Spring SimpleCommandLineArgsParser

  • Author: HuiFer

  • 源码阅读仓库: SourceHot-spring

  • 类全路径: `org.springframework.core.env.SimpleCommandLineArgsParser

  • 类作用: 将命令行参数解析成 org.springframework.core.env.CommandLineArgs

  • 完整代码如下.

  2. class SimpleCommandLineArgsParser {
  4.     /**
  5.      * Parse the given {@code String} array based on the rules described {@linkplain
  6.      * SimpleCommandLineArgsParser above}, returning a fully-populated
  7.      * {@link CommandLineArgs} object.
  8.      * @param args command line arguments, typically from a {@code main()} method
  9.      */
  10.     public CommandLineArgs parse(String... args) {
  11.         CommandLineArgs commandLineArgs = new CommandLineArgs();
  12.         for (String arg : args) {
  13.             if (arg.startsWith("--")) {
  14.                 String optionText = arg.substring(2, arg.length());
  15.                 String optionName;
  16.                 String optionValue = null;
  17.                 if (optionText.contains("=")) {
  18.                     optionName = optionText.substring(0, optionText.indexOf('='));
  19.                     optionValue = optionText.substring(optionText.indexOf('=') + 1, optionText.length());
  20.                 }
  21.                 else {
  22.                     optionName = optionText;
  23.                 }
  24.                 if (optionName.isEmpty() || (optionValue != null && optionValue.isEmpty())) {
  25.                     throw new IllegalArgumentException("Invalid argument syntax: " + arg);
  26.                 }
  27.                 commandLineArgs.addOptionArg(optionName, optionValue);
  28.             }
  29.             else {
  30.                 commandLineArgs.addNonOptionArg(arg);
  31.             }
  32.         }
  33.         return commandLineArgs;
  34.     }
  36. }
  • 处理流程
    1. 循环命令行参数列表
    2. 去掉 -- 和 = 获取参数名称和参数值放入结果集合