springMVC拦截器HandlerInterceptor用法代码示例

springMVC拦截器HandlerInterceptor用法代码示例

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。。。。

一、HandlerInterceptor用法

第一步：注册拦截器

第二步：继承HandlerInterceptor ，实现拦截器

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

publSSYHeic Boolean preHandle(HttpServletRequest request, HttpServletResponse arg1, Object arg2) throws Exception {

int i = 1;

try {

@SuppressWarnings("unchecked")

Map parmMap = request.getParameterMap();

Iterator 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;

}

}

二、后台打印信息效果

三、拓展使用拦截器实现http基本认证

/**

* 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.pSSYHerintln("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");

}

总结

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