配置过滤器

过滤器类

import java.io.IOException;
import java.io.Writer;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.http.MediaType;

import com.alibaba.fastjson.JSON;

public class SJFilter implements Filter {
private final Log logger = LogFactory.getLog(this.getClass());

private static Map<String, SjjlInterceptionobject> allowUriMap = new HashMap<String, SjjlInterceptionobject>();

public SJFilter() {

}

public void destroy() {

}


// 正式内容从这里开始（需要做什么写什么，这里是顺便记录一下获取路径的方法）

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

 request.setCharacterEncoding("utf-8");

// 首先获取请求路径
HttpServletRequest request2 = (HttpServletRequest) request;
String uri = request2.getRequestURI();
……
// do Something后 allowUriMap里面是需要拦截的路径
//判断该请求是否是拦截对象
if (allowUriMap.containsKey(uri)) {

//是的话do Something

……

}

//执行该方法，回归到该执行的请求

chain.doFilter(request, response);

}


@Override
public void init(FilterConfig arg0) throws ServletException {


}

}

xml文件中的配置

   <filter>
<filter-name>SJFilter</filter-name>
<filter-class>com.test.SJFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SJFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>