如何使用SAP云平台 + JNDI访问Internet Service，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
以Internet Service http://maps.googleapis.com/maps/api/distancematrix/xml?origins=Walldorf&destinations=Berlin为例，
在浏览器里访问这个url，得到输出：从Walldorf到Berlin的距离。
如何让一个部署到SAP云平台的Java应用也能访问到该internet service呢？
首先在SAP云平台里创建一个destination，维护service的end point：
在Java代码里使用SAP云平台里创建的destination：
然后使用JNDI service读取destination里配置的url：
部署到SAP云平台之后，在Eclipse里看到preview结果：
SAP云平台Cockpit显示如下：
浏览器访问如下：
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <!-- Main sample servlet mapped to / so that the integration test harness can detect readiness (generic for all samples) --> <servlet> <servlet-name>ConnectivityServlet</servlet-name> <servlet-class>com.sap.cloud.sample.connectivity.ConnectivityServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ConnectivityServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- Declare the JNDI lookup of destination --> <resource-ref> <res-ref-name>connectivityConfiguration</res-ref-name> <res-type>com.sap.core.connectivity.api.configuration.ConnectivityConfiguration</res-type> </resource-ref> </web-app>package com.sap.cloud.sample.connectivity; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.InetSocketAddress; import java.net.Proxy; import java.net.URL; import javax.annotation.Resource; import javax.naming.Context; import javax.naming.InitialContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.sap.cloud.account.TenantContext; import com.sap.core.connectivity.api.configuration.ConnectivityConfiguration; import com.sap.core.connectivity.api.configuration.DestinationConfiguration; public class ConnectivityServlet extends HttpServlet { @Resource private TenantContext tenantContext; private static final long serialVersionUID = 1L; private static final int COPY_CONTENT_BUFFER_SIZE = 1024; private static final Logger LOGGER = LoggerFactory.getLogger(ConnectivityServlet.class); private static final String ON_PREMISE_PROXY = "OnPremise"; @Override public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpURLConnection urlConnection = null; String destinationName = request.getParameter("destname"); if (destinationName == null) { destinationName = "google_map"; } try { Context ctx = new InitialContext(); ConnectivityConfiguration configuration = (ConnectivityConfiguration) ctx.lookup("java:comp/env/connectivityConfiguration"); DestinationConfiguration destConfiguration = configuration.getConfiguration(destinationName); if (destConfiguration == null) { response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, String.format("Destination %s is not found. Hint:" + " Make sure to have the destination configured.", destinationName)); return; } String value = destConfiguration.getProperty("URL"); URL url = new URL(value + "xml?origins=Walldorf&destinations=Paris"); String proxyType = destConfiguration.getProperty("ProxyType"); Proxy proxy = getProxy(proxyType); urlConnection = (HttpURLConnection) url.openConnection(proxy); injectHeader(urlConnection, proxyType); InputStream instream = urlConnection.getInputStream(); OutputStream outstream = response.getOutputStream(); copyStream(instream, outstream); } catch (Exception e) { String errorMessage = "Connectivity operation failed with reason: " + e.getMessage() + ". See " + "logs for details. Hint: Make sure to have an HTTP proxy configured in your " + "local environment in case your environment uses " + "an HTTP proxy for the outbound Internet " + "communication."; LOGGER.error("Connectivity operation failed", e); response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, errorMessage); } } private Proxy getProxy(String proxyType) { Proxy proxy = Proxy.NO_PROXY; String proxyHost = null; String proxyPort = null; if (ON_PREMISE_PROXY.equals(proxyType)) { // Get proxy for on-premise destinations proxyHost = System.getenv("HC_OP_HTTP_PROXY_HOST"); proxyPort = System.getenv("HC_OP_HTTP_PROXY_PORT"); } else { // Get proxy for internet destinations proxyHost = System.getProperty("https.proxyHost"); proxyPort = System.getProperty("https.proxyPort"); } if (proxyPort != null && proxyHost != null) { int proxyPortNumber = Integer.parseInt(proxyPort); proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPortNumber)); } return proxy; } private void injectHeader(HttpURLConnection urlConnection, String proxyType) { if (ON_PREMISE_PROXY.equals(proxyType)) { // Insert header for on-premise connectivity with the consumer account name urlConnection.setRequestProperty("SAP-Connectivity-ConsumerAccount", tenantContext.getTenant().getAccount().getId()); } } private void copyStream(InputStream inStream, OutputStream outStream) throws IOException { byte[] buffer = new byte[COPY_CONTENT_BUFFER_SIZE]; int len; while ((len = inStream.read(buffer)) != -1) { outStream.write(buffer, 0, len); } }}关于如何使用SAP云平台 + JNDI访问Internet Service问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注编程网行业资讯频道了解更多相关知识。
