• springboot对JPA的支持

    springboot之jpa支持

    导入相关pom依赖

    1 <dependency>
2             <groupId>org.springframework.boot</groupId>
3             <artifactId>spring-boot-starter-data-jpa</artifactId>
4         </dependency>

    配置application.yml文件

     1 server:
 2   port: 80
 3   servlet:
 4     context-path: /
 5 spring:
 6   jpa:
 7     hibernate:
 8       ddl-auto: update
 9     show-sql: true
10   datasource:
11     #1.JDBC
12     type: com.alibaba.druid.pool.DruidDataSource
13     driver-class-name: com.mysql.jdbc.Driver
14     url: jdbc:mysql://localhost:3306/xufanqi?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
15     username: root
16     password: 123
17     druid:
18       initial-size: 5
19       min-idle: 5
20       max-active: 20
21       max-wait: 60000
22       time-between-eviction-runs-millis: 60000
23       min-evictable-idle-time-millis: 30000
24       validation-query: SELECT 1 FROM DUAL
25       test-while-idle: true
26       test-on-borrow: true
27       test-on-return: false
28       pool-prepared-statements: true
29       max-pool-prepared-statement-per-connection-size: 20
30       filter:
31         stat:
32           merge-sql: true
33           slow-sql-millis: 5000
34       web-stat-filter:
35         enabled: true
36         url-pattern: /*
37         exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
38         session-stat-enable: true
39         session-stat-max-count: 100
40       stat-view-servlet:
41         enabled: true
42         url-pattern: /druid/*
43         reset-enable: true
44         login-username: admin
45         login-password: admin
46         allow: 127.0.0.1
47   thymeleaf:
48     cache: false
49 
50    servlet:
51      multipart:
52        max-file-size: 20MB
53        max-request-size: 60MB

    自动建表相关代码

     1 @Entity
 2 @Table(name = "t_springboot_2019")
 3 public class Book {
 4     @Id
 5     @GeneratedValue
 6     private Integer bid;
 7     @Column(length = 100)
 8     private String bname;
 9     @Column
10     private Float price;

    自动在数据库建一个

    t_springboot_book表

    jpa值增删改查

    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

     1 package com.javaqi.springboot03.repository;
 2 
 3 import com.yuan.springboot03.entity.Book;
 4 import org.springframework.data.jpa.repository.JpaRepository;
 5 import org.springframework.stereotype.Repository;
 6 
 7  
 8 @Repository
 9 public interface BookRepository extends JpaRepository<Book, Integer> {
10 }

    controller层

    BookController 
     1 package com.javaqi.springboot03.controller;
 2 
 3 import com.javaqi.springboot03.entity.Book;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.data.jpa.repository.JpaRepository;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.bind.annotation.RestController;
 8 
 9 import java.util.List;
10 
11 @RestController
12 @RequestMapping("/book")
13 public class BookController {
14     @Autowired
15     private JpaRepository jpaDao;
16 
17     @RequestMapping("/add")
18     public String add(Book book){
19         jpaDao.save(book);
20         return "success";
21     }
22 
23     @RequestMapping("/edit")
24     public String edit(Book book){
25         jpaDao.save(book);
26         return "success";
27     }
28 
29     @RequestMapping("/del")
30     public String del(Book book){
31         jpaDao.delete(book);
32         return "success";
33     }
34 
35     @RequestMapping("/getOne")
36     public Book getOne(Integer bid){
37 //        会出现懒加载问题：org.hibernate.LazyInitializationException: could not initialize proxy - no Session
38 //        return jpaDao.getOne(bid);
39         return (Book)jpaDao.findById(bid).get();
40     }
41 
42     @RequestMapping("/getAll")
43     public List<Book> getAll(){
44         return jpaDao.findAll();
45     }
46 }

    浏览器访问效果

    Springboot+bootstrap界面版之增删改查及图片上传

    spring data jpa和bootstrap3来完成

    pom依赖

     1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>org.springframework.boot</groupId>
 7         <artifactId>spring-boot-starter-parent</artifactId>
 8         <version>2.2.1.RELEASE</version>
 9         <relativePath/> <!-- lookup parent from repository -->
10     </parent>
11     <groupId>com.javaqi</groupId>
12     <artifactId>springboot03</artifactId>
13     <version>0.0.1-SNAPSHOT</version>
14     <name>springboot03</name>
15     <description>Demo project for Spring Boot</description>
16 
17     <properties>
18         <java.version>1.8</java.version>
19         <mysql.version>5.1.44</mysql.version>
20     </properties>
21 
22     <dependencies>
23         <dependency>
24             <groupId>org.springframework.boot</groupId>
25             <artifactId>spring-boot-starter-data-jpa</artifactId>
26         </dependency>
27         <dependency>
28             <groupId>org.springframework.boot</groupId>
29             <artifactId>spring-boot-starter-jdbc</artifactId>
30         </dependency>
31         <dependency>
32             <groupId>org.springframework.boot</groupId>
33             <artifactId>spring-boot-starter-thymeleaf</artifactId>
34         </dependency>
35         <dependency>
36             <groupId>org.springframework.boot</groupId>
37             <artifactId>spring-boot-starter-web</artifactId>
38         </dependency>
39 
40         <dependency>
41             <groupId>mysql</groupId>
42             <artifactId>mysql-connector-java</artifactId>
43             <version>${mysql.version}</version>
44             <scope>runtime</scope>
45         </dependency>
46         <dependency>
47             <groupId>org.projectlombok</groupId>
48             <artifactId>lombok</artifactId>
49             <optional>true</optional>
50         </dependency>
51         <dependency>
52             <groupId>org.springframework.boot</groupId>
53             <artifactId>spring-boot-starter-test</artifactId>
54             <scope>test</scope>
55             <exclusions>
56                 <exclusion>
57                     <groupId>org.junit.vintage</groupId>
58                     <artifactId>junit-vintage-engine</artifactId>
59                 </exclusion>
60             </exclusions>
61         </dependency>
62 
63         <dependency>
64             <groupId>com.alibaba</groupId>
65             <artifactId>druid-spring-boot-starter</artifactId>
66             <version>1.1.10</version>
67         </dependency>
68 
69         <dependency>
70             <groupId>commons-fileupload</groupId>
71             <artifactId>commons-fileupload</artifactId>
72             <version>1.3.1</version>
73         </dependency>
74     </dependencies>
75 
76     <build>
77         <plugins>
78             <plugin>
79                 <groupId>org.springframework.boot</groupId>
80                 <artifactId>spring-boot-maven-plugin</artifactId>
81             </plugin>
82         </plugins>
83     </build>
84 
85 </project>

    配置application.yml

     1 server:
 2   port: 80
 3   servlet:
 4     context-path: /
 5 spring:
 6   jpa:
 7     hibernate:
 8       ddl-auto: update
 9     show-sql: true
10   datasource:
11     #1.JDBC
12     type: com.alibaba.druid.pool.DruidDataSource
13     driver-class-name: com.mysql.jdbc.Driver
14     url: jdbc:mysql://localhost:3306/xufanqi?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
15     username: root
16     password: 123
17     druid:
18       initial-size: 5
19       min-idle: 5
20       max-active: 20
21       max-wait: 60000
22       time-between-eviction-runs-millis: 60000
23       min-evictable-idle-time-millis: 30000
24       validation-query: SELECT 1 FROM DUAL
25       test-while-idle: true
26       test-on-borrow: true
27       test-on-return: false
28       pool-prepared-statements: true
29       max-pool-prepared-statement-per-connection-size: 20
30       filter:
31         stat:
32           merge-sql: true
33           slow-sql-millis: 5000
34       web-stat-filter:
35         enabled: true
36         url-pattern: /*
37         exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
38         session-stat-enable: true
39         session-stat-max-count: 100
40       stat-view-servlet:
41         enabled: true
42         url-pattern: /druid/*
43         reset-enable: true
44         login-username: admin
45         login-password: admin
46         allow: 127.0.0.1
47   thymeleaf:
48     cache: false
49 
50   servlet:
51     multipart:
52       max-file-size: 20MB
53       max-request-size: 60MB

    配置Springboot03Application

     1 package com.javaqi.springboot03;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.transaction.annotation.EnableTransactionManagement;
 6 
 7 @EnableTransactionManagement
 8 @SpringBootApplication
 9 public class Springboot03Application {
10 
11     public static void main(String[] args) {
12         SpringApplication.run(Springboot03Application.class, args);
13     }
14 
15 }

    文件映射配置类MyWebAppConfigurer.java

     1 package com.javaqi.springboot03.config;
 2 
 3 import org.springframework.context.annotation.Configuration;
 4 import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
 5 import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
 6 
 7 /**
 8  * @author XuFanQi
 9  * @site
10  * @company
11  * @create 2019-11-30 17:02
12  */
13 @Configuration
14 public class MyWebAppConfigurer extends WebMvcConfigurationSupport {
15     @Override
16     protected void addResourceHandlers(ResourceHandlerRegistry registry) {
17         registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
18         registry.addResourceHandler("/uploadImages/**").addResourceLocations("file:E:/temp/");
19         super.addResourceHandlers(registry);
20     }
21 }

    StringUtils

     1 package com.javaqi.springboot03.utils;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Arrays;
 5 import java.util.List;
 6 import java.util.Set;
 7 
 8 public class StringUtils {
 9     // 私有的构造方法，保护此类不能在外部实例化
10     private StringUtils() {
11     }
12 
13     /**
14      * 如果字符串等于null或去空格后等于""，则返回true，否则返回false
15      * 
16      * @param s
17      * @return
18      */
19     public static boolean isBlank(String s) {
20         boolean b = false;
21         if (null == s || s.trim().equals("")) {
22             b = true;
23         }
24         return b;
25     }
26     
27     /**
28      * 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
29      * 
30      * @param s
31      * @return
32      */
33     public static boolean isNotBlank(String s) {
34         return !isBlank(s);
35     }
36 
37     /**
38      * set集合转string
39      * @param hasPerms
40      * @return
41      */
42     public static String SetToString(Set hasPerms){
43         return  Arrays.toString(hasPerms.toArray()).replaceAll(" ", "").replace("[", "").replace("]", "");
44     }
45 
46     /**
47      * 转换成模糊查询所需参数
48      * @param before
49      * @return
50      */
51     public static String toLikeStr(String before){
52         return isBlank(before) ? null : "%"+before+"%";
53     }
54 
55     /**
56      *    将图片的服务器访问地址转换为真实存放地址
57      * @param imgpath    图片访问地址（http://localhost:8080/uploadImage/2019/01/26/20190126000000.jpg）
58      * @param serverDir    uploadImage
59      * @param realDir    E:/temp/
60      * @return
61      */
62     public static String serverPath2realPath(String imgpath, String serverDir, String realDir) {
63         imgpath = imgpath.substring(imgpath.indexOf(serverDir));
64         return imgpath.replace(serverDir,realDir);
65     }
66 
67     /**
68      * 过滤掉集合里的空格
69      * @param list
70      * @return
71      */
72     public static List<String> filterWhite(List<String> list){
73         List<String> resultList=new ArrayList<String>();
74         for(String l:list){
75             if(isNotBlank(l)){
76                 resultList.add(l);
77             }
78         }
79         return resultList;
80     }
81 
82     /**
83      * 从html中提取纯文本
84      * @param strHtml
85      * @return
86      */
87     public static String html2Text(String strHtml) {
88         String txtcontent = strHtml.replaceAll("</?[^>]+>", ""); //剔出<html>的标签
89         txtcontent = txtcontent.replaceAll("<a>\s*|	|
|
</a>", "");//去除字符串中的空格,回车,换行符,制表符
90         return txtcontent;
91     }
92 
93     public static void main(String[] args) {
94     }
95 }

    PageUtil

     1 package com.javaqi.springboot03.utils;
 2 
 3 import java.util.Map;
 4 import java.util.Set;
 5 
 6 /**
 7  * 基于bootstrap3生成分页代码
 8  */
 9 public class PageUtil {
10     public static String createPageCode(PageBean pageBean) {
11         StringBuffer sb = new StringBuffer();
12         /*
13          * 拼接向后台提交数据的form表单
14          *     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
15          */
16         sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
17         sb.append("<input type='hidden' name='page'>");
18         Map<String, String[]> parameterMap = pageBean.getParamMap();
19         if(parameterMap != null && parameterMap.size() > 0) {
20             Set<Map.Entry<String, String[]>> entrySet = parameterMap.entrySet();
21             for (Map.Entry<String, String[]> entry : entrySet) {
22                 if(!"page".equals(entry.getKey())) {
23                     String[] values = entry.getValue();
24                     for (String val : values) {
25                         sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");
26                     }
27                 }
28             }
29         }
30         sb.append("</form>");
31 
32         if(pageBean.getTotal()==0){
33             return "未查询到数据";
34         }else{
35             sb.append("<li><a href='javascript:gotoPage(1)'>首页</a></li>");
36             if(pageBean.getPage()>1){
37                 sb.append("<li><a href='javascript:gotoPage("+pageBean.getPreviousPage()+")'>上一页</a></li>");
38             }else{
39                 sb.append("<li class='disabled'><a href='javascript:gotoPage(1)'>上一页</a></li>");
40             }
41             for(int i=pageBean.getPage()-1;i<=pageBean.getPage()+1;i++){
42                 if(i<1||i>pageBean.getMaxPage()){
43                     continue;
44                 }
45                 if(i==pageBean.getPage()){
46                     sb.append("<li class='active'><a href='#'>"+i+"</a></li>");
47                 }else{
48                     sb.append("<li><a href='javascript:gotoPage("+i+")'>"+i+"</a></li>");
49                 }
50             }
51             if(pageBean.getPage()<pageBean.getMaxPage()){
52                 sb.append("<li><a href='javascript:gotoPage("+pageBean.getNextPage()+")'>下一页</a></li>");
53             }else{
54                 sb.append("<li class='disabled'><a href='javascript:gotoPage("+pageBean.getMaxPage()+")'>下一页</a></li>");
55             }
56             sb.append("<li><a href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a></li>");
57         }
58 
59         /*
60          * 给分页条添加与后台交互的js代码
61          */
62         sb.append("<script type='text/javascript'>");
63         sb.append("        function gotoPage(page) {");
64         sb.append("            document.getElementById('pageBeanForm').page.value = page;");
65         sb.append("            document.getElementById('pageBeanForm').submit();");
66         sb.append("        }");
67         sb.append("        function skipPage() {");
68         sb.append("            var page = document.getElementById('skipPage').value;");
69         sb.append("            if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
70         sb.append("                alert('请输入1~N的数字');");
71         sb.append("                return;");
72         sb.append("            }");
73         sb.append("            gotoPage(page);");
74         sb.append("        }");
75         sb.append("</script>");
76         return sb.toString();
77     }
78 }

    PageBean

      1 package com.javaqi.springboot03.utils;
  2 
  3 import javax.servlet.http.HttpServletRequest;
  4 import java.util.Map;
  5 
  6 /**
  7  * 分页工具类
  8  */
  9 public class PageBean {
 10 
 11     private int page = 1;// 页码
 12 
 13     private int rows = 3;// 页大小
 14 
 15     private int total = 0;// 总记录数
 16 
 17     private boolean pagination = true;// 是否分页
 18     
 19 //    保存上次查询的参数
 20     private Map<String, String[]> paramMap;
 21 //    保存上次查询的url
 22     private String url;
 23     
 24     public void setRequest(HttpServletRequest request) {
 25         String page = request.getParameter("page");
 26         String rows = request.getParameter("offset");
 27         String pagination = request.getParameter("pagination");
 28         this.setPage(page);
 29         this.setRows(rows);
 30         this.setPagination(pagination);
 31         this.setUrl(request.getRequestURL().toString());
 32         this.setParamMap(request.getParameterMap());
 33     }
 34 
 35     public PageBean() {
 36         super();
 37     }
 38 
 39     public Map<String, String[]> getParamMap() {
 40         return paramMap;
 41     }
 42 
 43     public void setParamMap(Map<String, String[]> paramMap) {
 44         this.paramMap = paramMap;
 45     }
 46 
 47     public String getUrl() {
 48         return url;
 49     }
 50 
 51     public void setUrl(String url) {
 52         this.url = url;
 53     }
 54 
 55     public int getPage() {
 56         return page;
 57     }
 58 
 59     public void setPage(int page) {
 60         this.page = page;
 61     }
 62     
 63     public void setPage(String page) {
 64         if(StringUtils.isNotBlank(page)) {
 65             this.page = Integer.parseInt(page);
 66         }
 67     }
 68 
 69     public int getRows() {
 70         return rows;
 71     }
 72 
 73     public void setRows(String rows) {
 74         if(StringUtils.isNotBlank(rows)) {
 75             this.rows = Integer.parseInt(rows);
 76         }
 77     }
 78 
 79     public int getTotal() {
 80         return total;
 81     }
 82 
 83     public void setTotal(int total) {
 84         this.total = total;
 85     }
 86 
 87     public void setTotal(String total) {
 88         if(StringUtils.isNotBlank(total)) {
 89             this.total = Integer.parseInt(total);
 90         }
 91     }
 92 
 93     public boolean isPagination() {
 94         return pagination;
 95     }
 96 
 97     public void setPagination(boolean pagination) {
 98         this.pagination = pagination;
 99     }
100     
101     public void setPagination(String pagination) {
102         if(StringUtils.isNotBlank(pagination) && "false".equals(pagination)) {
103             this.pagination = Boolean.parseBoolean(pagination);
104         }
105     }
106     
107     /**
108      * 最大页
109      * @return
110      */
111     public int getMaxPage() {
112         int max = this.total/this.rows;
113         if(this.total % this.rows !=0) {
114             max ++ ;
115         }
116         return max;
117     }
118     
119     /**
120      * 下一页
121      * @return
122      */
123     public int getNextPage() {
124         int nextPage = this.page + 1;
125         if(nextPage > this.getMaxPage()) {
126             nextPage = this.getMaxPage();
127         }
128         return nextPage;
129     }
130     
131     /**
132      * 上一页
133      * @return
134      */
135     public int getPreviousPage() {
136         int previousPage = this.page -1;
137         if(previousPage < 1) {
138             previousPage = 1;
139         }
140         return previousPage;
141     }
142         
143 
144     /**
145      * 获得起始记录的下标
146      * 
147      * @return
148      */
149     public int getStartIndex() {
150         return (this.page - 1) * this.rows;
151     }
152 
153     @Override
154     public String toString() {
155         return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
156     }
157 }

    实体类（自动生成数据库表）

     1 package com.javaqi.springboot03.entity;
 2 
 3 import lombok.ToString;
 4 
 5 import javax.persistence.*;
 6 
 7 @Entity
 8 @Table(name = "t_springboot_teacher")
 9 @ToString
10 public class Teacher {
11     @Id
12     @GeneratedValue
13     private Integer tid;
14     @Column(length = 16)
15     private String tname;
16     @Column(length = 4)
17     private String sex;
18     @Column(length = 100)
19     private String description;
20     @Column(length = 200)
21     private String imagePath;
22 
23     public Integer getTid() {
24         return tid;
25     }
26 
27     public void setTid(Integer tid) {
28         this.tid = tid;
29     }
30 
31     public String getTname() {
32         return tname;
33     }
34 
35     public void setTname(String tname) {
36         this.tname = tname;
37     }
38 
39     public String getSex() {
40         return sex;
41     }
42 
43     public void setSex(String sex) {
44         this.sex = sex;
45     }
46 
47     public String getDescription() {
48         return description;
49     }
50 
51     public void setDescription(String description) {
52         this.description = description;
53     }
54 
55     public String getImagePath() {
56         return imagePath;
57     }
58 
59     public void setImagePath(String imagePath) {
60         this.imagePath = imagePath;
61     }
62 }
    dao层
     1 package com.javaqi.springboot03.repository;
 2 
 3 import com.javaqi.springboot03.entity.Teacher;
 4 import org.springframework.data.jpa.repository.JpaRepository;
 5 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
 6 
 7 /**
 8  * 只要继承JpaRepository，通常所用的增删查改方法都有
 9  *  第一个参数：操作的实体类
10  *  第二个参数：实体类对应数据表的主键
11  *
12  *  要使用高级查询必须继承
13  * org.springframework.data.jpa.repository.JpaSpecificationExecutor<T>接口
14  */
15 public interface TeacherDao extends JpaRepository<Teacher, Integer>, JpaSpecificationExecutor<Teacher> {
16 }
    Service层 
    TeacherService
     1 package com.javaqi.springboot03.service;
 2 
 3 import com.javaqi.springboot03.entity.Teacher;
 4 import com.javaqi.springboot03.utils.PageBean;
 5 import org.springframework.data.domain.Page;
 6 
 7 /**
 8  * @author XuFanQi
 9  * @site
10  * @company
11  * @create 2019-12-01 10:41
12  */
13 public interface TeacherService {
14     public Teacher save(Teacher teacher);
15     public void deleteById(Integer id);
16     public Teacher findById(Integer id);
17     public Page<Teacher> listPager(Teacher teacher, PageBean pageBean);
18 }
    TeacherServiceImpl 
     1 package com.javaqi.springboot03.service.impl;
 2 
 3 import com.javaqi.springboot03.entity.Teacher;
 4 import com.javaqi.springboot03.repository.TeacherDao;
 5 import com.javaqi.springboot03.service.TeacherService;
 6 import com.javaqi.springboot03.utils.PageBean;
 7 import com.javaqi.springboot03.utils.StringUtils;
 8 import org.springframework.beans.factory.annotation.Autowired;
 9 import org.springframework.data.domain.Page;
10 import org.springframework.data.domain.PageRequest;
11 import org.springframework.data.domain.Pageable;
12 import org.springframework.data.jpa.domain.Specification;
13 import org.springframework.stereotype.Service;
14 
15 import javax.persistence.criteria.CriteriaBuilder;
16 import javax.persistence.criteria.CriteriaQuery;
17 import javax.persistence.criteria.Predicate;
18 import javax.persistence.criteria.Root;
19 
20 /**
21  * @author XuFanQi
22  * @site
23  * @company
24  * @create 2019-12-01 10:43
25  */
26 @Service
27 public class TeacherServiceImpl implements TeacherService {
28     @Autowired
29     private TeacherDao teacherDao;
30     @Override
31     public Teacher save(Teacher teacher) {
32         return teacherDao.save(teacher);
33     }
34 
35     @Override
36     public void deleteById(Integer id) {
37         teacherDao.deleteById(id);
38     }
39 
40     @Override
41     public Teacher findById(Integer id) {
42         return teacherDao.findById(id).get();
43     }
44 
45     @Override
46     public Page<Teacher> listPager(Teacher teacher, PageBean pageBean) {
47 //        jpa的Pageable分页是从0页码开始
48         Pageable pageable = PageRequest.of(pageBean.getPage()-1, pageBean.getRows());
49         return teacherDao.findAll(new Specification<Teacher>() {
50             @Override
51             public Predicate toPredicate(Root<Teacher> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
52                 Predicate predicate = criteriaBuilder.conjunction();
53                 if(teacher != null){
54                     if(StringUtils.isNotBlank(teacher.getTname())){
55                         predicate.getExpressions().add(criteriaBuilder.like(root.get("tname"),"%"+teacher.getTname()+"%"));
56                     }
57                 }
58                 return predicate;
59             }
60         },pageable);
61     }
62 }

    controller层

    TeacherController 
     1 package com.javaqi.springboot03.controller;
 2 
 3 import com.javaqi.springboot03.entity.Teacher;
 4 import com.javaqi.springboot03.service.TeacherService;
 5 import com.javaqi.springboot03.utils.PageBean;
 6 import com.javaqi.springboot03.utils.PageUtil;
 7 import com.javaqi.springboot03.utils.StringUtils;
 8 import org.apache.commons.io.FileUtils;
 9 import org.springframework.beans.factory.annotation.Autowired;
10 import org.springframework.data.domain.Page;
11 import org.springframework.stereotype.Controller;
12 import org.springframework.web.bind.annotation.PathVariable;
13 import org.springframework.web.bind.annotation.RequestMapping;
14 import org.springframework.web.multipart.MultipartFile;
15 import org.springframework.web.servlet.ModelAndView;
16 
17 import javax.servlet.http.HttpServletRequest;
18 import java.io.File;
19 import java.io.IOException;
20 
21 
22 @Controller
23 @RequestMapping("/teacher")
24 public class TeacherController {
25     @Autowired
26     private TeacherService teacherService;
27 
28     @RequestMapping("/listPager")
29     public ModelAndView list(Teacher teacher, HttpServletRequest request) {
30         PageBean pageBean = new PageBean();
31         pageBean.setRequest(request);
32         ModelAndView modelAndView = new ModelAndView();
33         Page<Teacher> teachers = teacherService.listPager(teacher, pageBean);
34         modelAndView.addObject("teachers", teachers.getContent());
35         pageBean.setTotal(teachers.getTotalElements() + "");
36         modelAndView.addObject("pageCode", PageUtil.createPageCode(pageBean)/*.replaceAll("<","<").replaceAll("&gt:",">")*/);
37         modelAndView.setViewName("list");
38         return modelAndView;
39     }
40 
41     @RequestMapping("/toEdit")
42     public ModelAndView toEdit(Teacher teacher) {
43         ModelAndView modelAndView = new ModelAndView();
44         modelAndView.setViewName("edit");
45         modelAndView.addObject("sexArr", new String[]{"男", "女"});
46         if (!(teacher.getTid() == null || "".equals(teacher.getTid()))) {
47             Teacher t = teacherService.findById(teacher.getTid());
48             modelAndView.addObject("teacher", t);
49         }
50         return modelAndView;
51     }
52 
53     @RequestMapping("/add")
54     public String add(Teacher teacher, MultipartFile image) {
55         try {
56             String diskPath = "E://temp/" + image.getOriginalFilename();
57             String serverPath = "/uploadImages/" + image.getOriginalFilename();
58             if (StringUtils.isNotBlank(image.getOriginalFilename())) {
59                 FileUtils.copyInputStreamToFile(image.getInputStream(), new File(diskPath));
60                 teacher.setImagePath(serverPath);
61             }
62             teacherService.save(teacher);
63         } catch (IOException e) {
64             e.printStackTrace();
65         }
66         return "redirect:/teacher/listPager";
67     }
68 
69 
70     @RequestMapping("/edit")
71     public String edit(Teacher teacher, MultipartFile image) {
72         String diskPath = "E://temp/" + image.getOriginalFilename();
73         String serverPath = "/uploadImages/" + image.getOriginalFilename();
74         if (StringUtils.isNotBlank(image.getOriginalFilename())) {
75             try {
76                 FileUtils.copyInputStreamToFile(image.getInputStream(), new File(diskPath));
77                 teacher.setImagePath(serverPath);
78             } catch (IOException e) {
79                 e.printStackTrace();
80             }
81         }
82         teacherService.save(teacher);
83         return "redirect:/teacher/listPager";
84     }
85 
86     @RequestMapping("/del/{bid}")
87     public String del(@PathVariable(value = "bid") Integer bid) {
88         teacherService.deleteById(bid);
89         return "redirect:/teacher/listPager";
90     }
91 }

    templates层

    list.html

     1 <!DOCTYPE html>
 2 <html lang="en">
 3 <html xmlns:th="http://www.thymeleaf.org">
 4 <head>
 5     <meta charset="UTF-8">
 6     <title>书籍列表</title>
 7     <script type="text/javascript" th:src="@{/static/js/xxx.js}"></script>
 8     <link rel="stylesheet" th:href="@{/static/js/bootstrap3/css/bootstrap.min.css}">
 9     <link rel="stylesheet" th:href="@{/static/js/bootstrap3/css/bootstrap-theme.min.css}">
10     <script type="text/javascript" th:src="@{/static/js/bootstrap3/js/jquery-1.11.2.min.js}"></script>
11     <script type="text/javascript" th:src="@{/static/js/bootstrap3/js/bootstrap.min.js}"></script>
12 </head>
13 <body>
14 <form th:action="@{/teacher/listPager}" method="post">
15     书籍名称： <input type="text" name="tname" />
16     <input type="submit" value="提交"/>
17 </form>
18 <a th:href="@{/teacher/toEdit}">新增</a>
19 <table border="1px" width="600px">
20     <thead>
21     <tr>
22         <td>ID</td>
23         <td>头像</td>
24         <td>姓名</td>
25         <td>性别</td>
26         <td>简介</td>
27         <td>操作</td>
28     </tr>
29     </thead>
30     <tbody>
31     <tr th:each="teacher : ${teachers}">
32         <td th:text="${teacher.tid}"></td>
33         <td><img style=" 60px;height: 60px;" id="imgshow" th:src="${teacher.imagePath}" th:alt="${teacher.tname}"/></td>
34         <!--<td th:text="${teacher.imagePath}"></td>-->
35         <td th:text="${teacher.tname}"></td>
36         <td th:text="${teacher.sex}"></td>
37         <td th:text="${teacher.description}"></td>
38         <td>
39             <a th:href="@{'/teacher/del/'+${teacher.tid}}">删除</a>
40             <a th:href="@{'/teacher/toEdit?tid='+${teacher.tid}}">修改</a>
41         </td>
42     </tr>
43     </tbody>
44 </table>
45 
46 
47 <nav>
48     <ul class="pagination pagination-sm" th:utext="${pageCode}">
49     </ul>
50 
51     <!--<ul class="pagination pagination-sm">-->
52     <!--<form id='pageBeanForm' action='http://localhost:8080/springboot/teacher/listPager' method='post'><input type='hidden' name='page'></form>-->
53     <!--<li><a href='javascript:gotoPage(1)'>首页</a></li>-->
54     <!--<li class='disabled'><a href='javascript:gotoPage(1)'>上一页</a></li>-->
55     <!--<li class='active'><a href='#'>1</a></li>-->
56     <!--<li><a href='javascript:gotoPage(2)'>2</a></li>-->
57     <!--<li><a href='javascript:gotoPage(2)'>下一页</a></li>-->
58     <!--<li><a href='javascript:gotoPage(4)'>尾页</a></li>-->
59     <!--<script type='text/javascript'>    function gotoPage(page) {    document.getElementById('pageBeanForm').page.value = page; document.getElementById('pageBeanForm').submit();    }    function skipPage() {    var page = document.getElementById('skipPage').value;    if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>4){ alert('请输入1~N的数字');    return;    }    gotoPage(page);    }</script>-->
60     <!--</ul>-->
61 </nav>
62 </body>
63 </html>

    edit.html

     1 <!DOCTYPE html>
 2 <html lang="en">
 3 <html xmlns:th="http://www.thymeleaf.org">
 4 <head>
 5     <meta charset="UTF-8">
 6     <title>用户编辑界面</title>
 7 
 8     <script type="text/javascript">
 9         function preShow() {
10 
11         }
12     </script>
13 </head>
14 <body>
15 
16 <form th:action="@{${teacher.tid} ? '/teacher/edit' : '/teacher/add'}" method="post" enctype="multipart/form-data">
17     <input type="hidden" name="tid" th:value="${teacher.tid}" />
18     <input type="hidden" name="imagePath" th:value="${teacher.imagePath}" />
19     <img id="imgshow" src="" alt=""/>
20     <input type="file" name="image" onchange="preShow();"></br>
21     教员名称： <input type="text" name="tname" th:value="${teacher.tname}" /></br>
22     教员描述： <input type="text" name="description" th:value="${teacher.description}" /></br>
23     单选回显
24     <input type="radio" name="sex"
25            th:each ="s:${sexArr}"
26            th:value="${s}"
27            th:text ="${s}"
28            th:attr ="checked=${s == teacher.sex}">
29 
30     <input type="submit" value="提交"/>
31 </form>
32 
33 </body>
34 </html>

    浏览器访问结果

    新增，查询，分页

     

     
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  • 原文地址：https://www.cnblogs.com/xcn123/p/11965566.html
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