学习SpringMvc第二战之【SpringMVC之综合案例】

Dear 丶 2024-03-08 07:53 108阅读 0赞

**目录**

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)

2.正式操作

1.基础传参

1.1创建方法，用于验证传参

1.2构建界面回显

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

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

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

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

6.2创建方法用于验证

6.3通过aplikt测试

6.4补充

7.@RequestHeader（获取请求头）

7.1创建方法用于验证

7.2设置访问路径（localhost：8080/param/hello7）

8.复合行

二.返回值

1.void型

2.String+model类型

3.ModelAndView

三.页面跳转

--------------------

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>
    
    
    <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>
    
    <dependency>
    	<groupId>org.apache.logging.log4j</groupId>
    	<artifactId>log4j-slf4j-impl</artifactId>
    	<version>${log4j2.version}</version>
    </dependency>
    
    <dependency>
    	<groupId>org.apache.logging.log4j</groupId>
    	<artifactId>log4j-web</artifactId>
    	<version>${log4j2.version}</version>
    	<scope>runtime</scope>
    </dependency>
    
    
    <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） #####

![1f3780ec637e4d908271464a2912d177.png][]

### 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） ####

![611e4d8037bd49758707a2c387512442.png][]

### 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） ####

![8600958f825449a79cc430cd8175f92d.png][]

![b14fcc1bfbc0441198af3b79b83ce987.png][]

### 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） ####

![aed18662d9a94eccbcfc0163ef67c32a.png][]

### 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 ####

![f5bafc32c1a84541a19408d439bc2d0f.png][]

![05650f2b3b1a419484149ba53b9f97f1.png][]

#### 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";
        }

![525400b450ed4038bb2408edaa0bb357.png][]

### 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） ####

![b5acbf25822544bba647e201a40ae72b.png][]

### 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";
        }

![33ffb1d3043541619c5f4c4a5532d30c.png][]

## 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();
            }
        }

![2db0f1cce45b4fe4a0bbbd2ed47562bd.png][]

### 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";
    }

![04e64ea11f0c44aca5f008457c1f1d70.png][]

### 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;
        }

![63fc1feff2c94e0ea344d680d3988914.png][]

## 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。

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