Spring boot2+jpa+thymeleaf实现增删改查

一、pom.xml引入相关模块web、jpa、thymeleaf、oracle：

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc8</artifactId> <version>12.2.0.1</version> </dependency>

二、application.properties配置

server.port = 9001spring.datasource.driver-class-name = oracle.jdbc.driver.OracleDriverspring.datasource.url = jdbc:oracle:thin:@127.0.0.1:1521:testdbspring.datasource.username = devspring.datasource.password = devspring.jpa.hibernate.ddl-auto = updatespring.jpa.show-sql = truespring.thymeleaf.cache = false

说明：

1、由于本机的8080已经被使用，修改一下端口号为9001。

2、hibernate.hbm2ddl.auto参数有四个值：

create： 每次加载hibernate时都会删除上一次的生成的表，然后根据你的model类再重新来生成新表，哪怕两次没有任何改变也要这样执行，这就是导致数据库表数据丢失的一个重要原因。

create-drop ：每次加载hibernate时根据model类生成表，但是sessionFactory一关闭,表就自动删除。

update：最常用的属性，第一次加载hibernate时根据model类会自动建立起表的结构（前提是先建立好数据库），以后加载hibernate时根据 model类自动更新表结构，即使表结构改变了但表中的行仍然存在不会删除以前的行。要注意的是当部署到服务器后，表结构是不会被马上建立起来的，是要等 应用第一次运行起来后才会。validate ：每次加载hibernate时，验证创建数据库表结构，只会和数据库中的表进行比较，不会创建新表，但是会插入新值。

3、show-sql 是否打印出自动生产的SQL，方便调试的时候查看

4、propertiesspring.thymeleaf.cache=false是关闭thymeleaf的缓存，不然在开发过程中修改页面不会立刻生效需要重启，生产可配置为true。

三、启动类需要添加Servlet的支持

package com.example.demo;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;@SpringBootApplicationpublic class DemoApplication extends SpringBootServletInitializer { @Override protected SpringApplicationBuilder configure(SpringApplicationBuilder application) { return application.sources(DemoApplication.class); } public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); }}

四、数据库层代码

1、实体类映射数据库表

package com.example.demo.entity;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.Table;import javax.validation.constraints.NotEmpty;import org.hibernate.validator.constraints.Length;@Entity@Table(name = 'userinfo')public class User { @Id @GeneratedValue private long id; @Column(nullable = false, unique = true) @NotEmpty(message='用户名不能为空') private String userName; @Column(nullable = false) @NotEmpty(message='密码不能为空') @Length(min=6, message='密码长度不能少于6位') private String password; @Column(nullable = false) private int age; //必须有构造 public User() { } public long getId() { return id; } public User setId(long id) { this.id = id; return this; } public String getUserName() { return userName; } public User setUserName(String userName) { this.userName = userName; return this; } public String getPassword() { return password; } public User setPassword(String password) { this.password = password; return this; } public int getAge() { return age; } public User setAge(int age) { this.age = age; return this; }}

2、继承JpaRepository类会自动实现很多内置的方法

package com.example.demo.repository;import org.springframework.data.jpa.repository.JpaRepository;import com.example.demo.entity.User;public interface UserRepository extends JpaRepository<User, Long> { User findById(long id); void deleteById(Long id);}

五、业务层

service调用jpa实现相关的增删改查，实际项目中service层处理具体的业务代码。

1、UserService.java

package com.example.demo.service;import java.util.List;import org.springframework.data.domain.Page;import org.springframework.data.domain.Pageable;import com.example.demo.entity.User;public interface UserService { public Page<User> getUserPage(Pageable pageable); public List<User> getUserList(); public User findUserById(long id); public void save(User user); public void edit(User user); public void delete(long id);}

2、UserServiceImpl.java

package com.example.demo.service.impl;import java.util.List;import java.util.Optional;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.domain.Page;import org.springframework.data.domain.Pageable;import org.springframework.stereotype.Service;import com.example.demo.entity.User;import com.example.demo.repository.UserRepository;import com.example.demo.service.UserService;@Servicepublic class UserServiceImpl implements UserService { @Autowired private UserRepository userRepository; @Override public Page<User> getUserPage(Pageable pageable) { return userRepository.findAll(pageable); } @Override public List<User> getUserList() { return userRepository.findAll(); } @Override public User findUserById(long id) { return userRepository.findById(id) ; } @Override public void save(User user) { userRepository.save(user); } @Override public void edit(User user) { userRepository.save(user); } @Override public void delete(long id) { userRepository.deleteById(id); }}

六、控制层

package com.example.demo.web.controller;import java.util.List;import javax.annotation.Resource;import javax.validation.Valid;import org.springframework.data.domain.Page;import org.springframework.data.domain.PageRequest;import org.springframework.data.domain.Pageable;import org.springframework.data.domain.Sort;import org.springframework.data.domain.Sort.Direction;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.validation.BindingResult;import org.springframework.validation.ObjectError;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.example.demo.entity.User;import com.example.demo.service.UserService;@Controllerpublic class UserController { @Resource UserService userService; @RequestMapping('/') public String index() { return 'redirect:/list'; } @RequestMapping('/list') public String list(Model model) { List<User> users=userService.getUserList(); model.addAttribute('users', users);/*int page=1,size=2; Sort sort = new Sort(Direction.DESC, 'id'); Pageable pageable = PageRequest.of(page, size, sort); model.addAttribute('users', pageable);*/return 'user/list'; } @RequestMapping('/toAdd') public String toAdd() { return 'user/userAdd'; } @RequestMapping('/add') public @ResponseBody User add(@Valid User user, BindingResult result) { if (result.hasErrors()) { List<ObjectError> list = result.getAllErrors(); for (ObjectError error : list) {System.out.println(error.getDefaultMessage()); } return null; } userService.save(user); return user; } @RequestMapping('/toEdit') public String toEdit(Model model,Long id) { User user=userService.findUserById(id); model.addAttribute('user', user); return 'user/userEdit'; } @RequestMapping('/edit') public String edit(User user) { userService.edit(user); return 'redirect:/list'; } @RequestMapping('/delete') public String delete(Long id) { userService.delete(id); return 'redirect:/list'; }}

七、页面

1、列表页 list.hmtl

<!DOCTYPE html><html lang='en' xmlns:th='http://www.thymeleaf.org'><head> <meta charset='UTF-8'/> <title>userList</title> <link rel='stylesheet' th:href='https://www.haobala.com/bcjs/@{/css/bootstrap.css}' rel='external nofollow' rel='external nofollow' rel='external nofollow' ></link></head><body class='container'><br/><h1>用户列表</h1><br/><br/><div class='with:80%'> <table class='table table-hover'> <thead> <tr> <th>#</th> <th>User Name</th> <th>Password</th> <th>Age</th> <th>Edit</th> <th>Delete</th> </tr> </thead> <tbody> <tr th:each='user : ${users}'> <th scope='row' th:text='${user.id}'>1</th> <td th:text='${user.userName}'>neo</td> <td th:text='${user.password}'>Otto</td> <td th:text='${user.age}'>6</td> <td><a th:href='https://www.haobala.com/bcjs/@{/toEdit(id=${user.id})}' rel='external nofollow' >edit</a></td> <td><a th:href='https://www.haobala.com/bcjs/@{/delete(id=${user.id})}' rel='external nofollow' >delete</a></td> </tr> </tbody> </table></div><div class='form-group'> <div class='col-sm-2 control-label'> <a href='https://www.haobala.com/toAdd' rel='external nofollow' rel='external nofollow' th:href='https://www.haobala.com/bcjs/@{/toAdd}' rel='external nofollow' class='btn btn-info'>add</a> </div></div></body></html>

2、新增页 userAdd.html

<!DOCTYPE html><html lang='en' xmlns:th='http://www.thymeleaf.org'><head> <meta charset='UTF-8'/> <title>user</title> <link rel='stylesheet' th:href='https://www.haobala.com/bcjs/@{/css/bootstrap.css}' rel='external nofollow' rel='external nofollow' rel='external nofollow' ></link></head><body class='container'><br/><h1>添加用户</h1><br/><br/><div class='with:80%'> <form th:action='@{/add}' method='post'> <div class='form-group'> <label for='userName' class='col-sm-2 control-label'>userName</label> <div class='col-sm-10'><input type='text' name='userName' placeholder='userName'/> </div> </div> <div class='form-group'> <label for='password' >Password</label> <div class='col-sm-10'><input type='password' name='password' placeholder='Password'/> </div> </div> <div class='form-group'> <label for='age' class='col-sm-2 control-label'>age</label> <div class='col-sm-10'><input type='text' name='age' placeholder='age'/> </div> </div> <div class='form-group'> <div class='col-sm-offset-2 col-sm-10'><input type='submit' value='Submit' />&nbsp; &nbsp; &nbsp;<input type='reset' value='Reset' /> </div> </div> </form></div></body></html>

3、修改页 userEdit.html

<!DOCTYPE html><html lang='en' xmlns:th='http://www.thymeleaf.org'><head> <meta charset='UTF-8'/> <title>user</title> <link rel='stylesheet' th:href='https://www.haobala.com/bcjs/@{/css/bootstrap.css}' rel='external nofollow' rel='external nofollow' rel='external nofollow' ></link></head><body class='container'><br/><h1>修改用户</h1><br/><br/><div class='with:80%'> <form th:action='@{/edit}' th:object='${user}' method='post'> <input type='hidden' name='id' th:value='*{id}' /> <div class='form-group'> <label for='userName' class='col-sm-2 control-label'>userName</label> <div class='col-sm-10'><input type='text' name='userName' th:value='*{userName}' placeholder='userName'/> </div> </div> <div class='form-group'> <label for='password' >Password</label> <div class='col-sm-10'><input type='password' name='password' th:value='*{password}' placeholder='Password'/> </div> </div> <div class='form-group'> <label for='age' class='col-sm-2 control-label'>age</label> <div class='col-sm-10'><input type='text' name='age' th:value='*{age}' placeholder='age'/> </div> </div> <div class='form-group'> <div class='col-sm-offset-2 col-sm-10'><input type='submit' value='Submit' />&nbsp; &nbsp; &nbsp;<a href='https://www.haobala.com/toAdd' rel='external nofollow' rel='external nofollow' th:href='https://www.haobala.com/bcjs/@{/list}' rel='external nofollow' class='btn btn-info'>Back</a> </div> </div> </form></div></body></html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。