SpringMVC中常用注解
- RequestParam
- RequestBody
- PathVaribale
- 先了解下REST 风格 URL
- RequestHeader
- CookieValue
- ModelAttribute
- 修饰的方法有返回值
- 修饰的方法没有返回值
- SessionAttribute
RequestParam
说明
代码示例
jsp代码:
<%--
Created by IntelliJ IDEA.
User: Keafmd
Date: 2021/1/25
Time: 10:48
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>常用注解</title>
</head>
<body>
<!-- requestParams 注解的使用 -->
<a href="anno/testRequestParam?name=keafmd">RequestParam</a><br/>
</body>
</html>
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控制器代码:
package com.Keafmd.controller;
import com.Keafmd.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.bind.support.SessionStatus;
import java.util.Date;
import java.util.Map;
/**
* Keafmd
*
* @ClassName: AnnoConteoller
* @Description: 注解的控制器
* @author: 牛哄哄的柯南
* @date: 2021-01-25 10:50
*/
@Controller
@RequestMapping("/anno")
public class AnnoConteoller {
/**
* requestParams 注解的使用
* @param username
* @return
*/
@RequestMapping("/testRequestParam")
public String testRequestParam(@RequestParam(value="name") String username){
// @RequestParam(value="name") 必须传name,required:请求参数中是否必须提供此参数,默认值是true,必须提供
// 获得当前类名
String clazz = Thread.currentThread().getStackTrace()[1].getClassName();
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+clazz+" - "+method);
System.out.println("username:"+username);
return "success";
}
}
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输出结果:
执行了:com.Keafmd.controller.AnnoConteoller - testRequestParam
username:keafmd
12
RequestBody
说明
代码示例
jsp代码:
<form action="anno/testRequestBody" method="post">
用户姓名:<input type="text" name="uname" /><br/>
用户年龄:<input type="text" name="age" /><br/>
用户生日:<input type="text" name="birthday" /><br/>
<input type="submit" value="提交">
</form>
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控制器代码:
/**
* 获取到请求体的内容 RequestBody
*/
@RequestMapping("/testRequestBody")
public String testRequestBody(@RequestBody String body){
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
System.out.println("body:"+body);
return "success";
}
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输出结果:
执行了: testRequestBody
body:uname=Keafmd&age=21&birthday=2000-01-01
12
PathVaribale
先了解下REST 风格 URL
说明
代码示例
jsp代码:
<a href="anno/testPathVariable/10">testPathVariable</a><br/>
1
控制器代码:
/**
* PathVariable
* @param id
* @return
*/
@RequestMapping("/testPathVariable/{sid}")
public String testPathVariable(@PathVariable(name="sid") String id){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
System.out.println("id:"+id);
return "success";
}
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输出结果:
执行了: testPathVariable
id:10
12
RequestHeader
说明
代码示例
jsp代码:
<a href="anno/testRequestHeader">testRequestHeader</a><br/>
1
控制器代码:
/**
* RequestHeader获取请求头的值 不常用
* @param head
* @return
*/
@RequestMapping("/testRequestHeader")
public String testRequestHeader(@RequestHeader(value = "Accept") String head){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
System.out.println("head:"+head);
return "success";
}
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输出结果:
执行了: testRequestHeader
head:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
12
CookieValue
说明
代码示例
jsp代码:
<a href="anno/testCookieValue">testCookValue</a><br/>
1
控制器代码:
/**
* CookieValue 不常用
* @param cookievalue
* @return
*/
@RequestMapping("/testCookieValue")
public String testCookieValue(@CookieValue(value = "JSESSIONID") String cookievalue){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
System.out.println("cookievalue:"+cookievalue);
return "success";
}
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输出结果:
执行了: testCookieValue
cookievalue:DCCFE2C1F975AC04D4F55973ADA5C89C
12
ModelAttribute
说明
代码示例
jsp代码:
<form action="anno/testModelAttribute" method="post">
用户姓名:<input type="text" name="uname" /><br/>
用户年龄:<input type="text" name="age" /><br/>
<input type="submit" value="提交">
</form>
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修饰的方法有返回值
控制器代码:
/**
* ModelAttribute
* @return
*/
@RequestMapping("/testModelAttribute")
public String testModelAttribute(User user){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
System.out.println(user);
return "success";
}
//有返回值
@ModelAttribute
public User showUser(String uname){
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
User user = new User();
user.setUname(uname);
user.setAge(20);
user.setBirthday(new Date());
return user;
}
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输出结果:
执行了: testModelAttribute
User{uname='牛哄哄的柯南', age=21, birthday=Mon Jan 25 19:34:46 CST 2021}
12
修饰的方法没有返回值
控制器代码:
/**
* ModelAttribute
* @return
*/
@RequestMapping("/testModelAttribute")
public String testModelAttribute(@ModelAttribute("abc")User user){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
System.out.println(user);
return "success";
}
//无返回值
@ModelAttribute
public void showUser(String uname, Map<String,User> map){
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
User user = new User();
user.setUname(uname);
user.setAge(20);
user.setBirthday(new Date());
map.put("abc",user);
}
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输出结果:
执行了: testModelAttribute
User{uname='牛哄哄的柯南', age=21, birthday=Mon Jan 25 19:32:20 CST 2021}
12
SessionAttribute
说明
代码示例
jsp代码:
<a href="anno/testSessionAttributes">存入SessionAttributes</a><br/>
<a href="anno/getSessionAttributes">获取SessionAttributes</a><br/>
<a href="anno/delSessionAttributes">清除SessionAttributes</a><br/>
123
控制器代码:
package com.Keafmd.controller;
import com.Keafmd.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.bind.support.SessionStatus;
import java.util.Date;
import java.util.Map;
/**
* Keafmd
*
* @ClassName: AnnoConteoller
* @Description: 注解的控制器
* @author: 牛哄哄的柯南
* @date: 2021-01-25 10:50
*/
@Controller
@RequestMapping("/anno")
@SessionAttributes(value = {"msg"}) //把msg=牛哄哄的柯南存到session域中
public class AnnoConteoller {
/**
* SessionAttributes注解,存入msg
* @return
*/
@RequestMapping("/testSessionAttributes")
public String testSessionAttributes(Model model){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
//底层会存到Request域中
model.addAttribute("msg","牛哄哄的柯南");
return "success";
}
/**
* 获取
* @param modelMap
* @return
*/
@RequestMapping("/getSessionAttributes")
public String getSessionAttributes(ModelMap modelMap){
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
//从session域中取出来
String msg = (String)modelMap.get("msg");
System.out.println(msg);
return "success";
}
/**
* 清除
* @param sessionStatus
* @return
*/
@RequestMapping("/delSessionAttributes")
public String delSessionAttributes(SessionStatus sessionStatus) {
// 获得当前方法名
String method = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println("执行了:"+" "+method);
//从session域中清除
sessionStatus.setComplete();
return "success";
}
}
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输出结果:
执行了: testSessionAttributes
执行了: getSessionAttributes
牛哄哄的柯南
执行了: delSessionAttributes
执行了: getSessionAttributes
null
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