How do I read the post data in a Spring Boot Controller?

Question

I would like to read POST data from a Spring Boot controller.

I have tried all the solutions given here: HttpServletRequest get JSON POST data, but I still am unable to read post data in a Spring Boot servlet.

My code is here:

package com.testmockmvc.testrequest.controller;

import org.apache.commons.io.IOUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@Controller
public class TestRequestController {

    @RequestMapping(path = "/testrequest")
    @ResponseBody
    public String testGetRequest(HttpServletRequest request) throws IOException {
        final byte[] requestContent;
        requestContent = IOUtils.toByteArray(request.getReader());
        return new String(requestContent, StandardCharsets.UTF_8);
    }
}

I have tried using the Collectors as an alternative, and that does not work either. What am I doing wrong?

I always get a zero length content. If I debug the code, I can see the post data in the servlet request object, but somehow it does not get read. — atul, Jan 19 '18 at 19:24
Clarification: This is for a post (not specifying the method allows both GET and POST) — atul, Jan 19 '18 at 19:30

score 8 · Accepted Answer · answered Jan 19 '18 at 19:26

8

First, you need to define the RequestMethod as POST. Second, you can define a @RequestBody annotation in the String parameter

@Controller
public class TestRequestController {

    @RequestMapping(path = "/testrequest", method = RequestMethod.POST)
    public String testGetRequest(@RequestBody String request) throws IOException {
        final byte[] requestContent;
        requestContent = IOUtils.toByteArray(request.getReader());
        return new String(requestContent, StandardCharsets.UTF_8);
    }
}

answered Jan 19 '18 at 19:26

fmodos

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Adding the "method=RequestMethod.POST" did not make any difference. I cannot add the "@ResponseBody" as an annotation to the parameter. I can only add it as an annotation to the method itself. – atul Jan 19 '18 at 19:29
I just adjusted the answer.. adding the RequestBody instead of ResponseBody annotation, my mistake. – fmodos Jan 19 '18 at 19:30
Quick update: I was using the same method for handling GET and POST requests, but adding the RequestBody annotation required me to have two different methods, one for GET and another for POST. – atul Jan 19 '18 at 22:11

How do I read the post data in a Spring Boot Controller?

1 Answers1