Go 项目中的多个主要文件

Question

I have a Go project. When I run the program main.go (with function main ), it serves a web server serving a JSON object.

In the same folder I have another file serializedata.go (with function main ) which writes the JSON object into a file that is served by the web server.

Now, when I try to run go install I get this error:

./serialize_data.go:17: main redeclared in this block previous declaration at ./main.go:13

I want to keep both these files together as they are related. The test data needs to be serialized before it can be served.

How can I prevent to build the serialization.go file?

I'm from python world and there it's easy to have these utils files separately.

Answer 1

serialize_data.go 应该放在另一个文件夹中，然后go run serialize_data.go

Answer 2

Create a file in main package named serialization.go . but change the name of the function main with the any exported function with upper case letter and then call it inside the main.go file. Each package can have only a single main file. So if you want to create a file with main() function inside it declare in another package.

For eg your main.go should looks like.

package main

func main(){
    Serialize()
}

Inside serialization.go file use as

package main

func Serialize(){
   fmt.Println("Serialize")
}

Call above function inside main for serving on web browser

Answer 3

While not nessarily a good idea, if you avoid go install you can build several executables from the same folder just fine. One of my projects has a tools folder with several executables, that I build using go build . Eg:

$ ls
Makefile cat.go find.go ls.go
$ cat Makefile
%: %.go
    go build -o $@ $<
$ make ls
go build -o ls ls.go
$ ./ls
Makefile cat.go find.go ls.go