nodejs使用http模块编写上传图片接口测试客户端

1.搭个简易上传测试服务器

比如:python flask写简单服务器

请手动新建目录uploads用来保存文件

from flask import Flask, url_for, request,redirect,send_from_directory
import os 
app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = 'uploads/'  # 保存文件位置

ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif'])

@app.route('/uploads/')
def uploaded_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'], filename)

@app.route('/', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST': 
        file = request.files['file']
        if file : 
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], file.filename))
            return redirect(url_for('uploaded_file',
                                    filename=file.filename))
    return '''
    
    
上传测试
    
    

      

         
    
         
    
    '''


with app.test_request_context():  # 输出url
    pass
if __name__ == '__main__':
    # app.debug = True
    app.run()

2.观察上传头标识

运行服务器后打开浏览器访问,地址打开控制台,上传任意文件,进行观察

截图

截图

3.nodejs编写上传测试客户端

var http = require('http');
var querystring = require('querystring');
var fs = require('fs');

var post_data = { };//post提交数据

var content = querystring.stringify(post_data);//将对象转换成字符串，字符串里多个参数将用 ‘&' 分隔，将用 ‘=' 赋值

var boundaryKey = new Date().getTime();//创建随机切割标识字 你可以百度 'multipart form-data boundary'了解
//var boundaryKey =Math.random().toString(16); 

var options = {
    hostname: '127.0.0.1',
    port: 5000,
    path: '/',
    method: 'POST',
    headers: {
        // 'Accept': '*/*',
        // 'Accept-Encoding': 'gzip, deflate',
        // 'Connection': 'keep-alive',
        'Content-Type':'multipart/form-data; boundary=----'+boundaryKey,//文件上传标识与切割标识
        // 'Host':'127.0.0.1:5000',
        // 'Origin':'http://127.0.0.1:5000',
        // 'Referer':'http://127.0.0.1:5000/',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36'
    }
};

var req = http.request(options, function (res) {
    res.setEncoding('utf8');
    console.log('STATUS: ' + res.statusCode);
    console.log('HEADERS: ' + JSON.stringify(res.headers));
    res.on('data', function (chunk) {
        console.log('BODY: ' + chunk);
    });
    res.on('end', function () {
        console.log('res end');
    });
});

var payload ='\r\n------'+boundaryKey+'\r\n' +
    'Content-Disposition: form-data; name="file"; filename="test.png"\r\n' +
    'Content-Type: image/png\r\n\r\n';

var enddata = '\r\n------'+boundaryKey+'--'; 

req.setHeader('Content-Length', Buffer.byteLength(payload) + Buffer.byteLength(enddata) + fs.statSync("./test.png").size);
req.write(payload);

var fileStream = fs.createReadStream("./test.png", { bufferSize: 4 * 1024 });
fileStream.pipe(req, { end: false });
fileStream.on('end', function () { 
    req.end(enddata);
});

req.on('error', function (e) {
    console.log('problem with request: ' + e.message);
});
  
req.write(content);
// req.end();   

还有种写法:

var http = require('http');
var querystring = require('querystring');
var fs = require('fs');

var boundaryKey = new Date().getTime()//Math.random().toString(16); //创建随机切割标识字

var options = {
    hostname: '127.0.0.1',
    port: 5000,
    path: '/',
    method: 'POST',
    headers: {
        // 'Accept': '*/*',
        // 'Accept-Encoding': 'gzip, deflate',
        // 'Connection': 'keep-alive',
        'Content-Type': 'multipart/form-data; boundary=----' + boundaryKey,
        // 'Host':'127.0.0.1:5000',
        // 'Origin':'http://127.0.0.1:5000',
        // 'Referer':'http://127.0.0.1:5000/',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36'
    }
};

var req = http.request(options, function (res) {
    res.setEncoding('utf8');
    console.log('STATUS: ' + res.statusCode);
    console.log('HEADERS: ' + JSON.stringify(res.headers));
    res.on('data', function (chunk) {
        console.log('BODY: ' + chunk);
    });
    res.on('end', function () {
        console.log('res end');
    });
});

var payload = '\r\n------' + boundaryKey + '\r\n' +
    'Content-Disposition: form-data; name="file"; filename="test.png"\r\n' +
    'Content-Type: image/png\r\n\r\n';
var enddata = '\r\n------' + boundaryKey + '--';

var fileStream=fs.readFileSync("./test.png");
req.setHeader('Content-Length', Buffer.byteLength(payload) + Buffer.byteLength(enddata) + fs.statSync("./test.png").size);
console.log(payload);
req.write(payload);
console.log(fileStream);
req.write(fileStream);
console.log(enddata);
req.end(enddata);
req.on('error', function (e) {
    console.log('problem with request: ' + e.message);
});

使用Node-Fetch实现上传请参考文章:https://www.jianshu.com/p/34f72dbb5f13