HarmonyOS 鸿蒙Next udp socket 发送数据 "code":2301013,"message":"Permission denied"

自己回复一下：

目前，经测试，使用localhost会提示拒绝访问，但改用127.0.0.1访问便能成功。
模拟局域网环境测试发现，UDP客户端的监听地址必需是：0.0.0.0
个人感觉，此处有问题。

import socket from '@ohos.net.socket'
import util from '@ohos.util';
const TAG: string = ‘UdpPage’
@Entry
@Component
struct UdpPage {
@State msg: string = ‘’;
@State serverHost: string = ‘127.0.0.1’;
@State serverPort: number = 12345;
build() {
Row() {
Column() {
TextInput({ placeholder: ‘请输入服务端IP’, text: this.serverHost })
.onChange((value) => {
this.serverHost = value;
})
TextInput({ placeholder: ‘请输入服务端Port’, text: ‘’ + this.serverPort })
.onChange((value) => {
this.serverPort = parseInt(value);
})
Text(‘启动服务端’)
.fontSize(30)
.backgroundColor(Color.Red)
.width(‘80%’)
.fontWeight(FontWeight.Bold)
.onClick(() => {
let udp = socket.constructUDPSocketInstance();
udp.bind({ address: ‘127.0.0.1’, port: 12345 }, err => {
if (err) {
console.error(${TAG} server bind fail: ${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(err)});
}
console.info(${TAG} server bind success);
})
udp.on(‘message’, value => {
let dataView = new DataView(value.message);
let str = ‘’;
for(let i = 0 ; i < dataView.byteLength ; i++){
str += String.fromCharCode(dataView.getUint8(i));
}
this.msg = str;
console.log(${TAG} server message: ${value.message}, remoteInfo: ${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(value.remoteInfo)});
})
})
Text(‘启动客户端’)
.fontSize(30)
.width(‘80%’)
.margin({ top: 50 })
.fontWeight(FontWeight.Bold)
.onClick(() => {
let udp = socket.constructUDPSocketInstance();
udp.bind({ address: ‘0.0.0.0’ })
        <span class="hljs-keyword"><span class="hljs-keyword">let</span></span> textEncoder = <span class="hljs-keyword"><span class="hljs-keyword">new</span></span> util.TextEncoder();
        <span class="hljs-keyword"><span class="hljs-keyword">const</span></span> arrayBuffer = textEncoder.encodeInto(<span class="hljs-string"><span class="hljs-string">'Hello ArkSocket'</span></span>).buffer;
        <span class="hljs-keyword"><span class="hljs-keyword">let</span></span> send = udp.send({
          data: arrayBuffer,
          address: {
            address: <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.serverHost,
            port: <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.serverPort
          }
        })

        send.then(() =&gt; {
          <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.msg = <span class="hljs-string"><span class="hljs-string">''</span></span>;
          console.log(`${TAG} client send success`);
        }).catch(err =&gt; {
          console.error(`${TAG} client send fail: ${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(err)}`)
        })

        udp.on(<span class="hljs-string"><span class="hljs-string">'message'</span></span>, value =&gt; {
          <span class="hljs-keyword"><span class="hljs-keyword">let</span></span> dataView = <span class="hljs-keyword"><span class="hljs-keyword">new</span></span> <span class="hljs-built_in"><span class="hljs-built_in">DataView</span></span>(value.message);
          <span class="hljs-keyword"><span class="hljs-keyword">let</span></span> str = <span class="hljs-string"><span class="hljs-string">''</span></span>;
          <span class="hljs-keyword"><span class="hljs-keyword">for</span></span>(<span class="hljs-keyword"><span class="hljs-keyword">let</span></span> i = <span class="hljs-number"><span class="hljs-number">0</span></span> ; i &lt; dataView.byteLength ; i++){
            str += <span class="hljs-built_in"><span class="hljs-built_in">String</span></span>.fromCharCode(dataView.getUint8(i));
          }
          <span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.msg = str;
          console.log(`${TAG} client message: ${str}, remoteInfo: ${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(value.remoteInfo)}`);
        })
        udp.on(<span class="hljs-string"><span class="hljs-string">'error'</span></span>, value =&gt; {
          console.error(`${TAG}, udp have en error, ${<span class="hljs-built_in"><span class="hljs-built_in">JSON</span></span>.stringify(value)}`)
        })
      })
    Text(<span class="hljs-keyword"><span class="hljs-keyword">this</span></span>.msg)
  }
  .width(<span class="hljs-string"><span class="hljs-string">'100%'</span></span>)
}
.height(<span class="hljs-string"><span class="hljs-string">'100%'</span></span>)
}
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

暂时先这样