【系统学习SpringBoot】SpringBoot自定义Filter

SpringBoot自定义Filter

SpringBoot自动添加了OrderedCharacterEncodingFilter和HiddenHttpMethodFilter，当然我们可以自定

义Filter。

自定义Filter需要两个步骤：

实现Filter【javax.servlet.Filter】接口，实现Filter方法

添加 @Configuration 注解，将自定义Filter加入过滤链

【过滤打印请求URL】实例代码如下：

package xatu.zsl.Filter;

import org.apache.catalina.filters.RemoteIpFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
* Created by zsl on 2017/9/3.
*/
@Configuration
public class ConfigurationFilter {
@Bean
public RemoteIpFilter remoteIpFilter() {
return new RemoteIpFilter();
}

@Bean
public FilterRegistrationBean testFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new MyFilter());//添加过滤器
registration.addUrlPatterns("/*");//设置过滤路径，/*所有路径
registration.addInitParameter("name", "alue");//添加默认参数
registration.setName("MyFilter");//设置优先级
registration.setOrder(1);//设置优先级
return registration;
}

public class MyFilter implements Filter {
@Override
public void destroy() {
}

@Override
public void doFilter(ServletRequest srequest, ServletResponse sresponse, FilterChain
filterChain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) srequest;
//打印请求Url
System.out.println("this is MyFilter,url :" + request.getRequestURI());
filterChain.doFilter(srequest, sresponse);
}

@Override
public void init(FilterConfig arg0) throws ServletException {
}
}
}

有人好奇public FilterRegistrationBean testFilterRegistration() 这个方法返回的FilterRegistrationBean如何在Coltroller中获取？，(●’◡’●)，我很好奇，，于是乎！搞了点事情

在Controller中获取刚才ConfigurationFilter中【registration.addInitParameter(“name”, “alue”);//添加默认参数】这个设置的参数。

在Controller中加入如下代码就能获取（刚才【testFilterRegistration()】方法加了注解@Bean，所以Spring容器中会有一个实例， @Autowired就理所应当的注入进来了。）

@Autowired
FilterRegistrationBean registration;

@GetMapping("/getname")
public Map<String, String> getName() {
Map<String, String> initParameters = registration.getInitParameters();
return initParameters;
}