如何在Spring MVC中注册Servlet过滤器呢?

Spring MVC注册Servlet过滤器的实现思路

步骤1：
   编写一个Servlet过滤器
步骤2:
   web.xml中注册Servlet过滤器
    或 
   JavaConfig的方式注册Servlet过滤器

 
1. Servlet过滤器编写示例 

package com.java265.form.web;
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;
 
public class ErrorHandleFilter implements Filter {
 
	@Override
	public void destroy() {
		// ...
	}
 
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		//
	}
 
	@Override
	public void doFilter(ServletRequest request, 
               ServletResponse response, FilterChain chain)
		throws IOException, ServletException {
 
		try {
			chain.doFilter(request, response);
		} catch (Exception ex) {
			request.setAttribute("errorMessage", ex);
			request.getRequestDispatcher("/WEB-INF/views/jsp/error.jsp")
                               .forward(request, response);
		}
 
	}
 
}

//Spring XML
//在Spring MVC + XML配置中,可使用web.xml注册过滤器

web.xml
<filter>
		<filter-name>errorHandlerFilter</filter-name>
		<filter-class>com.java265.form.web.ErrorHandleFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>errorHandlerFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

//Spring JavaConfig
//在Spring MVC + JavaConfig
//不使用web.xml文件
//可使用初始化程序类注册过滤器
 
package com.java265.form.config.servlet3;
 
import javax.servlet.Filter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import com.java265.form.config.SpringRootConfig;
import com.java265.form.config.SpringWebConfig;
import com.java265.form.web.ErrorHandleFilter;
 
public class MyWebInitializer extends
		AbstractAnnotationConfigDispatcherServletInitializer {
 
	//...
 
	@Override
	protected Filter[] getServletFilters() {
		return new Filter[]{new ErrorHandleFilter()};
	}
}