史上最简单Spring Boot教程：第十篇Spring Boot与bootstrap界面版的增删查改（十）
转载请标明出处：https://blog.csdn.net/cms18374672699/article/details/87894000
本文出自DistressRroke _chen的博客
通过前面的文章学习，我想大家对springboot也有了一定的了解，下面我们开始做一个简单的SpringBoot与bootstrap界面版的增删查改，本次案例采取的是spring data jpa和bootstrap3来完成的，并没有使用github提供的分页插件Pagehelper，pagehelper与SSM配合分页在前面博客已经有所讲解。
一、创建项目工程
二、导入pom依赖
5.1.44 ${mysql.version} com.alibaba druid-spring-boot-starter 1.1.10 commons-fileupload commons-fileupload 1.3.1
三、配置application.yml文件
server:
servlet:
context-path: /springboot
spring:
jpa:
hibernate:
ddl-auto: update
show-sql: true
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=utf8
username: root
password: 123456
druid:
initial-size: 5
min-idle: 5
max-active: 20
max-wait: 60000
time-between-eviction-runs-millis: 60000
min-evictable-idle-time-millis: 30000
validation-query: SELECT 1 FROM DUAL
test-while-idle: true
test-on-borrow: true
test-on-return: false
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
filter:
stat:
merge-sql: true
slow-sql-millis: 5000
web-stat-filter:
enabled: true
url-pattern: /*
exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
session-stat-enable: true
session-stat-max-count: 100
stat-view-servlet:
enabled: true
url-pattern: /druid/*
reset-enable: true
login-username: admin
login-password: admin
allow: 127.0.0.1
thymeleaf:
cache: false
# 解决图片上传大小限制问题，也可采取配置类
servlet:
multipart:
max-file-size: 20MB
max-request-size: 60MB项目结构图
创建实体类
编写entity层，自动创建数据库表以及表字段
@Entity
@Table(name = "t_springboot_teacher")
@ToString
public class Teacher {
@Id
private Integer tid;
@Column(length = 16)
private String tname;
@Column(length = 4)
private String sex;
@Column(length = 100)
private String description;
@Column(length = 200)
private String imagePath;
public Integer getTid() {
return tid;
}
public void setTid(Integer tid) {
this.tid = tid;
}
public String getTname() {
return tname;
}
public void setTname(String tname) {
this.tname = tname;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getImagePath() {
return imagePath;
}
public void setImagePath(String imagePath) {
this.imagePath = imagePath;
}
}启动项目springboot05Application.java类，实体类的表以及表字段就在数据库创建成功了
@SpringBootApplication
public class Springboot05Application {
public static void main(String[] args) {
SpringApplication.run(Springboot05Application.class, args);
}
}编写config层（资源映射路径）
/**
* 资源映射路径
*/
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurationSupport {
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
registry.addResourceHandler("/uploadImages/**").addResourceLocations("file:E:/temp/");
super.addResourceHandlers(registry);
}
}创建utils包，包下存放PageBean（分页工具类）、PageUtil（分页封装类）、StringUtils（助手类）
PageBean（分页工具类）
/**
* 分页工具类
*/
public class PageBean {
private int page = 1;// 页码
private int rows = 3;// 页大小
private int total = 0;// 总记录数
private boolean pagination = true;// 是否分页
// 保存上次查询的参数
private Map paramMap;
// 保存上次查询的url
private String url;
public void setRequest(HttpServletRequest request) {
String page = request.getParameter("page");
String rows = request.getParameter("offset");
String pagination = request.getParameter("pagination");
this.setPage(page);
this.setRows(rows);
this.setPagination(pagination);
this.setUrl(request.getRequestURL().toString());
this.setParamMap(request.getParameterMap());
}
public PageBean() {
super();
}
public Map getParamMap() {
return paramMap;
}
public void setParamMap(Map paramMap) {
this.paramMap = paramMap;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public void setPage(String page) {
if(StringUtils.isNotBlank(page)) {
this.page = Integer.parseInt(page);
}
}
public int getRows() {
return rows;
}
public void setRows(String rows) {
if(StringUtils.isNotBlank(rows)) {
this.rows = Integer.parseInt(rows);
}
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public void setTotal(String total) {
if(StringUtils.isNotBlank(total)) {
this.total = Integer.parseInt(total);
}
}
public boolean isPagination() {
return pagination;
}
public void setPagination(boolean pagination) {
this.pagination = pagination;
}
public void setPagination(String pagination) {
if(StringUtils.isNotBlank(pagination) && "false".equals(pagination)) {
this.pagination = Boolean.parseBoolean(pagination);
}
}
/**
* 最大页
* @return
*/
public int getMaxPage() {
int max = this.total/this.rows;
if(this.total % this.rows !=0) {
max ++ ;
}
return max;
}
/**
* 下一页
* @return
*/
public int getNextPage() {
int nextPage = this.page + 1;
if(nextPage > this.getMaxPage()) {
nextPage = this.getMaxPage();
}
return nextPage;
}
/**
* 上一页
* @return
*/
public int getPreviousPage() {
int previousPage = this.page -1;
if(previousPage < 1) {
previousPage = 1;
}
return previousPage;
}
/**
* 获得起始记录的下标
*
* @return
*/
public int getStartIndex() {
return (this.page - 1) * this.rows;
}
@Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
}
}
PageUtil（分页封装类）
public class PageUtil {
public static String createPageCode(PageBean pageBean) {
StringBuffer sb = new StringBuffer();
/*
* 拼接向后台提交数据的form表单
* 注意：拼接的form表单中的page参数是变化的，所以不需要保留上一次请求的值
*/
sb.append("");
if(pageBean.getTotal()==0){
return "未查询到数据";
}else{
sb.append("首页 ");
if(pageBean.getPage()>1){
sb.append("上一页 ");
}else{
sb.append("上一页 ");
}
for(int i=pageBean.getPage()-1;i<=pageBean.getPage()+1;i++){
if(i<1||i>pageBean.getMaxPage()){
continue;
}
if(i==pageBean.getPage()){
sb.append(""+i+" ");
}else{
sb.append(""+i+" ");
}
}
if(pageBean.getPage()下一页");
}else{
sb.append("下一页 ");
}
sb.append("尾页 ");
}
/*
* 给分页条添加与后台交互的js代码
*/
sb.append("");
return sb.toString();
}
} StringUtils（助手类）
package com.example.springboot_quartz.utils;
public class StringUtils {
// 私有的构造方法，保护此类不能在外部实例化
private StringUtils() {
}
/**
* 如果字符串等于null或去空格后等于""，则返回true，否则返回false
*
* @param s
* @return
*/
public static boolean isBlank(String s) {
boolean b = false;
if (null == s || s.trim().equals("")) {
b = true;
}
return b;
}
/**
* 如果字符串不等于null或去空格后不等于""，则返回true，否则返回false
*
* @param s
* @return
*/
public static boolean isNotBlank(String s) {
return !isBlank(s);
}
}
编写dao层
/* 只要继承JpaRepository，通常所用的增删查改方法都有
* 第一个参数：操作的实体类
* 第二个参数：实体类对应数据表的主键
* 要使用高级（带条件）查询必须继承
* org.springframework.data.jpa.repository.JpaSpecificationExecutor接口
*/
public interface TeacherDao extends JpaRepository, JpaSpecificationExecutor {
} 编写service层
public interface TeacherService {
public Teacher save(Teacher teacher);
public void deleteById(Integer id);
public Teacher findById(Integer id);
public Page listPager(Teacher teacher, PageBean pageBean);
} 编写service.impl层
@Service
public class TeacherServiceImpl implements TeacherService {
@Autowired
private TeacherDao teacherDao;
@Override
public Teacher save(Teacher teacher) {
return teacherDao.save(teacher);
}
@Override
public void deleteById(Integer id) {
teacherDao.deleteById(id);
}
@Override
public Teacher findById(Integer id) {
return teacherDao.findById(id).get();
}
@Override
public Page listPager(Teacher teacher, PageBean pageBean) {
// jpa的Pageable分页是从0页码开始
Pageable pageable = PageRequest.of(pageBean.getPage()-1, pageBean.getRows());
return teacherDao.findAll(new Specification() {
@Override
public Predicate toPredicate(Root root, CriteriaQuery criteriaQuery, CriteriaBuilder criteriaBuilder) {
Predicate predicate = criteriaBuilder.conjunction();
if(teacher != null){
if(StringUtils.isNotBlank(teacher.getTname())){
predicate.getExpressions().add(criteriaBuilder.like(root.get("tname"),"%"+teacher.getTname()+"%"));
}
}
return predicate;
}
},pageable);
}
} 编写controller层
@Controller
@RequestMapping("/teacher")
public class TeacherController {
@Autowired
private TeacherService teacherService;
@RequestMapping("/listPager")
public ModelAndView list(Teacher teacher, HttpServletRequest request){
PageBean pageBean = new PageBean();
pageBean.setRequest(request);
ModelAndView modelAndView = new ModelAndView();
Page teachers = teacherService.listPager(teacher, pageBean);
modelAndView.addObject("teachers",teachers.getContent());
pageBean.setTotal(teachers.getTotalElements()+"");
modelAndView.addObject("pageCode", PageUtil.createPageCode(pageBean)/*.replaceAll("<","<").replaceAll(">:",">")*/);
modelAndView.setViewName("list");
return modelAndView;
}
@RequestMapping("/toEdit")
public ModelAndView toEdit(Teacher teacher){
ModelAndView modelAndView = new ModelAndView();
modelAndView.setViewName("edit");
modelAndView.addObject("sexArr",new String[]{"男","女"});
if(!(teacher.getTid() == null || "".equals(teacher.getTid()))) {
Teacher t = teacherService.findById(teacher.getTid());
modelAndView.addObject("teacher", t);
}
return modelAndView;
}
@RequestMapping("/add")
public String add(Teacher teacher, MultipartFile image){
try {
String diskPath = "E://temp/"+image.getOriginalFilename();
String serverPath = "http://localhost:8080/springboot/uploadImages/"+image.getOriginalFilename();
if(StringUtils.isNotBlank(image.getOriginalFilename())){
FileUtils.copyInputStreamToFile(image.getInputStream(),new File(diskPath));
teacher.setImagePath(serverPath);
}
teacherService.save(teacher);
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:/teacher/listPager";
}
@RequestMapping("/edit")
public String edit(Teacher teacher, MultipartFile image){
String diskPath = "E://temp/"+image.getOriginalFilename();
String serverPath = "http://localhost:8080/springboot/uploadImages/"+image.getOriginalFilename();
if(StringUtils.isNotBlank(image.getOriginalFilename())){
try {
FileUtils.copyInputStreamToFile(image.getInputStream(),new File(diskPath));
teacher.setImagePath(serverPath);
} catch (IOException e) {
e.printStackTrace();
}
}
teacherService.save(teacher);
return "redirect:/teacher/listPager";
}
@RequestMapping("/del/{bid}")
public String del(@PathVariable(value = "bid") Integer bid){
teacherService.deleteById(bid);
return "redirect:/teacher/listPager";
}
} 在resources的static目录下创建css、images、js文件
把bootstrap3的文件放到js文件目录下，把html页面放到templates文件下
bootstrap3文件下载：https://download.csdn.net/download/cms18374672699/10972169
list.html展示页面
书籍列表
新增
ID
头像
姓名
性别
简介
操作
![]()
删除
修改
edit.html编辑页面
用户编辑界面
输入地址：http://localhost:8080/springboot/teacher/listPager
效果如下
