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Update 15.2.md
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@@ -25,7 +25,48 @@ Http是一个比tcp更高级的协议,它描述了客户端浏览器如何与
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示例 15.6 [hello_world_webserver.go](examples/chapter_15/hello_world_webserver.go):
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```go
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package main
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import (
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"fmt"
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"log"
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"net/http"
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)
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func HelloServer(w http.ResponseWriter, req *http.Request) {
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fmt.Println("Inside HelloServer handler")
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fmt.Fprintf(w, "Hello,"+req.URL.Path[1:])
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}
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func main() {
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http.HandleFunc("/", HelloServer)
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err := http.ListenAndServe("localhost:8080", nil)
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if err != nil {
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log.Fatal("ListenAndServe: ", err.Error())
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}
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}
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```
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使用命令行启动程序,会打开一个命令窗口显示如下文字:
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```
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Starting Process E:/Go/GoBoek/code_examples/chapter_14/hello_world_webserver.exe
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...
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```
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然后打开你的浏览器并输入url地址:`http://localhost:8080/world`,浏览器就会出现文字:`Hello, world`,网页服务器会响应你在`:8080/`后边输入的内容
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使用`fmt.Println`在控制台打印状态,在每个handler被请求的时候,在他们内部打印日志会很有帮助
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注:
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1)前两行(没有错误处理代码)可以替换成以下写法:
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```go
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http.ListenAndServe(":8080", http.HandlerFunc(HelloServer))
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```
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2)`fmt.Fprint`和`fmt.Fprintf`都是用来写入`http.ResponseWriter`的不错的函数(他们实现了`io.Writer`)。
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比如我们可以使用
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```go
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fmt.Fprintf(w, "<h1>%s<h1><div>%s</div>", title, body)
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```
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来构建一个非常简单的网页并插入`title`和`body`的值
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如果你需要更多复杂的替换,使用模板包(请看[章节15.7](15.7.md))
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