IDEA+maven+SpringBoot+JPA+Thymeleaf实现Crud及分页

 <mirror>
 <id>nexus-aliyun</id>
 <mirrorOf>central</mirrorOf>
 <name>Nexus aliyun</name>
<url>http://maven.aliyun.com/nexus/content/groups/public</url>
</mirror>

<!-- 全局jdk配置，settings.xml --> 
<profile> 
 <id>jdk18</id> 
 <activation> 
 <activeByDefault>true</activeByDefault> 
 <jdk>1.8</jdk> 
 </activation> 
 <properties> 
 <maven.compiler.source>1.8</maven.compiler.source> 
 <maven.compiler.target>1.8</maven.compiler.target> 
 <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion> 
 </properties> 
</profile>

<?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>cn.temptation</groupId>
 <artifactId>studySpringBoot</artifactId>
 <version>1.0-SNAPSHOT</version>
 <!-- 使用spring boot的默认设置 -->
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.0.0.RELEASE</version>
 </parent>
 <dependencies>
 <!-- web -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <!-- thymeleaf -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>
 <!-- mysql-->
 <dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <version>5.1.21</version>
 </dependency>
 <!-- jpa-->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-jpa</artifactId>
 </dependency>
 </dependencies>
</project>

# 数据库连接
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=sa
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# JPA配置
spring.jpa.properties.hibernate.hbm2ddl.auto=update

package cn.temptation;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootApplication {
 public static void main(String[] args) {
 // SpringBoot项目启动
 SpringApplication.run(SpringbootApplication.class, args);
 }
}

package cn.temptation.model;
import javax.persistence.*;
// 建库建表
//DROP TABLE category;
//
//CREATE TABLE category
//(
// categoryid INT AUTO_INCREMENT PRIMARY KEY,
// categoryname VARCHAR(10) NOT NULL
//);
//
//INSERT INTO category VALUES(NULL, '手机'), (NULL, '图书'), (NULL, '服装'), (NULL, '鞋帽');
//
//SELECT * FROM category;
@Entity
@Table(name = "category")
public class Category {
 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 @Column(name = "categoryid")
 private Integer categoryid;
 @Column(name = "categoryname")
 private String categoryname;
 public Integer getCategoryid() {
 return categoryid;
 }
 public void setCategoryid(Integer categoryid) {
 this.categoryid = categoryid;
 }
 public String getCategoryname() {
 return categoryname;
 }
 public void setCategoryname(String categoryname) {
 this.categoryname = categoryname;
 }
}

package cn.temptation.dao;
import cn.temptation.model.Category;
import org.springframework.data.jpa.repository.JpaRepository;
public interface CategoryDao extends JpaRepository<Category, Integer> {
}

package cn.temptation.web;
import cn.temptation.dao.CategoryDao;
import cn.temptation.model.Category;
import org.springframework.beans.factory.annotation.Autowired;
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.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import java.util.List;
@Controller
public class CategoryController {
 @Autowired
 private CategoryDao categoryDao;
 /**
 * 不分页查询
 *
 * @return
 */
// @RequestMapping("/categorylist")
// public ModelAndView categorylist() {
// List<Category> list = categoryDao.findAll();
//
// ModelAndView mav = new ModelAndView("categorylist");
// mav.addObject("list", list);
// return mav;
// }
 /**
 * 分页查询
 *
 * @return
 */
 @RequestMapping("/categorylist")
 public ModelAndView categorylist(@RequestParam(value = "start", defaultValue = "0") Integer start,
   @RequestParam(value = "limit", defaultValue = "2") Integer limit) {
 start = start < 0 ? 0 : start;
 Sort sort = new Sort(Sort.DEFAULT_DIRECTION, "categoryid");
 Pageable pageable = new PageRequest(start, limit, sort);
 Page<Category> page = categoryDao.findAll(pageable);
// System.out.println(page.getNumber());
// System.out.println(page.getNumberOfElements());
// System.out.println(page.getSize());
// System.out.println(page.getTotalElements());
// System.out.println(page.getTotalPages());
// System.out.println(page.isFirst());
// System.out.println(page.isLast());
 ModelAndView mav = new ModelAndView("categorylist");
 mav.addObject("page", page);
 return mav;
 }
 /**
 * 类别新增视图
 * @return
 */
 @RequestMapping("/categoryinit")
 public String categoryinit() {
 return "categoryinit";
 }
 /**
 * 类别新增操作
 * @param model
 * @return
 */
 @RequestMapping("/categoryinsert")
 public String categoryinsert(Category model) {
 categoryDao.save(model);
 return "redirect:categorylist";
 }
 /**
 * 类别删除操作
 * @param categoryid
 * @return
 */
 @RequestMapping("/categorydelete")
 public String categorydelete(Integer categoryid) {
 categoryDao.deleteById(categoryid);
 return "redirect:categorylist";
 }
 /**
 * 类别编辑视图
 * @param categoryid
 * @return
 */
 @RequestMapping("/categoryedit")
 public ModelAndView categoryedit(Integer categoryid) {
 Category model = categoryDao.getOne(categoryid);
 ModelAndView mav = new ModelAndView("categoryedit");
 mav.addObject("category", model);
 return mav;
 }
 /**
 * 类别编辑操作
 * @param model
 * @return
 */
 @RequestMapping("/categoryupdate")
 public String categoryupdate(Category model) {
 categoryDao.save(model);
 return "redirect:categorylist";
 }
}

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>类别列表</title>
 <style>
 table, th, td {
 border: 1px solid green;
 border-collapse: collapse;
 }
 </style>
</head>
<body>
<a th:href="@{/categoryinit}">新增</a>
<table>
 <tr>
 <th>类别编号</th>
 <th>类别名称</th>
 <th>操&nbsp;&nbsp;作</th>
 </tr>
 <!--不分页遍历-->
 <!--<tr th:each="item : ${list}">-->
 <!--分页遍历-->
 <tr th:each="item : ${page.content}">
 <td th:text="${item.categoryid}">类别编号</td>
 <td th:text="${item.categoryname}">类别名称</td>
 <td>
 <a th:href="@{/categoryedit(categoryid=${item.categoryid})}">编辑</a>&nbsp;&nbsp;
 <a th:href="@{/categorydelete(categoryid=${item.categoryid})}">删除</a>
 </td>
 </tr>
</table>
<div>
 <a th:href="@{/categorylist(start=0)}">[首页]</a>&nbsp;&nbsp;
 <a th:if="${not page.isFirst()}" th:href="@{/categorylist(start=${page.number-1})}">[上页]</a>&nbsp;&nbsp;
 <a th:if="${not page.isLast()}" th:href="@{/categorylist(start=${page.number+1})}">[下页]</a>&nbsp;&nbsp;
 <a th:href="@{/categorylist(start=${page.totalPages-1})}">[末页]</a>
</div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>类别新增</title>
</head>
<body>
<form action="categoryinsert" method="post">
 <label for="txtCategoryname">类别名称：</label>
 <input type="text" id="txtCategoryname" name="categoryname" /><br/>
 <input type="submit" value="提交">
</form>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>类别编辑</title>
</head>
<body>
<form action="categoryupdate" method="post">
 <input type="hidden" id="txtCategoryid" name="categoryid" th:field="${category.categoryid}"/><br/>
 <label for="txtCategoryname">类别名称：</label>
 <input type="text" id="txtCategoryname" name="categoryname" th:field="${category.categoryname}"/><br/>
 <input type="submit" value="提交">
</form>
</body>
</html>