由于项目在做前后端分离，牵扯跨域和夸协议问题，临时抱佛脚，选择用nodejs做中转，我想应该好多人都用它。但是做普通的表单转发没啥问题，当处理附件上传转发时，各种蛋疼，已解决！
1.项目比较特殊，后台拥有两个平台，一个java一个donet，比较鸡肋，具体什么原因就不解释了。
2.当做node转发时，刚开始没有转发文件的操作，就做的很简单，用户传过来啥就，拦截到，进行转发，一切都很ok！
3.文件转发，就很麻烦。我的思路，将用户上传的文件存到node服务器。使用formidable 。
通过npm安装：
rush:js;">
npm install formidable@latest
再通过文件包重组。进行上传。注意此处上传必须遵循w3c上传文件表单标准，具体自己查资料。
其实思路很简单，但是实际操作起来还是挺麻烦，我中间也趟了好多坑，也是自己node不成熟，毕竟只是用来做中转！
server.js,用于启动服务并转发。
>>>>" + prams);
const postData = prams;
console.log("client pramsJson>>>>>" + postData);
var contenttype = request.headers['content-type'];
if (contenttype == undefined || contenttype == null || contenttype == '') {
var opt = {
host: javaServerhost,//跨域访问的主机ip
port: javaServerport,path: "/hrrp" + clientUrl2,headers: {
'Content-Length': Buffer.byteLength(postData)
}
}
} else {
var opt = {
host: javaServerhost,headers: {
'Content-Type': request.headers['content-type'],'Content-Length': Buffer.byteLength(postData)
}
}
}
var body = '';
console.log('method',opt.method);
var req = http.request(opt,function (res) {
//console.log("response: " + res.statusCode);
res.on('data',function (data) {
body += data;
}).on('end',function () {
response.write(body);
response.end();
//console.log("end:>>>>>>>" + body);
});
}).on('error',function (e) {
response.end('内部错误，请联系管理员！MSG:' + e);
console.log("error: " + e.message);
})
req.write(postData);
req.end();
})
} else if (pathname.match(fileServerUrlFlag) != null) {
//文件拦截保存到本地
var form = new formidable.IncomingForm(),files = [],fields = [];
form.uploadDir = os.tmpdir();
form.on('field',function (field,value) {
console.log(field,value);
fields.push([field,value]);
}).on('file',file) {
console.log(field,file);
files.push([field,file]);
}).on('end',function () {
//
var clientUrl2 = clientUrl.replace("/" + fileServerUrlFlag,'');
var opt = {
host: netServerhost,method: request.method
}
var body = '';
var req = http.request(opt,function (res) {
res.on('data',function () {
response.write(body);
response.end();
});
}).on('error',function (e) {
response.end('内部错误，请联系管理员！MSG:' + e);
console.log("error: " + e.message);
})
//文件上传
uploadFile(files,fields);
});
form.parse(sreq);
}
else {
var realPath = path.join(webapp,pathname); //这里设置自己的文件名称;
var ext = path.extname(realPath);
ext = ext ? ext.slice(1) : 'unkNown';
fs.exists(realPath,function (exists) {
//console.log("file is exists："+exists+" file path: " + realPath + "");
if (!exists) {
response.writeHead(404,{
'Content-Type': 'text/plain'
});
response.write("This request URL " + pathname + " was not found on this server.");
response.end();
} else {
fs.readFile(realPath,"binary",function (err,file) {
if (err) {
response.writeHead(500,{
'Content-Type': 'text/plain'
});
//response.end(err);
response.end("内部错误，请联系管理员");
} else {
var contentType = config[ext] || "text/plain";
response.writeHead(200,{
'Content-Type': contentType
});
response.write(file,"binary");
response.end();
}
});
}
});
}
});
server.listen(PORT);
console.log("Server runing at port: " + PORT + ".");
config.js，用于配置。
rush:js;">
exports.types = {
"css": "text/css","gif": "image/gif","html": "text/html","htm": "text/html","ico": "image/x-icon","jpeg": "image/jpeg","jpg": "image/jpeg","js": "text/javascript","json": "application/json","pdf": "application/pdf","png": "image/png","svg": "image/svg+xml","swf": "application/x-shockwave-flash","tiff": "image/tiff","txt": "text/plain","wav": "audio/x-wav","wma": "audio/x-ms-wma","wmv": "video/x-ms-wmv","xml": "text/xml"
};
exports.netServerUrlFlag = "NETSERVER";
exports.netServerhost = "";
exports.netServerport = "";
exports.javaServerUrlFlag = "JAVASERVER";
exports.javaServerhost = ""; //转发的地址
exports.javaServerport = "";//转发的端口
exports.fileServerUrlFlag="FileUpload";
exports.webapp = "public";//项目目录
exports.webport = "82"; //项目启动端口
总结
以上所述是小编给大家介绍的Node做中转服务器转发接口。编程之家 jb51.cc 收集整理的教程希望能对你有所帮助，如果觉得编程之家不错，可分享给好友！感谢支持。
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