springmvc的使用

时间：2020-12-11 12:43:07 阅读：27 评论：0 收藏：0 [点我收藏+]

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标题

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
/*
 * 这是控制层
 */

@Controller
public class MyController {
     
    @RequestMapping(value="/hello",method=RequestMethod.GET)
    public ModelAndView hello(@RequestParam(name="id",required=false)Integer id){ //可以简化成 (int id)
        System.out.println(id);
        System.out.println("hello GET Spring");
        return new ModelAndView("/comm/hello");
    }
    
    @RequestMapping(value="/hello",method=RequestMethod.POST)
    public ModelAndView hello2(@RequestParam(name="title")String title){
        System.out.println(title);
        System.out.println("hello POST Spring");
        return new ModelAndView("/comm/hello");
    }
    
}

注解解释说明

@Controller 控制器普通类

@RequestMapping 路由 value = {""} -> 匹配多路路由一般映射唯一

@RequestMapping 　　路由　　　　 value = {""} -> 匹配多路路由一般映射唯一
　　　　　　　　　　　　　　　　　　method = "" -> RequestMethod.GET | RequestMethod.POST
　　　　　　　　　　　　　　　　　　注意:路由命名必须唯一 GET和POST可以共享
　　　　　　　　　　　　　　　　　　produces ={""} -> Ajax中文处理 "application/json;charset=utf-8"

@ResponseBody 异步请求返回数据 -> json串

@RequestParam 参数映射 name |value -> get映射 id=1001 | post 映射 <input name="id" />
required -> true 参数必须(默认) | false 参数省略
defaultValue -> 参数省略通过默认值填充
@ModelAttribute 模型映射初始化对象 -> 类对其进行反射对象属性注值 key->value作用域

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
    <context:component-scan base-package="com.uplooking.controller"></context:component-scan>
     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/WEB-INF"></property>
         <property name="suffix" value=".jsp"></property>
     </bean>
 </beans>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:set var="root" value="${pageContext.request.contextPath}"></c:set>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>index</title>
</head>
<body>
    <a href="${root}/hello">hello</a>
    <hr/>
    <form action="${root}/hello" method="post">
        <input type="text" name="title">
        <input type="submit" value="hello">
    </form>
    
</body>
</html>

hello.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>hello</title>
</head>
<body>
    springmvc我来了
</body>
</html>

运行结果：

技术图片