基于注解的Spring MVC（所需jar包，web.xml配置，Spring文件配置，@Controller,@RequestMapping,@RequestParam,model填參，EL取值）

Posted 2020-09-18 ljbguanli

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了基于注解的Spring MVC（所需jar包，web.xml配置，Spring文件配置，@Controller,@RequestMapping,@RequestParam,model填參，EL取值）相关的知识，希望对你有一定的参考价值。

1、加入jar

技术分享

2、web.xml配置：

<?xml version="1.0" encoding="UTF-8"?

>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:springMVC.xml</param-value>
  </init-param>
</servlet>
<servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>/</url-pattern>
</servlet-mapping>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3、springMVC.xml配置

4、实体bean

package cn.itcast.springmvc.domain;

public class User {

private String name;
private String address;
private Integer age;
private String tel;

public String getName() {
return name;
}

public void setName(String name) {
System.out.println("正在通过setName方法注入name的值：" + name);
this.name = name;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

public Integer getAge() {
return age;
}

public void setAge(Integer age) {
this.age = age;
}

public String getTel() {
return tel;
}

public void setTel(String tel) {
this.tel = tel;
}

@Override
public String toString() {
return "{name:" + name + ",address:" + address + ",age:" + age
+ ",tel:" + tel + "}";
}

}

5、编写HomeController,代码例如以下：

package cn.itcast.springmvc.controller;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

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 cn.itcast.springmvc.domain.User;

/**
* @brief IAccountDao.java 学习Spring注解方式
* @attention
* @author 涂作权
* @date 2014-5-18
* @note begin modify null
*/
@Controller //加入注解
@RequestMapping(value = "/home") // 根路径。有些类似strut2的命名空间
public class HomeController {

/**
* 子路径，表示仅仅支持get提交
* @param req 能够通过传递HttpServletRequest的方式获得參数
* @param name 表示连接的地方有：XXX?name=
* @param u 假设url的？后面參数过多，要想获得參数。能够直接将这个參数写成User
* @param model :定义一个Map对象，能够通过这样的方式将之传递给jsp页面
*
* @attention url地址能够是：http://localhost:8081/SpringMVC_02/home/hello
*         ?name=toto&address=haidian&age=24&tel=136XXX
* 获得的參数为：正在运行hello方法 name:toto User: {name:toto,address:haidian,age:24,tel:136XXX}
* @return
*/
@RequestMapping(value="/hello",method=RequestMethod.GET)
public String hello(HttpServletRequest req,
   @RequestParam(value = "name")
   String name, User u, Map<String, Object> model) {
  //String name = req.getParameter("name");
  System.out.println("正在运行hello方法 name:" + name);
  System.out.println("User: " + u);
  //req.setAttribute("msg", "hello " + name);
  model.put("msg", "hello " + name);
  return "hello";//逻辑名
}

/**
* \brief 定义方法hi
*
* @return
* @attention url的地方通过/home/hi的方式訪问要想訪问的地址
* @author 涂作权
     * @date 2014-5-18
* @note begin modify by null
*/
@RequestMapping(value="/hi") //子路径
public String hi(){
  System.out.println("正在运行hi方法");
  return "hi"; //逻辑名
}
}

6、编写的hello.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<html>
<head>
<title> ‘hello.jsp‘</title>
</head>

<body>
${requestScope.msg}
</body>
</html>

以上是关于基于注解的Spring MVC（所需jar包，web.xml配置，Spring文件配置，@Controller,@RequestMapping,@RequestParam,model填參，EL取值）的主要内容，如果未能解决你的问题，请参考以下文章

Spring MVC系列：（11）返回JSON

Spring基于注解开发异常

Spring4.0学习笔记008——AOP的配置（基于注解）

spring AOP (包含基于注解和配置文件两种方式)

Spring MVC系列Spring MVC应用及ModelAndView(模型视图)