spring-boot实现增加自定义filter(新)

时间:2021-07-19 09:29:45

前言

传统的javaEE增加Filter是在web.xml中配置,如以下代码:

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<filter>
   <filter-name>TestFilter</filter-name>
    <filter-class>com.cppba.filter.TestFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>TestFilter</filter-name>
  <url-pattern>/*</url-pattern>
  <init-param>
    <param-name>paramName</param-name>
    <param-value>paramValue</param-value>
  </init-param>
</filter-mapping>

然而spring-boot中很明显不能这样实现,那怎么办呢?看完下面的教程,答案自然知道了。

老方法(新方法请直接下拉)

1.创建自定义Filter

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package com.cppba.filter;
 
import javax.servlet.*;
import java.io.IOException;
 
public class TestFilter implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
 
  }
 
  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
      throws IOException, ServletException {
    System.out.println("TestFilter");
  }
 
  @Override
  public void destroy() {
 
  }
}

2.在ApplicationConfiguration.java中增加一个@bean

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@Bean
 public FilterRegistrationBean testFilterRegistration() {
 
   FilterRegistrationBean registration = new FilterRegistrationBean();
   registration.setFilter(new TestFilter());
   registration.addUrlPatterns("/*");
   registration.addInitParameter("paramName", "paramValue");
   registration.setName("testFilter");
   registration.setOrder(1);
   return registration;
 }

3.启动项目

你会看到控制台打印如下代码:

spring-boot实现增加自定义filter(新)

4.访问项目

最后我们访问以下http://127.0.0.1:8080/test

如果你看到控制台打印出:TestFilter

spring-boot实现增加自定义filter(新)

恭喜你,配置成功!

2017-04-20 最新spring-boot增加Filter方法

首先定义一个Filter

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@Order(1)
//重点
@WebFilter(filterName = "testFilter1", urlPatterns = "/*")
public class TestFilterFirst implements Filter {
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
 
  }
 
  @Override
  public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
      throws IOException, ServletException {
    System.out.println("TestFilter1");
    filterChain.doFilter(servletRequest,servletResponse);
  }
 
  @Override
  public void destroy() {
 
  }
}

比较核心的代码是自定义类上面加上@WebFilter,其中@Order注解表示执行过滤顺序,值越小,越先执行

我们在spring-boot的入口处加上如下注解@ServletComponentScan:

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@SpringBootApplication(scanBasePackages = "com.cppba")
//重点
@ServletComponentScan
public class Application {
  public static void main(String[] args) throws UnknownHostException {
    SpringApplication app = new SpringApplication(Application.class);
    Environment environment = app.run(args).getEnvironment();
  }
}

这种方法效果和上面版本一样,但是用起来更加方便!以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://www.jianshu.com/p/05c8be17c80a