SpringBoot注册FilterRegistrationBean相关情况讲解
作者:愿做无知一猿 时间:2022-04-24 01:22:59
思路
首先编写程序时,或多或少会存在几个固定的Filter,那么第一步就是为确定的那几个Filter指定好顺序。(通常情况下的使用场景是:你要将你现在编写的项目打包成jar给别的项目使用)
其次程序确定的几个Filter已经编写好了,那么需要将它们和不确定的那几个放在一起进行重新排序。
将排好序的Filter进行注册。
补充:FilterRegistrationBean的使用
@Bean
FilterRegistrationBean<AFilter> filterRegistrationBean() {
FilterRegistrationBean<AFilter> filterRegistrationBean = new FilterRegistrationBean<>();
filterRegistrationBean.setFilter(new AFilter());
return filterRegistrationBean;
}
手动注册代码
先随便定义几个过滤器,后面备用
都一样的,我复制了几个:AFilter、BFilter、CFilter、DFilter、EFilter
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Arrays;
import java.util.Map;
public class AFilter implements Filter {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("A 的过滤器");
HttpServletRequest request = (HttpServletRequest) servletRequest;
Map<String, String[]> parameterMap = request.getParameterMap();
for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
System.err.println("AAAA----->>>>>> " + entry.getKey() + "----" + Arrays.toString(entry.getValue()));
}
filterChain.doFilter(servletRequest, servletResponse);
}
}
调试用的controller
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController {
@RequestMapping("/test")
public Object test() {
return "123";
}
}
已确定的过滤器注册类
import javax.servlet.Filter;
import java.util.HashMap;
import java.util.Map;
/**
* 已确定的过滤器排序
*/
public class InitFilterOrderRegistration {
private static final int INITIAL_ORDER = 200;
private static final int ORDER_STEP = 100;
private final Map<String, Integer> filterToOrder = new HashMap<>();
InitFilterOrderRegistration() {
Step order = new Step(INITIAL_ORDER, ORDER_STEP);
put(AFilter.class, order.next());
put(BFilter.class, order.next());
put(CFilter.class, order.next());
}
public Map<String, Integer> getOrderedFilterMap() {
return this.filterToOrder;
}
void put(Class<? extends Filter> filter, int position) {
String className = filter.getName();
if (this.filterToOrder.containsKey(className)) {
return;
}
this.filterToOrder.put(className, position);
}
Integer getOrder(Class<?> clazz) {
while (clazz != null) {
Integer result = this.filterToOrder.get(clazz.getName());
if (result != null) {
return result;
}
clazz = clazz.getSuperclass();
}
return null;
}
private static class Step {
private int value;
private final int stepSize;
Step(int initialValue, int stepSize) {
this.value = initialValue;
this.stepSize = stepSize;
}
int next() {
int value = this.value;
this.value += this.stepSize;
return value;
}
}
}
手动注册Filter的类
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.*;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.core.OrderComparator;
import org.springframework.core.Ordered;
import org.springframework.util.CollectionUtils;
import javax.servlet.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
public class DefaultFilterRegister implements BeanDefinitionRegistryPostProcessor {
private final List<OrderedFilter> filters = new ArrayList<>();
private final InitFilterOrderRegistration filterOrders = new InitFilterOrderRegistration();
private final List<Filter> toRegister = new ArrayList<>();
public DefaultFilterRegister performRegister() {
Map<String, Integer> orderedFilterMap = filterOrders.getOrderedFilterMap();
for (Map.Entry<String, Integer> entry : orderedFilterMap.entrySet()) {
try {
OrderedFilter orderedFilter = new OrderedFilter((Filter) Class.forName(entry.getKey()).newInstance(),
entry.getValue());
this.filters.add(orderedFilter);
} catch (Exception e) {
e.printStackTrace();
}
}
//排序并构造
this.filters.sort(OrderComparator.INSTANCE);
for (OrderedFilter filter : this.filters) {
toRegister.add(filter.filter);
}
return this;
}
public DefaultFilterRegister addFilterAfter(Filter filter, Class<? extends Filter> afterFilter) {
return addFilterAtOffsetOf(filter, 1, afterFilter);
}
public DefaultFilterRegister addFilterBefore(Filter filter, Class<? extends Filter> beforeFilter) {
return addFilterAtOffsetOf(filter, -1, beforeFilter);
}
private DefaultFilterRegister addFilterAtOffsetOf(Filter filter, int offset,
Class<? extends Filter> registeredFilter) {
int order = this.filterOrders.getOrder(registeredFilter) + offset;
this.filters.add(new OrderedFilter(filter, order));
return this;
}
@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
if (CollectionUtils.isEmpty(toRegister)) {
return;
}
for (Filter filter : toRegister) {
BeanDefinitionBuilder beanDefinitionBuilder =
BeanDefinitionBuilder.genericBeanDefinition(filter.getClass());
AbstractBeanDefinition beanDefinition = beanDefinitionBuilder.getBeanDefinition();
beanDefinition.setBeanClass(filter.getClass());
beanDefinition.setScope(BeanDefinition.SCOPE_SINGLETON);
registry.registerBeanDefinition(filter.getClass().getName(), beanDefinition);
}
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory bf) throws BeansException {
//可以通过这个BeanFactoryPostProcessor接口实现使某些过滤器失效的操作
DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) bf;
Arrays.stream(beanFactory.getBeanNamesForType(javax.servlet.Filter.class))
.forEach(name -> {
//例如让A失效
if (name.equals(AFilter.class.getTypeName())) {
BeanDefinition definition = BeanDefinitionBuilder
.genericBeanDefinition(FilterRegistrationBean.class)
.setScope(BeanDefinition.SCOPE_SINGLETON)
.addConstructorArgReference(name)
.addConstructorArgValue(new ServletRegistrationBean[]{})
.addPropertyValue("enabled", false)
.getBeanDefinition();
beanFactory.registerBeanDefinition(name + "FilterRegistrationBean",
definition);
}
});
}
private static final class OrderedFilter implements Ordered, Filter {
private final Filter filter;
private final int order;
private OrderedFilter(Filter filter, int order) {
this.filter = filter;
this.order = order;
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
this.filter.doFilter(servletRequest, servletResponse, filterChain);
}
@Override
public int getOrder() {
return this.order;
}
@Override
public String toString() {
return "OrderedFilter{" + "filter=" + this.filter + ", order=" + this.order + '}';
}
}
}
注意代码里的 postProcessBeanFactory 方法,我在里面使 A 过滤器失效。这应该是通用的,如果有其他的过滤器想失效的,一样操作即可。例如Spring Security中的一堆过滤器
将DefaultFilterRegister注册成Bean
import com.kusch.filter.AFilter;
import com.kusch.filter.CFilter;
import com.kusch.filter.DefaultFilterRegister;
import com.kusch.filter.custom.DFilter;
import com.kusch.filter.custom.EFilter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration(proxyBeanMethods = false)
public class OrderedConfiguration {
@Bean
@ConditionalOnMissingBean
DefaultFilterRegister defaultFilterRegister() {
//正常的话应该是: A(被失效) E B D C
DefaultFilterRegister defaultFilterRegister
= new DefaultFilterRegister()
.addFilterBefore(new DFilter(), CFilter.class)
.addFilterAfter(new EFilter(), AFilter.class);
return defaultFilterRegister.performRegister();
}
}
以上便是手动注册Filter的全部代码,同时,如果该项目被打成jar包给其他项目使用时,自定义DefaultFilterRegister这个Bean就可以实现在内置的过滤器前面或者后面增加新的过滤器。
来源:https://blog.csdn.net/qq_38397501/article/details/128706386
标签:SpringBoot,注册,FilterRegistrationBean
![](/images/zang.png)
![](/images/jiucuo.png)
猜你喜欢
java中如何判断JSONObject是否存在某个Key
2022-06-10 15:07:24
![](https://img.aspxhome.com/file/2023/8/119148_0s.png)
Spring Cloud Config 使用本地配置文件方式
2021-06-03 03:17:53
![](https://img.aspxhome.com/file/2023/5/62335_0s.png)
C# 中如何利用lambda实现委托事件的挂接
2022-02-06 03:18:00
C语言中求字符串长度的函数的几种实现方法
2023-07-04 23:29:05
Java IO流和文件操作实现过程解析
2022-03-10 02:08:13
Java 判断线程池所有任务是否执行完毕的操作
2021-10-03 09:43:55
C语言字符串函数入门
2021-07-22 17:10:15
spring boot结合Redis实现工具类的方法示例
2023-05-12 09:47:46
JAVA IDEA 打开assert 设置方式
2022-08-19 13:48:49
![](https://img.aspxhome.com/file/2023/7/77137_0s.png)
c# winform异步不卡界面的实现方法
2021-10-03 22:27:33
![](https://img.aspxhome.com/file/2023/7/108667_0s.png)
Spring如何基于aop实现事务控制
2021-07-21 11:26:06
c#通过xpath读取xml示例
2023-07-16 01:31:05
Android实现的数字格式化用法示例
2023-09-30 09:03:28
Spring mvc服务端数据校验实现流程详解
2023-02-06 16:37:14
Android控件之TabHost用法实例分析
2021-07-19 10:35:21
![](https://img.aspxhome.com/file/2023/9/122129_0s.png)
微信跳一跳辅助Java代码实现
2022-03-31 19:12:03
Java中的break和continue关键字的使用方法总结
2022-07-13 11:50:46
Android中使用ShareSDK集成分享功能的实例代码
2022-02-12 06:19:53
![](https://img.aspxhome.com/file/2023/5/91045_0s.png)
C# TrackBar拖动条改变滑块颜色
2021-12-22 22:11:07
![](https://img.aspxhome.com/file/2023/5/122695_0s.gif)
实例详解Android自定义ProgressDialog进度条对话框的实现
2023-02-18 08:32:40
![](https://img.aspxhome.com/file/2023/9/94999_0s.jpg)