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小編給大家分享一下React中如何使用axios發送請求,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
在React項目中使用axios請求,首先需要安裝axios:
npm install axios --save
然后在react文件中使用typescript方式導入axios依賴:
import axios from 'axios';
axios中使用GET請求時有兩中方式:
一種是使用axios.get的方式進行
一種是使用axios(config { ... })的方式進行
使用封裝的axios.get進行請求的常用格式如下:
// Make a request for a user with a given ID axios.get('/getUser?id=12345') .then(function (response) { // handle success console.log(response); // update state or do something this.setState({ // ... }) }) .catch(function (error) { // handle error console.log(error); }) .then(function () { // always executed }); // Optionally the request above could also be done as axios.get('/getUser', { params: { // 這里的參數設置為URL參數(根據URL攜帶參數) id: 12345 } }) .then(function (response) { console.log(response); }) .catch(function (error) { console.log(error); }) .then(function () { // always executed }); // Want to use async/await? Add the `async` keyword to your outer function/method. async function getUser() { try { const response = await axios.get('/getUser?id=12345'); console.log(response); } catch (error) { console.error(error); } }
使用axios(config {...}) 的方式發送GET請求格式如下:
axios({ method: 'get', url: '/getUser', params: { id: 12345, } }) .then(function (response) { console.log(response); });
以上的get請求發送的URL均為如下:
http:HOST_IP:XXXX/getUser?id=12345
同GET請求一樣,使用POST也有兩種請求方式。
axios.post('/createUser', { firstName: 'Fred', lastName: 'Flintstone' }) .then(function (response) { console.log(response); }) .catch(function (error) { console.log(error); });
// Send a POST request axios({ method: 'post', url: '/createUser', data: { // 這里data中的參數為requestBody參數,服務端需要使用@RequestBody注解進行獲取 firstName: 'Fred', lastName: 'Flintstone' } }).then(function (response) { console.log(response); }).catch(function (error) { console.log(error); });
需要注意的是,在使用axios(config {})方式進行GET或POST請求發送時,GET請求中params為URL參數,POST請求中data為RequestBody參數,在服務端需要使用@RequestBody注解接收,Spring Boot能夠自動解析為Java相應的對象。
使用axios也可以一次發送多個請求:
function getUserAccount() { return axios.get('/user/12345'); } function getUserPermissions() { return axios.get('/user/12345/permissions'); } axios.all([getUserAccount(), getUserPermissions()]) .then(axios.spread(function (acct, perms) { // Both requests are now complete }));
在axios的readme文檔中,有對config對象的具體配置說明,如下:
{ // `url` is the server URL that will be used for the request url: '/user', // `method` is the request method to be used when making the request method: 'get', // default // `baseURL` will be prepended to `url` unless `url` is absolute. // It can be convenient to set `baseURL` for an instance of axios to pass relative URLs // to methods of that instance. baseURL: 'https://some-domain.com/api/', // `transformRequest` allows changes to the request data before it is sent to the server // This is only applicable for request methods 'PUT', 'POST', 'PATCH' and 'DELETE' // The last function in the array must return a string or an instance of Buffer, ArrayBuffer, // FormData or Stream // You may modify the headers object. transformRequest: [function (data, headers) { // Do whatever you want to transform the data return data; }], // `transformResponse` allows changes to the response data to be made before // it is passed to then/catch transformResponse: [function (data) { // Do whatever you want to transform the data return data; }], // `headers` are custom headers to be sent headers: {'X-Requested-With': 'XMLHttpRequest'}, // `params` are the URL parameters to be sent with the request // Must be a plain object or a URLSearchParams object params: { ID: 12345 }, // `paramsSerializer` is an optional function in charge of serializing `params` // (e.g. https://www.npmjs.com/package/qs, http://api.jquery.com/jquery.param/) paramsSerializer: function (params) { return Qs.stringify(params, {arrayFormat: 'brackets'}) }, // `data` is the data to be sent as the request body // Only applicable for request methods 'PUT', 'POST', and 'PATCH' // When no `transformRequest` is set, must be of one of the following types: // - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams // - Browser only: FormData, File, Blob // - Node only: Stream, Buffer data: { firstName: 'Fred' }, // syntax alternative to send data into the body // method post // only the value is sent, not the key data: 'Country=Brasil&City=Belo Horizonte', // `timeout` specifies the number of milliseconds before the request times out. // If the request takes longer than `timeout`, the request will be aborted. timeout: 1000, // default is `0` (no timeout) // `withCredentials` indicates whether or not cross-site Access-Control requests // should be made using credentials withCredentials: false, // default // `adapter` allows custom handling of requests which makes testing easier. // Return a promise and supply a valid response (see lib/adapters/README.md). adapter: function (config) { /* ... */ }, // `auth` indicates that HTTP Basic auth should be used, and supplies credentials. // This will set an `Authorization` header, overwriting any existing // `Authorization` custom headers you have set using `headers`. // Please note that only HTTP Basic auth is configurable through this parameter. // For Bearer tokens and such, use `Authorization` custom headers instead. auth: { username: 'janedoe', password: 's00pers3cret' }, // `responseType` indicates the type of data that the server will respond with // options are: 'arraybuffer', 'document', 'json', 'text', 'stream' // browser only: 'blob' responseType: 'json', // default // `responseEncoding` indicates encoding to use for decoding responses // Note: Ignored for `responseType` of 'stream' or client-side requests responseEncoding: 'utf8', // default // `xsrfCookieName` is the name of the cookie to use as a value for xsrf token xsrfCookieName: 'XSRF-TOKEN', // default // `xsrfHeaderName` is the name of the http header that carries the xsrf token value xsrfHeaderName: 'X-XSRF-TOKEN', // default // `onUploadProgress` allows handling of progress events for uploads // browser only onUploadProgress: function (progressEvent) { // Do whatever you want with the native progress event }, // `onDownloadProgress` allows handling of progress events for downloads // browser only onDownloadProgress: function (progressEvent) { // Do whatever you want with the native progress event }, // `maxContentLength` defines the max size of the http response content in bytes allowed maxContentLength: 2000, // `validateStatus` defines whether to resolve or reject the promise for a given // HTTP response status code. If `validateStatus` returns `true` (or is set to `null` // or `undefined`), the promise will be resolved; otherwise, the promise will be // rejected. validateStatus: function (status) { return status >= 200 && status < 300; // default }, // `maxRedirects` defines the maximum number of redirects to follow in node.js. // If set to 0, no redirects will be followed. maxRedirects: 5, // default // `socketPath` defines a UNIX Socket to be used in node.js. // e.g. '/var/run/docker.sock' to send requests to the docker daemon. // Only either `socketPath` or `proxy` can be specified. // If both are specified, `socketPath` is used. socketPath: null, // default // `httpAgent` and `httpsAgent` define a custom agent to be used when performing http // and https requests, respectively, in node.js. This allows options to be added like // `keepAlive` that are not enabled by default. httpAgent: new http.Agent({ keepAlive: true }), httpsAgent: new https.Agent({ keepAlive: true }), // `proxy` defines the hostname and port of the proxy server. // You can also define your proxy using the conventional `http_proxy` and // `https_proxy` environment variables. If you are using environment variables // for your proxy configuration, you can also define a `no_proxy` environment // variable as a comma-separated list of domains that should not be proxied. // Use `false` to disable proxies, ignoring environment variables. // `auth` indicates that HTTP Basic auth should be used to connect to the proxy, and // supplies credentials. // This will set an `Proxy-Authorization` header, overwriting any existing // `Proxy-Authorization` custom headers you have set using `headers`. proxy: { host: '127.0.0.1', port: 9000, auth: { username: 'mikeymike', password: 'rapunz3l' } }, // `cancelToken` specifies a cancel token that can be used to cancel the request // (see Cancellation section below for details) cancelToken: new CancelToken(function (cancel) { }) }
axios在進行請求后得到的response對象格式如下:
{ // `data` is the response that was provided by the server data: {}, // `status` is the HTTP status code from the server response status: 200, // `statusText` is the HTTP status message from the server response statusText: 'OK', // `headers` the HTTP headers that the server responded with // All header names are lower cased and can be accessed using the bracket notation. // Example: `response.headers['content-type']` headers: {}, // `config` is the config that was provided to `axios` for the request config: {}, // `request` is the request that generated this response // It is the last ClientRequest instance in node.js (in redirects) // and an XMLHttpRequest instance in the browser request: {} }
當在請求后使用then方法時,可以獲取response對象的各個屬性值,其中data即為服務端返回的相應對象:
axios.get('/user/12345') .then(function (response) { console.log(response.data); console.log(response.status); console.log(response.statusText); console.log(response.headers); console.log(response.config); });
在使用axios時,可以對axios對象進行全局的設置,該設置會應用于axios所在當前javascript類中的所有axios請求中,例如如下的設置:
axios.defaults.baseURL = 'https://api.example.com'; axios.defaults.headers.common['Authorization'] = AUTH_TOKEN; axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';
如果不需對axios進行全局設置,則可以在使用某個axios對象時,進行單一對象的設置,例如如下:
// Set config defaults when creating the instance const instance = axios.create({ baseURL: 'https://api.example.com' }); // Alter defaults after instance has been created instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;
可以使用axios攔截器來在發送請求之前或在響應response之前(then方法)來攔截請求并進行自定義的設置,定義request和response攔截器示例如下:
// Add a request interceptor axios.interceptors.request.use(function (config) { // Do something before request is sent return config; }, function (error) { // Do something with request error return Promise.reject(error); }); // Add a response interceptor axios.interceptors.response.use(function (response) { // Any status code that lie within the range of 2xx cause this function to trigger // Do something with response data return response; }, function (error) { // Any status codes that falls outside the range of 2xx cause this function to trigger // Do something with response error return Promise.reject(error); });
當需要刪除攔截器時,進行如下操作:
const myInterceptor = axios.interceptors.request.use(function () {/*...*/}); axios.interceptors.request.eject(myInterceptor);
也可以將定義的攔截器添加到自定義的axios實例中:
const instance = axios.create(); instance.interceptors.request.use(function () {/*...*/});
以上是“React中如何使用axios發送請求”這篇文章的所有內容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內容對大家有所幫助,如果還想學習更多知識,歡迎關注億速云行業資訊頻道!
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