nodejs模仿http请求组件nodegrass简单例子

1、搭建nodejs环境。

2、执行npm install nodegrass命令。

3、引入模块，var ng= require(nodegrass);

4、下面先看nodegrass底层的get方法的具体实现，代码如下：

//Get Method Request
//Support HTTP and HTTPS request,and Automatic recognition
//@Param url
//@Param callback
NodeGrass.prototype.get = function(url,callback, reqheaders, charset){
  var protocol = getProtocol(url);
  var _defaultCharSet = 'utf8';
  
  if(typeof charset === 'string' ){
    _defaultCharSet = charset;
  }
  if(typeof(reqheaders) === "string" && charset === undefined) {
    _defaultCharSet = reqheaders;
  }
  var newheader = {};
  if(reqheaders !== undefined && typeof(reqheaders) === "object") {
    for(var ele in reqheaders) {
      newheader[ele.toLowerCase()] = reqheaders[ele];
    }
  }
  newheader["content-length"] = 0;
  var options = {
    host:getHost(url),
    port:getPort(url),
    path:getPath(url),
    method:'GET',
    headers:newheader
  };
   
  if(protocol === http || protocol === https){
     return _sendReq(protocol,null,options,_defaultCharSet,callback);
  }else{
    throw "sorry,this protocol do not support now";
  }

}

　　

从中可以看出，只需要在方法调用中，加入如下参数即可：

url请求地址,

callback回调函数,

reqheaders请求头标识,一般使用    'Content-Type': 'application/x-www-form-urlencoded'

charset编码方式，一般为utf8

对应的post请求的底层实现代码如下：

//Post Method Request
//Support HTTP and HTTPS request,and Automatic recognition
//@Param url
//@Param callback
//@Param header
//@param postdata
NodeGrass.prototype.post = function(url,callback,reqheaders,data,charset){
  var protocol = getProtocol(url);
  var _defaultCharSet = 'utf8';
  
  if(typeof charset === 'string' ){
    _defaultCharSet = charset;
  }

  if(typeof(data) === 'object'){data = querystring.stringify(data);}
  var options={
      host:getHost(url),
      port:getPort(url),
      path:getPath(url),
      method:'POST',
      headers:reqheaders
    };
  if(protocol === http || protocol === https){
    return _sendReq(protocol,data,options,_defaultCharSet,callback)
  }else{
    throw "sorry,this protocol do not support now";
  }
}

　　

从中可以看出，只需要在方法调用中，加入如下参数即可：

url请求地址,

callback回调函数,

reqheaders请求头标识,一般使用    'Content-Type': 'application/x-www-form-urlencoded'

data请求所包含的具体数据,

charset编码方式，一般为utf8

封装代码如下：

var nodegrass = require('nodegrass');
var REQ_HEADERS = {
		'Content-Type' : 'application/x-www-form-urlencoded'
	};

// get请求
exports.ngGet = function(url, params, encoding) {
	if (!encoding) {
		encoding = "UTF-8";
	}
	var result = "";
	nodegrass.get(url, function(data, status, headers) {
		console.log(status);
		console.log(headers);
		console.log(data);
		result = data;
	}, REQ_HEADERS, params, encoding).on('error', function(e) {
		console.log("Got error: " + e.message);
	});
	return result;
};

// post请求
exports.ngPost = function(url, params, encoding) {
	if (!encoding) {
		encoding = "UTF-8";
	}
	var result = "";
	nodegrass.post(url, function(data, status, headers) {
		console.log(status);
		console.log(headers);
		console.log(data);
		result = data;
	}, REQ_HEADERS, params, encoding).on('error', function(e) {
		console.log("Got error: " + e.message);
	});

	return result;
}