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這篇文章主要講解了Spring boot2+jpa+thymeleaf如何實現增刪改查，內容清晰明了，對此有興趣的小伙伴可以學習一下，相信大家閱讀完之后會有幫助。
一、pom.xml引入相關模塊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 = 9001 spring.datasource.driver-class-name = oracle.jdbc.driver.OracleDriver spring.datasource.url = jdbc:oracle:thin:@127.0.0.1:1521:testdb spring.datasource.username = dev spring.datasource.password = dev spring.jpa.hibernate.ddl-auto = update spring.jpa.show-sql = true spring.thymeleaf.cache = false
說明：
1、由于本機的8080已經被使用，修改一下端口號為9001。
2、hibernate.hbm2ddl.auto參數有四個值：
create： 每次加載hibernate時都會刪除上一次的生成的表，然后根據你的model類再重新來生成新表，哪怕兩次沒有任何改變也要
這樣執行，這就是導致數據庫表數據丟失的一個重要原因。
create-drop ：每次加載hibernate時根據model類生成表，但是sessionFactory一關閉,表就自動刪除。
update：最常用的屬性，第一次加載hibernate時根據model類會自動建立起表的結構（前提是先建立好數據庫），以后加載
hibernate時根據 model類自動更新表結構，即使表結構改變了但表中的行仍然存在不會刪除以前的行。要注意的是當部署到服務器后，表結構是不會被馬上建立起來的，是要等 應用第一次運行起來后才會。
validate ：每次加載hibernate時，驗證創建數據庫表結構，只會和數據庫中的表進行比較，不會創建新表，但是會插入新值。
3、show-sql 是否打印出自動生產的SQL，方便調試的時候查看
4、propertiesspring.thymeleaf.cache=false是關閉thymeleaf的緩存，不然在開發過程中修改頁面不會立刻生效需要重啟，生產
可配置為true。
三、啟動類需要添加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;
@SpringBootApplication
public 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、數據庫層代碼
1、實體類映射數據庫表
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="用戶名不能為空")
private String userName;
@Column(nullable = false)
@NotEmpty(message="密碼不能為空")
@Length(min=6, message="密碼長度不能少于6位")
private String password;
@Column(nullable = false)
private int age;
//必須有構造
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、繼承JpaRepository類會自動實現很多內置的方法
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、業務層
service調用jpa實現相關的增刪改查，實際項目中service層處理具體的業務代碼。
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;
@Service
public 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、控制層
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;
@Controller
public 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、頁面
1、列表頁 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="@{/css/bootstrap.css}" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></link>
</head>
<body class="container">
<br/>
<h2>用戶列表</h2>
<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="${user.age}">6</td>
<td><a th:href="@{/toEdit(id=${user.id})}" rel="external nofollow" >edit</a></td>
<td><a th:href="@{/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="/toAdd" rel="external nofollow" rel="external nofollow" th:href="@{/toAdd}" rel="external nofollow" class="btn btn-info">add</a>
</div>
</div>
</body>
</html>
2、新增頁 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="@{/css/bootstrap.css}" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></link>
</head>
<body class="container">
<br/>
<h2>添加用戶</h2>
<br/><br/>
<div class="with:80%">
<form class="form-horizontal" 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" class="form-control" name="userName" id="userName" placeholder="userName"/>
</div>
</div>
<div class="form-group">
<label for="password" class="col-sm-2 control-label" >Password</label>
<div class="col-sm-10">
<input type="password" class="form-control" name="password" id="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" class="form-control" name="age" id="age" placeholder="age"/>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<input type="submit" value="Submit" class="btn btn-info" />
<input type="reset" value="Reset" class="btn btn-info" />
</div>
</div>
</form>
</div>
</body>
</html>
3、修改頁 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="@{/css/bootstrap.css}" rel="external nofollow" rel="external nofollow" rel="external nofollow" ></link>
</head>
<body class="container">
<br/>
<h2>修改用戶</h2>
<br/><br/>
<div class="with:80%">
<form class="form-horizontal" 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" class="form-control" name="userName" id="userName" th:value="*{userName}"
placeholder="userName"/>
</div>
</div>
<div class="form-group">
<label for="password" class="col-sm-2 control-label" >Password</label>
<div class="col-sm-10">
<input type="password" class="form-control" name="password" id="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" class="form-control" name="age" id="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" class="btn btn-info" />
<a href="/toAdd" rel="external nofollow" rel="external nofollow" th:href="@{/list}" rel="external nofollow" class="btn btn-info">Back</a>
</div>
</div>
</form>
</div>
</body>
</html>看完上述內容，是不是對Spring boot2+jpa+thymeleaf如何實現增刪改查有進一步的了解，如果還想學習更多內容，歡迎關注億速云行業資訊頻道。
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