java模拟登陆

最新推荐文章于 2023-06-21 16:40:01 发布

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最新推荐文章于 2023-06-21 16:40:01 发布

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分类专栏： web 文章标签： java string null url html date

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本文介绍了一个Java程序，该程序演示了如何实现用户的登录验证，并在登录成功后通过POST方式访问受权限保护的网页。文章详细展示了使用HttpURLConnection进行HTTP请求的方法，包括设置必要的请求头、发送登录数据获取Cookie，以及利用获得的Cookie访问受限资源。

本程序演示请求登陆系统后，继续通过post访问权限内的网页。

需要引入：commons-io-2.1.jar

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Date;

import org.apache.commons.io.IOUtils;

public class WdAdapter {

	private static WdAdapter wdAdapter;
	
	private WdAdapter(){}
	
	public static WdAdapter getInctance(){
		if(wdAdapter==null){
			wdAdapter = new WdAdapter();
		}
		return wdAdapter;
	}
	
	private String login(){
		
		String loginUrl = "http://218.22.6.150/csl/login";
		String username = "administrator";
		String password = "123456";

		String cookieVal = null;
				
		HttpURLConnection connection;
		OutputStreamWriter out = null;
		try {
			URL url = new URL(loginUrl);
			connection = (HttpURLConnection) url.openConnection();
			connection.setDoOutput(true);
			out = new OutputStreamWriter(connection.getOutputStream(), "GBK");
			out.write("username=" + username + "&userpwd=" + password); 
			out.flush();
			cookieVal = connection.getHeaderField("Set-Cookie");
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			try {
				if(out!=null){
					out.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}	
		}
		return cookieVal;
	}
	
	public String getInoutLog(String empUid,String sdate, String edate){
		String s = "http://218.22.6.150/csl/query?action=run&uid=" + empUid + "&sdate=" + sdate + "&edate=" + edate;
		HttpURLConnection resumeConnection = null;
		BufferedReader bufferedReader = null;
		String html = null;
		try {
			URL url = new URL(s);
			resumeConnection = (HttpURLConnection) url.openConnection();
			String cookieVal = this.login();
			if (cookieVal != null) {
				resumeConnection.setRequestProperty("Cookie", cookieVal);
			}
			resumeConnection.connect();
			InputStream urlStream = resumeConnection.getInputStream();
			bufferedReader = new BufferedReader(new InputStreamReader(urlStream,"GBK"));
			String ss = null;
			String total = "";
			while ((ss = bufferedReader.readLine()) != null) {
				total += ss;
			}
			html = new String(total.getBytes(),"utf-8");
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			try {
				if(bufferedReader!=null){
					bufferedReader.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
			resumeConnection.disconnect();
		}
		return html;
	}
	
	public String getInoutLog(String empUid,Date sdate, Date edate){
		String pattern = "";
		return this.getInoutLog(empUid, DateFormat.toString(sdate, pattern), DateFormat.toString(edate, pattern));
	}
	
	public static void main(String[] args) {
		try {
			String newStr = new String(WdAdapter.getInctance().getInoutLog("85", "2012-02-01", "2012-02-08").getBytes(),"utf-8");
			System.out.println(newStr);
			IOUtils.write(newStr, new FileOutputStream("d:/index.html"));
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
}