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
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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;
}
}
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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