Spring Boot整合JSP --CRUD

Springboot整合JSP

spring boot与视图层次的整合：

  • JSP 效率低

  • Thymeleaf

java Server page 是Java提供的一种动态的网页技术，低层是Servlet，可以直接在HTML中插入Java代码

JSP的底层的原理：

JSP是一种中间层的组件，开发者可以在这个组件中将java代码，与html代码进行整合，有jsp的引擎组件转为Servlet，再把开发者定义在组件的混合代码翻译成Servlet的相应语句，输出给客户端。

1.创建工程：基于maven的项目

  <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>
  </properties>
  <!--    Spring boot父依赖-->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.4.RELEASE</version>
  </parent>
  <dependencies>
<!--    Spring boot-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>org.apache.tomcat.embed</groupId>
      <artifactId>tomcat-embed-jasper</artifactId>
      <version>9.0.26</version>
    </dependency>
  </dependencies>

2.创建Handler

package com.southwind.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/hello")
public class HelloHandler {
    @GetMapping("/index")
    public ModelAndView index(){
        ModelAndView modelAndView =new ModelAndView();
        modelAndView.setViewName("index");
        modelAndView.addObject("mess","hello spring boot");
        return modelAndView;
    }
}

3.JSP

<%--
  Created by IntelliJ IDEA.
  User: 郝泾钊
  Date: 2022-04-10
  Time: 13:34
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>index</h1>
        ${mess}
</body>
</html>

4.application.yml

server:
  port: 8181
spring:
  mvc:
    view:
      prefix: /
      suffix: .jsp

实际应用时

<!--    JSTL-->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
<!--    lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.22</version>
    </dependency>

lombok简化实体类代码的编写工作

常用的方法：getter、setter、toString自动生成lombox的使用要安装插件

实现增删改查(JSP)

1.实体类：User

package com.southwind.entity;

import lombok.AllArgsConstructor;
import lombok.Data;

@Data
@AllArgsConstructor
public class User {
    private Integer id;
    private  String name;
}

2.控制器：UserHandler

package com.southwind.controller;

import com.southwind.Service.UserService;
import com.southwind.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.List;

@Controller
@RequestMapping("/user")
public class UserMapper {
    @Autowired
    private UserService userService;
    @GetMapping("/findall")
    public ModelAndView findall(){
        ModelAndView modelAndView= new ModelAndView();
        modelAndView.setViewName("index");
        modelAndView.addObject("list",userService.finAll());
        return modelAndView;

    }
    @GetMapping("findbyid/{id}")
    public ModelAndView findById(@PathVariable("id") Integer id){
        ModelAndView modelAndView=new ModelAndView();
        modelAndView.setViewName("update");
        modelAndView.addObject("user",userService.findById(id));
        return  modelAndView;
    }
    @PostMapping("/save")
    public String save(User user){
        userService.save(user);
        return "redirect:/user/findall";
    }
    @GetMapping("/delete/{id}")
    public String deleteById(@PathVariable("id") Integer id){
        userService.delete(id);
        return "redirect:/findall";
    }
    @GetMapping("/update")
    public  String update( User user){
        userService.uodate(user);
        return "redirect:/user/findall";
    }
}

3.业务Service

接口：

package com.southwind.Service;

import com.southwind.entity.User;

import java.util.Collection;

public interface UserService {
    public Collection<User> finAll();
    public User findById(Integer id);
    public void  save(User user);
    public void delete(Integer id);
    public void uodate(User user);
}

实现类：

package com.southwind.Service.impl;

import com.southwind.Reposity.UserReposity;
import com.southwind.Service.UserService;
import com.southwind.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Collection;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserReposity userReposity;
    @Override
    public Collection<User> finAll() {
        return userReposity.finAll();
    }

    @Override
    public User findById(Integer id) {

        return userReposity.findById(id);
    }

    @Override
    public void save(User user) {
        userReposity.save(user);
    }

    @Override
    public void delete(Integer id) {
        userReposity.delete(id);
    }

    @Override
    public void uodate(User user) {
        userReposity.uodate(user);
    }
}

4.业务：Repositort

接口;

package com.southwind.Reposity;

import com.southwind.entity.User;

import java.util.Collection;

public interface UserReposity {
    public Collection<User> finAll();
    public User findById(Integer id);
    public void  save(User user);
    public void delete(Integer id);
    public void uodate(User user);
}

实现类：

package com.southwind.Reposity.impl;

import com.southwind.Reposity.UserReposity;
import com.southwind.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

@Repository
public class UserReposityImpl implements UserReposity {

    private static Map<Integer,User> map;
    static {
        map=new HashMap<>();
        map.put(1,new User(1,"张三"));
        map.put(2,new User(2,"李四"));
        map.put(3,new User(3,"王五"));
    }


    @Override
    public Collection<User> finAll() {
        return map.values();
    }

    @Override
    public User findById(Integer id) {
        return map.get(id);
    }

    @Override
    public void save(User user) {
        map.put(user.getId(),user);
    }

    @Override
    public void delete(Integer id) {
        map.remove(id);
    }

    @Override
    public void uodate(User user) {
    map.put(user.getId(),user);
    }
}

5.视图层JSP

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: 郝泾钊
  Date: 2022-04-10
  Time: 13:34
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>index</h1>
        ${mess}
    <table>
        <tr>
            <th>编号</th>
            <th>姓名</th>
            <th>操作</th>
        </tr>
        <c:forEach items="${list}" var="user">
            <tr>
                <td>${user.id}</td>
                <td>${user.name}</td>
                <td>
                    <a href="/user/delete/${user.id}">删除</a>
                    <a href="/user/findbyid/${user.id}">修改</a>
                </td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

save.jsp:

<%--
  Created by IntelliJ IDEA.
  User: 郝泾钊
  Date: 2022-04-10
  Time: 18:24
  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>
    <form action="/user/save" method="post">
        <input type="text" name="id"/><br>
        <input type="text" name="name"/><br>
        <input type="submit" value="提交">
    </form>
</body>
</html>

update.jsp

<%--
  Created by IntelliJ IDEA.
  User: 郝泾钊
  Date: 2022-04-10
  Time: 18:27
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="/user/update" method="post">
    <input type="text" name="id" value="${user.id}"/><br>
    <input type="text" name="name" value="${user.name}"/><br>
    <input type="submit" value="提交">
</form>
</body>
</html>

posted on 2022-06-23 22:59  Steam残酷  阅读(110)  评论(0)    收藏  举报
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