SpringMVC之综合案例：参数传递，向页面传参，页面跳转

参数传递
向页面传参
页面跳转

1.参数传递

<?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>org.example</groupId>
  <artifactId>ssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>ssm 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>${commons.dbcp2.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
      <version>${commons.pool2.version}</version>
    </dependency>

    <!-- 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>

    <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>

    <!--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>

    <!--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>

  </dependencies>

  <build>
    <finalName>ssm</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>

//index.xml
<%--
  Created by IntelliJ IDEA.
  User: 朱
  Date: 2023/9/6
  Time: 12:40
  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>springmvc 雷猴</h1>
</body>
</html>

package com.zlj.web;

import com.zlj.model.Book;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

/**
 * @author zlj
 * @create 2023-09-06 12:32
 */
@Slf4j
@Controller
@RequestMapping("/param")
public class ParamController {
    @RequestMapping("/hello1")
      public String index(String bname,Integer bid){
//        System.out.println("hello springmvc...");
        log.info("简单类型参数：bname:{},bid:{}",bname,bid);
//        fail.. error waring info debug
        return "index";
    }
    @RequestMapping("/hello2")
    public String hello2(Book book, HttpServletRequest request){
//        System.out.println("hello springmvc...");
//        servlet参数获取方式
        log.info("复杂类型参数：bname:{},bid:{}",
                request.getParameter("bname"),
                request.getParameter("bid"));
//        复杂传参
        log.info("复杂类型参数：book:{}",
                book.toString());
//        fail.. error waring info debug
        return "index";
    }
    @RequestMapping("/hello3")
    public String hello3(
            @RequestParam String bname,
            @RequestParam(required = false) Integer bid){
//        System.out.println("hello springmvc...");
        log.info("简单类型参数：bname:{},bid:{}",bname,bid);
//        fail.. error waring info debug
        return "index";
    }
    @RequestMapping("/hello4/{bid}")
    public String hello4(@PathVariable("bid") Integer bid){
//        System.out.println("hello springmvc...");
        log.info("@pathvariable:bid:{}",bid);
//        fail.. error waring info debug
        return "index";
    }

    @RequestMapping("/hello5")
    public String hello5(Map map){
//        System.out.println("hello springmvc...");
        log.info("@RequestBody：map:{}",map);
//        fail.. error waring info debug
        return "index";
    }
    @RequestMapping("/hello6")
    public String hello6(@RequestBody Map map){
//        System.out.println("hello springmvc...");
        log.info("@RequestBody：map:{}",map);
//        fail.. error waring info debug
        return "index";
    }
    @RequestMapping("/hello7")
    public String hello7(@RequestHeader("jwt") String jwt){
//        System.out.println("hello springmvc...");
        log.info("@RequestHeader：jwt:{}",jwt);
//        fail.. error waring info debug
        return "index";
    }
    @RequestMapping("/hello8")
    public String hello8(
            Book book,
            @RequestBody Map map,
            @RequestHeader("jwt") String jwt){
//        System.out.println("hello springmvc...");
        log.info("book：book:{}",book.toString());
        log.info("@RequestBorder：map:{}",map);
        log.info("@RequestHeader：jwt:{}",jwt);
//        fail.. error waring info debug
        return "index";
    }





    @GetMapping
    public String type1(@RequestBody Map map){
        System.out.println("getMapping...");
        return "index";
    }
    @PostMapping
    public String type2(@RequestBody Map map){
        System.out.println("postMapping...");
        return "index";
    }
    @PutMapping
    public String type3(@RequestBody Map map){
        System.out.println("putMapping...");
        return "index";
    }
    @DeleteMapping
    public String type4(@RequestBody Map map){
        System.out.println("DeleteMapping...");
        return "index";
    }
    //requestMapping=GetMapping+PostMapping+PutMapping+DeleteMapping
//    @RequestMapping不安全，不具备标识意义
    //@compontent=repository+service+controller


}

注：方法如以上，hell1到hello5通过浏览器打印到控制台输出；hello6，hello7，hello8以及type1到type4用Apikit软件发送到打印台。

方法6中@requestBody需要导入依赖，上面pom.xml已经是完整版

hello6的打印方法，及结果

hello6的打印方法第二种写法

hello7及hello8的打印结果，此处不详细，可以去搜索资料看怎么熟练并应用Apikit

2.向页面传参

package com.zlj.web;

import com.zlj.util.ResponseUtil;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * @author zlj
 * @create 2023-09-06 18:20
 */
@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();
        }
    }
    @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;
    }
    @RequestMapping("/hello3")
    public String hello3(){
        return "index";
    }
    //String+mondel
    @RequestMapping("/hello4")
    public String hello4(Model model, HttpServletRequest request){
        model.addAttribute("currenName","永州鸭");
        request.setAttribute("location","道州");
        return "index";
    }
   //modelandView
    @RequestMapping("/hello5")
    public ModelAndView hello5(){
        ModelAndView mv=new ModelAndView();
        mv.addObject("sign","肥而不腻");
        mv.setViewName("index");
        return mv;
    }
}

<%--
  Created by IntelliJ IDEA.
  User: 朱
  Date: 2023/9/6
  Time: 12:40
  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>springmvc 雷猴</h1>
用户名：${currenName}
原产地：${location}
评价：${sign}
</body>
</html>

3.页面跳转(hello6,hello7,hello8,hello9)

package com.zlj.web;

import com.zlj.util.ResponseUtil;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * @author zlj
 * @create 2023-09-06 18:20
 */
@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();
        }
    }

    @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;
    }

    @RequestMapping("/hello3")
    public String hello3() {
        return "index";
    }

    //String+mondel
    @RequestMapping("/hello4")
    public String hello4(Model model, HttpServletRequest request) {
        model.addAttribute("currenName", "永州鸭");
        request.setAttribute("location", "道州");
        return "index";
    }

    //modelandView
    @RequestMapping("/hello5")
    public ModelAndView hello5() {
        ModelAndView mv = new ModelAndView();
        mv.addObject("sign", "肥而不腻");
        mv.setViewName("index");
        return mv;
    }

    // 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("helo6...");
        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";
    }
    // 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("helo8...");
        return "redirect:hello2";
    }
    // 场景四：重定向到后台的某一个方法（其他类）
    @RequestMapping("/hello9")
    public String hello9() {
        System.out.println("hello9...");
        return "redirect:/param/hello1";
    }

}