目录
一、创建项目，pom文件
二、web.xml
三、spring-mvc.xml
四、index.jsp
五、实体类
Address类
User类
六、UserController类
七、请求参数解决中文乱码
八、配置tomcat,然后启动tomcat
1.
2.
3.
4.
九、接收Map类型
1.直接接收Map类型
（1）Get请求
第一种情况，什么注解也没有
第二种情况：传个值
第三种情况：声明是get请求
第四种情况:加@RequestParam
(2)post请求：
第一种情况：什么注解也没有
前端页面：加一个表单
第二种情况：声明是post请求
第三种情况：加上@RequestParam注解
表单和controller类中的方法改改(加个username)
第四种情况：加@RequestBody注解
2.用对象接收map
(1)User类里加一个map
(2)前端：
(3）运行：
十、在控制器中使用原生的ServletAPI对象
一、创建项目，pom文件
<?xml version="1.0" encoding="UTF-8"?><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"><modelVersion>4.0.0</modelVersion><groupId>com.qcby</groupId><artifactId>springMVC12</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><spring.version>5.0.2.RELEASE</spring.version></properties><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version><scope>provided</scope></dependency><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.0</version><scope>provided</scope></dependency></dependencies></project>二、web.xml
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"version="4.0"><!--前端控制器--><servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><!--配置启动加载--><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping></web-app>三、spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><!-- 配置spring创建容器时要扫描的包 --><context:component-scan base-package="com.qcby.controller"></context:component-scan><!-- 配置视图解析器 --><bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/pages/"></property><property name="suffix" value=".jsp"></property></bean><!-- 配置spring开启注解mvc的支持--><!-- <mvc:annotation-driven></mvc:annotation-driven>--></beans>四、index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>请求参数绑定</title></head><body><form action="user/save1.do" method="post">姓名：<input type="text" name="username" /><br/>年龄：<input type="text" name="age" /><br/><input type="submit" value="提交" /></form><h3>请求参数绑定（封装到实体类）</h3><form action="user/save2.do" method="post">姓名：<input type="text" name="username" /><br/>年龄：<input type="text" name="age" /><br/><input type="submit" value="提交" /></form><h3>请求参数绑定（封装到实体类）</h3><form action="user/save3.do" method="post">姓名：<input type="text" name="username" /><br/>年龄：<input type="text" name="age" /><br/>金额：<input type="text" name="address.money" /><br/><input type="submit" value="提交" /></form><h3>请求参数绑定（封装到实体类，存在list集合）</h3><form action="user/save4.do" method="post">姓名：<input type="text" name="username" /><br/>年龄：<input type="text" name="age" /><br/>金额：<input type="text" name="address.money" /><br/>集合：<input type="text" name="list[0].money" /><br/>集合：<input type="text" name="list[1].money" /><br/><input type="submit" value="提交" /></form></body></html>五、实体类
Address类
import java.io.Serializable;public class Address implements Serializable {private Double money;public Double getMoney() {return money;}public void setMoney(Double money) {this.money = money;}@Overridepublic String toString() {return "Address{" +"money=" + money +'}';}}User类
import java.io.Serializable;import java.util.List;public class User implements Serializable {private String username;private Integer age;// 引用对象private Address address;// list集合private List<Address> list;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}public List<Address> getList() {return list;}public void setList(List<Address> list) {this.list = list;}@Overridepublic String toString() {return "User{" +"username='" + username + '\'' +", age=" + age +", address=" + address +", list=" + list +'}';}}六、UserController类
import com.qcby.pojo.User;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controller@RequestMapping("/user")public class UserController {@RequestMapping("/save1.do")public String save(String username,Integer age){System.out.println("姓名:"+username);System.out.println("年龄:"+age);return "success";}@RequestMapping("/save2.do")public String save2(User user){System.out.println("user对象:"+user);return "success";}@RequestMapping("/save3.do")public String save3(User user){System.out.println("user对象:"+user);return "success";}@RequestMapping("/save4.do")public String save4(User user){System.out.println("user对象:"+user);return "success";}}七、请求参数解决中文乱码
<!-- 配置过滤器，解决中文乱码的问题 --><filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><!-- 指定字符集 --><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param></filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>现在的web.xml：<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"version="4.0"><!-- 配置过滤器，解决中文乱码的问题 --><filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><!-- 指定字符集 --><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param></filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!--前端控制器--><servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><!--配置启动加载--><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping></web-app>八、配置tomcat,然后启动tomcat
1.
2.
3.
4.
九、接收Map类型
1.直接接收Map类型
如果想直接接收前端传过来的map参数，应该使用两个注解(RequestBody或RequestParam；RequestParam--get和post请求都可以，RequestBody只能post请求，底层封装都是LinkedHashMap)
（1）Get请求
第一种情况，什么注解也没有
@RequestMapping("/mapSave1.do")public String mapSave1(Map<String, Objects> map){System.out.println("map:"+map);return "success";}
第二种情况：传个值
第三种情况：声明是get请求
@RequestMapping(value = "/mapSave1.do",method = RequestMethod.GET)public String mapSave1(Map<String, Objects> map){System.out.println("map:"+map);return "success";}
第四种情况:加@RequestParam
@RequestMapping(value = "/mapSave1.do")public String mapSave1(@RequestParam Map<String, Objects> map){System.out.println("map:"+map);return "success";}
所以，我传递一个map在后端接收，用get请求必须加@RequestParam注解
(2)post请求：
第一种情况：什么注解也没有
@RequestMapping(value = "/mapSave2.do")public String mapSave1(Map<String, Objects> map){System.out.println("map:"+map);return "success";}前端页面：加一个表单
<h3>请求参数的绑定--map集合</h3><form action="user/mapSave2.do" method="post">map集合key:<input type="text" name="map.key" /><br/>map集合value:<input type="text" name="map.value" /><br/><input type="submit" value="提交" /></form>
第二种情况：声明是post请求
@RequestMapping(value = "/mapSave2.do",method = RequestMethod.POST)public String mapSave2(Map<String, Objects> map){System.out.println("map:"+map);return "success";}
第三种情况：加上@RequestParam注解
@RequestMapping(value = "/mapSave2.do",method = RequestMethod.POST)public String mapSave2(@RequestParam Map<String, Objects> map){System.out.println("map:"+map);return "success";}
可以看出，get请求和post请求都可以用@RequestParam注解
表单和controller类中的方法改改(加个username)
<h3>请求参数的绑定--map集合</h3><form action="user/mapSave2.do" method="post">username:<input type="text" name="username"><br/>map集合:<input type="text" name="test1"><br/><%-- test1就是map的key，输入框中的就是map的value --%><input type="submit" value="提交" /></form>@RequestMapping(value = "/mapSave2.do")public String mapSave2(@RequestParam Map<String, Objects> map,String username){System.out.println("map:"+map);System.out.println("username:"+username);return "success";}
第四种情况：加@RequestBody注解
但是这样的话，它只能接收json数据
@RequestMapping(value = "/mapSave2.do")public String mapSave2(@RequestBody Map<String, Objects> map, String username){System.out.println("map:"+map);System.out.println("username:"+username);return "success";}
总结：无注解时，什么都接收不了；@RequestParam注解时，将参数包装成LinkedHashMap对象，参数的key是Map的key，参数的值是Map的value，get和
post请求都支持；@RequestBody注解接收json类型的数据(跟表单不一样，表单传不了)，也会包装成LinkedHashMap对象，该注解不支持get请求，get请求没有请求体，不能传json
2.用对象接收map
(1)User类里加一个map
private Map<String,Address> userMap;(2)前端：
<h3>请求参数绑定（封装到实体类，存在map集合）</h3><form action="user/save5.do" method="post">姓名：<input type="text" name="username" /><br/>年龄：<input type="text" name="age" /><br/>金额：<input type="text" name="address.money" /><br/>Map集合：<input type="text" name="userMap['one'].money" /><br/>Map集合：<input type="text" name="userMap['two'].money" /><br/><input type="submit" value="提交" /></form>(3）运行：
十、在控制器中使用原生的ServletAPI对象
只需要在控制器的方法参数定义HttpServletRequest和HttpServletResponse对象
UserController里加：
/*原生的API*/
@RequestMapping("/save6.do")
public String save6(HttpServletRequest request, HttpServletResponse response){System.out.println(request);// 获取到HttpSession对象HttpSession session = request.getSession();System.out.println(session);System.out.println(response);return "success";
}运行：
控制台：
