Get the POST request body from HttpServletRequest

Question

I am trying to get the whole body from the HttpServletRequest object   The code I am following looks like this   if   request getMethod   equals  POST           StringBuffer sb   new StringBuffer        BufferedReader bufferedReader   null      String content            try             InputStream inputStream   request getInputStream              inputStream available              if  inputStream    null            bufferedReader    request getReader       new BufferedReader new InputStreamReader inputStream            char   charBuffer   new char 128           int bytesRead          while    bytesRead   bufferedReader read charBuffer      -1                 sb append charBuffer  0  bytesRead                         else                     sb append                         catch  IOException ex            throw ex        finally           if  bufferedReader    null                try                   bufferedReader close                  catch  IOException ex                    throw ex                                     test   sb toString        and I am testing the functionality with curl and wget as follows   curl --header  MD5  abcd  -F  fileupload  filename txt http   localhost 8080 abcd html   wget --header  MD5  abcd  --post-data    imei   351553012623446   hni   310150   wdp  false   http   localhost 8080 abcd html    But the while    bytesRead   bufferedReader read charBuffer      -1   does not return anything  and so I get nothing appended on StringBuffer

User · Answer

This works for both GET and POST       Context private HttpServletRequest httpRequest    private void printRequest HttpServletRequest httpRequest        System out println    n n Headers         Enumeration headerNames   httpRequest getHeaderNames        while headerNames hasMoreElements              String headerName    String headerNames nextElement            System out println headerName           httpRequest getHeader headerName               System out println   n nParameters         Enumeration params   httpRequest getParameterNames        while params hasMoreElements             String paramName    String params nextElement            System out println paramName           httpRequest getParameter paramName               System out println   n n Row data        System out println extractPostRequestBody httpRequest       static String extractPostRequestBody HttpServletRequest request        if   POST  equalsIgnoreCase request getMethod               Scanner s   null          try               s   new Scanner request getInputStream     UTF-8   useDelimiter    A              catch  IOException e                e printStackTrace                      return s hasNext     s next                   return

User · Answer

Easy way with commons-io   IOUtils toString request getReader       https   commons apache org proper commons-io javadocs api-2 5 org apache commons io IOUtils html

User · Answer

In Java 8  you can do it in a simpler and clean way    if   POST  equalsIgnoreCase request getMethod           test   request getReader   lines   collect Collectors joining System lineSeparator

User · Answer

This will work for all HTTP method    public class HttpRequestWrapper extends HttpServletRequestWrapper       private final String body       public HttpRequestWrapper HttpServletRequest request  throws IOException           super request           body   IOUtils toString request getReader                 Override     public ServletInputStream getInputStream   throws IOException           final ByteArrayInputStream byteArrayInputStream   new ByteArrayInputStream getBody   getBytes             ServletInputStream servletInputStream   new ServletInputStream                 public int read   throws IOException                   return byteArrayInputStream read                                Override             public boolean isFinished                     return false                              Override             public boolean isReady                     return false                              Override             public void setReadListener ReadListener listener                                      return servletInputStream             public String getBody             return this body

User · Answer

Be aware  that your code is quite noisy  I know the thread is old  but a lot of people will read it anyway  You could do the same thing using the guava library with       if   POST  equalsIgnoreCase request getMethod               test   CharStreams toString request getReader

User · Answer

If the request body is empty  then it simply means that it s already been consumed beforehand  For example  by a request getParameter    getParameterValues   or getParameterMap   call  Just remove the lines doing those calls from your code

User · Answer

If all you want is the POST request body  you could use a method like this   static String extractPostRequestBody HttpServletRequest request  throws IOException       if   POST  equalsIgnoreCase request getMethod               Scanner s   new Scanner request getInputStream     UTF-8   useDelimiter    A            return s hasNext     s next                   return         Credit to  https   stackoverflow com a 5445161 1389219

User · Answer

I resolved that situation in this way  I created a util method that return a object extracted from request body  using the readValue method of ObjectMapper that is capable of receiving a Reader    public static  lt T gt  T getBody ResourceRequest request  Class lt T gt  class        T objectFromBody   null      try           ObjectMapper objectMapper   new ObjectMapper            HttpServletRequest httpServletRequest   PortalUtil getHttpServletRequest request           objectFromBody   objectMapper readValue httpServletRequest getReader    class         catch  IOException ex            log error  Error message   ex             return objectFromBody

[java] Get the POST request body from HttpServletRequest

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