// 通过报头的Transfer-Encoding或Content-Length即可判断请求中是否带有内容
var hasBody = function(req) {return 'transfer-encoding' in req.headers || 'content-length' in req.headers;
};// 在HTTP_Parser解析报头结束后,报文内容部分会通过data事件触发
function (req, res) {if (hasBody(req)) {var buffers = [];req.on('data', function (chunk) {buffers.push(chunk);});req.on('end', function () {req.rawBody = Buffer.concat(buffers).toString();handle(req, res);});} else {handle(req, res);}
}
表单数据:最为常见的数据提交就是通过网页表单提交数据到服务器端:
<form action="/upload" method="post"><label for="username">Username:</label> <input type="text" name="username" id="username" /><br /><input type="submit" name="submit" value="Submit" />
</form>
// 默认的表单提交,请求头的Content-Type字段值为application/x-www-form-urlencoded
// 即:Content-Type: application/x-www-form-urlencoded
// 解析
var handle = function(req, res) {if (req.headers['content-type'] === 'application/x-www-form-urlencoded') {req.body = querystring.parse(req.rawBody);}todo(req, res);
};
其他格式: JSON和XML文件等,判断和解析他们的原理都比较相似,都是依据Content-Type中的值决定,其中JSON类型的值
为application/json,XML的值为application/xml
// JSON文件
// 对于Node来说,要处理它不需要额外的任何库
var handle = function(req, res) {if (mime(req) === 'application/json') {try {req.body = JSON.parse(req.rawBody);} catch (e) {// 异常内容,响应Bad requestres.writeHead(4000);res.end('Invalid JSON);return;}}todo(req, res);};// XML文件
var xml2js = require('xml2js');
var handle = function (req, res) {if (mime(req) === 'application/xml') {xml2js.parseString(req.rawBody, function (err, xml) {if (err) {// 异常内容, 响应Bad requestres.writeHead(400);res.end('Invalid XML');return;}req.body = xml;todo(req, res);});}
};
