Spring Boot的filter(过滤器)简单使用实例详解

时间:2022-06-08 17:31:37

过滤器(Filter)的注册方法和 Servlet 一样,有两种方式:代码注册或者注解注册

1.代码注册方式

通过代码方式注入过滤器

?
1
2
3
4
5
6
@Bean
  public FilterRegistrationBean indexFilterRegistration() {
    FilterRegistrationBean registration = new FilterRegistrationBean(new IndexFilter());
    registration.addUrlPatterns("/");
    return registration;
  }

IndexFilter.Java类:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
package com.example.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class IndexFilter implements Filter{
  @Override
  public void destroy() {
    System.out.println("filter destroy method");
  }
  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
      throws IOException, ServletException {
    System.out.println("filter doFilter method");
  }
  @Override
  public void init(FilterConfig arg0) throws ServletException {
    System.out.println("filter init method");
  }
}

2.注解方式

通过注解方式注入过滤器

IndexFilter2.java类

?
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
package com.example.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
@WebFilter(urlPatterns = "/*", filterName = "indexFilter2")
public class IndexFilter2 implements Filter{
  @Override
  public void destroy() {
    System.out.println("filter2 destroy method");
  }
  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
      throws IOException, ServletException {
    System.out.println("filter2 doFilter method");
  }
  @Override
  public void init(FilterConfig arg0) throws ServletException {
    System.out.println("filter2 init method");
  }
}

把注解加到入口处启动即可

?
1
2
3
4
5
6
7
@SpringBootApplication
@ServletComponentScan
public class SpringBootSimpleApplication {
  public static void main(String[] args) {
    SpringApplication.run(SpringBootSimpleApplication.class, args);
  }
}

以上所述是小编给大家介绍的Spring Boot的filter(过滤器)简单使用,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!

原文链接:http://www.cnblogs.com/web424/p/6755957.html