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

<!-- 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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