目录
在SpringBoot中使用使用过滤器有两种，一种是使用注解
@WebFilter，第二种是FilterRegistrationBean
@WebFilter实现
@WebFilter用于一个类声明过滤器，该注解将会在部署时被容器处理，容器将根据具体的属性将相应的类部署为过滤器
| 属性名 | 类型 | 描述 |
|---|---|---|
| filterName | String | 指定该Filter的名称 |
| urlPatterns | String | 指定该Filter所拦截的URL |
| value | String | 与urlPatterns一致 |
创建一个MyFilter.java 并且实现Filter接口
package net.auio.filter.filter;
import org.springframework.core.annotation.Order;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
@WebFilter(urlPatterns = "/api/*",filterName = "myFilter")
@Order(1) //指定过滤器的执行顺序，值越大越靠后执行
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println(this.getClass().getName()+"被初始化....");
}
@Override
public void destroy() {
System.out.println(this.getClass().getName()+"被销毁....");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest httpServletRequest =(HttpServletRequest) servletRequest;
String requestURI = httpServletRequest.getRequestURI();
String method = httpServletRequest.getMethod();
System.out.println("请求URL："+requestURI+"----请求方式："+method);
filterChain.doFilter(servletRequest, servletResponse);
}
}
启动类上加上@ServletComponentScan注解
package net.auio.filter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan
public class FilterApplication {
public static void main(String[] args) {
SpringApplication.run(FilterApplication.class, args);
}
}
创建一个FilterController接口
package net.auio.filter.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "/api")
public class TestController {
@GetMapping(value = "/user/filter")
public String hello(){
return "通过FIlter,QAQ~";
}
}
测试
FilterRegistrationBean 实现
创建MyFilerConfig
package net.auio.filter.config;
import net.auio.filter.filter.MyFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MyFilerConfig {
@Bean
public MyFilter myFilter(){
return new MyFilter();
}
@Bean
public FilterRegistrationBean filterRegistrationBean(MyFilter myFilter){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(myFilter);
filterRegistrationBean.setOrder(1);
filterRegistrationBean.addUrlPatterns("/api/*");
filterRegistrationBean.setName("myFilter");
return filterRegistrationBean;
}
}
修改MyFilter.java
删除注解，或者注释
//@WebFilter(urlPatterns = "/api/*",filterName = "myFilter")
//@Order(1) //指定过滤器的执行顺序，值越大越靠后执行
启动类删除@ServletComponentScan
package net.auio.filter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
public class FilterApplication {
public static void main(String[] args) {
SpringApplication.run(FilterApplication.class, args);
}
}
测试
过滤校验用户是否登录实战
修改application.properties加入开发接口通配地址
#凡是请求地址层级带有 open都放行
open.url=/**/open/**
修改myFilter
package net.auio.filter.filter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.annotation.Order;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.PathMatcher;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
//@WebFilter(urlPatterns = "/api/*",filterName = "myFilter")
//@Order(1) //指定过滤器的执行顺序，值越大越靠后执行
public class MyFilter implements Filter {
@Value("${open.url}")
private String openUrl;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println(this.getClass().getName()+"被初始化....");
}
@Override
public void destroy() {
System.out.println(this.getClass().getName()+"被销毁....");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest httpServletRequest =(HttpServletRequest) servletRequest;
String requestURI = httpServletRequest.getRequestURI();
String method = httpServletRequest.getMethod();
System.out.println("请求URL："+requestURI+"----请求方式："+method);
//判断是否开放性API
PathMatcher pathMatcher=new AntPathMatcher();
if (pathMatcher.match(openUrl,requestURI)){
filterChain.doFilter(servletRequest, servletResponse);
}else{
String token = httpServletRequest.getHeader("token");
if(StringUtils.isEmpty(token)){
servletRequest.getRequestDispatcher("/api/open/unLogin").forward(servletRequest, servletResponse);
}else{
filterChain.doFilter(servletRequest, servletResponse);
}
}
//判断是否携带凭证
filterChain.doFilter(servletRequest, servletResponse);
}
}
新增未登录接口，首页接口
package net.auio.filter.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "/api")
public class FilterController {
@GetMapping(value = "/user/filter")
public String hello(){
return "我被MYFILTER监视了";
}
@GetMapping(value = "/home/open/info")
public String getHome(){
return "欢迎访问首页";
}
@GetMapping(value = "/open/unLogin")
public String getUnLogin(){
return "登录失效，请重新登录！";
}
}
测试
访问未开放得接口
访问开放接口
携带TOKEN访问受保护得接口
