SpringMvc--综合案例

目录

1.SpringMvc的常用注解

2.参数传递

基础类型(String)

创建一个paramController类:

创建一个index.jsp

测试结果

复杂方式

[​编辑 测试结果](#编辑 测试结果)

@RequestParam

测试结果

@PathVariable

测试结果

@RequestBody

pom.xml依赖导入

输出结果

@RequestHeader

测试结果

3.返回值

void

测试结果

Map

测试结果

​编辑

String

测试结果

String+model

测试结果

ModelAndView

4.页面跳转

转发

测试结果

​编辑

重定向

测试结果


1.SpringMvc的常用注解

  1. @Controller:用于声明一个控制器类。

  2. @RequestMapping:用于映射请求 URL 到控制器类或处理方法上。

  3. @RequestParam:用于获取请求参数的值。

  4. @PathVariable:用于获取 URL 中的参数值。

  5. @ResponseBody:用于将返回值转化为 JSON 格式或其他格式的数据。

  6. @ModelAttribute:用于将请求参数绑定到模型对象上。

  7. @Valid:用于验证请求参数。

  8. @InitBinder:用于定义数据类型转换和格式化规则。

  9. @SessionAttributes:用于将模型对象存储到会话中。

  10. @ExceptionHandler:用于处理控制器方法中抛出的异常。

  11. @RequestMapping(value="", method=RequestMethod.GET) 用于处理 GET 请求。

  12. @RequestMapping(value="", method=RequestMethod.POST) 用于处理 POST 请求。

  13. @RequestMapping(value="", method=RequestMethod.PUT) 用于处理 PUT 请求。

  14. @RequestMapping(value="", method=RequestMethod.DELETE) 用于处理 DELETE 请求。

2.参数传递

基础类型(String)

java 复制代码
@RequestMapping("/hello1")
    public String toHello1(Integer bid,String bname){
        log.info(">>>> 基础类型+String传参:{},{}",bid,bname);
        return "index";
    }

创建一个paramController类:

java 复制代码
package com.zking.web;
 
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
 
/**
 * @author bin人
 * @site www.zking.com
 * @company xy集团
 * @create 2023-09-05-14:44
 */
@Slf4j
@Controller
@RequestMapping("/param")
public class ParamController {
    @RequestMapping("/hello1")
    public String index(String bname,Integer bid){
//        System.out.println("放下屠刀");
        log.info("简单类型参数:bname:{},bid:{}",bname,bid);
        return "index";
    }
}

创建一个index.jsp

java 复制代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>立地成佛</h1>
</body>
</html>

测试结果

复杂方式

测试结果

@RequestParam

(用了这个required=false必须要传参数,要不然进入不了方法)

测试结果

必须要传bname要不然会报错,也接受不到值

传了值之后就可以正常访问了

@PathVariable

java 复制代码
 @RequestMapping("/hello4/{bid}")
    public String hello4(@PathVariable("bid") Integer bid){
        log.info("@PathVariable:bid:{}",bid);
//      fail..error warning info debug
        return "index";
    }

测试结果

@RequestBody

java 复制代码
@RequestMapping("/hello5/{bid}")
    public String hello5(Map map){
        log.info("@RequestBody:map:{}",map);
//      fail..error warning info debug
        return "index";
    }
    @RequestMapping("/hello6/{bid}")
    public String hello6(@RequestBody Map map){
        log.info("@RequestBody:map:{}",map);
//      fail..error warning info debug
        return "index";
    }
复制代码
想要用这个注解就必须导入架包依赖

pom.xml依赖导入

java 复制代码
<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.zking</groupId>
  <artifactId>yxssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>yxssm Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>

    <!--添加jar包依赖-->
    <!--1.spring 5.0.2.RELEASE相关-->
    <spring.version>5.0.2.RELEASE</spring.version>
    <!--2.mybatis相关-->
    <mybatis.version>3.4.5</mybatis.version>
    <!--mysql-->
    <mysql.version>5.1.44</mysql.version>
    <!--pagehelper分页jar依赖-->
    <pagehelper.version>5.1.2</pagehelper.version>
    <!--mybatis与spring集成jar依赖-->
    <mybatis.spring.version>1.3.1</mybatis.spring.version>
    <!--3.dbcp2连接池相关 druid-->
    <commons.dbcp2.version>2.1.1</commons.dbcp2.version>
    <commons.pool2.version>2.4.3</commons.pool2.version>
    <!--4.log日志相关-->
    <log4j2.version>2.9.1</log4j2.version>
    <log4j2.disruptor.version>3.2.0</log4j2.disruptor.version>
    <slf4j.version>1.7.13</slf4j.version>

    <!--5.其他-->
    <junit.version>4.12</junit.version>
    <servlet.version>4.0.0</servlet.version>
    <lombok.version>1.18.2</lombok.version>

    <!-- jstl+standard -->
    <jstl.version>1.2</jstl.version>
    <standard.version>1.1.2</standard.version>
    <!-- spring -->
    <spring.version>5.0.2.RELEASE</spring.version>

    <jackson.version>2.9.3</jackson.version>
  </properties>


  <dependencies>
    <!--1.spring相关-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!--2.mybatis相关-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <!--pagehelper分页插件jar包依赖-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>${pagehelper.version}</version>
    </dependency>
    <!--mybatis与spring集成jar包依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis.spring.version}</version>
    </dependency>

    <!--3.dbcp2连接池相关-->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-dbcp2</artifactId>
      <version>${commons.dbcp2.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>commons-pool2</artifactId>
          <groupId>org.apache.commons</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
      <version>${commons.pool2.version}</version>
    </dependency>

    <!--4.log日志相关依赖-->

    <!-- log4j2日志相关依赖 -->
    <!-- log配置:Log4j2 + Slf4j -->
    <!-- slf4j核心包-->
    <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>${log4j2.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>slf4j-api</artifactId>
          <groupId>org.slf4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <!--web工程需要包含log4j-web,非web工程不需要-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>${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>


    <!--5.其他-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit.version}</version>
      <!--<scope>test</scope>-->
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>${lombok.version}</version>
      <scope>provided</scope>
    </dependency>

    <!-- spring mvc相关依赖 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>${standard.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${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>
  </dependencies>

  <build>
    <finalName>yxssm</finalName>

    <resources>
      <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>jdbc.properties</include>
          <include>*.xml</include>
        </includes>
      </resource>
    </resources>

      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>${maven.compiler.plugin.version}</version>
          <configuration>
            <source>${maven.compiler.source}</source>
            <target>${maven.compiler.target}</target>
            <encoding>${project.build.sourceEncoding}</encoding>
          </configuration>
        </plugin>
        <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.2</version>
          <dependencies>
            <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>${mysql.version}</version>
            </dependency>
          </dependencies>
          <configuration>
            <overwrite>true</overwrite>
          </configuration>
        </plugin>

        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
  </build>
</project>

在导入依赖后我们还需要postman或者apipost/eolink等工具发送请求数据。 因为浏览器发送不了JSON数据请求。所以我们需要安装Eolink等第三方工具进行测试。

安装好后,按照以下步骤把参数填写好,query参数是往域名链接添加属性,如下:

输出结果

请看录像

通过方法五跟方法六的对比,可得出@RequestBody适用于专门接受Json

@RequestHeader

java 复制代码
 @RequestMapping("/hello7")
    public String hello7(@RequestHeader("jwt") String jwt){
//        System.out.println("刘三金去拿奶茶喽。。。");
        log.info("@RequestHeader参数:jwt:{}",jwt);
//      fail..error warning info debug
        return "index";
    }
 
    @RequestMapping("/hello8")
    public String hello8(Book book,
            @RequestBody Map map,
            @RequestHeader("jwt") String jwt){
//        System.out.println("刘三金去拿奶茶喽。。。");
        log.info("Book:Book:{}",book.toString());
        log.info("@RequestBody参数:Map:{}",map);
        log.info("@RequestHeader参数:jwt:{}",jwt);
//      fail..error warning info debug
        return "index";
    }

测试结果

3.返回值

void

先写工具类:

java 复制代码
package com.zking.utils;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import com.fasterxml.jackson.databind.ObjectMapper;

public class ResponseUtil {

	public static void write(HttpServletResponse response,Object o)throws Exception{
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();
		out.println(o.toString());
		out.flush();
		out.close();
	}
	
	public static void writeJson(HttpServletResponse response,Object o)throws Exception{
		ObjectMapper om = new ObjectMapper();
//		om.writeValueAsString(o)代表了json串
		write(response, om.writeValueAsString(o));
	}
}
java 复制代码
package com.zking.web;

import com.zking.utils.ResponseUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * @author bing人
 * @site
 * @company xy集团
 * @create 2023-09-06 22:12
 */
@Controller
@RequestMapping("/rs")
public class ReturnController {
    @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();
        }

    }
}

测试结果

Map

java 复制代码
 @ResponseBody//响应json数据
    @RequestMapping("/hello2")
    public Map hello2(HttpServletResponse response) {
        Map<String, Object> map = new HashMap<>();
        map.put("code", 200);
        map.put("msg", "成功添加。");
        return  map;
    }

测试结果

String

java 复制代码
 @RequestMapping("/hello3")
    public String hello3() {
        return "index";
    }

测试结果

String+model

java 复制代码
 //String+model
    @RequestMapping("/hello4")
    public String hello4(Model model, HttpServletRequest request) {
        model.addAttribute("currentName","浏阳鞭炮");
        request.setAttribute("location","来自于刘老板的");
        return "index";
    }

测试结果

ModelAndView

4.页面跳转

转发

java 复制代码
// 场景一:转发到后台的某一个方法(当前类)
    @RequestMapping("/hello6")
    public String hello6(){
        System.out.println("hello6");
        return "forward:hello2";
    }

    // 场景二:转发到后台的某一个方法(其他类)
    @RequestMapping("/hello7")
    public String hello7(){
        System.out.println("hello7");
        return "forward:/param/hello1";
    }

测试结果

重定向

java 复制代码
 // 场景三:重定向到后台的某一个方法(当前类)
    @RequestMapping("/hello8")
    public String hello8(){
        System.out.println("hello8");
        return "forward:hello2";
    }

    // 场景四:重定向后台的某一个方法(其他类)
    @RequestMapping("/hello9")
    public String hello9(){
        System.out.println("hello9");
        return "forward:/param/hello1";
    }

测试结果

相关推荐
憨子周41 分钟前
2M的带宽怎么怎么设置tcp滑动窗口以及连接池
java·网络·网络协议·tcp/ip
霖雨2 小时前
使用Visual Studio Code 快速新建Net项目
java·ide·windows·vscode·编辑器
SRY122404192 小时前
javaSE面试题
java·开发语言·面试
Fiercezm3 小时前
JUC学习
java
无尽的大道3 小时前
Java 泛型详解:参数化类型的强大之处
java·开发语言
ZIM学编程3 小时前
Java基础Day-Sixteen
java·开发语言·windows
我不是星海3 小时前
1.集合体系补充(1)
java·数据结构
放逐者-保持本心,方可放逐3 小时前
react 组件应用
开发语言·前端·javascript·react.js·前端框架
P.H. Infinity3 小时前
【RabbitMQ】07-业务幂等处理
java·rabbitmq·java-rabbitmq
爱吃土豆的程序员3 小时前
java XMLStreamConstants.CDATA 无法识别 <![CDATA[]]>
xml·java·cdata