最近在學(xué)習(xí)springmvc，今天把springmvc 參數(shù)綁定給整理一下，也算個學(xué)習(xí)筆記吧！
@RequestParam 綁定單個請求
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RequestMapping(value = "/form2") @ResponseBody public String form2(@RequestParam String name){ logger.info("name=" + name ); return ""; } |
@RequestParam 有required(是否必填),defaultValue(默認(rèn)參數(shù))參數(shù)
默認(rèn)required=true,defaultValue為空
如果name參數(shù)不存在則返回400
使用下面這種寫法則required默認(rèn)為false
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@RequestMapping(value = "/form") @ResponseBody public String form(String name, Integer age) { logger.info("name=" + name + "," + "age=" + age); return ""; } |
@RequestParam還支持?jǐn)?shù)組形式
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@RequestMapping(value = "/names") @ResponseBody public String names(@RequestParam String[] name) { logger.info("name=" + Arrays.asList(name)); return Arrays.asList(name).toString(); } |
對應(yīng)請求/names.do?name=張三,李四
或者/names.do?name=張三&name=李四
@PathVariable 綁定uri變量值
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@RequestMapping("/user/{id}") @ResponseBody public String getUser(@PathVariable Long id) { return String.valueOf(id); } |
請求/user/1返回id為1
@CookieValue 綁定cookie的值
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@RequestMapping("/getCookie") @ResponseBody public String getCookie(@CookieValue("JSESSIONID") String sessionId) { return sessionId; } |
@ModelAttribute綁定參數(shù)到命令對象
1、綁定請求參數(shù)到對象
先定義兩個對象
Role
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public class Role implements Serializable { private String id;} |
User
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public class User implements Serializable { private String id; private Role role;} |
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@RequestMapping("/getUserByModel") @ResponseBody public String getUserByModel(@ModelAttribute("user") User user) { logger.info(user.toString()); return ""; } |
對應(yīng)請求/getUserByModel.do?id=123&role.id=1
暴露表單引用對象為模型數(shù)據(jù)
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@ModelAttribute("user") public User getUser(String userId) { User user = new User(); user.setId("11"); Role role=new Role(); role.setId("123"); user.setRole(role); return user; } @RequestMapping("/getUserModel") @ResponseBody public String getUserModel(@ModelAttribute User user) { return user.toString(); } |
請求/getUserModel?id=1
返回 User{id='1', role=Role{id='123'}}
使用@ModelAttribute注釋的方法會在所有Controller方法前運行
因為先運行了@ModelAttribute注解的方法,生成了一個user對象,之后user對象的id屬性被修改為1
@SessionAttributes綁定命令對象到session
springmvc提供了@SessionAttributes用來對會話數(shù)據(jù)的存取
添加session
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@RequestMapping("/setSession") @ResponseBody public String setSession( HttpSession session) { City city = new City(); city.setCityName("shanghai"); session.setAttribute("city", city); return city.toString(); } |
獲取session數(shù)據(jù)
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//在類頭部添加需要的session屬性@Controller@SessionAttributes(value = {"city"})public class TestController { @RequestMapping("/getSession") @ResponseBody public String getSession(@ModelAttribute City city) { return city.toString(); }} |
清除本次會話session
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@RequestMapping("/clearSession") @ResponseBody public String clearSession(SessionStatus status) { status.setComplete(); return "success"; } |
@RequestBody綁定請求的內(nèi)容區(qū)數(shù)據(jù)并能進行自動類型轉(zhuǎn)換等
使用RequestBody可以將json轉(zhuǎn)化為對象
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@RequestMapping("/getUserByJson") @ResponseBody public String getUserByJson(@RequestBody User user){ return user.toString(); } |
發(fā)送json格式報文
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{ "id":"123"} |
返回結(jié)果User{id='123', role=null}
@RequestPart綁定“multipart/data”數(shù)據(jù)
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@RequestMapping("/getFile") @ResponseBody public String getFile(@RequestPart("image") MultipartFile file){ System.out.println(file.getName()+","+file.getSize()); return "success"; } |
源碼地址：springmvcLearn.rar
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://www.jianshu.com/p/28b6dd7ac157
