From d6d551c52b57f53f9de9eabc5d34aa6a3049b5c5 Mon Sep 17 00:00:00 2001
From: glight2000 <173959153@qq.com>
Date: Sat, 19 Dec 2015 10:26:44 +0800
Subject: [PATCH] Update 15.4.md
---
eBook/15.4.md | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/eBook/15.4.md b/eBook/15.4.md
index e69de29..2b94078 100644
--- a/eBook/15.4.md
+++ b/eBook/15.4.md
@@ -0,0 +1,53 @@
+# 15.4 写一个简单的网页应用
+
+下边的程序在端口8088上启动了一个网页服务器；`SimpleServer`会处理`/test1`url使它在浏览器输出`hello world`。`FormServer`会处理'/test2`url：如果url最初由浏览器请求，那么它就是一个`GET`请求，并且返回一个`form`常量，包含了简单的`input`表单，这个表单里有一个文本框和一个提交按钮。当在文本框输入一些东西并点击提交按钮的时候，会发起一个`POST`请求。`FormServer`中的代码用到了`switch`来区分两种情况。在`POST`情况下，使用`request.FormValue("inp")`通过文本框的`name`属性`inp`来获取内容，并写回浏览器页面。在控制台启动程序并在浏览器中打开url`http://localhost:8088/text2`来测试这个程序：
+
+示例 15.10 [simple_webserver.go](examples/chapter_15/simple_webserver.go)
+```go
+package main
+
+import (
+ "io"
+ "net/http"
+)
+
+const form = `
+
+
+
+`
+
+/* handle a simple get request */
+func SimpleServer(w http.ResponseWriter, request *http.Request) {
+ io.WriteString(w, "hello, world
")
+}
+
+func FormServer(w http.ResponseWriter, request *http.Request) {
+ w.Header().Set("Content-Type", "text/html")
+ switch request.Method {
+ case "GET":
+ /* display the form to the user */
+ io.WriteString(w, form)
+ case "POST":
+ /* handle the form data, note that ParseForm must
+ be called before we can extract form data */
+ //request.ParseForm();
+ //io.WriteString(w, request.Form["in"][0])
+ io.WriteString(w, request.FormValue("in"))
+ }
+}
+
+func main() {
+ http.HandleFunc("/test1", SimpleServer)
+ http.HandleFunc("/test2", FormServer)
+ if err := http.ListenAndServe(":8088", nil); err != nil {
+ panic(err)
+ }
+}
+```
+注：当使用字符串常量表示html文本的时候，包含``对于让浏览器识别它收到了一个html非常重要。
+
+