Golang JSON封送处理

Question

I'm trying to marshal an array into a string, separating all elements with newlines. I'm running out of memory and think about a more efficient way to do this.

buffer := ""
for _, record := range all_data {

    body, _ := json.Marshal(record)
    buffer += string(body) + "
" // i run out of memory here

Question:

Is there a way to append a newline character to a byte array? Right now I'm casting via string(body), but I think that this operation allocates a lot of memory (but maybe I'm wrong).

Answer 1

Assuming your data isn't inherently too big for the computer it's running on, the problem is likely the inefficient building of that string. Instead you should be using a bytes.buffer and then callings it's String() method. Here's an example;

var buffer bytes.Buffer

for _, record := range all_data {
    body, _ := json.Marshal(record)
    buffer.Write(body)
    buffer.WriteString("
")
}

fmt.Println(buffer.String())