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This article mainly explains "how to pass parameters to the page by controller of java ssm framework". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "java ssm framework controller how to transfer parameters to the page" bar!

Controller of ssm passes parameters to the page using Map to pass parameters

Add a Map type parameter A to the controller's method. Give the put method of parameter A put the key value pair B, which can be obtained in the page.

1.java background code writing, put operation and application key-value pair

@ RequestMapping ("/ edit_form") public String editApplicationFormPage (Map map, HttpServletRequest request, String applicationId) {map.put ("operation", "edit"); Application application = applicationService .getApplicationById (applicationId); if (application.getSysBigIcon () = = null | | application.getSysBigIcon (). Equals (")) {application.setSysBigIcon (" / www/images/default.png ") } if (application.getSysIcon () = = null | | application.getSysIcon () .equals (")) {application.setSysIcon (" / www/images/default.png ");} if (application! = null) {map.put (" application ", application);} return" / frame/system/application/application_form ";}

two。 The page uses the key-value pair passed by the background

The method used is that the key-value pair is wrapped in ${}. For example: ${operation} and ${application.orgId}, ${operation} is the operation key-value pair that references the background map put, and ${application.orgId} is an object that references the application entity of the background map put.

Window.WWWROOT = "${ctx}"; window.DefaultOrgId = ""; window.Operation = "${operation}"; window.OrgId = "${application.orgId}"; window.TaskAppId = "${application.taskAppId}"; window.MenuType = "${application.menuType}"; ${operation eq 'add'?' Add': (operation eq 'edit'?' Edit': 'View')} the application system uses PrintWriter to pass parameters

Write something for PrintWriter. This content is returned to the page.

1. The compilation of backstage code

Add a PrintWrite type parameter writer to the controller's method and write the content using the writer.write () method. The page can return this content. The code is as follows:

RequestMapping ("/ add") public void add (HttpServletRequest request, HttpServletResponse response,MenuRight menuRight, PrintWriter writer) {try {Boolean result = menuRightService.addMenuRight (menuRight); writer.write ("{\" success\ ": true}");} catch (Exception e) {/ / TODO Auto-generated catch block e.printStackTrace () Writer.write ("{\" success\ ": false}");}

two。 The coding of the page

Success: the result in function (result) is the content of writer.write () returned by the background.

$.ajax ({type: 'POST', url: WWWROOT + "/ menuRight/add", data: dat, success: function (result) {if ($.parseJSON (result). Success = = true) {$(stId) .attr ("checked", true);} else {alert ("add license failed") $(stId) .attr ("checked", false);}); ssm framework gets the parameters passed on the page through @ RequestParam

Receive a parameter with the name age, which can be empty

@ RequestParam (value = "age", required = false)

Through @ PathVariable

Via @ RequestBody-not applicable to Get requests

1.@RequestBody receives a request body, @ RequestBody can only exist one, and receives all the request parameters-- all at once

two。 If you pass an object or array, you must first convert it to Json format\ or a pure string.

3.@RequestBody is not suitable for Get requests

Receive date type: @ DateTimeFormat\ @ JsonFormat

@ DateTimeFormat usage scenario: when the page directly passes the date format, use this annotation to receive it.

@ JsonFormat usage scenario: use this annotation to receive when a page passes a date format in Json format. Special note: the annotation name may be different using different Json packages.

How to use it:

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