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| 1 | +# UDP协议 |
| 2 | + |
| 3 | +UDP虽然传递数据不可靠,无连接,但是有传递速度快的特点,在传送音频、影视、图片时,少点数据无伤大雅,可以考虑用UDP。 |
| 4 | + |
| 5 | +# dgram模块 |
| 6 | + |
| 7 | +Node中`UDP`对应的模块是`dgram`,通过下面的方式引用`UDP`模块并创建`UDP`应用实例: |
| 8 | +```js |
| 9 | +var dgram = require('dgram'); |
| 10 | +var udp = dgram.createSocket('udp4'); |
| 11 | +``` |
| 12 | + |
| 13 | +## 客户端 |
| 14 | + |
| 15 | +```js |
| 16 | +const dgram = require('dgram'); |
| 17 | +const client = dgram.createSocket('udp4'); |
| 18 | + |
| 19 | +client.on('close', () => { |
| 20 | + console.log('socket已关闭'); |
| 21 | +}); |
| 22 | + |
| 23 | +client.on('error', (err) => { |
| 24 | + console.log(err); |
| 25 | +}); |
| 26 | +client.on('message', (msg, rinfo) => { |
| 27 | + if (msg == 'exit') client.close(); |
| 28 | + console.log(`receive message from ${rinfo.address}:${rinfo.port}`); |
| 29 | +}); |
| 30 | +client.send(`hello`, 8060, 'localhost'); |
| 31 | +``` |
| 32 | + |
| 33 | +## 服务端 |
| 34 | + |
| 35 | +```js |
| 36 | +const dgram = require('dgram'); |
| 37 | +const server = dgram.createSocket('udp4'); |
| 38 | + |
| 39 | +server.on('close', () => { |
| 40 | + console.log('socket已关闭'); |
| 41 | +}); |
| 42 | + |
| 43 | +server.on('error', (err) => { |
| 44 | + console.log(err); |
| 45 | +}); |
| 46 | + |
| 47 | +server.on('listening', () => { |
| 48 | + console.log('socket正在监听中...'); |
| 49 | +}); |
| 50 | + |
| 51 | +server.on('message', (msg, rinfo) => { |
| 52 | + console.log(`receive message from ${rinfo.address}:${rinfo.port}`); |
| 53 | + server.send('exit', rinfo.port, rinfo.address) |
| 54 | +}); |
| 55 | + |
| 56 | +server.bind('8060'); |
| 57 | +``` |
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