NodeJS跨域问题解决

前后端分离,本地前端开发调用接口会有跨域问题,一般有以下3种解决方法:

  1. 后端接口打包到本地运行(缺点:每次后端更新都要去服务器下一个更新包,还要在本地搭建java运行环境,麻烦);
  2. CORS跨域:后端接口在返回的时候,在header中加入’Access-Control-Allow-origin’:* 之类;
  3. 用nodejs搭建本地http服务器,并且判断访问接口URL时进行转发,完美解决本地开发时候的跨域问题。
  4. nodejs搭建本地http服务器
  5. 应用node-http-proxy,做接口url的转发

    具体方法:

  6. node.js搭建本地http服务器
  7. node.js做转发使用node-http-proxy实现,官方文档:https://github.com/nodejitsu/node-http-proxy#using-https

项目准备

  1. npm初始化

    1
    npm init
  2. 安装node-http-proxy模块

    1
    npm install http-proxy --save-dev
  3. 项目结构

下面的例子中,我们把html文件直接放在根目录’./‘,也可以指定一个网站目录,在proxy.js中可以自定义
配置HTTP服务器和PROXY转发

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
var PORT = 3000;
var http = require('http');
var url=require('url');
var fs=require('fs');
var mine=require('./mine').types;
var path=require('path');
var httpProxy = require('http-proxy');
var proxy = httpProxy.createProxyServer({
target: 'http://192.168.10.38:8180/', //接口地址
// 下面的设置用于https
// ssl: {
// key: fs.readFileSync('server_decrypt.key', 'utf8'),
// cert: fs.readFileSync('server.crt', 'utf8')
// },
// secure: false
});
proxy.on('error', function(err, req, res){
res.writeHead(500, {
'content-type': 'text/plain'
});
console.log(err);
res.end('Something went wrong. And we are reporting a custom error message.');
});
var server = http.createServer(function (request, response) {
var pathname = url.parse(request.url).pathname;
//var realPath = path.join("main-pages", pathname); // 指定根目录
var realPath = path.join("./", pathname);
console.log(pathname);
console.log(realPath);
var ext = path.extname(realPath);
ext = ext ? ext.slice(1) : 'unknown';
//判断如果是接口访问,则通过proxy转发
if(pathname.indexOf("mspj-mall-admin") > 0){
proxy.web(request, response);
return;
}
fs.exists(realPath, function (exists) {
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);
} else {
var contentType = mine[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 + ".");

MINE.JS

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
exports.types = {
"css": "text/css",
"gif": "image/gif",
"html": "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",
"woff": "application/x-woff",
"woff2": "application/x-woff2",
"tff": "application/x-font-truetype",
"otf": "application/x-font-opentype",
"eot": "application/vnd.ms-fontobject"
};

然后把项目中的接口地址改成http://localhost:3000/……
启动nodejs服务
启动cmd,定位到项目目录,运行

1
node proxy.js

访问:
http://localhost:3000/
可以看到项目中调用的http://localhost:3000/….. 都会从http://192.168.10.38:8180/…… 获取数据,然后转发到本地。
这样就不存在跨域了。