项目实践――MD5加密
来源：程序员人生 发布时间：2015-06-11 09:11:57 阅读次数：3318次
在项目中，需要用MD5进行加密，这里分享1个MD5加密类。
MD5加密类：
public class Md5 {
private static String DEFAULT_JCE = "com.sun.crypto.provider.SunJCE";
private static String IBM_JCE = "com.ibm.crypto.provider.IBMJCE";
protected static final Log log = LogFactory.getLog(Md5.class);
/**
* 初始化系统加密算法提供者
*/
static
{
try
{
Security.addProvider((Provider)Class.forName(DEFAULT_JCE).newInstance());
}
catch (Exception e)
{
log.info(e);
try
{
Security.addProvider((Provider)Class.forName(IBM_JCE).newInstance());
}
catch (Exception ex)
{
log.info(ex);
}
}
}
/**
* get hex string
*
* @param x
* @return
*/
private static String hexDigit(byte x)
{
StringBuffer sb = new StringBuffer();
char c;
// First nibble
c = (char) ((x >> 4) & 0xf);
if (c > 9)
{
c = (char) ((c - 10) + 'a');
}
else
{
c = (char) (c + '0');
}
sb.append(c);
// Second nibble
c = (char) (x & 0xf);
if (c > 9)
{
c = (char) ((c - 10) + 'a');
}
else
{
c = (char) (c + '0');
}
sb.append(c);
return sb.toString();
}
/**
* 加密
*
* @param content
* 加密内容
* @return 加密串
*/
public static String encrypt(String content)
{
try
{
MessageDigest algorithm = null;
algorithm = MessageDigest.getInstance("MD5");
algorithm.reset();
if (content != null)
{
algorithm.reset();
algorithm.update(content.getBytes());
byte digest[] = algorithm.digest();
StringBuffer hexString = new StringBuffer();
int digestLength = digest.length;
for (int i = 0; i < digestLength; i++)
{
hexString.append(hexDigit(digest[i]));
}
return hexString.toString();
}
else
{
return "";
}
}
catch (NoSuchAlgorithmException ex)
{
//加密进程中出现异常，采取原始的的内容串
return content;
}
}
}
运行测试：
@Test
public void testMd5(){
System.err.println(this.encrypt("123456"));
}
结果：
e10adc3949ba59abbe56e057f20f883e
用户登录：
@RequestMapping("/login.do")
@ResponseBody
@Override
public Object login(HttpServletRequest request, HttpServletResponse response) {
Logger log = Logger.getLogger(getClass());
String biskeep = "";
Md5 md5=new Md5();
try {
String loginName = request.getParameter("loginName");
String loginPassword = md5.encrypt(request.getParameter("loginPassword"));
HttpSession session = request.getSession();
if (loginName != null && !loginName.trim().equals("")
&& loginPassword != null
&& !loginPassword.trim().equals("")) {
SysUser user = userService.queryUser(loginName, loginPassword);
biskeep = user.getBiskeep();
// 查询该用户的部门信息
String deptIdStr = user.getDepartmentid();
SysDept sysDept=deptService.queryEntityById(SysDept.class, deptIdStr);
// SysDept sysDept=null;
// 查询该用户的角色信息，应当是1个list集合
String roleIdStr = roleService.getRoleIdStr(user.getId());
session.setAttribute(ConstValues.LOGIN_DEPT_ID, deptIdStr);
session.setAttribute(ConstValues.LOGIN_ROLE_ID, roleIdStr);
session.setAttribute(ConstValues.LOGIN_DEPT_TYPE, sysDept.getCdeptno());
session.setAttribute("depId", deptIdStr);
// 将用户信息放入到session中去
session.setAttribute(ConstValues.LOGIN_USER_NAME,user.getCloginname());
session.setAttribute(ConstValues.LOGIN_USER_ID, user.getId());
session.setAttribute(ConstValues.LOGIN_FIRSTNAME,user.getFirstname());
session.setAttribute(ConstValues.LOGIN_LASTNAME,user.getLastname());
session.setAttribute(ConstValues.LOGIN_USER_PASSWORD, user.getCpassword());
String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0
|| "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
log.info("本机ip：" + ip);
session.setAttribute(ConstValues.LOGIN_IP, ip);
Map<String, String> param = new HashMap<String, String>();
param.put("ip", ip);
}
JSONObject obj = createSuccessMessage(null);
obj.put("biskeep", biskeep);
String depId = (String) session.getAttribute(ConstValues.LOGIN_DEPT_ID);
String ss = (String) session.getAttribute(ConstValues.LOGIN_USER_ID);
return obj.toString();
} catch (Exception e) {
e.printStackTrace();
return createErrorMessage(e.getMessage()).toString();
}
}
思路很简单，数据库存的密码是经过MD5加密过的，将用户登录的密码亦经过MD5加密，匹配成功便可登录
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