So, I've been using rhino to whip together my java experiments lately. Setup is trivial, you just need java and js.jar.
- download rhino
- extract js.jar (at least)
- for an interactive shell, run java -jar js.jar
- or run a script using java -jar js.jar some-javascript-file.js
Once you have rhino, all sorts of java-ish things can be whipped up as quick hacks.
A quick http server, for example, goes something like this:
function main() {
var s = new java.net.ServerSocket(8080)
while (true) {
var client = s.accept()
var sc = new java.util.Scanner(client.getInputStream())
var method = sc.next()
var path = '.' + sc.next()
var out = new java.io.PrintWriter(
new java.io.OutputStreamWriter(client.getOutputStream()))
try {
var f = new java.io.FileInputStream(path)
out.println("HTTP/1.1 200 Success")
out.println("Content-Type: text/html")
out.println()
for (var c = f.read(); c != -1; c = f.read())
out.write(c)
} catch (e if e.javaException
instanceof java.io.FileNotFoundException) {
out.println("HTTP/1.1 404 File not found")
out.println("Content-Type: text/html")
out.println()
out.println("<html><body>")
out.println("<h1>File not found</h1>")
out.println("</body></html>")
}
out.flush()
out.close()
}
}
main()
Wait, what about a threaded server you say? Try this on for size.
function main() {
var s = new java.net.ServerSocket(8080)
while (true) {
var client = s.accept()
var t = java.lang.Thread(function() {
var sc = new java.util.Scanner(client.getInputStream())
var method = sc.next()
var path = '.' + sc.next()
var out = new java.io.PrintWriter(
new java.io.OutputStreamWriter(client.getOutputStream()))
try {
var f = new java.io.FileInputStream(path)
out.println("HTTP/1.1 200 Success")
out.println("Content-Type: text/html")
out.println()
for (var c = f.read(); c != -1; c = f.read())
out.write(c)
} catch (e if e.javaException
instanceof java.io.FileNotFoundException) {
out.println("HTTP/1.1 404 File not found")
out.println("Content-Type: text/html")
out.println()
out.println("<html><body>")
out.println("<h1>File not found</h1>")
out.println("</body></html>")
}
out.flush()
out.close()
}
)
t.start()
}
}
main()
For more reading about rhino and javascript including how to structure, organize, and manage your code for larger projects, try these great posts.
http://steve-yegge.blogspot.com/2008/06/rhinos-and-tigers.html
http://www.adequatelygood.com/2010/3/JavaScript-Module-Pattern-In-Depth
http://peter.michaux.ca/articles/javascript-widgets-without-this
http://www.jspatterns.com/