摘要:很多时候我们都会去修改其他同事的bug,甚至是已经离职的同事的bug,有时候我们点击页面去不着到后台对应的是哪个controller,针对这个问题,其实我们可以通过sprngmvc的拦截器来拦击用户的请求从而知道页面请求的是哪个class的哪个方法,当然这些打印日志信息肯能并不适合放在生产环境,或者这个拦截器也是非必要的。。。。
第一步:注册拦截器
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<!-- 注册拦截器 -->
< mvc:interceptors >
< bean class = "com.project.base.interceptor.ControlInterceptor" />
</ mvc:interceptors >
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第二步:继承HandlerInterceptor ,实现拦截器
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package com.iflashbuy.limanman;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class ControlInterceptor implements HandlerInterceptor{
private Logger logger = LoggerFactory.getLogger(getClass());
/**
* 执行完控制器后调用,即离开时
*/
@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object arg2, Exception arg3)
throws Exception {
}
@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
throws Exception {
// TODO Auto-generated method stub
}
@Override
public Boolean preHandle(HttpServletRequest request, HttpServletResponse arg1, Object arg2) throws Exception {
int i = 1 ;
try {
@SuppressWarnings ( "unchecked" )
Map<String, Object> parmMap = request.getParameterMap();
Iterator<String> iter = parmMap.keySet().iterator();
while (iter.hasNext()) {
Object key = iter.next();
Object value = parmMap.get(key);
logger.info( "第" + i + "个param---->{}-{}" , key, value);
i = i + 1 ;
}
}
catch (Exception e) {
i = 1 ;
}
i = 1 ;
return true ;
}
}
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二、后台打印信息效果
三、拓展使用拦截器实现http基本认证
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/**
* 执行完控制器后调用,即离开时
*/
@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object arg2, Exception arg3)
throws Exception {
logger.info( "className--->" + arg2);
logger.info( "request--->" + request);
}
@Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object arg2, ModelAndView arg3)
throws Exception {
}
@Override
public Boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object arg2) throws Exception {
String sessionAuth = (String) request.getSession().getAttribute( "auth" );
if (sessionAuth != null ) {
System.out.println( "this is next step" );
nextStep(request, response);
} else {
if (!checkHeaderAuth(request, response)) {
response.setStatus( 401 );
response.setHeader( "Cache-Control" , "no-store" );
response.setDateHeader( "Expires" , 0 );
response.setHeader( "WWW-authenticate" , "Basic Realm=\"请输入管理员账号密码\"" );
return false ;
}
}
return true ;
}
private Boolean checkHeaderAuth(HttpServletRequest request,
HttpServletResponse response) throws IOException {
String auth = request.getHeader( "Authorization" );
System.out.println( "auth encoded in base64 is " + getFromBASE64(auth));
if ((auth != null ) && (auth.length() > 6 )) {
auth = auth.substring( 6 , auth.length());
String decodedAuth = getFromBASE64(auth);
System.out.println( "auth decoded from base64 is " + decodedAuth);
request.getSession().setAttribute( "auth" , decodedAuth);
return true ;
} else {
return false ;
}
}
private String getFromBASE64(String s) {
if (s == null )
return null ;
try {
byte [] encodeBase64 = Base64.encodeBase64(s.getBytes( "UTF-8" ));
return new String(encodeBase64);
}
catch (UnsupportedEncodingException e) {
return null ;
}
}
public void nextStep(HttpServletRequest request,
HttpServletResponse response) throws IOException {
System.out.println( "you can go to the controller" );
}
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总结
以上就是本文关于springMVC拦截器HandlerInterceptor用法代码示例的全部内容,希望对大家有所帮助。如有不足之处,欢迎留言指出。感谢朋友们对本站的支持!
原文链接:https://my.oschina.net/fengshuzi/blog/364397