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SpringMVC如何获取请求带来的各种信息 ||如果我们的请求参数是一个POJO（自定义参数类型）， SpringMVC会自动的为这个POJO进行赋值
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SpringMVC如何获取请求带来的各种信息 ||如果我们的请求参数是一个POJO（自定义参数类型）， SpringMVC会自动的为这个POJO进行赋值
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SpringMVC如何获取请求带来的各种信息
默认方式获取请求参数： 直接给方法入参上写一个和请求参数名相同的变量。这个变量就来接收请求参数的值；
带：有值，没带：null；
如果我们的请求参数是一个POJO，SpringMVC会自动的为这个POJO进行赋值
web.xml
<?xml version="1.0" encoding="UTF-8"?> <!--suppress ALL --> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"><display-name>4.SpringMVC_request</display-name><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list><!-- The front controller of this Spring Web application, responsible for handling all application requests --><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><!-- Map all requests to the DispatcherServlet for handling --><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping><!-- 配置一个字符编码的Filter；一定注意：字符编码filter一般都在其他Filter之前； --><filter><filter-name>CharacterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><!-- encoding：指定解决POST请求乱码 --><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><!-- forceEncoding:顺手解决响应乱码；response.setCharacterEncoding(this.encoding); --><param-name>forceEncoding</param-name> <param-value>true</param-value></init-param></filter><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- 支持Rest风格的Filter --><filter><filter-name>HiddenHttpMethodFilter</filter-name><filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class></filter><filter-mapping><filter-name>HiddenHttpMethodFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"><context:component-scan base-package="com.atguigu"></context:component-scan><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/pages/"></property><property name="suffix" value=".jsp"></property></bean> </beans>index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body><form action="book" method="post">书名:<input type="text" name="bookName"/><br/>作者:<input type="text" name="author"/><br/>价格:<input type="text" name="price"/><br/>库存:<input type="text" name="stock"/><br/>销量:<input type="text" name="sales"/><br/><hr/>省：<input type="text" name="address.province"/>市：<input type="text" name="address.city"/>街道:<input type="text" name="address.street"/><br/><input type="submit"/> </form></body> </html>Book.java
package com.atguigu.book;public class Book {private String bookName;private String author;private Double price;private Integer stock;private Integer sales;private Address address;public String getBookName() {return bookName;}public void setBookName(String bookName) {this.bookName = bookName;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public Double getPrice() {return price;}public void setPrice(Double price) {this.price = price;}public Integer getStock() {return stock;}public void setStock(Integer stock) {this.stock = stock;}public Integer getSales() {return sales;}public void setSales(Integer sales) {this.sales = sales;}public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}@Overridepublic String toString() {return "Book [bookName=" + bookName + ", author=" + author + ", price="+ price + ", stock=" + stock + ", sales=" + sales+ ", address=" + address + "]";}}Address.java
package com.atguigu.book;public class Address {private String province;private String city;private String street;public String getProvince() {return province;}public void setProvince(String province) {this.province = province;}public String getCity() {return city;}public void setCity(String city) {this.city = city;}public String getStreet() {return street;}public void setStreet(String street) {this.street = street;}@Overridepublic String toString() {return "Address [province=" + province + ", city=" + city + ", street="+ street + "]";} }HelloController.java
package com.atguigu.controller;import java.io.BufferedReader; import java.io.IOException; import java.io.PrintWriter;import javax.servlet.ServletInputStream; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.CookieValue; import org.springframework.web.bind.annotation.RequestHeader; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam;import com.atguigu.book.Book;@Controller public class HelloController {@RequestMapping("/book")public String addBook(Book book){System.out.println("我要保存的图书："+book);return "success";}}《新程序员》：云原生和全面数字化实践50位技术专家共同创作，文字、视频、音频交互阅读
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