登录功能实现代码

简单的登录代码实现

第一步，页面提交登录请求

//form表单提交请求

<form id="loginFrom">
<div>
<h2>管理登录</h2>
<span><label>用户名</label></span>
<span><input type="text" id="sysloginname" name="sysloginname" onkeypress="if(event.keyCode==13){ doLogin()};" class="validate[require] textbox" maxlength="15"/></span>
</div>
<div>
<span><label>密码</label></span>
<span><input type="password" id="sysloginpass" name="sysloginpass" onkeypress="if(event.keyCode==13){ doLogin()};" class="validate[require] password " maxlength="15"/></span>
</div>
<div class="sign">
<input type="button" value="登录" class="submit" onclick="doLogin();" />
</div>
</form>

//登录JS
function doLogin() {
if ($("#loginFrom").validationEngine('validate')) {
var submitOptions = {
target : '#loginFrom',
url : "${pageContext.request.contextPath}/dologin.htm",
type : 'post',
dataType : 'html',
cache : false,
async : false,
error : function(xhr) {
},
success : function(data) {
var r = eval('(' + data + ')');
if (r.flag) {
window.location.href = "${pageContext.request.contextPath}/toappmain.htm";
} else {
alert(r.msg);
}
}
}
$('#loginFrom').ajaxSubmit(submitOptions);
}
}

第二步，action中处理请求
@RequestMapping(value = "dologin.htm")
public void doLogin(HttpSession httpsession, HttpServletRequest req,HttpServletResponse res, ModelMap model,String sysloginname,String sysloginpass) throws Exception{
if(checkStr(sysloginname)){
this.renderText("{'flag':false,'msg':'登录名错误！'}", res);
}
else if(checkStr(sysloginpass)){
this.renderText("{'flag':false,'msg':'登录密码错误！'}", res);
}else{
Map<String, Object> map = new HashMap<String, Object>();
map.put("sysloginname", sysloginname);
map.put("sysloginpass", MD5.convert(sysloginpass));
MgrSysAccount appsysaccount = this.mgrSysAccountService.getLoginInfoByMap(map);
if(appsysaccount!=null){
MgrSysAccount updatedate = new MgrSysAccount();//用于修改最后一次登录时间
updatedate.setId(appsysaccount.getId());
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
updatedate.setLastlogintime(simpleDateFormat.format(new Date()));
mgrSysAccountService.updateEntity(updatedate);
httpsession.setAttribute("syslogininfo", appsysaccount);
this.renderText("{'flag':true}", res);
}else{
this.renderText("{'flag':false,'msg':'登录失败！'}", res);
}

}

}

/**
* 校验非法字符
* @param 校验的字符串
* @return
*/
public boolean checkStr(String str) {
if (StringUtils.isBlank(str.trim())) {
return true;
}
String inj_str = "‘,*,%,;,/,+,&,|,(,),$,!,[,]";
String[] inj_stra = inj_str.split(",");
for (int i = 0; i < inj_stra.length; i++) {
if (str.indexOf(inj_stra[i]) >= 0) {
return true;
}
}
return false;
}

/**
* 输出Text类型
*
* @param response
* @param text
*/
protected void renderText(String text, HttpServletResponse res) {
render(text, "text/plain;charset=UTF-8", res);
}

/**
* 封装response用于json输出
*
* @param text
* @param contentType
*/
protected void render(String text, String contentType,
HttpServletResponse res) {
try {
res.setContentType(contentType);
res.getWriter().write(text);
res.getWriter().flush();
res.getWriter().close();
} catch (IOException e) {
System.out.println(e);
}
}