在Java程序中调用Salesforce REST API

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Salesforce 提供多种不同的REST API接口以支持客户应用的开发，本文介绍如何在Java程序中使用Apache HttpComponents调用Salesforce REST API。

第一步：登录Salesforce

首先设置包括Salesforce登录主机和登录接口URL，并初始化一个Post请求。

HttpHost target = new HttpHost("login.salesforce.com", 443, "https");String loginURL= "/services/Soap/u/29.0";HttpPost loginPost = new HttpPost(loginURL);

然后设置Post头信息

loginPost.setHeader("content-type", "text/xml"); loginPost.setHeader("charset", "UTF-8"); loginPost.setHeader("SOAPAction", "login");

其后发送一个Post登录请求并接受其响应。

String loginRequestXMLTemplate = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n" + "<env:Envelope\n" +"xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"\n" + "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n" + "xmlns:env=\"http://schemas.xmlsoap.org/soap/envelope/\">\n" + "<env:Body>\n" + "   <n1:login xmlns:n1=\"urn:partner.soap.sforce.com\">\n" +"       <n1:username>%s</n1:username>\n" + "       <n1:password>%s%s</n1:password>\n" + "</n1:login>\n" + "</env:Body>\n" + "</env:Envelope>\n";String loginRequestXML = String.format(loginRequestXMLTemplate, _username, _password, _securityToken);System.out.println("Request...");System.out.println(loginRequestXML);StringEntity input = new StringEntity(loginRequestXML);loginPost.setEntity(input);CloseableHttpResponse loginResponse = httpClient.execute(target, loginPost);HttpEntity entity = loginResponse.getEntity();String response = EntityUtils.toString(entity);EntityUtils.consume(loginResponse.getEntity());loginResponse.close();

获取登录响应之后将其转换为XML结构，并读取sessionId和serverUrl

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();Document document = builder.parse(new InputSource(new StringReader(response)));Node node = document.getElementsByTagName("sessionId").item(0);sessionId = node.getFirstChild().getTextContent();node = document.getElementsByTagName("serverUrl").item(0);String serverUrlString = node.getFirstChild().getTextContent();serverURL = new URL (serverUrlString);

第二步：调用List Report REST API

首先设置REST AP接口主机和 List Report REST AP接口URL，并初始化一个Get请求。

target = new HttpHost(serverURL.getHost(), 443, "https");String listReportURL= "/services/data/v29.0/analytics/reports/";HttpGet reportListGet = new HttpGet(listReportURL);

然后设置Get头信息

reportListGet.setHeader("Authorization", "Bearer " + sessionId);

其后发送Get请求并接受其响应

CloseableHttpResponse reportListResponse = httpClient.execute(target, reportListGet); entity = reportListResponse.getEntity(); response = EntityUtils.toString(entity);

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