1 前言
项目需要用nodejs服务器给前端传递图片，网上找了好多资料，多数都是怎么在前端上传图片的，然后通过看runoob.com菜鸟教程，发现其实是非常简单，用express框架就行了。
2 代码
2.1 用原生的版本（包含了返回网页功能）
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var
http = require(
'http'
);
var
fs = require(
'fs'
);
var
url = require(
'url'
);
// 创建服务器
http.createServer(
function
(request, response) {
// 解析请求，包括文件名
var
pathname = url.parse(request.url).pathname;
// 输出请求的文件名
console.log(
"Request for "
+ pathname +
" received."
);
// 从文件系统中读取请求的文件内容
fs.readFile(pathname.substr(1),
function
(err, data) {
var
urlContent = pathname.substr(1);
if
(urlContent.lastIndexOf(
"png"
) > -1){
if
(err) {
console.log(err);
// HTTP 状态码: 404 : NOT FOUND
// Content Type: text/plain
response.writeHead(404, {
'Content-Type'
:
'text/html'
});
}
else
{
// HTTP 状态码: 200 : OK
// Content Type: text/plain
response.writeHead(200, {
'Content-Type'
:
'image/png'
});
var
imageFilePath = pathname.substr(1);
var
stream = fs.createReadStream( imageFilePath );
var
responseData = [];
//存储文件流
if
(stream) {
//判断状态
stream.on(
'data'
,
function
( chunk ) {
responseData.push( chunk );
});
stream.on(
'end'
,
function
() {
var
finalData = Buffer.concat( responseData );
response.write( finalData );
response.end();
});
}
}
}
else
if
(urlContent.lastIndexOf(
"html"
) > -1){
if
(err) {
console.log(err);
// HTTP 状态码: 404 : NOT FOUND
// Content Type: text/plain
response.writeHead(404, {
'Content-Type'
:
'text/html'
});
}
else
{
// HTTP 状态码: 200 : OK
// Content Type: text/plain
response.writeHead(200, {
'Content-Type'
:
'text/html'
});
// 响应文件内容
response.write(data.toString());
}
// 发送响应数据
response.end();
}
else
{
console.log(
"unSupport Type, Please contact Administrator err url="
+urlContent);
}
});
}).listen(80);
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2.2 用Express框架版本
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var
express = require(
'express'
);
var
app = express();
app.use(express.
static
(
'public'
));
app.get(
'/public/images/*'
,
function
(req, res) {
res.sendFile( __dirname +
"/"
+ req.url );
console.log(
"Request for "
+ req.url +
" received."
);
})
app.get(
'/public/html/index.html'
,
function
(req, res) {
res.sendFile( __dirname +
"/"
+
"/public/html/index.html"
);
console.log(
"Request for "
+ req.url +
" received."
);
})
//如果访问网页和本地同名，可以使用以下版本
app.get(
'/public/html/*.html'
,
function
(req, res) {
res.sendFile( __dirname +
"/"
+ req.url );
console.log(
"Request for "
+ req.url +
" received."
);
})
app.get(
'/public/register'
,
function
(req, res) {
res.sendFile( __dirname +
"/"
+
"/public/html/register.html"
);
console.log(
"Request for "
+ req.url +
" received."
);
})
var
server = app.listen(80,
function
() {
console.log(
'Server running at http://127.0.0.1:80/'
);
})
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