v-if的作用—根據表示式的布林值切換元素的顯示與隱藏（操作dom）
阿新 • • 發佈：2020-12-28
使用物件封裝http請求的結果
public class HttpClientResult implements Serializable { private static final long serialVersionUID = 2168152194164783950L; /** * 響應狀態碼 */ private int code; /** * 響應資料 */ private String content; public HttpClientResult() { } public HttpClientResult(int code) { this.code = code; } public HttpClientResult(String content) { this.content = content; } public HttpClientResult(int code, String content) { this.code = code; this.content = content; } public int getCode() { return code; } public void setCode(int code) { this.code = code; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } @Override public String toString() { return "HttpClientResult [code=" + code + ", content=" + content + "]"; } }
編寫工具類
public class HttpClientUtils { // 編碼格式。傳送編碼格式統一用UTF-8 private static final String ENCODING = "UTF-8"; // 設定連線超時時間，單位毫秒。 private static final int CONNECT_TIMEOUT = 6000; // 請求獲取資料的超時時間(即響應時間)，單位毫秒。 private static final int SOCKET_TIMEOUT = 6000; /** * 傳送get請求；不帶請求頭和請求引數 * * @param url 請求地址 * @return * @throws Exception */ public static HttpClientResult doGet(String url) throws Exception { return doGet(url, null, null); } /** * 傳送get請求；帶請求引數 * * @param url 請求地址 * @param params 請求引數集合 * @return * @throws Exception */ public static HttpClientResult doGet(String url, Map<String, String> params) throws Exception { return doGet(url, null, params); } /** * 傳送get請求；帶請求頭和請求引數 * * @param url 請求地址 * @param headers 請求頭集合 * @param params 請求引數集合 * @return * @throws Exception */ public static HttpClientResult doGet(String url, Map<String, String> headers, Map<String, String> params) throws Exception { // 建立httpClient物件 CloseableHttpClient httpClient = HttpClients.createDefault(); // 建立訪問的地址 URIBuilder uriBuilder = new URIBuilder(url); if (params != null) { Set<Entry<String, String>> entrySet = params.entrySet(); for (Entry<String, String> entry : entrySet) { uriBuilder.setParameter(entry.getKey(), entry.getValue()); } } // 建立http物件 HttpGet httpGet = new HttpGet(uriBuilder.build()); /** * setConnectTimeout：設定連線超時時間，單位毫秒。 * setConnectionRequestTimeout：設定從connect Manager(連線池)獲取Connection * 超時時間，單位毫秒。這個屬性是新加的屬性，因為目前版本是可以共享連線池的。 * setSocketTimeout：請求獲取資料的超時時間(即響應時間)，單位毫秒。 如果訪問一個介面，多少時間內無法返回資料，就直接放棄此次呼叫。 */ RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build(); httpGet.setConfig(requestConfig); // 設定請求頭 packageHeader(headers, httpGet); // 建立httpResponse物件 CloseableHttpResponse httpResponse = null; try { // 執行請求並獲得響應結果 return getHttpClientResult(httpResponse, httpClient, httpGet); } finally { // 釋放資源 release(httpResponse, httpClient); } } /** * 傳送post請求；不帶請求頭和請求引數 * * @param url 請求地址 * @return * @throws Exception */ public static HttpClientResult doPost(String url) throws Exception { return doPost(url, null, null); } /** * 傳送post請求；帶請求引數 * * @param url 請求地址 * @param params 引數集合 * @return * @throws Exception */ public static HttpClientResult doPost(String url, Map<String, String> params) throws Exception { return doPost(url, null, params); } /** * 傳送post請求；帶請求頭和請求引數 * * @param url 請求地址 * @param headers 請求頭集合 * @param params 請求引數集合 * @return * @throws Exception */ public static HttpClientResult doPost(String url, Map<String, String> headers, Map<String, String> params) throws Exception { // 建立httpClient物件 CloseableHttpClient httpClient = HttpClients.createDefault(); // 建立http物件 HttpPost httpPost = new HttpPost(url); /** * setConnectTimeout：設定連線超時時間，單位毫秒。 * setConnectionRequestTimeout：設定從connect Manager(連線池)獲取Connection * 超時時間，單位毫秒。這個屬性是新加的屬性，因為目前版本是可以共享連線池的。 * setSocketTimeout：請求獲取資料的超時時間(即響應時間)，單位毫秒。 如果訪問一個介面，多少時間內無法返回資料，就直接放棄此次呼叫。 */ RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build(); httpPost.setConfig(requestConfig); // 設定請求頭 /*httpPost.setHeader("Cookie", ""); httpPost.setHeader("Connection", "keep-alive"); httpPost.setHeader("Accept", "application/json"); httpPost.setHeader("Accept-Language", "zh-CN,zh;q=0.9"); httpPost.setHeader("Accept-Encoding", "gzip, deflate, br"); httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36");*/ packageHeader(headers, httpPost); // 封裝請求引數 packageParam(params, httpPost); // 建立httpResponse物件 CloseableHttpResponse httpResponse = null; try { // 執行請求並獲得響應結果 return getHttpClientResult(httpResponse, httpClient, httpPost); } finally { // 釋放資源 release(httpResponse, httpClient); } } /** * 傳送put請求；不帶請求引數 * * @param url 請求地址 * @return * @throws Exception */ public static HttpClientResult doPut(String url) throws Exception { return doPut(url); } /** * 傳送put請求；帶請求引數 * * @param url 請求地址 * @param params 引數集合 * @return * @throws Exception */ public static HttpClientResult doPut(String url, Map<String, String> params) throws Exception { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpPut httpPut = new HttpPut(url); RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build(); httpPut.setConfig(requestConfig); packageParam(params, httpPut); CloseableHttpResponse httpResponse = null; try { return getHttpClientResult(httpResponse, httpClient, httpPut); } finally { release(httpResponse, httpClient); } } /** * 傳送delete請求；不帶請求引數 * * @param url 請求地址 * @return * @throws Exception */ public static HttpClientResult doDelete(String url) throws Exception { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpDelete httpDelete = new HttpDelete(url); RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build(); httpDelete.setConfig(requestConfig); CloseableHttpResponse httpResponse = null; try { return getHttpClientResult(httpResponse, httpClient, httpDelete); } finally { release(httpResponse, httpClient); } } /** * 傳送delete請求；帶請求引數 * * @param url 請求地址 * @param params 引數集合 * @return * @throws Exception */ public static HttpClientResult doDelete(String url, Map<String, String> params) throws Exception { if (params == null) { params = new HashMap<String, String>(); } params.put("_method", "delete"); return doPost(url, params); } /** * 傳送上傳檔案請求； * * @param url 請求地址 * @param params 引數集合 * @param headers 請求頭集合 * @param filePath 檔案路徑 * @param fileType 檔案型別名 * @return * @throws Exception */ public static HttpClientResult uploadFile(String url, Map<String, String> params, Map<String, String> headers, String filePath, String fileType) throws Exception { final CloseableHttpClient httpClient = HttpClients.createDefault(); final HttpPost httpPost = new HttpPost(url); httpPost.setHeader("Content-Type", "multipart/form-data"); packageHeader(headers, httpPost); //建立multipart/form-data的entity的builder final MultipartEntityBuilder builder = MultipartEntityBuilder.create(); //將檔案加在http的post請求中 final File file = new File(filePath); builder.addBinaryBody( fileType, new FileInputStream(file), ContentType.APPLICATION_OCTET_STREAM, file.getName() ); if (params != null) { final JSONObject jsonObject = new JSONObject(); for (Map.Entry<String, String> entry : params.entrySet()) { jsonObject.put(entry.getKey(), entry.getValue()); } builder.addTextBody(jsonObject.toString(), ContentType.APPLICATION_JSON.toString()); } //生成multipart/form-data的entity final HttpEntity multipartEntity = builder.build(); httpPost.setEntity(multipartEntity); CloseableHttpResponse response = null; try { return getHttpClientResult(response, httpClient, httpPost); }finally { release(response,httpClient); } } /** * Description: 封裝請求頭 * * @param params * @param httpMethod */ public static void packageHeader(Map<String, String> params, HttpRequestBase httpMethod) { // 封裝請求頭 if (params != null) { Set<Entry<String, String>> entrySet = params.entrySet(); for (Entry<String, String> entry : entrySet) { // 設定到請求頭到HttpRequestBase物件中 httpMethod.setHeader(entry.getKey(), entry.getValue()); } } } /** * Description: 封裝請求引數 * * @param params * @param httpMethod * @throws UnsupportedEncodingException */ public static void packageParam(Map<String, String> params, HttpEntityEnclosingRequestBase httpMethod) throws UnsupportedEncodingException { // 封裝請求引數 if (params != null) { List<NameValuePair> nvps = new ArrayList<NameValuePair>(); Set<Entry<String, String>> entrySet = params.entrySet(); for (Entry<String, String> entry : entrySet) { nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } // 設定到請求的http物件中 httpMethod.setEntity(new UrlEncodedFormEntity(nvps, ENCODING)); } } /** * Description: 獲得響應結果 * * @param httpResponse * @param httpClient * @param httpMethod * @return * @throws Exception */ public static HttpClientResult getHttpClientResult(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception { // 執行請求 httpResponse = httpClient.execute(httpMethod); // 獲取返回結果 if (httpResponse != null && httpResponse.getStatusLine() != null) { String content = ""; if (httpResponse.getEntity() != null) { content = EntityUtils.toString(httpResponse.getEntity(), ENCODING); } return new HttpClientResult(httpResponse.getStatusLine().getStatusCode(), content); } return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR); } /** * Description: 釋放資源 * * @param httpResponse * @param httpClient * @throws IOException */ public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException { // 釋放資源 if (httpResponse != null) { httpResponse.close(); } if (httpClient != null) { httpClient.close(); } } }