我要评论filter 过滤器是web开发中很重要的一个组件，下面以一个session登陆的例子介绍下spring boot中如何使用filter
首先要准备一个实现了filter的接口的类 sessionfilter：
import org.slf4j.loggerfactory;
import javax.servlet.*;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.httpsession;
import java.io.ioexception;
import java.util.arraylist;
import java.util.list;
import java.util.regex.matcher;
import java.util.regex.pattern;
/**
* created by mazhenhua on 2016/12/27.
*
* 过滤器
*/
public class sessionfilter implements filter {
private static final org.slf4j.logger logger = loggerfactory.getlogger(sessionfilter.class);
/**
* 封装，不需要过滤的list列表
*/
protected static list<pattern> patterns = new arraylist<pattern>();
@override
public void init(filterconfig filterconfig) throws servletexception {
}
@override
public void dofilter(servletrequest servletrequest, servletresponse servletresponse, filterchain chain) throws ioexception, servletexception {
httpservletrequest httprequest = (httpservletrequest) servletrequest;
httpservletresponse httpresponse = (httpservletresponse) servletresponse;
logger.info("aaaaaaaaaa");
string url = httprequest.getrequesturi().substring(httprequest.getcontextpath().length());
if (url.startswith("/") && url.length() > 1) {
url = url.substring(1);
}
if (isinclude(url)){
chain.dofilter(httprequest, httpresponse);
return;
} else {
httpsession session = httprequest.getsession();
if (session.getattribute("") != null){
// session存在
chain.dofilter(httprequest, httpresponse);
return;
} else {
// session不存在 准备跳转失败
/* requestdispatcher dispatcher = request.getrequestdispatcher(path);
dispatcher.forward(request, response);*/
chain.dofilter(httprequest, httpresponse);
return;
}
}
}
@override
public void destroy() {
}
/**
* 是否需要过滤
* @param url
* @return
*/
private boolean isinclude(string url) {
for (pattern pattern : patterns) {
matcher matcher = pattern.matcher(url);
if (matcher.matches()) {
return true;
}
}
return false;
}
}
实际开发中往往有很多请求要直接请求进来，不需要鉴权登陆的，所以代码中过滤掉这种请求的代码，装进list就好了。
/**
* 配置过滤器
* @return
*/
@bean
public filterregistrationbean somefilterregistration() {
filterregistrationbean registration = new filterregistrationbean();
registration.setfilter(sessionfilter());
registration.addurlpatterns("/*");
registration.addinitparameter("paramname", "paramvalue");
registration.setname("sessionfilter");
return registration;
}
/**
* 创建一个bean
* @return
*/
@bean(name = "sessionfilter")
public filter sessionfilter() {
return new sessionfilter();
}
经过上面这俩步的配置，过滤器基本上就可以了。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
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