1.Filter简介
Filter称之为过滤器，是用来做一些拦截的任务。比如客户端请求服务器的某个资源时（可以是Servlet、JSP、HTML等等），我们可以拦截。当服务器返回资源给客户端的时候，我们也可以拦截。这样我们就可以在调用资源之前和之后分别加入一些业务逻辑。
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" 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当我们对某个资源加上多个过滤器的时候，就形成了过滤链。请求（request）会依次通过链上的过滤器，响应（response）会依次以相反的顺序通过过滤器。
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" alt="" />
2.Filter源码分析
Filter接口源代码：
public interface Filter {
void init(FilterConfig var1) throws ServletException;
void doFilter(ServletRequest var1, ServletResponse var2, FilterChain var3) throws IOException, ServletException;
void destroy();
}
2.1 FilterConfig
当容器去初始化一个filter的时候，就会根据web.xml文件的配置和当前的运行环境去构造一个FilterCongif实例并传给filter。所以一个filter对应一个FilterConfig实例。
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public interface FilterConfig {
String getFilterName();
ServletContext getServletContext();
String getInitParameter(String var1);
Enumeration getInitParameterNames();
}
getFilterName方法返回我们在web.xml里面配置的名称。
getServletContext返回ServletContext实例，这个和之前介绍Servlet的时候讲到的是一个东西。一个应用就一个ServletContext实例。
getInitParameter和getInitParameterNames和Servlet的类似。就是获取在web.xml里面配置的初始化参数。
2.2 FilterChain
FilterChain就是我们上面说的过滤链，当请求或响应被filter拦截时，容器提供FilterChain实例给filter让其使用。
public interface FilterChain {
void doFilter(ServletRequest var1, ServletResponse var2) throws IOException, ServletException;
}
FilterChain里面就一个方法doFilter，这个方法就是调用过滤链的下一个filter，如果当前filter是链中最后的一个，则跳转至请求的资源或返回响应给客户端。
2.3 Filter
Filter里面有三个方法，也是它的生命周期。
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" alt="" />
2.3.1 init
filter的初始化方法，跟servlet一样在其生命周期内只会被执行一次。但是filter初始化的时机和servlet不一样，当servlet容器（比如Tomcat）启动完成后就会检索web.xml里面配置的filter，从上往下依次回调每个filter的init方法对其进行初始化。（这里的filterConfig参数是容器构造并传入的。）
2.3.2 doFilter
实现拦截逻辑的地方，比如一个请求被拦截，这里可以在调用具体资源之前编写一些业务逻辑。然后调用chain.doFilter流转到后置filter，如果当前filter是链中最后的一个，则跳转至请求的资源。当chain.doFilter执行完成后，可以再写一些业务逻辑。然后容器将执行权流转到前置filter，如果当前filter是链中最前的一个，则将响应返回给客户端。（这里的参数chain是容器构造并传入的。）
2.3.3 destory
和servlet的destroy方法同样的道理，当servlet容器关闭或需要更多内存的时候，会销毁filter。这个方法就使得servlet容器拥有回收资源的能力。
同样地，destroy方法在filter的生命周期中只会被调用一次。
3.Java编写Filter实例
Filter开发分为2步：
- 编写java类实现Filter接口，并实现其doFilter方法。
- 在web.xml 文件中使用<filter>和<filter-mapping>元素对编写的filter类进行注册，并设置它所能拦截的资源。
注意：web.xml 中的 filter-mapping 元素的顺序决定了 Web 容器应用过滤器到 Servlet 的顺序
Filter接口实现类：
package com.xzh; import java.io.IOException; import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse; /**
* Created by xiangzh on 2017/8/29.
*/
public class FilterDemo implements Filter { @Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("--------Filter初始化--------"); // 获取初始化参数
String site = filterConfig.getInitParameter("param");
System.out.println("参数测试: " + site);
} @Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("-----------方法执行前处理-----------");
// 把请求传回过滤链
filterChain.doFilter(servletRequest,servletResponse);
System.out.println("-----------方法执行后处理-----------");
} @Override
public void destroy() {
/* 在 Filter 实例被 Web 容器从服务移除之前调用 */
}
}
web.xml配置filter：
<filter>
<filter-name>FilterDemo</filter-name>
<filter-class>com.xzh.FilterDemo</filter-class>
<init-param>
<param-name>param</param-name>
<param-value>这是一个测试参数</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>FilterDemo</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
这里需要注意的是，filter可以对url进行过滤，也可以针对具体的servlet进行过滤，只需要制定servlet的名称，如：
<servlet>
<servlet-name>ServletDemo</servlet-name>
<servlet-class>com.xzh.ServletDemo</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>ServletDemo</servlet-name>
<url-pattern>/ServletDemo</url-pattern>
</servlet-mapping> <filter>
<filter-name>FilterDemo</filter-name>
<filter-class>com.xzh.FilterDemo</filter-class>
<init-param>
<param-name>param</param-name>
<param-value>这是一个测试参数111</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>FilterDemo</filter-name>
<servlet-name>ServletDemo</servlet-name>
</filter-mapping>
效果截图：
上例中，在web.xml中设置了参数，并在filter中获取。
结果中，init()方法初始化执行一次，doFilter()方法访问一次执行一次。
参考：