Shell脚本字符转义失败求助：JVM参数配置报错

我配置了如下Windows批处理脚本（注：这是.cmd/.bat格式的Windows脚本，并非Shell脚本）：

set "JSSE_OPTS=-Djdk.tls.ephemeralDHKeySize=2048"
set "JAVA_OPTS=%JAVA_OPTS% %JSSE_OPTS%"
set "PATH_OPTS=-Drelaxed-path-chars=^"\"^<^>[\\]^`{^|}"^"
set "JAVA_OPTS=%JAVA_OPTS% %PATH_OPTS%"
set "QUERY_OPTS=-Drelaxed-query-chars=^"\"^<^>[\\]^`{^|}"^"
set "JAVA_OPTS=%JAVA_OPTS% %QUERY_OPTS%"

运行时出现报错：

There should be no > at this time.

需求是通过JVM参数配置允许特殊字符：

relaxed-path-chars: \"<>[\]^`{|}
relaxed-query-chars: \"<>[\]^`{|}

问题根源是Windows批处理的特殊字符转义逻辑错误，以下是修正后的两种可行方案：

方案一：双引号内直接转义（推荐） #

利用Windows批处理中双引号包裹变量时的转义规则，内部双引号仅用\转义即可，其他特殊字符无需额外转义：

set "JSSE_OPTS=-Djdk.tls.ephemeralDHKeySize=2048"
set "JAVA_OPTS=%JAVA_OPTS% %JSSE_OPTS%"
set "PATH_OPTS=-Drelaxed-path-chars=\"<>[\]^`{|}"
set "JAVA_OPTS=%JAVA_OPTS% %PATH_OPTS%"
set "QUERY_OPTS=-Drelaxed-query-chars=\"<>[\]^`{|}"
set "JAVA_OPTS=%JAVA_OPTS% %QUERY_OPTS%"

方案二：全局转义特殊字符 #

不依赖双引号内部规则，用批处理的转义符^处理所有特殊字符：

set JSSE_OPTS=-Djdk.tls.ephemeralDHKeySize=2048
set JAVA_OPTS=%JAVA_OPTS% %JSSE_OPTS%
set PATH_OPTS=-Drelaxed-path-chars=^"^<^>[\]^`{^|}
set JAVA_OPTS=%JAVA_OPTS% %PATH_OPTS%
set QUERY_OPTS=-Drelaxed-query-chars=^"^<^>[\]^`{^|}
set JAVA_OPTS=%JAVA_OPTS% %QUERY_OPTS%

验证方式 #

在脚本末尾添加echo %JAVA_OPTS%，执行后查看输出是否符合预期：

echo %JAVA_OPTS%

预期输出应包含：
-Djdk.tls.ephemeralDHKeySize=2048 -Drelaxed-path-chars="<>[\]^{|}" -Drelaxed-query-chars="<>[]^{|}"

内容的提问来源于stack exchange，提问作者wenliangzeng-coder