二、springMVC之RequestMapping和繫結引數註解

阿新 • • 發佈：2022-03-10

一、概述：

配置方式：

同HelloWord的配置方式；

目錄結構：

@RequestMapping：

@RequestMapping除了可以使用請求URL對映請求外，還可以使用請求方法、請求引數及請求頭對映請求；

@RequestMapping的value、method、params及heads分別表示請求URL、請求方法、請求引數及請求頭的對映條件，他們之間的與的關係，聯合使用多個條件可讓請求對映更加精確化。

修飾類

關於@RequestMapping除了修飾方法，還可用來修飾類類定義處：提供初步的請求對映資訊。

方法定義處：提供進一步的分對映資訊。

類定義處標記的@RequestMapping 限定了處理器類可以

處理所有URI為/springmvc的請求，它相對於WEB容器部署的根路徑；

處理器類可以定義多個處理方法，處理來自/springmvc下的請求；

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 
 6 @RequestMapping("/springmvc")
 7 @Controller
 8 public class 
 RequestMappingTest {
 9     private static final String SUCCESS = "success";
10 
11     @RequestMapping("/testRequestMaping")
12     public String hello() {
13         System.out.println("testRequestMaping");
14         return SUCCESS;
15     }
16 }

index.jsp:

a標籤的herf 屬性為RequestMapping的類的修改和方法的修飾value的拼接；

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <a href="springmvc/testRequestMaping">hello</a>
11 </body>
12 </html>

success.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index頁面點選 hello 跳轉到 success.jsp頁面且控制檯列印：testRequestMaping；

使用method屬性來指定請求方式

RequestMapping(value="testMethod",method=RequestMethod.POST)：

value：指定URL
method：指定請求方式

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 import org.springframework.web.bind.annotation.RequestMethod;
 6 
 7 @RequestMapping("/springmvc")
 8 @Controller
 9 public class RequestMappingTest {
10     private static final String SUCCESS = "success";
11 
12     /**
13      * 
14      * 常用：使用method屬性來指定請求方式
15      * 
16      * @return
17      */
18     @RequestMapping(value = "/testMethod", method = RequestMethod.POST)
19     public String testMethod() {
20         System.out.println("testMethod");
21         return SUCCESS;
22     }
23 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <form action="/springmvc/testMethod" method="POST">
11         <input type="submit" value="post提交">
12     </form>
13 </body>
14 </html>

success:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index頁面點選post提交跳轉到 success.jsp頁面且控制檯列印：testMethod；

使用params來更加精確的對映請求

params={"username", "age!=10","!dept"}引數說明：

請求引數中必須包含 username,username有沒有值都沒有關係；
請求引數必須包含age且age不等於10 age有沒有都沒關係，
請求引數不能包含dept;

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 
 6 @RequestMapping("/springmvc")
 7 @Controller
 8 public class RequestMappingTest {
 9     private static final String SUCCESS = "success";
10 
11     /**
12      * 
13      * 瞭解；可以使用params和headers來更加精確的對映請求 params和headers支援簡單的表示式
14      * 
15      * @return
16      */
17     @RequestMapping(value = "/testParamsAndHeaders", params = { "username", "age!=10","!dept" })
18     public String testParamsAndHeaders() {
19         System.out.println("testParamsAndHeaders");
20         return SUCCESS;
21     }
22 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/testParamsAndHeaders?username=李秀明&age=10">testParamsAndHeaders_username_age10</a>
11     <br>
12     <a href="/springmvc/testParamsAndHeaders?username=李秀明&age=11">testParamsAndHeaders_username_age11</a>
13     <br>
14     <a href="/springmvc/testParamsAndHeaders?username=李秀明&age=11&gender=1">testParamsAndHeaders_username_age11_gender</a>
15     <br>
16     <a href="/springmvc/testParamsAndHeaders?age=11&gender=1">testParamsAndHeaders_age11_gender</a>
17     <br>
18 </body>
19 </html>

success:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp的頁面如下，

如果點選testParamsAndHeaders_username_age10，則顯示錯誤資訊；原因是age=10，而param中規定引數！=10；

如果點選testParamsAndHeaders_username_age11，則成功跳轉到success 且控制檯列印testParamsAndHeaders；

如果點選testParamsAndHeaders_username_age11_gender，則成功跳轉到success且控制檯列印testParamsAndHeaders；

如果點選testParamsAndHeaders_age11_gender，則顯示錯誤資訊；原因是沒有username，而param中規定引數中有username，所以引數中必須帶有username；

使用headers來更加精確的對映請求

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 
 6 @RequestMapping("/springmvc")
 7 @Controller
 8 public class RequestMappingTest {
 9     private static final String SUCCESS = "success";
10 
11     @RequestMapping(value = "/testHeaders", headers = { "Accept-Language=zh-CN,zh;q=0.9" })
12     public String testHeaders() {
13         System.out.println("testHeaders");
14         return SUCCESS;
15     }
16 
17     @RequestMapping(value = "/testHeaders/enus", headers = { "Accept-Language=en-US,zh;q=0.9" })
18     public String testHeadersEnus() {
19         System.out.println("testHeaders");
20         return SUCCESS;
21     }
22 }

index.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isErrorPage="true"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <a href="/springmvc/testHeaders">testHeaders</a>
    <br>
    <a href="/springmvc/testHeaders/enus">testHeaders_enus</a>
    <br>
</body>
</html>

success:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp 執行結果如下，當點選testHeaders ，跳轉到 success.jsp頁面且控制檯列印testHeaders,

點選testHeaders_enus 報錯，原因是 headers = { "Accept-Language=en-US,zh;q=0.9" }，與瀏覽器的Accept-Language不一致導致請求失敗；

@RequestMapping URL支援Ant風格的請求（萬用字元）

？：匹配檔名中的一個字元：
*：匹配檔名中的任意字元
**：匹配多層路徑；

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 
 6 @RequestMapping("/springmvc")
 7 @Controller
 8 public class RequestMappingTest {
 9     private static final String SUCCESS = "success";
10 
11     @RequestMapping("/testAntPath/*/abc/dd/**/end?")
12     public String testAnt() {
13         System.out.println("testAnt");
14         return SUCCESS;
15     }
16 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/testAntPath/test/abc/dd/test/test/end11">testAnt</a>
11 </body>
12 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp 的執行效果如下圖；點選testAnt，會出現錯誤，原因是/springmvc/testAntPath/test/abc/dd/test/test/end11 end11多了一個1，因為@RequestMapping("/testAntPath/*/abc/dd/**/end?") 且？匹配一個字元，這裡end11 多了一個字元；所以不成功；把end11改為end1 ，再點選testAnt，會跳轉到success 頁面，且控制檯列印：testAnt；

@PathVariable對映URL繫結的佔位符到目標方法的引數中：

@RequestMapping url中的佔位符，必須和@PathVariable中的值一致，@PathVariable中的值可以和引數值相同也可以不相同；

即 @RequestMapping("/testPathVariable/{id}/{name}")；中的{id} 必須與@PathVariable("id") String id ，中的@PathVariable("id") 值相同；與String id 可以相同或者不相同。

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.PathVariable;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 
 7 @RequestMapping("/springmvc")
 8 @Controller
 9 public class RequestMappingTest {
10     private static final String SUCCESS = "success";
11 
12     @RequestMapping("/testPathVariable/{id}/{name}")
13     public String testPathVariable(@PathVariable("id") String id, @PathVariable("name") String names) {
14         System.out.println("testPathVariable id:" + id + ",name:" + names);
15         return SUCCESS;
16     }
17 }

index.jsp:

a標籤中的佔位符必須數量必須和@RequestMapping("/testPathVariable/{id}/{name}")中的數量一致，否則報錯；

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/testPathVariable/aaa/bb">testPathVariable</a>
11 </body>
12 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp顯示如下；點選testPathVariable，跳轉到success頁面，同時控制檯列印 testPathVariable id:aaa,name:bb

REST( Representational State Transfer )

說明：

State Transfer 為 "狀態傳輸" 或 "狀態轉移 "，Representational 中文有人翻譯為"表徵"、"具象"，合起來就是 "表徵狀態傳輸" 或 "具象狀態傳輸" 或 "表述性狀態轉移"。可以理解為：（資源）表徵狀態傳輸；

資源：就是網路上的一個實體，換言之就是一個具體的資訊。（如圖片，文字。。。）可以用URI 指向它。URI為每一個資源識別符。
表徵：可以理解為資源的傳輸形式（文字可以用 txt;可以用HTML；可以用JSON）。
狀態轉換：HTTP協議無狀態；如果客戶需要操作伺服器，必須通過某種手段，讓伺服器發生狀態轉換。http協議裡面，4個表示操作的動詞，GET、POST、PUT、DELETE。對應著獲取、新增、修改、刪除。

示例：

'/order/1 http get' 得到ID=1的order
'/order http POST' 新增的order
'/order/1 http PUT' 更新ID=1的order
'/order/1 http DELETE' 刪除ID=1的order

例項驗證

為了實現put 和 delete的效果，web.xml中需要配置HiddenHttpMethodFilter ，可以把post請求轉為delete or put請求。

 1 <!-- 配置HiddenHttpMethodFilter :可以把post請求轉為delete or put請求 -->
 2 
 3     <filter>
 4         <filter-name>HiddenHttpMethodFilter</filter-name>
 5         <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
 6     </filter>
 7     <filter-mapping>
 8         <filter-name>HiddenHttpMethodFilter</filter-name>
 9         <url-pattern>/*</url-pattern>
10     </filter-mapping>

web.xml配置：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 4     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
 5     version="4.0">
 6     <display-name>HelloWorld</display-name>
 7     <!-- 配置DispatcherServlet(快捷鍵 alt +/) -->
 8     <servlet>
 9         <servlet-name>springDispatcherServlet</servlet-name>
10         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
11         <!-- 配置DispatcherServletd 一個初始化引數：配置springmvc配置檔案的位置和名稱 -->
12         <!-- 實際上也可以不通過 contextConfigLocation 來配置Springmvc的配置檔案，而是用預設的 即預設的配置檔案為 
13             /WEB-INF/<servlet-name>-servlet.xml 本專案預設位置配置檔案即為： /WEB-INF/springDispatcherServlet-servlet.xml -->
14         <init-param>
15             <param-name>contextConfigLocation</param-name>
16             <param-value>classpath:spring.xml</param-value>
17         </init-param>
18         <!-- 表示springDispatcherServlet在載入的時候被建立 -->
19         <load-on-startup>1</load-on-startup>
20     </servlet>
21 
22     <!-- Map all requests to the DispatcherServlet for handling -->
23     <servlet-mapping>
24         <servlet-name>springDispatcherServlet</servlet-name>
25         <url-pattern>/</url-pattern>
26     </servlet-mapping>
27 
28     <!-- 配置HiddenHttpMethodFilter :可以把post請求轉為delete or put請求 -->
29 
30     <filter>
31         <filter-name>HiddenHttpMethodFilter</filter-name>
32         <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
33     </filter>
34     <filter-mapping>
35         <filter-name>HiddenHttpMethodFilter</filter-name>
36         <url-pattern>/*</url-pattern>
37     </filter-mapping>
38 
39 </web-app>

View Code

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.PathVariable;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.bind.annotation.RequestMethod;
 7 
 8 @RequestMapping("/springmvc")
 9 @Controller
10 public class RequestMappingTest {
11     private static final String SUCCESS = "success";
12 
13     @RequestMapping(value = "/testRest/{id}", method = RequestMethod.PUT)
14     public String testRestput(@PathVariable("id") Integer id) {
15         System.out.println("testRest-put:" + id);
16         return SUCCESS;
17     }
18 
19     @RequestMapping(value = "/testRest/{id}", method = RequestMethod.DELETE)
20     public String testRestDelete(@PathVariable("id") Integer id) {
21         System.out.println("testRest-delete:" + id);
22         return SUCCESS;
23     }
24 
25     @RequestMapping(value = "/testRest", method = RequestMethod.POST)
26     public String testRestPost() {
27         System.out.println("testRest post");
28         return SUCCESS;
29     }
30 
31     @RequestMapping(value = "/testRest/{id}", method = RequestMethod.GET)
32     public String testRestGet(@PathVariable("id") Integer id) {
33         System.out.println("testRest-get:" + id);
34         return SUCCESS;
35     }
36 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/testRest/1">test rest get</a>
11     <br>
12     <form action="/springmvc/testRest" method="POST">
13         <input type="submit" value="test rest post">
14     </form>
15     <form action="/springmvc/testRest/1" method="POST">
16         <input type="hidden" name="_method" value="DELETE"> <input
17             type="submit" value="test rest delete">
18     </form>
19     <form action="/springmvc/testRest/1" method="POST">
20         <input type="hidden" name="_method" value="PUT"> <input
21             type="submit" value="test rest put">
22     </form>
23 </body>
24 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

執行結果：

index.jsp執行效果如下圖；

點選test rest get 跳轉到success頁面，同時控制檯列印testRest-get:1；

點選test rest post跳轉到success頁面，同時控制檯列印testRest post；

點選test rest delete跳轉到success頁面，同時控制檯列印testRest-delete:1

點選test rest put跳轉到success頁面，同時控制檯列印testRest-put:1；

繫結引數註解

使用@RequestParam繫結請求引數值：

在方法入參處使用@RequestParam 可以把請求引數傳遞給請求方法；

value：表示請求引數的引數名
required：是否必須，預設為true，請求引數中必須包含對應的引數，若不存在，將丟擲異常；
defaultvalue ：引數預設值

http://localhost:8080/springmvc/tesRestParam?username=%E6%9D%8E%E7%A7%80%E6%98%8E&age=12中的username必須和@RequestParam(value = "username") String username中的@RequestParam(value="username")的一樣；和String username 可以一樣也可以不一樣；

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 import org.springframework.web.bind.annotation.RequestParam;
 6 
 7 @RequestMapping("/springmvc")
 8 @Controller
 9 public class RequestMappingTest {
10     private static final String SUCCESS = "success";
11 
12     /**
13      * @RequestParam來對映請求引數 value：請求引數名 required ：是否必須 defaultvalue ：引數預設值
14      * @return
15      */
16     @RequestMapping("/tesRestParam")
17     public String tesRestParam(@RequestParam(value = "username") String username,
18             @RequestParam(value = "age", required = false, defaultValue = "0") int age) {
19         System.out.println("tesRestParam:username" + username + ".aget:" + age);
20         return SUCCESS;
21     }
22 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="false"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/tesRestParam?username=李秀明&age=12">tesRestParam_username&age</a>
11     <br>
12     <a href="/springmvc/tesRestParam?username=李秀明">tesRestParam_username</a>
13 </body>
14 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp 執行如下圖，點選tesRestParam_username&age 跳轉到success，且控制檯列印：tesRestParam:username李秀明.aget:12；點選tesRestParam_username 跳轉到successtesRestParam:username李秀明.aget:0

@RequestHeader繫結請求報頭屬性值

請求頭包含了若干個屬性，伺服器可據此貨值客戶端的資訊。通過@RequestHeader可將請求頭中的屬性值繫結到處理方法的入參中

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestHeader;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 
 7 @RequestMapping("/springmvc")
 8 @Controller
 9 public class RequestMappingTest {
10     private static final String SUCCESS = "success";
11 
12     /**
13      * 用來對映請求頭資訊；用法同@RequestParam
14      * 
15      * @return
16      */
17     @RequestMapping("/tesRestHeader")
18     public String tesRestHeader(@RequestHeader(value = "Accept-Language") String al) {
19         System.out.println("tesRestHeader" + al);
20         return SUCCESS;
21     }
22 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="false"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/tesRestHeader">tesRestHeader</a>
11     <br>
12 </body>
13 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：點選testRestHeader 跳轉到success頁面，且控制檯列印：tesRestHeaderzh-CN,zh;q=0.9

@CookieValue繫結請求報頭屬性值

通過@CookieValue可讓處理方法入參繫結某個Cookie值；用法同@RequestParam

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.CookieValue;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 
 7 @RequestMapping("/springmvc")
 8 @Controller
 9 public class RequestMappingTest {
10     private static final String SUCCESS = "success";
11 
12     /**
13      * @CookieValue對映一個cookie值；用法同@RequestParam
14      * 
15      * @return
16      */
17     @RequestMapping("/testCookieValue")
18     public String testCookieValue(@CookieValue(value = "JSESSIONID") String JSESSIONID) {
19         System.out.println("testCookieValue" + JSESSIONID);
20         return SUCCESS;
21     }
22 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="false"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/testCookieValue">testCookieValue</a>
11 </body>
12 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp執行結果如下圖；點選testCookieValue跳轉到success頁面，且控制檯列印testCookieValue6458E41FB8EEF62E6A52F7612D1936D7

使用POJO物件繫結請求引數值；

springMVC 會按照請求引數名和POJO屬性名進行自動匹配，自動為該物件填充屬性。支援級聯屬性。如dept.deptId、dept.address.tel。。。

新增兩個實體類User.java 和 address.java

User.java

 1 package entity;
 2 
 3 public class User {
 4     private String userName;
 5     private int age;
 6     private Address address;
 7 
 8     public String getUserName() {
 9         return userName;
10     }
11 
12     public void setUserName(String userName) {
13         this.userName = userName;
14     }
15 
16     public int getAge() {
17         return age;
18     }
19 
20     public void setAge(int age) {
21         this.age = age;
22     }
23 
24     public Address getAddress() {
25         return address;
26     }
27 
28     public void setAddress(Address address) {
29         this.address = address;
30     }
31 
32     @Override
33     public String toString() {
34         return "User [userName=" + userName + ", age=" + age + ", address=" + address + "]";
35     }
36 
37 }

View Code

address.java

 1 package entity;
 2 
 3 public class Address {
 4     private String province;
 5     private String city;
 6 
 7     public String getProvince() {
 8         return province;
 9     }
10 
11     public void setProvince(String province) {
12         this.province = province;
13     }
14 
15     public String getCity() {
16         return city;
17     }
18 
19     public void setCity(String city) {
20         this.city = city;
21     }
22 
23     @Override
24     public String toString() {
25         return "Address [province=" + province + ", city=" + city + "]";
26     }
27 
28 }

View Code

web.xml新增編碼配置，防止form表單提交控制檯列印亂碼：

該段程式碼配置在web.xml其他過濾器前面，否則無效；

參考解決方式：https://www.cnblogs.com/lixiuming521125/p/14697014.html#_label4

 1 <filter>
 2         <filter-name>CharacterEncodingFilter</filter-name>
 3         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
 4         <init-param>
 5             <param-name>encoding</param-name>
 6             <param-value>utf-8</param-value>
 7         </init-param>
 8     </filter>
 9     <filter-mapping>
10         <filter-name>CharacterEncodingFilter</filter-name>
11         <url-pattern>/*</url-pattern>
12     </filter-mapping>

完整內容：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 4     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
 5     version="4.0">
 6     <display-name>HelloWorld</display-name>
 7     <filter>
 8         <filter-name>CharacterEncodingFilter</filter-name>
 9         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
10         <init-param>
11             <param-name>encoding</param-name>
12             <param-value>utf-8</param-value>
13         </init-param>
14     </filter>
15     <filter-mapping>
16         <filter-name>CharacterEncodingFilter</filter-name>
17         <url-pattern>/*</url-pattern>
18     </filter-mapping>
19     <!-- 配置DispatcherServlet(快捷鍵 alt +/) -->
20     <servlet>
21         <servlet-name>springDispatcherServlet</servlet-name>
22         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
23         <!-- 配置DispatcherServletd 一個初始化引數：配置springmvc配置檔案的位置和名稱 -->
24         <!-- 實際上也可以不通過 contextConfigLocation 來配置Springmvc的配置檔案，而是用預設的 即預設的配置檔案為 
25             /WEB-INF/<servlet-name>-servlet.xml 本專案預設位置配置檔案即為： /WEB-INF/springDispatcherServlet-servlet.xml -->
26         <init-param>
27             <param-name>contextConfigLocation</param-name>
28             <param-value>classpath:spring.xml</param-value>
29         </init-param>
30         <!-- 表示springDispatcherServlet在載入的時候被建立 -->
31         <load-on-startup>1</load-on-startup>
32     </servlet>
33 
34     <!-- Map all requests to the DispatcherServlet for handling -->
35     <servlet-mapping>
36         <servlet-name>springDispatcherServlet</servlet-name>
37         <url-pattern>/</url-pattern>
38     </servlet-mapping>
39 
40     <!-- 配置HiddenHttpMethodFilter :可以把post請求轉為delete or put請求 -->
41 
42     <filter>
43         <filter-name>HiddenHttpMethodFilter</filter-name>
44         <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
45     </filter>
46     <filter-mapping>
47         <filter-name>HiddenHttpMethodFilter</filter-name>
48         <url-pattern>/*</url-pattern>
49     </filter-mapping>
50 
51 </web-app>

View Code

RequestMappingTest：

 1 package handler;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 
 6 import entity.User;
 7 
 8 @RequestMapping("/springmvc")
 9 @Controller
10 public class RequestMappingTest {
11     private static final String SUCCESS = "success";
12 
13     @RequestMapping("/testpojo")
14     public String testpojo(User user) {
15         System.out.println("testpojo" + user);
16         return SUCCESS;
17     }
18 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="false"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <form action="/springmvc/testpojo" method="POST">
11         使用者名稱:<input type="text" name="userName" /> <br> 
12         年齡：<input type="text" name="age" /> <br> 
13         城市：<input type="text"name="address.city" /> <br> 
14         省份：<input type="text" name="address.province" /> <br> 
15             <input type="submit" value='提交'>
16     </form>
17 </body>
18 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp 的執行結果如下圖，填寫下面資訊，點選提交，跳轉到 success頁面，且控制檯列印：

testpojoUser [userName=李秀明, age=18, address=Address [province=浙江, city=嘉興]]

servlet 原生的API作為目標方法的引數

具體支援以下型別

HttpServletRequest,
HttpServletResponse,
Writer,
java.security.Principal,
Locale
InputStream,
OutputStream,
Reader,
Writer

RequestMappingTest：

 1 package handler;
 2 
 3 import java.io.IOException;
 4 import java.io.Writer;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 import org.springframework.stereotype.Controller;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 
12 @RequestMapping("/springmvc")
13 @Controller
14 public class RequestMappingTest {
15 
16     @RequestMapping("/testServletAPI")
17     public void testServletAPI(HttpServletRequest request, HttpServletResponse response, Writer out)
18             throws IOException {
19         out.write("hello spring");
20     }
21 }

index.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="false"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10     <a href="/springmvc/testServletAPI">testServletAPI</a>
11 </body>
12 </html>

success.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8" isErrorPage="true"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 <h4>success</h4>
11 </body>
12 </html>

View Code

執行結果：

index.jsp執行效果如下；點選testServletAPI 會顯示hello spring ;

二、springMVC之RequestMapping和繫結引數註解

一、概述：

配置方式：

目錄結構：

@RequestMapping：

修飾類

使用method屬性來指定請求方式

使用params來更加精確的對映請求

使用headers來更加精確的對映請求

@RequestMapping URL支援Ant風格的請求（萬用字元）

@PathVariable對映URL繫結的佔位符到目標方法的引數中：

REST( Representational State Transfer )

說明：

例項驗證

繫結引數註解

使用@RequestParam繫結請求引數值：

@RequestHeader繫結請求報頭屬性值

@CookieValue繫結請求報頭屬性值

使用POJO物件繫結請求引數值；

servlet 原生的API作為目標方法的引數

二、springMVC之RequestMapping和繫結引數註解

三、SpringMVC--@PathVariable 對映 URL 繫結的佔位符

AngularJS 學習筆記（四）基本概念和用法之雙向資料繫結

SpringMVC之RequestMapping的對映和各個屬性

五、spingmvc之轉發和重定向 springmvc之helloworld

七、springMVC之返回JSON和靜態檔案訪問

前端開發系列053-基礎篇之動態響應和繫結

vue學習筆記之給元件繫結原生事件操作示例

Python GUI程式設計學習筆記之tkinter事件繫結操作詳解

WPF MVVM 模式下後臺事件在前臺的呼叫和繫結

7、SpringMVC之Ajax請求響應

Vue——radio、checkbox、select 標籤的雙向繫結

Apache解析和繫結域名

詳解JavaScript的this指向和繫結

SpringMVC 之 ModelAndView和ModelAttribute的使用

十二、Shell之for迴圈

二、redis中String和List兩種資料型別和應用場景

SpringMVC之RequestMapping執行過程（HandlerMapping篇）

SpringMVC之RequestMapping執行過程（HandlerAdapter篇）

Electron 自定義軟體頂部選單、右鍵選單以及繫結快捷鍵

二、springMVC之RequestMapping和繫結引數註解

一、概述：

配置方式：

目錄結構：

@RequestMapping：

修飾類

使用method屬性來指定請求方式

使用params來更加精確的對映請求

使用headers來更加精確的對映請求

@RequestMapping URL支援Ant風格的請求（萬用字元）

@PathVariable對映URL繫結的佔位符到目標方法的引數中：

REST( Representational State Transfer )

說明：

例項驗證

繫結引數註解

使用@RequestParam繫結請求引數值：

@RequestHeader繫結請求報頭屬性值

@CookieValue繫結請求報頭屬性值

使用POJO物件繫結請求引數值；

servlet 原生的API作為目標方法的引數

相關推薦