null
java.ext.dirs                  一个或多个扩展目录的路径                   C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext;C:\Windows\Sun\Java\lib\ext
os.name                        操作系统的名称                        Windows 8.1
os.arch                        操作系统的架构                        amd64
os.version                     操作系统的版本                        6.3
file.separator                 文件分隔符(在UNIX系统中是“/”)            \
path.separator                 路径分隔符(在UNIX系统中是“:”)            ;
line.separator                 行分隔符(在UNIX系统中是“/n”)            

user.name                      用户的账户名称                        lenovo
user.home                      用户的主目录                         C:\Users\lenovo
user.dir                       用户的当前工作目录                      C:\Users\lenovo\IdeaProjects\ETL_Flink_V_Master