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


"1.0" encoding="UTF-8"?>
 
"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">
  4.0.0
 
  org.example
  ssm
  1.0-SNAPSHOT
  war
 
  ssm Maven Webapp
  
  http://www.example.com
  
    UTF-8
    1.8
    1.8
    3.7.0
    
    
    5.0.2.RELEASE
    
    3.4.5
    
    5.1.44
    
    5.1.2
    
    1.3.1
    
    2.1.1
    2.4.3
    
    2.9.1
    3.2.0
    1.7.13
    
    4.12
    4.0.0
    1.18.2
    
    1.2
    1.1.2
    
    5.0.2.RELEASE
    2.9.3
  
  
    
    
      org.springframework
      spring-context
      ${spring.version}
    
    
      org.springframework
      spring-orm
      ${spring.version}
    
    
      org.springframework
      spring-tx
      ${spring.version}
    
    
      org.springframework
      spring-aspects
      ${spring.version}
    
    
      org.springframework
      spring-web
      ${spring.version}
    
    
      org.springframework
      spring-test
      ${spring.version}
    
    
    
      org.mybatis
      mybatis
      ${mybatis.version}
    
    
    
      mysql
      mysql-connector-java
      ${mysql.version}
    
    
    
      com.github.pagehelper
      pagehelper
      ${pagehelper.version}
    
    
    
      org.mybatis
      mybatis-spring
      ${mybatis.spring.version}
    
    
    
      org.apache.commons
      commons-dbcp2
      ${commons.dbcp2.version}
    
    
      org.apache.commons
      commons-pool2
      ${commons.pool2.version}
    
    
    
    
    
      org.slf4j
      slf4j-api
      ${slf4j.version}
    
    
      org.slf4j
      jcl-over-slf4j
      ${slf4j.version}
      runtime
    
    
      com.fasterxml.jackson.core
      jackson-databind
      ${jackson.version}
    
    
      com.fasterxml.jackson.core
      jackson-core
      ${jackson.version}
    
    
      com.fasterxml.jackson.core
      jackson-annotations
      ${jackson.version}
    
    
    
      org.apache.logging.log4j
      log4j-api
      ${log4j2.version}
    
    
      org.apache.logging.log4j
      log4j-core
      ${log4j2.version}
    
    
    
      org.apache.logging.log4j
      log4j-slf4j-impl
      ${log4j2.version}
    
    
    
      org.apache.logging.log4j
      log4j-web
      ${log4j2.version}
      runtime
    
    
    
      com.lmax
      disruptor
      ${log4j2.disruptor.version}
    
    
    
      junit
      junit
      ${junit.version}
      
    
    
      javax.servlet
      javax.servlet-api
      ${servlet.version}
      provided
    
    
      org.projectlombok
      lombok
      ${lombok.version}
      provided
    
    
    
      org.springframework
      spring-webmvc
      ${spring.version}
    
    
      jstl
      jstl
      ${jstl.version}
    
    
      taglibs
      standard
      ${standard.version}
    
  
  
    ssm
    
      
      
        src/main/java
        
          **/*.xml
        
      
      
      
        src/main/resources
        
          jdbc.properties
          *.xml
        
      
    
    
      
        org.apache.maven.plugins
        maven-compiler-plugin
        ${maven.compiler.plugin.version}
        
          ${maven.compiler.source}
          ${maven.compiler.target}
          ${project.build.sourceEncoding}
        
      
      
        org.mybatis.generator
        mybatis-generator-maven-plugin
        1.3.2
        
          
          
            mysql
            mysql-connector-java
            ${mysql.version}
          
        
        
          true
        
      
      
        maven-clean-plugin
        3.1.0
      
      
      
        maven-resources-plugin
        3.0.2
      
      
        maven-compiler-plugin
        3.8.0
      
      
        maven-surefire-plugin
        2.22.1
      
      
        maven-war-plugin
        3.2.2
      
      
        maven-install-plugin
        2.5.2
      
      
        maven-deploy-plugin
        2.8.2


//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" %>
    Title
springmvc 雷猴


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 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 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" %>
    Title
springmvc 雷猴
用户名：${currenName}
原产地：${location}
评价：${sign}

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 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 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";
    }
 
}

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原文地址：https://blog.csdn.net/weixin_73471776/article/details/132720542