我要评论前提是前端必须有接收后端信息的载体：比如：ajax的异步接收等等。
后端：
编写后端的统一返回信息类：
/**
* 后端统一返回结果
* @param <t>
*/
@data
public class result<t> implements serializable {
private integer code;//1成功，0和其他数字为失败。
private string msg;//错误信息
private t data;//数据
public static <t> result<t> success(){
result<t> result = new result<t>();
result.code=1;
return result;
}
public static <t> result<t> success(t object){
result<t> result = new result<t>();
result.data=object;
result.code=1;
return result;
}
public static <t> result<t> error(string msg){
result<t> result = new result<t>();
result.code=0;
result.msg=msg;
return result;
}
}异常基础类：
/**
* 业务异常
*/
public class baseexception extends runtimeexception{
public baseexception(string message) {
super(message);
}
public baseexception() {
}
}账号不存在异常：
/**
* 账号不存在异常
*/
public class accountnotfoundexception extends baseexception {
public accountnotfoundexception() {
}
public accountnotfoundexception(string msg) {
super(msg);
}
}账号密码为空异常：
/**
* 账号密码为空
*/
public class inputaccountandpassword extends baseexception{
public inputaccountandpassword(string message) {
super(message);
}
}
登录失败异常：
/**
* 登录失败
*/
public class loginfailedexception extends baseexception{
public loginfailedexception(string msg){
super(msg);
}
}密码错误：
/**
* 密码错误异常
*/
public class passworderrorexception extends baseexception {
public passworderrorexception() {
}
public passworderrorexception(string msg) {
super(msg);
}
}全局异常类：
/**
* 全局异常处理
*/
//@controlleradvice(annotations = {restcontroller.class,controller.class})
//@responsebody
@slf4j
@restcontrolleradvice
public class globalexceptionhandler {
/**
* 业务异常
* @param ex 异常信息
* @return 封装、抛出给前端
*/
@exceptionhandler
public result<string> exceptionhandler(baseexception ex){
log.error(ex.getmessage());
return result.error(ex.getmessage());
}
@exceptionhandler
public result<string> exceptionhandler(expiredjwtexception ex){
string message=ex.getmessage();
if (message.contains("expired")){
return result.error("登录过期！");
}
return null;
}
}举例：
登录的服务
@service
@slf4j
public class loginserviceimpl implements loginservice {
@autowired(required = false)
private loginmapper loginmapper;
/**
* 用户登录
* @param user 用户
*/
public void userlogin(user user) {
string email = user.getemail();
string password = user.getpassword();
if (email.isempty() || password.isempty()) {
//账号密码为空
throw new inputaccountandpassword(messageconstant.account_password_empty);
}
//账号密码不为空
else {
//验证账号
int i = loginmapper.userexist(email);
//账号存在
if (i > 0) {
//验证密码
int p = loginmapper.logincheck(email, password);
//密码正确
if (p == 1) {
//准许登录 state==1
loginmapper.login(email);
}
else {
//密码错误
throw new passworderrorexception(messageconstant.password_error);
}
}
//账号不存在
else {
throw new accountnotfoundexception(messageconstant.account_not_found);
}
}
}
}
异常提示常量类messageconstant：
/**
* 信息提示常量类
*/
public class messageconstant {
public static final string password_error = "密码错误";
public static final string account_not_found = "账号不存在";
public static final string login_failed = "登录失败";
public static final string account_password_empty="请输入账号和密码";
}控制端：
@restcontroller
@requestmapping("/login")
@slf4j
public class logincontroller {
@autowired(required = false)
private loginservice loginservice;
@autowired
private jwtproperties jwtproperties;
@postmapping("/userlogin")
public result login(@requestbody user user){
log.info("开始登录：email:{},password:{}",user.getemail(),user.getpassword());
log.info("{}",user);
loginservice.userlogin(user);
//登录成功后，生成jwt令牌
map<string, object>claims=new hashmap<>();
claims.put("userid",1l);
claims.put("email",user.getemail());
string token= jwtutil.createjwt(
jwtproperties.getusersecretkey(),
jwtproperties.getuserttl(),
claims);
userdto userdto = new userdto();
userdto.settoken(token);
log.info("生成的token是：{}",token);
return result.success(userdto);
}
}前端登录页面以及ajax的测试用例：
<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<title>欢迎登录公司员工考勤管理平台</title>
<link rel="shortcut icon" th:href="@{/images/icon.svg}" rel="external nofollow" >
<link rel="stylesheet" type="text/css" th:href="@{/css/bootstrap.css}" rel="external nofollow" >
<script th:src="@{/js/jquery-3.2.1.js}"></script>
<script th:src="@{/js/token.js}"></script>
<script type="text/javascript">
$(function () {
let token=null;
//登录按钮
$("#login").click(function () {
let email=$('#email').val();
let password=$('#password').val();
$.ajax({
type:"post",
url:"/login/userlogin",
contenttype:"application/json",
data:json.stringify({"email":email,"password":password}),
success:function (result) {
if (result.code===1){
token=result.data.token;
alert("登录成功");
// 收到token，开始存储token
localstorage.setitem('token',token);
alert("token值为:"+token+"!");
//返回token给后端
//返回后端
location.href="/main" rel="external nofollow" ;//也会经过拦截器
}else {
alert(result.msg);
}
}
});
});
$("#registry").click(function () {
location.href="/registry" rel="external nofollow"
})
})
</script>
</head>
<body style="position: absolute;
top: 20%;
left: 38%;
transform: translate(40%,40%);
margin: 0;padding: 0">
<div>
<h2>登录页面</h2>
</div>
<div>
<label for="email"></label><input type="text" id="email" name="email" placeholder="e-mail address">
</div>
<div>
<label for="password"></label><input type="password" id="password" name="password" placeholder="password"/>
</div>
<button id="login">登录</button>
<button id="registry">注册</button>
</body>
</html>测试：
账号密码不为空：
后台：
账号不存在：
后台：
密码错误：
后台：
还有很多其他的情况......
tips：其实有些情况可以直接在前端判断，没有必要全部都给到后台判断，这样会造成后台压力比较大；比如密码账号不为空，账号格式等等。
总结
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