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简单的实现登录拦截及统一异常处理(自定义异常)

程序员文章站 2024-01-31 23:43:10
webmvc配置类: 注:registry.addInterceptor(拦截器类对象).addPathPatterns("需要拦截的请求路径").excludePathPatterns("可以放行的请求路径"); 拦截器类,这里为登录拦截 到这里实现了简单的登录拦截,但是上面通过response对 ......

webmvc配置类:

@configuration
public class webmvcconfig extends webmvcconfigurationsupport{

    @override
    protected void addinterceptors(interceptorregistry registry) {
        registry.addinterceptor(new logininterceptor())
        .addpathpatterns("/**")
        .excludepathpatterns("/user/login");
    }
}

注:registry.addinterceptor(拦截器类对象).addpathpatterns("需要拦截的请求路径").excludepathpatterns("可以放行的请求路径");

 

拦截器类,这里为登录拦截

public class logininterceptor implements handlerinterceptor{

    @override
    public void aftercompletion(httpservletrequest arg0, httpservletresponse arg1, object arg2, exception arg3)
            throws exception {
        // todo auto-generated method stub
        
    }

    @override
    public void posthandle(httpservletrequest arg0, httpservletresponse arg1, object arg2, modelandview arg3)
            throws exception {
        // todo auto-generated method stub
        
    }

    @override
    public boolean prehandle(httpservletrequest hservletrequest, httpservletresponse hservletresponse, object object) throws exception {
        // 案例采用session存储登录用户,所以从session获取登录用户
     httpsession session = hservletrequest.getsession(); tuser tuser=(tuser)session.getattribute("user");
// 判断session里是否能取出用户 if(tuser==null) { returnerrormessage(hservletresponse, "当前操作需要先进行用户登录"); return false; } return true; } private void returnerrormessage(httpservletresponse response, string errormessage) throws ioexception { response.setcharacterencoding("utf-8"); map<string, object> var=new hashmap<>(); var.put("success", false); var.put("errormessage", errormessage); response.setcontenttype("application/json"); printwriter out = response.getwriter(); objectmapper mapper = new objectmapper(); string jsonofrst =mapper.writevalueasstring(var); out.print(jsonofrst); out.flush(); } }

到这里实现了简单的登录拦截,但是上面通过response对象获取的输出流来写入错误信息,下面采用自定义异常来处理

 

异常类

public class unloggedexception extends runtimeexception{
    private static final long serialversionuid = 181074719716690931l;
    
    public unloggedexception() {
        super("当前操作需要先进行登录");
    }
}

修改拦截器类的prehandle方法,于是returnerrormessage方法可以去掉了

@override
    public boolean prehandle(httpservletrequest hservletrequest, httpservletresponse hservletresponse, object object) throws exception {
        httpsession session = hservletrequest.getsession();
        tuser tuser=(tuser)session.getattribute("user");
        if(tuser==null) {
            throw new unloggedexception();
        }
        return true;
    }

最后配置异常处理类

@controlleradvice
@responsebody
public class globalexceptionhandler {
    @exceptionhandler
    public jsonobject handleexception(exception e) {
        return actionhelper.responsefailed(e.getmessage());
    }
}

上面的返回值及actionhelper为我使用的返回工具类,依赖为com.alibaba的fastjson,版本参考1.2.49。

可以根据实际情况修改返回方式及返回值。

此后所有的异常,都可以通过自定义异常的方式,交由异常处理类来进行处理,返回结果。