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SpringBoot注册FilterRegistrationBean
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。
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