JAVA调用SAP ODATA服务
作者：互联网
1、(401) 未经授权；
解决方法：将用户名密码加密后，添加到HTTP HEADER中。
String auth = "ZRFC" + ":" + "Init1234";
String encodeAuth = "Basic " + new String(Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8)));
connection.setRequestProperty("Authorization", encodeAuth);
2、POST方法地址；
解决方法：要先用GET方法从去调用ODATA中GET_ENTIY方法，例如：http://vhcals4h.com:44301/sap/opu/odata/sap/ztest_srv/HEADERSet('5000000001')，然后再将返回内容作为表身，传到ENTITYSET地址，如：http://vhcals4h.com:44301/sap/opu/odata/sap/ztest_srv/HEADERSet('5000000001')。
3、CSRF跨域问题；
解决方法：先用GET方法取到TOKEN再放到POST HEADER中。
String csrfToken = connection.getHeaderField("X-CSRF-Token");
connPost.setRequestProperty("X-CSRF-Token", csrfToken);
package odata_test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
public class RestfulAction {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
//添加cookie支持
CookieManager manager = new CookieManager();
//设置cookie策略，只接受与你对话服务器的cookie，而不接收Internet上其它服务器发送的cookie
manager.setCookiePolicy(CookiePolicy.ACCEPT_ORIGINAL_SERVER);
CookieHandler.setDefault(manager);
System.out.println(manager.getCookieStore());
String url = "http://vhcals4h.com:44301/sap/opu/odata/sap/ztest_srv/HEADERSet('5000000001')";
URL serverUrl = new URL(url);
HttpURLConnection connection = (HttpURLConnection) serverUrl.openConnection();
connection.setRequestMethod("GET");
//connection.setRequestProperty("Authorization", "Basic cmF5bW9uZDpJbml0MTIzNA==");
String auth = "ZRFC" + ":" + "Init1234";
String encodeAuth = "Basic " + new String(Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8)));
connection.setRequestProperty("Authorization", encodeAuth);
connection.setRequestProperty("X-CSRF-Token", "Fetch");
if (connection.getResponseCode() != 200) {
throw new RuntimeException(
"HTTP GET Request Failed with Error code : "
+ connection.getResponseCode());
}
// BufferedReader responseBuffer = new BufferedReader(
// new InputStreamReader((connection.getInputStream())));
// String output;
// System.out.println("Output from Server: \n");
// while ((output = responseBuffer.readLine()) != null) {
// System.out.println(output);
// }
//解析XML
DocumentBuilderFactory bbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = bbf.newDocumentBuilder();
Document doc = builder.parse(connection.getInputStream());
//Document doc = builder.parse("src/test.xml");
Element root = doc.getDocumentElement();
NodeList nodes = root.getChildNodes();
if (nodes != null) {
for ( int i = 0; i < nodes.getLength(); i++ ) {
Node node = nodes.item(i);
// TEXT_NODE 说明该节点是文本节点
// ELEMENT_NODE 说明该节点是个元素节点
if (node.getNodeType() == Node.ELEMENT_NODE) {
// （7）取得节点的属性值
// String email = user.getAttributes()
// .getNamedItem("email").getNodeValue();
// System.out.println(email);
// 注意，节点的属性也是它的子节点。它的节点类型也是Node.ELEMENT_NODE
// （8）轮循子节点
for (Node subnode = node.getFirstChild(); subnode != null; subnode = subnode.getNextSibling()) {
if (subnode.getNodeType() == Node.ELEMENT_NODE) {
}
// System.out.println("nodeName:" + subnode.getNodeType());
// System.out.println("nodeName:" + subnode.getNodeName());
// System.out.println("nodeVaule:" + subnode.getNodeValue());
}
}
}
}
// for( int i = 0; i < nodes.getLength(); i++ ) {
// Node node = nodes.item(i);
// System.out.println(node.getNodeValue());
// }
NodeList belnr = root.getElementsByTagName("d:BELNR");
belnr.item(0).getFirstChild().setNodeValue("510000");
System.out.println(belnr.item(0).getFirstChild().getNodeValue());
System.out.println(doc.toString());
//保存xml文件
TransformerFactory transformerFactory=TransformerFactory.newInstance();
Transformer transformer=transformerFactory.newTransformer();
DOMSource domSource=new DOMSource(doc);
//设置编码类型
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
//转换成xml文件
StreamResult result=new StreamResult(new FileOutputStream("src/new.xml"));
//StreamResult result=new StreamResult();
transformer.transform(domSource, result);
//转换成字符串
StringWriter strWriter = new StringWriter();
StreamResult resultStr = new StreamResult(strWriter);
transformer.transform(domSource, resultStr);
String requestBody = strWriter.getBuffer().toString();
System.out.println(requestBody);
//String cookie = connection.getHeaderField("Cookie");
String csrfToken = connection.getHeaderField("X-CSRF-Token");
System.out.println(manager.getCookieStore());
connection.disconnect();
//POST方法
HttpURLConnection connPost = (HttpURLConnection) new URL("http://vhcals4h.com:44301/sap/opu/odata/sap/ztest_srv/HEADERSet").openConnection();
connPost.setRequestMethod("POST");
connPost.setRequestProperty("Authorization", encodeAuth);
connPost.setRequestProperty("X-CSRF-Token", csrfToken);
connPost.setRequestProperty("Content-Type", "application/xml");
//connPost.setRequestProperty("Cookie", cookie);
connPost.setDoOutput(true);
connPost.setDoInput(true);
connPost.setUseCaches(false);
connPost.setRequestProperty("Connection","Keep-Alive");
OutputStream outStream = connPost.getOutputStream();
outStream.write(requestBody.getBytes());
outStream.flush();
outStream.close();
System.out.println(connPost.getResponseCode());
connPost.disconnect();
}
}
4、403错误；
解决方法：添加Cookie支持。
//添加cookie支持
CookieManager manager = new CookieManager();
//设置cookie策略，只接受与你对话服务器的cookie，而不接收Internet上其它服务器发送的cookie
manager.setCookiePolicy(CookiePolicy.ACCEPT_ORIGINAL_SERVER);
CookieHandler.setDefault(manager);
System.out.println(manager.getCookieStore());
另外还涉及到一些XML解析，以下为完整代码，包含GET和POST方法：
标签：java,ODATA,System,new,println,import,SAP,JAVA,out 来源： https://www.cnblogs.com/sharpmap/p/16257653.html