Spring MVC - Binding VO to a Form

Problema:
I have a VO and I wanted to populate it on my JSP and on my controller just process the VO already populated.

Solution:
@Controller @RequestMapping(value = "/loggers/*") public class LoggersConfigurationController extends BaseCustomController { private static final Logger log = Logger .getLogger(LoggersConfigurationController.class); @SuppressWarnings("unchecked") @RequestMapping(value = "configureLoggers.do", method = RequestMethod.GET) public String showScreen(HttpServletRequest request, HttpServletResponse response, ModelMap modelMap) { if (!this.isLoggedIn(request)) { return "redirect:/authentication/notLoggedIn.do"; } log.debug("Show Screen when RequestMethod.GET"); //By doing this I'm preparing my diabolic plan!!! LoggerVO loggerVO = new LoggerVO(); modelMap.put("LoggerVO", loggerVO); return "configuration/loggersConfiguration"; } @SuppressWarnings("unchecked") @RequestMapping(value = "configureLoggers.do", method = RequestMethod.POST) public String updateLogger( HttpServletRequest request, HttpServletResponse response, ModelMap modelMap, @ModelAttribute(value="LoggerVO") LoggerVO loggerVO) { if (!this.isLoggedIn(request)) { return "redirect:/authentication/notLoggedIn.do"; } log.debug("Update logger when RequestMethod.POST"); List<String> messages = new ArrayList<String>(); log.debug("@ModelAttribute="+loggerVO); LogUtils.getInstance().setLogger(loggerVO); messages.add(loggerVO.getName()+" updated successfully to "+loggerVO.getLevel()); modelMap.put("KEY_LIST_MESSAGES", messages); //return "configuration/loggersConfiguration"; return "index-tabbed"; } }
On my POST method I'll handle my VO already populated.
This entry will do 50% of the job @ModelAttribute(value="LoggerVO") LoggerVO loggerVO
On my JSP I'll map using spring's tag library <%@taglib prefix="spring" uri="http://www.springframework.org/tags" %> <%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <H2>Loggers Configuration</H2> <form:form id="loggersForm" name="loggersForm" modelAttribute="LoggerVO" commandName="LoggerVO" action="/${pageContext.servletContext.servletContextName}/loggers/configureLoggers.do" method="POST"> <table width="100%"> <tr> <td><label for="name">Logger Name</label></td> <td> <form:select path="name" items="${applicationScope.KEY_LIST_LOGGERS}" itemValue="name" itemLabel="name"/> </td> </tr> <tr> <td><label for="level">Level</label></td> <td> <form:select path="level" items="${applicationScope.KEY_LIST_LOG_LEVELS}"/> </td> </tr> </table> <p> <input type="submit" value="Update"> </p> <div style="visibility: hidden"> <form:select path="appenderVOs"/> </div> </form:form> <c:if test="${!empty requestScope.KEY_LIST_MESSAGES}"> <script>alert("${requestScope.KEY_LIST_MESSAGES}");</script> </c:if>
By doing this modelAttribute="LoggerVO" commandName="LoggerVO"
I'm matching what I have on my form and what I have on my Controller <form:form id="loggersForm" name="loggersForm" modelAttribute="LoggerVO" commandName="LoggerVO" action="/${pageContext.servletContext.servletContextName}/loggers/configureLoggers.do" method="POST">
I hope this will help you!
Salu2