SpringBoot 拦截器
web拦截器作用有权限控制，日志记录等等。SpringBoot 提供 HandlerInterceptor方便我们开发；
我们定义一个自定义拦截器 实现HandlerInterceptor接口，实现三个方法，preHandle是 请求处理之前调用，postHandle是请求处理之后并且视图渲染之前调用，afterCompletion请求结束之后并且视图渲染之后调用；
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
package
com.java1234.interceptor;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
org.springframework.web.servlet.HandlerInterceptor;
import
org.springframework.web.servlet.ModelAndView;
/**
* 自定义拦截器
* @author Administrator
*
*/
public
class
MyInterceptor
implements
HandlerInterceptor{
@Override
public
boolean
preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws
Exception {
System.out.println(
"========MyInterceptor preHandle 请求处理之前调用================="
);
return
true
;
}
@Override
public
void
postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView)
throws
Exception {
System.out.println(
"========MyInterceptor postHandle 请求处理之后并且视图渲染之前调用================="
);
}
@Override
public
void
afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws
Exception {
System.out.println(
"========MyInterceptor afterCompletion 请求结束之后并且视图渲染之后调用================="
);
}
}
|
我们再定义一个类继承WebMvcConfigurerAdapter，重写addInterceptors，我们把自定义拦截器添加到拦截器链中去。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
package
com.java1234.config;
import
org.springframework.context.annotation.Configuration;
import
org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import
org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import
com.java1234.interceptor.MyInterceptor;
@Configuration
public
class
MyWebAppConfigurer
extends
WebMvcConfigurerAdapter{
@Override
public
void
addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(
new
MyInterceptor()).addPathPatterns(
"/**"
);
// 添加拦截器 以及 拦截器规则
super
.addInterceptors(registry);
}
}
|
简单搞个控制器类测试下；
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
package
com.java1234.action;
import
org.springframework.stereotype.Controller;
import
org.springframework.web.bind.annotation.RequestMapping;
import
org.springframework.web.bind.annotation.ResponseBody;
/**
* 用户Controller
* @author Administrator
*
*/
@Controller
@RequestMapping
(value =
"/user"
)
public
class
UserController {
@ResponseBody
@RequestMapping
(value =
"/login"
)
public
String login(){
System.out.println(
"login"
);
return
"测试拦截器"
;
}
}
|
项目配置文件配置下：
|
1
2
3
|
server:
port: 80
context-path: /
|
启动项目，运行 http://localhost/user/login
扫描二维码关注公众号，回复：
2540787 查看本文章
执行结果如下：
========MyInterceptor preHandle 请求处理之前调用=================
login
========MyInterceptor postHandle 请求处理之后并且视图渲染之前调用=================
========MyInterceptor afterCompletion 请求结束之后并且视图渲染之后调用=================
测试代码：