How to testfor a dropped item?

Solution 1:

You want this command:

/testfor @e[type=Item] {Item:{tag:{display:{Name:"spear"}}}}

Or, if you have more items named "spear" use this:

/testfor @e[type=Item] {Item:{id:minecraft:stick,tag:{display:{Name:"spear"}}}}

Now just hook this on a Redstone clock/Put it into a Repeat Command block and you're done!

If you have only 1 command following this, use tags and the /execute command:

/scoreboard players tag @e[type=Item] add IsSpear {Item:{tag:{display:{Name:spear}}}}

And instead of the /testfor command use /execute:

/execute @e[type=Item,tag=IsSpear] ~ ~ ~ /yourcommand