前言：
小编带大家了解了，spring mvc 以及spring mvc的入门和配置spring mvc的环境以及对于静态子资源的处理。
一. 参数传递
1.前期准备工作（替换pom.xml中的部分依赖）
1.1将log4j替换成为slf4j(将打印语句替换成为日志文件输出结果)
<log4j2.version>2.9.1</log4j2.version> <log4j2.disruptor.version>3.2.0</log4j2.disruptor.version> <slf4j.version>1.7.13</slf4j.version>
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>${slf4j.version}</version> <scope>runtime</scope> </dependency> <!--核心log4j2jar包--> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>${log4j2.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>${log4j2.version}</version> </dependency> <!--用于与slf4j保持桥接--> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> <version>${log4j2.version}</version> </dependency> <!--web工程需要包含log4j-web，非web工程不需要--> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-web</artifactId> <version>${log4j2.version}</version> <scope>runtime</scope> </dependency> <!--需要使用log4j2的AsyncLogger需要包含disruptor--> <dependency> <groupId>com.lmax</groupId> <artifactId>disruptor</artifactId> <version>${log4j2.disruptor.version}</version> </dependency>
2.正式操作
1.基础传参
1.1创建方法，用于验证传参
package com.lz.web; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; /** * @author lz * @create 2023-09-05 14:42 */ @Controller @Slf4j @RequestMapping("/param") public class ParmController { @RequestMapping("/hello1 ") public String index(String bname,Integer bid){ log.info("简单类型参数：bname：{},bid:{}",bname,bid); return "index"; } }
1.2构建界面回显
<%-- Created by IntelliJ IDEA. User: lzzxq Date: 2023/9/5 Time: 14:44 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>刘兵最喜欢吃锅巴</h1> </body> </html>
1.3设置访问路径（localhost：8080/param/hello1?bname=狂飙&bid=2）
3.复杂类型
2.1创建方法用于验证
@RequestMapping("/hello2") public String hello2(Book book, HttpServletRequest request){ log.info("复杂类型参数：bname：{},bid:{}", request.getParameter("bname"), request.getParameter("bid")); log.info("复杂类型参数：book:{}", book.toString() ); return "index"; }
2.2设置访问路径（localhost：8080/param/hello2?bname=狂飙&bid=2）
4.RequestParam注解传递参数
3.1创建方法用于验证
@RequestMapping("/hello3") public String toHello3(@RequestParam Integer bid, @RequestParam(required = false,value = "price") Integer bookPrice, @RequestParam("bookName") String bname){ log.info(">>>> 使用@RequestParam注解传递参数：{},{},{}", bid,bname,bookPrice); return "index"; }
3.2设置访问路径（localhost：8080/param/hello3?bname=狂飙&bid=2）
5.路径传参
4.1创建方法用于验证
@RequestMapping("/hello4/{bid}") public String hello4(@PathVariable("bid") Integer bid){ log.info("简单类型参数：bid:{}",bid); return "index"; }
4.2设置访问路径（localhost：8080/param/hello4/2）
6.RequestBody传参（专门用来接收json字符串）
6.1导入依赖
<jackson.version>2.9.3</jackson.version>
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>${jackson.version}</version> </dependency>
6.2创建方法用于验证
@RequestMapping("/hello5") public String hello5(Map map){ log.info("@RequestBody：map:{}",map); return "index"; } @RequestMapping("/hello6") public String hello6(@RequestBody Map map){ log.info("@RequestBody：map:{}",map); return "index"; }
6.3通过aplikt测试
6.4补充
reqiuestmapper(不安全，不具备标识意义)+=GetMapping+DeleteMappin+PutMapping+PostMapping
//增加 @PostMapping public String type1(){ System.out.println("PostMapping"); return "index"; } //修改 @PutMapping public String type2(){ System.out.println("PutMapping"); return "index"; } //输出 @DeleteMapping public String type3(){ System.out.println("PutMapping"); return "index"; } @GetMapping public String type4 (){ System.out.println("PutMapping"); return "index"; }
7.@RequestHeader（获取请求头）
7.1创建方法用于验证
@RequestMapping("/hello7") public String hello6(@RequestHeader("jwt") String jwt){ log.info("@RequestBody：jwt:{}",jwt); return "index"; }
7.2设置访问路径（localhost：8080/param/hello7）
8.复合行
@RequestMapping("/hello8") public String hello8( Book book, @RequestBody Map map, @RequestHeader("jwt") String jwt){ log.info("@RequestBody：book:{}",book); log.info("@RequestBody：map:{}",map); log.info("@RequestBody：jwt:{}",jwt); return "index"; }
二.返回值
1.void型
@RequestMapping("/hello1") public void hello1(HttpServletResponse response){ Map<String,Object> map=new HashMap<>(); map.put("code",200); map.put("msg","成功添加"); try { ResponseUtil .writeJson(response,map); } catch (Exception e) { e.printStackTrace(); } }
2.String+model类型
@RequestMapping("/hello4") public String hello5(Model model, HttpServletRequest request){ model.addAttribute("currentName","永州鸭"); request.setAttribute("location","来自于道州的"); return "index"; }
3.ModelAndView
@RequestMapping("/hello5") public ModelAndView hello5(){ ModelAndView mv = new ModelAndView(); //填充模型数据 mv.addObject("sign","头脑灵范..."); mv.setViewName("index"); //逻辑视图名 return mv; }
三.页面跳转
转发（forward:path）和重定向（redirect:path）这两种跳转方式将会绕开视图解析器的前缀和后缀；还有就是如果是在同一controller中则不用使用"/"从根目录开始,而如果是在不同的controller则一定要从根目录开始。
path为请求处理方法名，而非逻辑视图名。
- 转发（地址栏不变）
@RequestMapping("/hello1") public String hello1(){ System.out.println("hell1"); return "forward:index"; }
它相当于“request.getRequestDispatcher("url").forward(request,response)”。使用转发，既可以转发到jsp， 也可以转发到其他的控制器方法。
- 重定向（地址栏改变）
@RequestMapping("/hello2") public String /hello2(){ System.out.println("/hello2"); return "redirect:index"; }
它相当于“response.sendRedirect(url)”。需要注意的是，如果重定向到jsp页面，则jsp页面不能写在WEB-INF目录中，否则无法找到。
