How to get parameters from the URL with JSP

Question

In JSP how do I get parameters from the URL   For example I have a URL www somesite com Transaction List jsp accountID 5 I want to get the 5   Is there a request getAttribute   accountID    like there is for sessions or something similar

User · Answer

Use EL  JSP Expression Language       param accountID

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If I may add a comment here      lt c out value    param accountID   gt  lt  c out gt   doesn t work for me  it prints a 0    Instead  this works    lt c out value    param  accountID     gt  lt  c out gt

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page 1    Detail page 2    lt   String id   request getParameter  userid         now you can using id for sql query of hsql detail product

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request getParameter  accountID   is what you re looking for   This is part of the Java Servlet API   See http   java sun com j2ee sdk 1 3 techdocs api javax servlet ServletRequest html for more information

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www somesite com Transaction List jsp accountID 5  For this URL there is a method call request getParameter in java   if you want a number here cast into int  similarly for string value cast into string  so for your requirement   just copy past below line in page   int  accountId   int request getParameter  accountID      you can now call this value useing accountId in whole page    here accountId is name of parameter you can also get more than one parameters using this  but this not work  It will only work with GET method if you hit POST request then their will be an error    Hope this is helpful

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About the Implicit Objects of the Unified Expression Language  the Java EE 5 Tutorial writes      Implicit Objects      The JSP expression language defines a set of implicit objects          pageContext  The context for the JSP page  Provides access to various objects including          servletContext  The context for the JSP page   s servlet and any web components contained in the same application  See Accessing the Web Context    session  The session object for the client  See Maintaining Client State    request  The request triggering the execution of the JSP page  See Getting Information from Requests    response  The response returned by the JSP page  See Constructing Responses       In addition  several implicit objects are available that allow easy access to the following objects          param  Maps a request parameter name to a single value   paramValues  Maps a request parameter name to an array of values   header  Maps a request header name to a single value   headerValues  Maps a request header name to an array of values   cookie  Maps a cookie name to a single cookie   initParam  Maps a context initialization parameter name to a single value      Finally  there are objects that allow access to the various scoped variables described in Using Scope Objects          pageScope  Maps page-scoped variable names to their values   requestScope  Maps request-scoped variable names to their values   sessionScope  Maps session-scoped variable names to their values   applicationScope  Maps application-scoped variable names to their values         The interesting parts are in bold      So  to answer your question  you should be able to access it like this  using EL      param accountID    Or  using JSP Scriptlets  not recommended     lt       String accountId   request getParameter  accountID      gt

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example you wanted to delete the subject record with its subject id   RequestMapping value  subject setup delete  subjectid   method   RequestMethod GET  public ModelAndView delete  PathVariable int subjectid        subjectsDao delete subjectid       return new ModelAndView  redirect  subject setup        and the parameter will be used for input on your query   public int delete int subjectid        String sql    update tbl subject set isdeleted   1  where id     subjectid         return template update sql

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String accountID   request getParameter  accountID

User · Answer

In a GET request  the request parameters are taken from the query string  the data following the question mark on the URL   For example  the URL http   hostname com p1 v1 amp p2 v2 contains two request parameters - - p1 and p2  In a POST request  the request parameters are taken from both query string and the posted data which is encoded in the body of the request   This example demonstrates how to include the value of a request parameter in the generated output   Hello  lt b gt  lt    request getParameter  name     gt  lt  b gt     If the page was accessed with the URL   http   hostname com mywebapp mypage jsp name John Smith   the resulting output would be   Hello  lt b gt John Smith lt  b gt     If name is not specified on the query string  the output would be   Hello  lt b gt null lt  b gt     This example uses the value of a query parameter in a scriptlet    lt       if  request getParameter  name      null            out println  Please enter your name           else           out println  Hello  lt b gt   request  getParameter  name     lt  b gt              gt

[java] How to get parameters from the URL with JSP

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