In series (4), we introduced how to bind data with @ RequestParam. Next we will look at the usage of several other data binding annotations.
1. @ PathVariable is used to bind the URL template variable value. We have introduced the usage in series (3), which is not described here.
2. @ CookieValue is used to bind data in the Cookie. Next we will use the sessionId in the Cookie for testing:
Add cookiebind action in DataBindController. The Code is as follows:
//@CookieValue Test@RequestMapping(value="/cookiebind", method = {RequestMethod.GET})public String cookieBind(HttpServletRequest request, Model model, @CookieValue(value="JSESSIONID", defaultValue="") String jsessionId){ model.addAttribute("jsessionId", jsessionId); return "cookiebindresult";}
Add a cookiebindresult. jsp View to the views folder. The Code is as follows:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">Run the test:
// @ RequestHeader Test @ RequestMapping (value = "/requestheaderbind", method = {RequestMethod. GET}) public String requestHeaderBind (HttpServletRequest request, Model model, @ RequestHeader (value = "User-Agent", defaultValue = "") String userAgent) {model. addAttribute ("userAgent", userAgent); return "requestheaderbindresult ";}
Add a requestheaderbindresult. jsp View to the views folder. The Code is as follows:
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">Run the test:
@ RequestMapping (value = "/modelautobind", method = {RequestMethod. POST}) public String modelAutoBind (HttpServletRequest request, Model model, AccountModel accountModel) {model. addAttribute ("accountmodel", accountModel); return "modelautobindresult ";}
With the help of @ ModelAttribute, we can simply add data to the Model and modify the above Code:
@RequestMapping(value="/modelautobind", method = {RequestMethod.POST})public String modelAutoBind(HttpServletRequest request, @ModelAttribute("accountmodel") AccountModel accountModel){ return "modelautobindresult";}Run the test:
@ SessionAttributes (value = "sessionaccountmodel ")
Add usernamebind and passwordbind actions in DataBindController. The Code is as follows:
// @ SessionAttributes Test @ ModelAttribute ("sessionaccountmodel") public AccountModel initAccountModel () {return new AccountModel () ;}@ RequestMapping (value = "/usernamebind", method = {RequestMethod. GET}) public String userNameBind (Model model, AccountModel accountModel) {model. addAttribute ("sessionaccountmodel", new AccountModel (); return "usernamebind" ;}@ RequestMapping (value = "/usernamebind", method = {RequestMethod. POST}) public String userNameBindPost (@ ModelAttribute ("sessionaccountmodel") AccountModel accountModel) {// redirect to password binding test return "redirect: passwordbind ";} @ RequestMapping (value = "/passwordbind", method = {RequestMethod. GET}) public String passwordBind (@ ModelAttribute ("sessionaccountmodel") AccountModel accountModel) {return "passwordbind" ;}@ RequestMapping (value = "/passwordbind", method = {RequestMethod. POST}) public String passwordBindPost (@ ModelAttribute ("sessionaccountmodel") AccountModel accountModel, SessionStatus status) {// destroy the status of the object stored in @ SessionAttributes. setComplete (); // display the binding result return "sessionmodelbindresult ";}Because @ SessionAttributes is specified on the controller, the parameter for @ ModelAttribute ("xxx") annotation will directly find the object named "xxx" in @ SessionAttributes, if not found, call the @ ModelAttribute ("xxx") annotation method to return the object and save it to @ SessionAttributes (if not found and @ ModelAttribute ("xxx ") the annotation method will throw HttpSessionRequiredException ). After the execution, you can call SessionStatus. setComplete () to destroy the stored object in @ SessionAttributes (data in HttpSession is not cleared ).
Add the usernamebind. jsp, passwordbind. jsp, and sessionmodelbindresult. jsp views in the views folder as follows:
<% @ Page language = "java" contentType = "text/html; charset = UTF-8" pageEncoding = "UTF-8" %> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> <% @ taglib prefix = "form" uri = "http://www.springframework.org/tags/form" %><% @ Page language = "java" contentType = "text/html; charset = UTF-8" pageEncoding = "UTF-8" %> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> <% @ taglib prefix = "form" uri = "http://www.springframework.org/tags/form" %><% @ Page language = "java" contentType = "text/html; charset = UTF-8" pageEncoding = "UTF-8" %> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd">Run the test:
// @ RequestBody Test @ RequestMapping (value = "/requestbodybind", method = {RequestMethod. GET}) public String requestBodyBind (Model model) {model. addAttribute ("accountmodel", new AccountModel (); return "requestbodybind" ;}@ RequestMapping (value = "/requestbodybind", method = {RequestMethod. POST}) public @ ResponseBody AccountModel requestBodyBind (@ RequestBody AccountModel accountModel) {return accountModel ;}
Add the requestbodybind. jsp view in the views folder as follows:
<% @ Page language = "java" contentType = "text/html; charset = UTF-8" pageEncoding = "UTF-8" %> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> <% @ taglib prefix = "form" uri = "http://www.springframework.org/tags/form" %>Run the test:
The result is correct and the conversion is successful.
7. @ RequestPart: binds the "multipart/form-data" type data. Supports javax. servlet. http. Part file upload and supports type conversion. For details, see the official documentation:
Http://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/htmlsingle/#new-in-3.1-mvc-requestpart
Code download: http://pan.baidu.com/s/1hqqVLTa
The content of the data binding part ends here.
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