HandlerInterceptor如何在springMVC中使用？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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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
public 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.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");
}看完上述内容，你们掌握HandlerInterceptor如何在springMVC中使用的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
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