一、SpringMVC请求

依赖注入：

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
  4.   <modelVersion>4.0.0</modelVersion>  
  5.   <groupId>com.smiledog</groupId>  
  6.   <artifactId>springMVC_day01</artifactId>  
  7.   <version>1.0-SNAPSHOT</version>
  8.   <packaging>war</packaging>
  10.   <!--依赖管理-->
  11.   <dependencies> 
  12.     <!--springMVC-->  
  13.     <dependency> 
  14.       <groupId>org.springframework</groupId>  
  15.       <artifactId>spring-webmvc</artifactId>  
  16.       <version>5.1.5.RELEASE</version> 
  17.     </dependency>  
  18.     <!--servlet-->  
  19.     <dependency> 
  20.       <groupId>javax.servlet</groupId>  
  21.       <artifactId>servlet-api</artifactId>  
  22.       <version>2.5</version>  
  23.       <scope>provided</scope> 
  24.     </dependency>  
  25.     <!--jsp-->  
  26.     <dependency> 
  27.       <groupId>javax.servlet</groupId>  
  28.       <artifactId>jsp-api</artifactId>  
  29.       <version>2.0</version>  
  30.       <scope>provided</scope> 
  31.     </dependency>
  32.     <!-- 实体类注解依赖 -->
  33.     <dependency>
  34.       <groupId>org.projectlombok</groupId>
  35.       <artifactId>lombok</artifactId>
  36.       <version>1.16.8</version>
  37.       <scope>provided</scope>
  38.     </dependency>
  39.   </dependencies>
  41.   <build>
  42.     <plugins> 
  43.       <!-- 设置编译版本为1.8 -->  
  44.       <plugin> 
  45.         <groupId>org.apache.maven.plugins</groupId>  
  46.         <artifactId>maven-compiler-plugin</artifactId>  
  47.         <version>3.1</version>  
  48.         <configuration> 
  49.           <source>1.8</source>  
  50.           <target>1.8</target>  
  51.           <encoding>UTF-8</encoding> 
  52.         </configuration> 
  53.       </plugin> 
  54.     </plugins> 
  55.   </build> 
  56. </project>

spring-mvc：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.        xmlns:mvc="http://www.springframework.org/schema/mvc"
  5.        xmlns:context="http://www.springframework.org/schema/context"
  6.        xsi:schemaLocation="
  7.        http://www.springframework.org/schema/beans
  8.        http://www.springframework.org/schema/beans/spring-beans.xsd
  9.        http://www.springframework.org/schema/mvc
  10.        http://www.springframework.org/schema/mvc/spring-mvc.xsd
  11.        http://www.springframework.org/schema/context
  12.        http://www.springframework.org/schema/context/spring-context.xsd
  13.     ">
  14.     <!--开启注解组件扫描-->
  15.     <context:component-scan base-package="com.smiledog"/>
  17.     <!--开启mvc注解支持-->
  18.     <mvc:annotation-driven/>
  19.     <!--自定义视图解析器-->
  20.     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  21.         <property name="prefix" value="/jsp/"></property>
  22.         <property name="suffix" value=".jsp"></property>
  23.     </bean>
  24. </beans>

web.xml：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.     xmlns="http://java.sun.com/xml/ns/javaee"
  4.     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
  5.     version="2.5">
  7.     <!--前端控制器-->
  8.     <servlet>
  9.         <servlet-name>DispatcherServlet</servlet-name>
  10.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  11.         <!--加载指定配置文件-->
  12.         <init-param>
  13.             <param-name>contextConfigLocation</param-name>
  14.             <param-value>classpath:sprin-mvc.xml</param-value>
  15.         </init-param>
  16.         <!--指定servlet在tomcat启动时创建-->
  17.         <load-on-startup>4</load-on-startup>
  18.     </servlet>
  20.     <!--拦截url规则：/（默认）-->
  21.     <servlet-mapping>
  22.         <servlet-name>DispatcherServlet</servlet-name>
  23.         <url-pattern>/</url-pattern>
  24.     </servlet-mapping>
  26. </web-app>

1、简单类型

简单类型包括：基本类型，基本类型的包装类，字符串

  1. @RequestMapping("/param")
  2. @Controller
  3. public class SimpleParamController {
  4.     /*
  5.       简单类型
  6.      */
  7.     @RequestMapping("/simpleParam")
  8.     public String simplParam(String username,int age){
  9.         System.out.println(username);
  10.         System.out.println(age);
  11.         return "success" ;
  12.     }
  13. }
  14. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  15. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  16. <html>
  17.     <head>
  18.         <title>Title</title>
  19.     </head>
  20.     <body>
  21.         <a href="${pageContext.request.contextPath}/param/simpleParam?username=jack&age=15">
  22.             简单类型</a>
  23.     </body>
  24. </html>

2、对象类型

  1. @Data    //lombok依赖1.18.10
  2. @NoArgsConstructor
  3. @AllArgsConstructor
  4. public class User {
  5.     private String username;
  6.     private Integer age;
  7. }
  8. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  9. /*
  10.   对象类型
  11. */
  12. @RequestMapping("/objectParam")
  13. public String simplParam(User user){
  14.     System.out.println(user.getUsername());
  15.     System.out.println(user.getAge());
  16.     return "success" ;
  17. }
  18. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19. <html>
  20.     <head>
  21.         <title>Title</title>
  22.     </head>
  23.     <body>
  24.         <form action="${pageContext.request.contextPath}/param/objectParam">
  25.             姓名：
  26.             <input type="text" name="username" />  <br>
  27.             年龄：
  28.             <input type="text" name="age" >
  29. 表单中的name属性必须跟User类中的成员变量的名称一致，否则值将为null.
  30.             <input type="submit" value="提交">
  31.         </form>
  32.     </body>
  33. </html>

3、数组类型

  1. <form action="${pageContext.request.contextPath}/param/arrayParam">
  2.     <input type="checkbox" name="ids" value="1"> 矢泽优步老湿   <br>
  3.     <input type="checkbox" name="ids" value="2"> 樱井莉亚老湿   <br>
  4.     <input type="checkbox" name="ids" value="3"> 吉泽明步老湿   <br>
  5.     <input type="checkbox" name="ids" value="4"> 泷泽萝拉老湿   <br>
  6.     <input type="checkbox" name="ids" value="5"> 波多野结衣老湿 <br>
  7.     <input type="submit" value="数组类型">
  8. </form>
  9. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10. @RequestMapping("/arrayParam")
  11. public String simplParam(Integer[] ids){
  12.     System.out.println(Arrays.toString(ids));
  13.     return "success" ;
  14. }

4、集合类型

集合中存储User对象

  1. package com.smiledog.bean;
  3. import lombok.AllArgsConstructor;
  4. import lombok.Data;
  5. import lombok.NoArgsConstructor;
  7. import java.util.List;
  8. import java.util.Map;
  10. /**
  11.  * @author SmILeDog
  12.  **/
  13. @AllArgsConstructor
  14. @NoArgsConstructor
  15. @Data
  16. public class UserOv {
  17.     private String username;
  18.     private Integer age;
  19.     private List<User> userList;
  20.     private Map<String,User> userMap;
  21. }
  22. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23. <form action="${pageContext.request.contextPath}/helloWorld/jihe" method="get">
  24.     姓名: <input type="text" name="username">
  25.     年龄: <input type="text" name="age">  <br/>
  26.     user属性中的姓名:<input type="text" name="user.username"><br/>
  27.     user属性中的年龄:<input type="text" name="user.age">     <br/>
  28.     list中第一个user对象的年龄:<input type="text" name="userList[0].age">  <br/>
  29.     list中第一个user对象的姓名:<input type="text" name="userList[0].username"> <br/>
  30.     list中第二个user对象的年龄: <input type="text" name="userList[1].age"> <br/>
  31.     list中第二个user对象的姓名: <input type="text" name="userList[1].username"> <br/>
  32.     map中第一个键值对中值user对象的年龄: <input type="text" name="userMap['one'].age">  <br/>
  33.     map中第一个键值对中值user对象的姓名: <input type="text" name="userMap['one'].username"> <br/>
  34.     map中第二个键值对中值user对象的年龄: <input type="text" name="userMap['two'].age"> <br/>
  35.     map中第二个键值对中值user对象的姓名: <input type="text" name="userMap['two'].username"><br/>
  36.     <input type="submit" value="复杂类型">
  37. </form>
  38. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  39.     /**
  40.      * 集合类型
  41.      * 集合存储User对象
  42.      */
  43.     @RequestMapping("/jihe")
  44.     public String jihe(UserOv userOV) {
  45.         System.out.println("获取集合类型参数成功....");
  46.         System.out.println(userOV.getUsername());
  47.         System.out.println(userOV.getAge());
  48.         System.out.println(userOV.getUserList());
  49.         System.out.println(userOV.getUserMap());
  50.         // 转发到success.jsp页面
  51.         return "success";
  52.     }

对象中存储数组

二、解决中文乱码问题

如果是get请求，tomcat8以上版本的服务器统一了UTF-8编码，不会出现乱码
如果是post请求，由于servlet规范当中的post默认编码是ISO08859-1，就会乱码
web.xml文件添加以下代码

  1. <!--中文乱码过滤器-->
  2. <filter>
  3.     <filter-name>CharacterEncodingFilter</filter-name>
  4.     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  5.     <init-param>
  6.         <param-name>encoding</param-name>
  7.         <param-value>UTF-8</param-value>
  8.     </init-param>
  9. </filter>
  10. <filter-mapping>
  11.     <filter-name>CharacterEncodingFilter</filter-name>
  12.     <url-pattern>/*</url-pattern>
  13. </filter-mapping>

三、自定义类型转换器

用于时间格式的转换：前端输入的日期字符串，到后端要转换成Date类型数据

日期格式转换类：

  1. package com.smiledog.convert;
  2. import org.springframework.core.convert.converter.Converter;
  3. import java.text.SimpleDateFormat;
  4. import java.util.Date;
  6. /**
  7.  * 日期类型转换器
  8.  * @author SmILeDog
  9.  **/
  10. public class DateConverter implements Converter<String, Date> {
  11.     @Override
  12.     public Date convert(String dateStr) {
  13.         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
  14.         Date date = null;
  15.         try {
  16.             date = dateFormat.parse(dateStr);
  17.         } catch (Exception e) {
  18.             e.printStackTrace();
  19.         }
  20.         return date;
  21.     }
  22. }

xml编写：

  1. <!--开启mvc注解支持-->
  2.     <mvc:annotation-driven conversion-service="conversionService"/>
  3.     <!--  扩展自定义的类型转换器 -->
  4.     <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
  5.         <property name="converters">
  6.             <set>
  7.                 <bean class="com.smiledog.convert.DateConverter"></bean>
  8.             </set>
  9.         </property>
  10.     </bean>

测试：

  1. package com.smiledog.web;
  3. import org.springframework.stereotype.Controller;
  4. import org.springframework.web.bind.annotation.RequestMapping;
  6. import java.text.SimpleDateFormat;
  7. import java.util.Date;
  9. /**
  10.  * @author SmILeDog
  11.  **/
  12. @Controller
  13. public class DateTimeFormatTest {
  14.     /**
  15.      * 日期格式化注解版
  16.      * @param birthday 前端传过来的时间字符串
  17.      * @return
  19.     @RequestMapping("/getTime")
  20.     public String getTime(@DateTimeFormat(pattern ="yyyy-MM-dd")Date birthday){
  21.         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");
  22.         System.out.println(dateFormat.format(birthday));
  23.         return "success";
  24.     }*/
  25.     @RequestMapping("/getTime")
  26.     public String getTime(Date birthday){
  27.         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd");
  28.         System.out.println(dateFormat.format(birthday));
  29.         return "success";
  30.     }
  31. }

四、SpringMVC相关注解

@RequestParam

用于将指定的请求参数赋给方法中的形参，可以接收普通参数，也可以接收对象
常用于：数据查询时的分页操作
相关属性：value：请求参数名（必须）
required：表示是否必须，默认为true，请求该方法是必须携带参数和值
defaultValue：可设置请求参数的默认值

  1. @RequestParam(value="参数名",required="true/false",defaultValue=" ")
  1. <a href="/requestParam?pageNum=1&size=5">请求参数（分页）</a><br>
  1. @RequestMapping("requestParam")
  2. public String requestParam(
  3.     @RequestParam(value = "pageNum",defaultValue = "1")Integer pageNum,
  4.     @RequestParam(value = "size",defaultValue = "10")Integer size){
  5.     System.out.println("页码："+pageNum);
  6.     System.out.println("每页展示的数据："+size);
  7.     return "success";
  8. }

@RequestHeader

获取指定的请求头，相当于Servlet中的getHeader()方法

  1. <a href="${pageContext.request.contextPath}/requestHeader">请求头</a>
  1. @RequestMapping("/requestHeader")
  2. public String requestHeader(
  3.     @RequestHeader("User-Agent") String userAgent ,
  4.     @RequestHeader("cookie") String cookie){
  5.     System.out.println(userAgent);
  6.     System.out.println(cookie);
  7.     return "success" ;
  8. }

@CookieValue

获取指定Cookie的值

  1. <a href="${pageContext.request.contextPath}/cookieValue">获取指定的Cookie</a>
  1. @RequestMapping("/cookieValue")
  2. public String cookieValue( 
  3.     @CookieValue("JSESSIONID") String cookie){
  4.     System.out.println(cookie);
  5.     return "success" ;
  6. }