学校图书馆登陆模拟

public class Main {
	public static void main(String[] args) throws IOException {

		String number= "***";
		String passwd = "****";
		
		//第一次让服务器建立一个sessionid，获取到这个id
		URL httpUrl =  new URL("http://210.45.147.188:8080/reader/login.php");
		HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
		String sessionIdStr = conn.getHeaderField("Set-Cookie").substring(0,36);
		conn.disconnect();
		
		//第二次访问登陆验证，带上sessionid，发现get可以直接登陆
		//密码正确的话是一个302跳转
		httpUrl =  new URL("http://210.45.147.188:8080/reader/redr_verify.php?number="+number+"&passwd="+passwd+"&select=cert_no&returnUrl=");
		conn = (HttpURLConnection) httpUrl.openConnection();
		conn.addRequestProperty("Cookie", sessionIdStr);
		//为了获取302返回的Location,所以禁止自动跳转到302之后的地址
		conn.setInstanceFollowRedirects(false);
		String location = conn.getHeaderField("Location");

		boolean goNext = false;
		if ("redr_con.php".equals(location)) {
			System.out.println("您尚未完成身份认证，请进行身份核实, 如果认证失败，您将不能使用我的图书馆功能");
		}else if(location==null){
			System.out.println("对不起，密码错误，请查实！");
		}else{//redr_info.php
			System.out.println("成功登入系统....");
			goNext = true;
		}
		conn.disconnect();
		
		if (!goNext) {
			return;
		}

		//进入用户信息首页
		//登陆成功时，服务器会把账号和sessionid，后面的操作都不需要用户名和密码了
		httpUrl =  new URL("http://210.45.147.188:8080/reader/redr_info.php");
		conn = (HttpURLConnection) httpUrl.openConnection();
		conn.addRequestProperty("Cookie", sessionIdStr);
		
		//输出学生信息
		showUserInfo(changeStreamToString(conn.getInputStream(),"utf-8"));
        
		//输出所有历史借阅信息
		httpUrl =  new URL("http://210.45.147.188:8080/reader/book_hist.php?para_string=all");
		conn = (HttpURLConnection) httpUrl.openConnection();
		conn.addRequestProperty("Cookie", sessionIdStr);
		showBorrowInfo(changeStreamToString(conn.getInputStream(),"utf-8"));
	}
	
	//显示个人信息
	public static void showUserInfo(String htmlStr){
		//使用Jsoup解析Html文档
		Document document = Jsoup.parse(htmlStr);
		Elements tds = document.getElementById("mylib_info").getElementsByTag("td");
		Elements spans = document.getElementById("mylib_info").getElementsByTag("span");
		for(int i=1;i<tds.size();i++){
			System.out.println(spans.get(i).ownText()+tds.get(i).ownText());
		}
	}
	
	//显示所有借阅历史
	public static void showBorrowInfo(String htmlStr){
		
		Document document = Jsoup.parse(htmlStr);
		Elements trs = document.getElementById("mylib_content").getElementsByTag("tr");
		
		for(Element tr:trs){
			for(Element td:tr.getElementsByTag("td")){
				if (td.getElementsByTag("a").size()!=0) {
					System.out.print(td.getElementsByTag("a").get(0).ownText()+"\t");
				}else{
					System.out.print(td.ownText()+"\t");
				}
			}
			System.out.println();
		}
	}
	
	public static String changeStreamToString(InputStream inputStream,String edcode) throws IOException{
		BufferedReader in = new BufferedReader(new InputStreamReader(inputStream,edcode));
		String line;
		StringBuffer result = new StringBuffer();
		while ((line = in.readLine()) != null)
        		result.append(line);
		return result.toString();
	}
}