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SSM入门—SpringMVC框架 SpringMVC概述Spring Web MVC 是一种基于Java的实现Web MVC设计模式的请求驱动类型的轻量级Web框架。MVC的设计模式M：model 模型业务模型 数据模型 实体，业务代码，数据代码V: View 视图用于渲染数据，显示给客户html jsp framemarkerC：Controller 控制器主要用于接受参数，处理请求，返回结果servlet controller控制器主要作用：接受参数请求处理：调用模型结果返回。大多为josn格式SpringMVC工作流程基于XML方式配置SpringMVC操作步骤导入Spring、SpringMVC依赖<!-- 引入spring的核心依赖--> <!--Maven会自动添加当前jar依赖的其他jar--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.1.9.RELEASE</version> </dependency> <!-- 引入spring-mvc的依赖--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.9.RELEASE</version> </dependency>...在web.xml文件中配置前端控制器<servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <!-- 加载spring的核心配置文件--> <param-value>classpath:spring_mvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <!-- /表示所有请求--> <url-pattern>/</url-pattern> </servlet-mapping> ...编写控制器一个加上注解的普通Java类@Controller @RequestMapping(value = "/helloController") //控制器 public class HelloController { @RequestMapping("/sayHello") public void sayHello(){ System.out.println("say hello"); } @RequestMapping("/sayHi") public void sayHi(){ System.out.println("say hi"); } } ...配置spring_mvc.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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- spring的功能 开启注解扫描--> <context:component-scan base-package="com.gxa.controller"></context:component-scan> <!-- 开启spring mvc的注解 --> <mvc:annotation-driven></mvc:annotation-driven> </beans> ...部署项目将项目部署在Tomcat上测试效果输入路径：localhost/helloContorlle/sayHleeo 参数处理基本数据类型：可以直接传参public void sayHello(int id,@RequestParam("test") String name){ System.out.println(id); System.out.println(name); System.out.println("say hello"); }...@RequestParam("test") 注解用于传递的参数名和方法的参数名不一致时2、dto对象：如果参数是一堆，会封装在对象中@RequestMapping("/add") // 将前端传过来的参数自动映射到实体中 //如果前端的是json格式对象 @RequestBody public void add(CompanyDTO companyDTO){ System.out.println("添加方法"); System.out.println(companyDTO); } ...要求：传过来的参数名与实体中的属性名一致，才可以自动映射resulful风格一杠一值简化了请求参数对比：get请求：/请求地址？id=1&name=adminresultful请求：/请求路径/1/admin在RequestMapping（"/请求的地址/{id}/{name}"）@Controller @RequestMapping("/restfulController") public class RestfulController { @RequestMapping("/test/{id}/{name}") public void test(@PathVariable("id") int id,@PathVariable("name") String name){ System.out.println("id:"+id); System.out.println("name:"+name); } } ...示例：http://localhost/restfulController/test/10/zhangsanid:10name:zhangsan日期格式：将前端传过来的参数（字符串）转换为日期对象@DateTimeFormat@DateTimeFormat 将前端传过来的参数(字符串)转换为日期对象 //将字符串转换为日期格式数据 @DateTimeFormat(pattern = "yyyy-MM-dd")...@JsonFormat@JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss",timezone = "GMT+8") //返回值中要将日期对象转换为字符串...扩展：Lombok插件简写实体对比：以前的实体：需要自己添加setter，getter，tostring等方法使用Lombok：只要加上@Data注解 就可以自动完成以上操作只需要在pom.xml中添加依赖：<dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.4</version> </dependency>...结果的返回前后端分离后，一般返回JSON格式数据步骤：引入依赖<!-- 引入json的依赖--> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.8</version> </dependency>...使用@ResponseBody //@ResponseBody 将结果转换为json格式//查询所有的公司列表 @RequestMapping("/list") @ResponseBody //@ResponseBody 将结果转换为json格式 public List<Company> showAllCompanies(){ //返回的是一个集合 要把这个集合转换为json的数据格式 List<Company> companies = new ArrayList<>(); Company company1 = new Company(); company1.setId(1); company1.setName("国信安"); company1.setLocation("云华路"); company1.setBuildDate("2009-10-01"); Company company2 = new Company(); company2.setId(2); company2.setName("华为"); company2.setLocation("郫县"); company2.setBuildDate("2000-10-01"); companies.add(company1); companies.add(company2); return companies; } ...{ "code":0, "msg":"查询成功", "count":100, "data":[ [{"id":1,"name":"国信安","location":"云华路","buildDate":"2009-10-01"}, {"id":2,"name":"华为","location":"郫县","buildDate":"2000-10-01"}] ] }...可以自己封装结果对象package com.gxa.util; import lombok.Data; import java.util.List; @Data public class ResutData { private int code; private String msg; private int count; private List data; public static ResutData success(String msg,int count,List data){ ResutData resutData = new ResutData(); resutData.code = 0; resutData.msg = msg; resutData.count = count; resutData.data = data; return resutData; } public static ResutData error(String msg){ ResutData resutData = new ResutData(); resutData.code = 1; resutData.msg = msg; return resutData; } } ...
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