Java calls third-party http interface single sign-on HttpClient

How Java calls the third-party http interface

Demonstration of Java calling third-party interfaces

example:

Response form:

Main logic:

访问此地址：http:// { cas }/cas/login?service=http://localhost/Demo

认证通过后：http://localhost/Demo?ticket=ST-9-C6sjiJ4xqn0ydAsWSXBt-{ cas }

后端访问地址为：http://{ cas }/cas/serviceValidate?ticket={ ticket }&service={ service }

校验通过：重定向登录操作

achieve: 

package com.company.xxx.servlet;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.xxx.FUser;
import com.xxx.FUserFilterAdmin;
import com.xxx.Context;
import com.xxx.SystemContextUtil;


public class HEBOAServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	public static String exitUrl = "";

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/json;charset=utf-8");
		//
		String requestURL = req.getRequestURL().toString();
		String[] split = requestURL.split("\\?");
		String service = split[0]; 
		String requestURI = req.getRequestURI();
		String exitAddress = requestURL.replace(requestURI, "");
		
		// TODO 获取 TICKET
		String ticket = req.getParameter("ticket");
		if (null == ticket) {
			resp.sendRedirect(exitAddress);
			return;
		}

		String strURL = "http://cas.xxx.edu.cn/cas/serviceValidate?ticket=" + ticket + "&service=" + service;
		// TODO 发送请求
		HttpURLConnection httpConn = null;
		BufferedReader reader = null;
		String xmlStr = "";
		try {
			URL url = new URL(strURL);
			httpConn = (HttpURLConnection) url.openConnection();
			httpConn.setRequestMethod("GET");
			httpConn.connect();
			reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));
			String line;
			StringBuffer buffer = new StringBuffer();
			while ((line = reader.readLine()) != null) {
				buffer.append(line);
			}
			xmlStr = new String(buffer.toString().getBytes("gbk"), "utf-8");
		} catch (ProtocolException e) {
			e.printStackTrace();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (null != reader) {
					reader.close();
				}
				if (null != httpConn) {
					httpConn.disconnect();
				}
			} catch (Exception e) {
			}
		}
		
		// TODO 截取XML信息
		if (!xmlStr.equals("")) {
			Map<String, String> map = getUserFromXmlStr(xmlStr);
			String responseStr = map.get("tip");
			if (map.get("code").equals("false")) {
				// resp.getWriter().print(responseStr);
				resp.sendRedirect(exitAddress);
			} else {
				// TODO 用户是否存在
				boolean isHave = isHaveUser(responseStr);
				String address = requestURL.replace(requestURI, "//login,oa,dontCareThisValue," + responseStr);
				String URL = "http://cas.xxx.edu.cn/cas/logout?service=" + address;
				if (isHave) {
					exitUrl = "http://cas.xxx.edu.cn/cas/logout?service=" + exitAddress;
					resp.sendRedirect(address);
				} else {
					resp.sendRedirect(URL);
				}
			}
		}

	}

	/**
	 * 是否存在当前用户且未停用
	 * 
	 * @param responseStr
	 * @return
	 */
	private boolean isHaveUser(String responseStr) {
		boolean isHave = false;
		Context context = SystemContextUtil.getContext();
		List<FUser> list = context.getList(FUser.class, new FUserFilterAdmin());
		if (null != list && list.size() > 0) {
			for (FUser fUser : list) {
				if (fUser.getName().equals(responseStr) && !fUser.isLocked()) {
					isHave = true;
					break;
				}
			}
		}
		return isHave;
	}

	/**
	 * XML 解析
	 * 
	 * @param xmlStr
	 * @return
	 */
	private Map<String, String> getUserFromXmlStr(String xmlStr) {
		Map<String, String> map = new HashMap<String, String>();
		int start = 0;
		int end = 0;
		String failTicket = "<cas:authenticationFailure code='INVALID_TICKET'>";
		int failTicketLength = failTicket.length();
		String failService = "<cas:authenticationFailure code='INVALID_SERVICE'>";
		int failServiceLength = failService.length();
		String failEnd = "</cas:authenticationFailure>";
		//
		String successStart = "<cas:user>";
		int successLength = successStart.length();
		String successEnd = "</cas:user>";
		//
		if (xmlStr.contains(failTicket)) {
			start = xmlStr.indexOf(failTicket);
			end = xmlStr.indexOf(failEnd);
			xmlStr = xmlStr.substring(start + failTicketLength, end);
			map.put("code", "false");
			map.put("tip", xmlStr);
		} else if (xmlStr.contains(failService)) {
			start = xmlStr.indexOf(failService);
			end = xmlStr.indexOf(failEnd);
			xmlStr = xmlStr.substring(start + failServiceLength, end);
			map.put("code", "false");
			map.put("tip", xmlStr);
		} else if (xmlStr.contains(successEnd)) {
			start = xmlStr.indexOf(successStart);
			end = xmlStr.indexOf(successEnd);
			xmlStr = xmlStr.substring(start + successLength, end);
			map.put("code", "true");
			map.put("tip", xmlStr);
		} else {
			map.put("code", "false");
			map.put("tip", "Service not allowed to validate tickets! 或者  解析XML失败!");
		}
		return map;
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doGet(req, resp);
	}

}

Implementation problems:

        java.net.UnknownHostException: cas.xxx.edu.cn

Error log:

java.net.UnknownHostException: cas.xxx.edu.cn
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:579)
	at java.net.Socket.connect(Socket.java:528)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
	at sun.net.www.http.HttpClient.New(HttpClient.java:308)
	at sun.net.www.http.HttpClient.New(HttpClient.java:326)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:997)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:851)
	at com.jiuqi.pms.common.cashrbeu.servlet.HEBOAServlet.doGet(HEBOAServlet.java:53)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
	at com.jiuqi.dna.core.impl.ServletValidateFilter.doFilter(ServletValidateFilter.java:58)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
	at com.company.dna.core.jetty.JettyServer$2.doHandle(JettyServer.java:401)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:366)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
	at com.company.dna.core.jetty.HttpWorkForJetty.doWork(HttpWorkForJetty.java:21)
	at com.company.dna.core.spi.work.WorkingThread.run(WorkingThread.java:44)

Solution:    

添加  cas.xxx.edu.cn  映射关系    xxx.xxx.xxx.xx    cas.xxx.edu.cn 

java.net.UnknownHostException exception handling

java.net.UnknownHostException exception handling