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jsp------实现MD5加密

2016-06-03 21:18 411 查看

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<%@page import="java.net.*" %>
<%@page import="comm.MakeMD5" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>MyIndex</title>
<meta http-equiv="imurl" content="no-cache">
</head>

<body>
<%
boolean loginFlag=false;
String account=null;
String md5Account=null;
Cookie cookieArr[]=request.getCookies();
if(cookieArr!=null&&cookieArr.length>0){
for(Cookie cookie:cookieArr){
if(cookie.getName().equals("account")){
account=cookie.getValue();
account=URLDecoder.decode(account,"utf-8");
//System.out.print(account);
}
if(cookie.getName().equals("md5Account")){
md5Account=cookie.getValue();
md5Account=URLDecoder.decode(md5Account,"utf-8");
//System.out.print(md5Account);
}
}
}

if(account!=null&&md5Account!=null){
loginFlag=md5Account.equals(MakeMD5.getMD5(account));
}

if(loginFlag){
//request.getRequestDispatcher("successlogin.jsp").forward(request, response);
//response.sendRedirect("successlogin.jsp");
%>
<fieldset>
<legend>欢迎您回来</legend>
<table align="center">
<tr>
<td><%=account %>，欢迎您登陆本网站</td>
<td align="center">
<a href="foreverlogin?action=logout">注销登陆</a>
</td>
</tr>
</table>
</fieldset>
<%
}else{
%>
<fieldset>
<legend>用户登录</legend>
<form action="foreverlogin?action=login" method="post">
<table>
<tr>
<td>账  号:</td>
<td><input type="text" name="account"></td>
</tr>
<tr>
<td>密  码:</td>
<td><input type="text" name="password"></td>
</tr>
<tr>
<td>有效期:</td>
<td>
<input type="radio" name="timeout" value="-1" checked="checked">
关闭浏览器即失效
<input type="radio" name="timeout" value="<%=30*24*60*60%>">
30天内有效
<input type="radio" name="timeout" value="<%=Integer.MAX_VALUE%>">
永久有效
</td>
</tr>
<tr>
<td>
<input type="submit" value="登陆"> 
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</fieldset>
<%
}
%>
</body>
</html>

src/comm/foreverlogin.java

package comm;

import java.io.IOException;
import java.net.URLEncoder;

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

public class foreverlogin extends HttpServlet {
private static final long serialVersionUID = 1L;

public foreverlogin() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");

String action=request.getParameter("action");
if(action.equals("login")){
login(request,response);
}
else if(action.equals("logout")){
logout(request,response);
}
}

//login
public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
String account=request.getParameter("account");
//String password=request.getParameter("password");
int timeout=Integer.parseInt(request.getParameter("timeout"));

String md5Account=MakeMD5.getMD5(account);  //采用MD5算法加密
account=URLEncoder.encode(account,"utf-8"); //账号为中文时需要转换Unicode才能保存在Cookie中
Cookie accountCookie=new Cookie("account",account);
accountCookie.setMaxAge(timeout);
Cookie md5AccountCookie=new Cookie("md5Account",md5Account);
md5AccountCookie.setMaxAge(timeout);
response.addCookie(accountCookie);
response.addCookie(md5AccountCookie);

//将线程休眠1秒后在执行
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//response.sendRedirect("cookie/resultlogin.jsp?"+System.currentTimeMillis());
response.sendRedirect("cookie/index.jsp?"+System.currentTimeMillis());
}

//logout
public void logout(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
Cookie accountCookie=new Cookie("account","");
accountCookie.setMaxAge(0);
Cookie md5AccountCookie=new Cookie("md5Account","");
md5AccountCookie.setMaxAge(0);
response.addCookie(accountCookie);
response.addCookie(md5AccountCookie);

//将线程休眠一秒后在执行
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

response.sendRedirect("cookie/index.jsp?"+System.currentTimeMillis());
}

public void init() throws ServletException {
// Put your code here
}

}

src/comm/MakeMD5.java

package comm;

import java.security.MessageDigest;

public class MakeMD5 {
public final static String getMD5(String str){
// 用来将字节转换成 16 进制表示的字符
char hexDiagiArr[]={'0','1','2','3','4','5','6','7','8','9','0','a','b','c','d','e','f'};
MessageDigest digest=null;
try{
digest=MessageDigest.getInstance("MD5");     //创建MD5算法摘要
digest.update(str.getBytes());                 //更新摘要
byte mdBytes[]=digest.digest();                 //加密，并返回字节数组
//新建字符数组，长度为myBytes字节数组的2倍，用于保存加密后的值
char newCArr[]=new char[mdBytes.length*2];
int k=0;
for(int i=0;i<mdBytes.length;i++){
byte byte0=mdBytes[i];
newCArr[k++]=hexDiagiArr[byte0>>>4&0x0f]; //取字节中高 4 位的数字转换,>>>为逻辑右移，将符号位一起右移
newCArr[k++]=hexDiagiArr[byte0&0x0f];     //取字节中低 4 位的数字转换
//针对字符0-9的，0-9的ascii码值为0x30，0x31，0x32 0x33 ...0x39，
//因此与0x0f按位与后只保留个位上的书即0x0，0x1，。。。0x9
//  0000 1010
//& 0000 1111
//  0000 1010
}
return String.valueOf(newCArr);   //将转换后的字符转换为字符串
}
catch(Exception e){
e.printStackTrace();
}
return null;
}
}

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