前端接受数据，并把数据显示到要转发到的页面。
两个配置文件：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">
<!--注册DispatcherServlet 本质就是一个servlet-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--加载springmvc-servlet.xml文件-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc-servlet.xml</param-value>
</init-param>
<!--配置web.xml文件的启动级别-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-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"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--扫描特定包下的注解-->
<context:component-scan base-package="com.zkw.restful"/>
<!--过滤静态资源-->
<mvc:default-servlet-handler/>
<!--mvc注解驱动-->
<mvc:annotation-driven/>
<!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
<!--前缀-->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!--后缀-->
<property name="suffix" value=".jsp"/>
</bean>
</beans>
先来一个pojo实体类User，这个主要是为了演示从前端接受回来对象
package com.zkw.pojo;
import lombok.*;
@Setter @Getter @AllArgsConstructor @NoArgsConstructor @ToString
public class User {
private int id ;
private String name;
private int age;
private String sex;
}
然后来一个Controller
@RequestParam("")这个注解和mybatis中的@Param注解差不多。
@RequestParam(“username”) String name 相当于把name起了一个别名叫做username，在前端请求用username
package com.zkw.restful;
import com.zkw.pojo.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
@RequestMapping("/user")
public class UserController {
@GetMapping("/t1")
public String test1(@RequestParam("username") String name, Model model){
// 1. 接受前端的数据
System.out.println("前端接受到的数据为："+name);
//2. 把接受的数据 返回给前端
model.addAttribute("msg",name);
return "hello";
}
//传递一个对象
//http://localhost:8080/user/t2?id=1&name=Tom&age=3&sex=%E7%94%B7
@GetMapping("/t2")
public String test2(User user,Model model){
System.out.println(user);
model.addAttribute("msg",user);
return "hello";
}
@GetMapping("/t3")
public String test3(@RequestParam("username") String name,ModelMap map){
map.addAttribute("msg",name);
System.out.println("前端的数据为："+name);
return "hello";
}
}
最后来一个jsp页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${msg}
</body>
</html>
结果为：
1、请求http://localhost:8080/user/t1?username=Tom结果为
2、请求http://localhost:8080/user/t2?id=1&name=Tom&age=3&sex=男 结果为
如果你的字段名写的和实体类不一致那么这个字段上的数据为null
3、请求http://localhost:8080/user/t3?username=Dog结果为
