okHttp实例判断一下网址打不开的方法
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source="https%3A%2F%2Fwww.yuque.com%2Faiwork%2Fnba2pr%2Fprq7w34hklervx9c"></ne-clipboard><div class="lake-content" typography="classic"><h3 id="43d7475e" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">. 创建HTTP客户端实例</span></h3><pre data-language="javascript" id="BdHLD" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>var http = new okHttp();http.setHeader("User-Agent", "Mozilla/5.0");</code></pre><p id="u530bcb17" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="uc887b916" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">new okHttp()</span></code><span class="ne-text"><br></span><span class="ne-text">创建一个HTTP客户端对象，用于发送网络请求（类似浏览器）。</span></li><li id="u42a290d6" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">setHeader("User-Agent", "Mozilla/5.0")</span></code><span class="ne-text"><br></span><span class="ne-text">设置请求头，模拟浏览器访问（避免被服务器拒绝）。</span></li></ul><hr id="ROcHh" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="f44fd5ff" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">2. 定义请求URL</span></h3><pre data-language="javascript" id="lu0vN" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>var url = "http://www.baidu.com/";</code></pre><p id="ua61c64d2" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="uf620238b" data-lake-index-type="0"><span class="ne-text">目标地址是百度首页（可替换为任何HTTP/HTTPS URL）。</span></li></ul><hr id="aJPAt" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="7ba4191e" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">3. 发送GET请求（核心逻辑）</span></h3><pre data-language="javascript" id="OI0nw" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>try {
printl("开始发送 GET 请求到: " + url);
var result = http.get(url);</code></pre><p id="ue88ed310" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="uc96becf0" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">try-catch</span></code><span class="ne-text"><br></span><span class="ne-text">捕获请求过程中可能出现的异常（如网络错误、超时等）。</span></li><li id="u7a55bdac" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">http.get(url)</span></code><span class="ne-text"><br></span><span class="ne-text">发送GET请求，返回结果存储在</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">result</span></code><span class="ne-text"> </span><span class="ne-text">变量中。</span></li></ul><hr id="happd" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="391ee9fa" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">4. 打印完整响应对象</span></h3><pre data-language="javascript" id="mik6L" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>printl("请求完成，响应对象: " + JSON.stringify(result));</code></pre><p id="u118b987c" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="u2f8cd64f" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">JSON.stringify(result)</span></code><span class="ne-text"><br></span><span class="ne-text">将响应对象转为字符串，方便打印日志（调试用）。</span></li></ul><hr id="KPk3l" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="3ead02d9" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">5. 检查响应状态</span></h3><pre data-language="javascript" id="ClU6k" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>if (result && result.code !== undefined) {
printl("请求成功，状态码: " + result.code);</code></pre><p id="u0bc67ea6" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="u1c0f8217" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">result.code</span></code><span class="ne-text"><br></span><span class="ne-text">假设响应对象包含</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">code</span></code><span class="ne-text"> </span><span class="ne-text">字段（HTTP状态码，如200表示成功）。</span></li><li id="u069b7c58" data-lake-index-type="0"><span class="ne-text">如果状态码存在，认为请求成功。</span></li></ul><hr id="UdwjR" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="c7a2bce8" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">6. 处理响应内容</span></h3><pre data-language="javascript" id="IqfOb" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>if (result.body !== undefined) {
printl("响应内容: " + result.body.substring(0, 100) + "...");
} else {
printl("响应内容为空");
}</code></pre><p id="u46fb3f09" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="u54d69110" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">result.body</span></code><span class="ne-text"><br></span><span class="ne-text">假设响应对象包含</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">body</span></code><span class="ne-text"> </span><span class="ne-text">字段（服务器返回的HTML/JSON数据）。</span></li><li id="ud0e14335" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">substring(0, 100)</span></code><span class="ne-text"><br></span><span class="ne-text">只打印前100字符（避免日志过长）。</span></li></ul><hr id="z5giJ" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="647a13da" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">7. 处理异常响应</span></h3><pre data-language="javascript" id="spWPp" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>} else {
printl("请求失败，响应对象异常: " + JSON.stringify(result));
}</code></pre><p id="u8bf471e6" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="u2a8a9034" data-lake-index-type="0"><span class="ne-text">如果</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">result</span></code><span class="ne-text"> </span><span class="ne-text">为空或没有</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">code</span></code><span class="ne-text"> </span><span class="ne-text">字段，认为请求失败。</span></li></ul><hr id="eVOU2" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="0d8dae63" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">8. 捕获并打印错误</span></h3><pre data-language="javascript" id="ikqdm" class="ne-codeblock language-javascript" style="border: 1px solid #e8e8e8; border-radius: 2px; background: #f9f9f9; padding: 16px; font-size: 13px; color: #595959"><code>} catch (e) {
printl("请求失败: " + e.message);
if (e.errorDescription) {
printl("错误描述: " + e.errorDescription);
}
}</code></pre><p id="u1341be3b" class="ne-p" style="min-height: 24px;"><br></p><ul class="ne-ul" style="padding-left: 23px;"><li id="uf83b762e" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">e.message</span></code><span class="ne-text"><br></span><span class="ne-text">打印错误基本信息（如超时、DNS解析失败）。</span></li><li id="uffbe9bd4" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">e.errorDescription</span></code><span class="ne-text"><br></span><span class="ne-text">打印额外错误详情（如果有）。</span></li></ul><hr id="UZEVN" class="ne-hr" style="background-color: rgb(232, 232, 232); border-style: solid; border-color: transparent; border-image: initial; margin-top: 18px; margin-bottom: 18px;"><h3 id="86eb7211" style="line-height: 28px; margin-top: 16px; margin-bottom: 5px;"><span class="ne-text">关键点总结</span></h3><ol class="ne-ol" style="padding-left: 23px;"><li id="u6551e99e" data-lake-index-type="0"><span class="ne-text">流程顺序</span><span class="ne-text"><br></span><span class="ne-text">创建客户端 → 设置请求头 → 发送请求 → 检查响应 → 处理结果/错误。</span></li><li id="u53ae15a8" data-lake-index-type="0"><span class="ne-text">假设条件</span></li></ol><ul class="ne-list-wrap" style="padding-left: 23px; list-style: none;"><ul ne-level="1" class="ne-ul" style="padding-left: 23px; list-style-position: initial; list-style-image: initial;"><li id="u3c037706" data-lake-index-type="0"><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">okHttp</span></code><span class="ne-text"> </span><span class="ne-text">返回的对象格式为</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">{ code: 200, body: "..." }</span></code><span class="ne-text">。</span></li><li id="u6771add6" data-lake-index-type="0"><span class="ne-text">如果响应不符合此格式，会进入</span><span class="ne-text"> </span><code class="ne-code" style="font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; background-color: rgba(0, 0, 0, 0.06); border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 2px; padding-right: 2px; padding-left: 2px;"><span class="ne-text">else</span></code><span class="ne-text"> </span><span class="ne-text">分支（"响应对象异常"）。</span></li></ul></ul><ol start="3" class="ne-ol" style="padding-left: 23px;"><li id="ubae709e4" data-lake-index-type="0"><span class="ne-text">常见错误</span></li></ol><ul class="ne-list-wrap" style="padding-left: 23px; list-style: none;"><ul ne-level="1" class="ne-ul" style="padding-left: 23px; list-style-position: initial; list-style-image: initial;"><li id="u21a00f54" data-lake-index-type="0"><span class="ne-text">DNS解析失败</span><span class="ne-text">：域名无法访问（如拼写错误）。</span></li><li id="u821efe9e" data-lake-index-type="0"><span class="ne-text">空响应</span><span class="ne-text">：服务器未返回数据或网络中断。</span></li><li id="u830ae10e" data-lake-index-type="0"><span class="ne-text">状态码异常：如404（页面不存在）、500（服务器错误）。</span></li></ul></ul><div><div class="blockcode"><blockquote>// 创建 okHttp 实例<br>var http = new okHttp();<br>http.setHeader("User-Agent", "Mozilla/5.0");<br>var url = "http://www.baidu.com/";<br><br>try {<br> printl("开始发送 GET 请求到: " + url);<br> var result = http.get(url);<br> printl("请求完成，响应对象: " + JSON.stringify(result)); // 打印完整的响应对象<br><br> if (result && result.code !== undefined) {<br> printl("请求成功，状态码: " + result.code);<br> if (result.body !== undefined) {<br> printl("响应内容: " + result.body.substring(0, 100) + "...");<br> } else {<br> printl("响应内容为空");<br> }<br> } else {<br> printl("请求失败，响应对象异常: " + JSON.stringify(result));<br> }<br>} catch (e) {<br> printl("请求失败: " + e.message);<br> if (e.errorDescription) {<br> printl("错误描述: " + e.errorDescription);<br> }<br>}<br></blockquote></div></div></div><p></p>
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