command line - How to start a process from Java with arguments which contain double-quotes -


i need start second java process java program, , 1 of arguments forked process need contain literal double-quote characters ("). how do in portable way, i.e. @ least works on linux , windows?

i tried use processbuilder (which introduced overcome problems of runtime class, right?) array of strings command line, still there problem parameter containing quote:

list<string> commandline = new arraylist<string>(); commandline.add(new file(system.getproperty("java.home") + "/bin/java").getabsolutepath()); commandline.addall(arrays.aslist("-jar", "plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar", "-application", "org.eclipse.equinox.p2.director", "-repository", "http://download.eclipse.org/releases/juno")); commandline.add("-list"); commandline.add("q:select(x | x.id == \"org.eclipse.sdk.ide\")");  new processbuilder().command(commandline).directory(eclipseinstallationdir).start().waitfor();

the code above doesn't work (on windows) because processbuilder (or else) eats double quotes in last argument:

instead of q:select(x | x.id == "org.eclipse.sdk.ide"), process receives argument q:select(x | x.id == org.eclipse.sdk.ide) , fails.

i figured out can make work on windows adding \" in argument need " i.e.

commandline.add("q:select(x | x.id == \"org.eclipse.sdk.ide\")".replace("\"", "\\\""));

but breaks invocation on linux (as morgano confirmed). i'm forced detect os again. there no simple, portable way start process in java arguments content of string array?

normally, command argument string split around spaces form array of arguments. however, if want single argument contain space, can wrap argument in quotes. later, each pair of quotes removed string. it's not java removing these quotes--it's operating system this.

processbuilder wrapping each of arguments supply in quotes if of arguments contains space, not split multiple arguments further down road operating system (you can hack supplying 1234\" \"5678; end being 2 arguments: 1234, , 5678). processbuilder concatenates arguments 1 command, passes operating system. later, operating system splits command string whitespace , quotes (as described above), , removes pairs of quotes each string argument before begins new process. escape quote (i.e. treat regular character not handled differently os parser), use backslash character before it. command line escape character both linux , windows. like: \\\".


Comments

Post a Comment

Popular posts from this blog

image - ClassNotFoundException when add a prebuilt apk into system.img in android -

i'm in trouble add prebuilt apk system.img based taiwan mtk android phone platform, when push apk onto device,after reboot phone,the apk can installed succecessfully,but if add apk alps/out/target/product/$prj/system/app or vendor/mediatek/$prj/artifacts/out/target/product/$prj/system/app ,and produce system.img,the apk can't installed normally,the logcat say: a.lang.runtimeexception: unable instantiate activity componentinfo{com.sec.android.widgetapp.ap.hero.accuweather.widget/com.sec.android.widgetapp.ap.hero.accuweather.widget.weatherclock}: java.lang.classnotfoundexception: com.sec.android.widgetapp.ap.hero.accuweather.widget.weatherclock. can tell me what's problem ? when package manager installs apps part of system partition different installing apps on data partition. looks app using libraries somewhere else. when install on data lib directory created in apps data directory , symlinked /data/app-lib/. when apps installed on system it's expecte...
Read more

I need to import mysql 5.1 to 5.5? -

i have mysql 5.1 database , need import localhost running 5.5. how import 5.5 or downgrade mysql? install phpmyadmin 5.1 os: http://www.wikihow.com/install-phpmyadmin-on-your-windows-pc or https://www.digitalocean.com/community/articles/how-to-install-and-secure-phpmyadmin-on-ubuntu-12-04 then login, click on database, hit export, , export in sql format (quick fine). import .sql file 5.5 server (after installing phpmyadmin) logging in clicking database , hit import. hope helps!
Read more

Java, Hibernate, MySQL - store UTC date-time -

i saw here on few related questions (like this one , of course, this one )... essentially, want store date-time utc, , let application user choose time zone wants display date-time in. since seems date-time fields affected underlying jdbc driver, wonder if acceptable way go storing utc date-time: set both mysql , application server machine utc time zone (no need separate) both mysql , jvm should pick underlying system time settings (if not instructed otherwise) use datetime table columns on mysql side use java.util.date corresponding mapping on hibernate side (i guess java.sql.timestamp used too) let application worry interpreting date-time fields - i.e. let user choose preferred time zone is ok? edit clarify - here meant refer timestamps created strictly on server (e.g.date-time of record creation). application server instantiates date objects (new date() equals current date-time on server, , time zone agnostic). if client user wants supply date searching/filte...
Read more