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springMVC拦截器HandlerInterceptor用法代码示例

2017-12-25 09:51 691 查看

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

<!-- 注册拦截器 -->
<mvc:interceptors>
<bean class="com.project.base.interceptor.ControlInterceptor" />
</mvc:interceptors>

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
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;
}
}

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.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");
}

总结

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