Nodejs中Express 常用中间件 body-parser 实现解析

var arr = [];
var chunks;

req.on('data', buff => {
arr.push(buff);
});

req.on('end', () => {
chunks = Buffer.concat(arr);
done(chunks);
});
};

var server = http.createServer(function (req, res) {
parsePostBody(req, (chunks) => {
var body = chunks.toString();
res.end(`Your nick is ${body}`)
});
});

server.listen(3000);

解析application/json

客户端代码如下，把

Content-Type

换成

application/json

。

var http = require('http');
var querystring = require('querystring');
var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Content-Encoding': 'identity'
  }
};
var jsonBody = {
  nick: 'chyingp'
};
var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});
client.end( JSON.stringify(jsonBody) );

服务端代码如下，相比

text/plain

，只是多了个

JSON.parse()

的过程。

var http = require('http');
var parsePostBody = function (req, done) {
  var length = req.headers['content-length'] - 0;
  var arr = [];
  var chunks;
  req.on('data', buff => {
    arr.push(buff);
  });
  req.on('end', () => {
    chunks = Buffer.concat(arr);
    done(chunks);
  });
};
var server = http.createServer(function (req, res) {
  parsePostBody(req, (chunks) => {
    var json = JSON.parse( chunks.toString() );  // 关键代码
    res.end(`Your nick is ${json.nick}`)
  });
});
server.listen(3000);

解析application/x-www-form-urlencoded

客户端代码如下，这里通过

querystring

对请求体进行格式化，得到类似

nick=chyingp

的字符串。

var http = require('http');
var querystring = require('querystring');
var options = {
  hostname: '127.0.0.1',
  port: '3000',
  path: '/test',
  method: 'POST',
  headers: {
    'Content-Type': 'form/x-www-form-urlencoded',
    'Content-Encoding': 'identity'
  }
};
var postBody = { nick: 'chyingp' };
var client = http.request(options, (res) => {
  res.pipe(process.stdout);
});
client.end( querystring.stringify(postBody) );

服务端代码如下，同样跟

text/plain								 
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