In Web application when request comes to the controllerthe HandlerMapping handler matches the incoming request. DispatcherServlet will hand it over to the handler mapping, to let it inspect the request and come up with an appropriate HandlerExecutionChain. Then the DispatcherServlet will execute the handler and interceptors in the chain.

When it comes to interceptors you can perform the your logic like logging, method tracking etc.

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For example, you could perform user authentication of a request before it reaches your controller and, if successful, retrieve some additional user details from a database adding them to the HttpServletRequest object before your controller is called. Your controller can then simply retrieve and use these values or leave them for display by the JSP. On the other hand, if the authentication fails, you could re-direct your user to a different page.

Quick Overview of Spring Interceptor: Each interceptor you define must implement org. HandlerInterceptor interface. There are three methods that need to be implemented. The preHandle. You can use this method to break or continue the processing of the execution chain. When this method returns true, the handler execution chain will continue; when it returns false, the DispatcherServlet assumes the interceptor itself has taken care of requests and, for example, rendered an appropriate view and does not continue executing the other interceptors and the actual handler in the execution chain.

These three methods should provide enough flexibility to do all kinds of preprocessing and postprocessing. Let us start with the complete application for interceptor. We will create a HelloWorldInterceptor that logs and tracks each coming requests. Software versions used to run the sample code:. This simply paints the hello.

Following is the content of another Spring Web configuration file sdnext-servlet. Once you are done with creating source and configuration files, export your application. Now start your Tomcat server and make sure you are able to access other web pages from web apps folder using a standard browser.

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development.

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He is currently working as a technology manager at a leading product and web development company. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it.

spring interceptor modify request body

He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list! In HelloWorldInterceptor. And also we configured this Interceptor at configuration file with following code of line.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

Since my service will only be accepting JSON requests, I would also like to dump the incoming request into a MongoDB collection for logging and, later, for data transformation. Only my tests with GET worked. It fails with POST. Therefore unchecked the accepted answer. Here is what happens:. I expected the HttpServletRequestWrapper to be taking care of caching the request.

But it doesn't happen somehow. Since the request body can only be read once, you'll need to extend the wrapper to access it so that your target controller can still access it later to deserialize your JSON into POJO objects. To access the requests in a central location, you can use either a Filter or a Spring Interceptor.

Both of these are invoked prior to the request being delegated to the controller, and both have access to the servlet. Here is an actual Logging example using a Spring Interceptor :.

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I doubt if HttpServletRequestWrapper can ever work Take a look at the DispatcherServlet implementation:. It passes reference to " processedRequest " still, which refers to a HttpServletRequest request whose stream has already been read. I know this is an old question, but for those of you that are still looking for a solution, this worked for me:. Then simply register the filter in web.Spring MVC allow you to intercept web request through handler interceptors.

The handler interceptor have to implement the HandlerInterceptor interface, which contains three methods :. In this tutorial, you will create two handler interceptors to show the use of the HandlerInterceptor.

Intercept before the controller execution, check if the current time is in between the maintenance time, if yes then redirect it to maintenance page; else continue the execution chain.

Thanks once again. Hi, will you tell me that how to do java class based configuration of Interceptor instead of XML based? I am facing issue of it. My whole application is class based configuration. I am using Spring boot. Handler interceptors example Intercept web request through handler interceptors.

Internationalization example Multiple languages […]. Great tutorial on HI, mkyong. Keep up the good work. Would be helpful. I want to use interceptor as SignInInterceptor or say Filter. I have defined same by extending HandlerInterceptorAdapter. Hi, I just downloaded the source codeimported it in eclipse, can you please tell me how to run itshould I call one of the jsp files or what?

So how should I set path so that my interceptor get invoked for all urls including context root path? Spring version 3. Welcome User Name: Password: package com. DateFormat; import java. Date; import java. Locale; import java. ResourceBundle; import javax. HttpServletRequest; import org.

Logger; import org. LoggerFactory; import org. Controller; import org. Model; import org. ModelAttribute; import org. RequestMapping; import org. RequestMethod; import com. Spring MVC handler interceptors example.

By mkyong July 30, Updated: August 29, Seldom use, cant find any use case. ExecuteTimeInterceptor — Intercept the web request, and log the controller execution time. MaintenanceInterceptor — Intercept the web request, check if the current time is in between the maintenance time, if yes then redirect it to maintenance page. Follow him on Twitter. If you like my tutorials, consider make a donation to these charities.

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Read all published posts by mkyong.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

spring interceptor modify request body

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It works fine, but now I need to modify all responses and add "status" and "message" fields to all of them. I've read about some solutions:. Can you suggest some other, general and correct solution, if I want to wrap values returned from controller methods into objects of class:.

Servlet Filters are Java classes that can be used in Servlet Programming to intercept requests from a client before they access a resource at back end or to manipulate responses from server before they are sent back to the client.

There is possibility to use any number of filters, and the order of execution will be the same as the order in which they are defined in the web. So, this filter gets the controller response, converts it into String, adds as feild to your RestResponse class object with status and message fieldsserializes it object into Json and sends the complete response to the client. The HTTP servlet response wrapper uses a custom servlet output stream that lets the wrapper manipulate the response data after the servlet is finished writing it out.

spring interceptor modify request body

Normally, this cannot be done after the servlet output stream has been closed essentially, after the servlet has committed it.

That is the reason for implementing a filter-specific extension to the ServletOutputStream class. To use the FilterServletOutputStream class should be implemented a class that can act as a response object. This wrapper object is sent back to the client in place of the original response generated by the servlet. If you use spring 4. Learn more. Asked 5 years, 8 months ago. Active 1 year, 2 months ago. Viewed 36k times. Vitalii Ivanov Vitalii Ivanov 1 1 gold badge 6 6 silver badges 18 18 bronze badges.

I don't know exact name of class, but there should exist response handler class in spring restful like ResponseHandler class in Wink implemenation of restful. You can set response entity explictily here after modifying the response.

It's probably best to rewrite the handlers. It's the most clean and less magical solution to your problem. Unfortunately it doesn't always pay of to be lazy.

You will need to rewrite the clients as well since they will receive data in the new format. In my opinion option 1 is the better approach to future proof your service. SergeBallesta Those questions you deem duplicates have nothing to do with this question.

Jimmy Thanks, now I am working on solutions with spring interceptors and servlet filters. Active Oldest Votes. I've encountered with similar problem and suggest you to use Servlet Filters to resolve it.

Your filter must implement the javax. Please, ask a questions, if something not clear and correct me if I'm wrong. Alexander Alexander 4 4 silver badges 13 13 bronze badges. Michal Foksa 5, 3 3 gold badges 29 29 silver badges 54 54 bronze badges.

This probably isn't the right answer.Recently I came through a requirement in which I have to read HttpServletRequest body twice and the pass the request again to filter chain for normal application flow. Then I created below given Java class which can used inside a servlet filter to intercept the request, read request body content and then pass the request again to servlet filter chain for further processing.

This is the sourcecode of custom implementation of HttpServletRequestWrapper class. Please note that I am using Servlets 2. Feel free to change the implementation as per latest servlet specification. Use wrapper to modify request parameters in servlet filter. It will help to servlet read request body twice.

In this servlet filter, you can read the http request body N number of times and then pass to filter chain and it will work just fine.

Spring Boot POST Request Example in REST API

You must be aware, by deafult, the http request body can be read only once. If you read the body in a filter, the target servlet will not be able to re-read it and this will also cause IllegalStateException. Essentially, request body content is cached inside wrapper object so it can be N number of times in complete request lifecycle. A family guy with fun loving nature. Love computers, programming and solving everyday problems. Find me on Facebook and Twitter. Hi, I used similar code for creating RequestWraper for our application to implement Req encryption on client side and decryption on server side.

But i facing the issue when i upload an image or zip files they are getting corrupted. If i stop using RequestWrapper which is newly introduced, Upload and download files are working fine. Thanks in advance.

Spring MVC Handler Interceptor

If I read data once, then I am not able to read it again. Can you please guide me on this?

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HttpRequest in RequestWrapper can not be applied to javax. I was hoping to use this to re-read bodies and send them as attachments when my error filter catches something. It will take a lot more code to get it to parse the bodies for parameters. Hi I trying same code on Web Sphere application server but it is not working. Once the request is read it when I chain the request values goes null there.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Since my service will only be accepting JSON requests, I would also like to dump the incoming request into a MongoDB collection for logging and, later, for data transformation. Only my tests with GET worked. It fails with POST. Therefore unchecked the accepted answer. Here is what happens:. I expected the HttpServletRequestWrapper to be taking care of caching the request.

But it doesn't happen somehow. Since the request body can only be read once, you'll need to extend the wrapper to access it so that your target controller can still access it later to deserialize your JSON into POJO objects. To access the requests in a central location, you can use either a Filter or a Spring Interceptor. Both of these are invoked prior to the request being delegated to the controller, and both have access to the servlet. Here is an actual Logging example using a Spring Interceptor :.

I doubt if HttpServletRequestWrapper can ever work Take a look at the DispatcherServlet implementation:. It passes reference to " processedRequest " still, which refers to a HttpServletRequest request whose stream has already been read.

I know this is an old question, but for those of you that are still looking for a solution, this worked for me:. Then simply register the filter in web. Can I define my own DispatcherServletand override doDispatch I make a Ouputstream version without any dependency to 3rd party libs for easier re-use. But anyway, I have to use a filter to do this instead of interceptor. Because as user mentioned, in spring 4, the processedRequest is used in both interceptor and handler, so you cannot use these methods for interceptor.

Also you can find some help in this link if you're using Writer version instead. Capture and log the response body. One simple way to do this would be to get the request body as String and then parse as a Java object. You can use this String then as you want.

In my experiences,just develop as follows: Using the filter in order to wrapper ServletRequest,then you can repeatly use getting request input stream. How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more.

spring interceptor modify request body

Asked 7 years, 11 months ago. Active 3 months ago. Viewed 68k times. I am a Spring newbie. So, kindly help me with directions to achieve this. Therefore unchecked the accepted answer The issue is, even if I create a HttpServletRequestWrapper, I cannot forward the request after I process and wrap the request. Anyway, the control flow does not reach this place.Just remember controller and handler are the same. If you are a beginner in Spring, to better understand interceptor, please go through the Spring 3 MVC tutorial.

In real scenario, Spring MVC handler interceptors are used for authentication, logging, to add a common message to all response. For the pages displayed we want to remove all bold tags from the response, it is possible using Spring interceptor.

Note: My opinion on the interceptor spring configuration is, it still follows the old XML based configuration type. It will be better if the annotation based configuration is also brought into this interceptor declaration as we are doing for the controllers.

HttpServletRequest; import javax. HttpServletResponse; import org. Component; import org. Controller; import org. Model; import org. RequestMapping; import org. RequestMethod; import org. List; import org. RequestMethod; import com. Animal; import com. Explained in a great way. I have one question over here can u tell me the functionality difference between the filter and interceptor? Thanks for writing the topic I requested.

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It is very easier to understand now. Example is nice. Thank you lot much. Filter is at very high level.

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It is generic. Handler interceptor has got options, once intercepted it has access to the controller handler object on which the intercept has happened. We can do request specific operations. Interceptor can be configured based on handler mappings. Filter is configured in web. Filter is more powerful, the request and response object that is passed on to the next level can be changed. Interceptor allows handler pre and post processing.

If you have a need to do something completely generic e.