<input type="hidden" name="bind" value="2" /> 解释一下这段代码
时间: 2024-02-10 21:09:29 浏览: 22
这段代码是一个HTML表单中的一部分。其中,`<input>`标签用于创建一个输入字段,`type="hidden"`表示该输入字段是隐藏的,用户无法看到或编辑它。`name="bind"`是该输入字段的名称,`value="2"`是该输入字段的值。这段代码的作用是将一个名为"bind"的隐藏字段添加到表单中,并将其值设置为"2"。
相关问题
用SSM实现图书管理系统的图书类型管理模块用代码写出
以下是使用SSM框架实现图书管理系统的图书类型管理模块的代码示例:
1. 对应的Mapper接口:BookTypeMapper.java
```java
package com.example.demo.mapper;
import com.example.demo.pojo.BookType;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;
@Mapper
public interface BookTypeMapper {
int insert(BookType record);
int insertSelective(BookType record);
int updateByPrimaryKeySelective(BookType record);
int updateByPrimaryKey(BookType record);
int deleteByPrimaryKey(Integer id);
List<BookType> selectAllBookTypes();
BookType selectByPrimaryKey(Integer id);
List<BookType> selectBookTypesByKeyword(@Param("keyword") String keyword);
}
```
2. 对应的Service接口:BookTypeService.java
```java
package com.example.demo.service;
import com.example.demo.pojo.BookType;
import java.util.List;
public interface BookTypeService {
int addBookType(BookType bookType);
int updateBookType(BookType bookType);
int deleteBookType(Integer id);
List<BookType> getAllBookTypes();
BookType getBookTypeById(Integer id);
List<BookType> getBookTypesByKeyword(String keyword);
}
```
3. 对应的Service实现类:BookTypeServiceImpl.java
```java
package com.example.demo.service.impl;
import com.example.demo.mapper.BookTypeMapper;
import com.example.demo.pojo.BookType;
import com.example.demo.service.BookTypeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class BookTypeServiceImpl implements BookTypeService {
@Autowired
private BookTypeMapper bookTypeMapper;
@Override
public int addBookType(BookType bookType) {
return bookTypeMapper.insertSelective(bookType);
}
@Override
public int updateBookType(BookType bookType) {
return bookTypeMapper.updateByPrimaryKeySelective(bookType);
}
@Override
public int deleteBookType(Integer id) {
return bookTypeMapper.deleteByPrimaryKey(id);
}
@Override
public List<BookType> getAllBookTypes() {
return bookTypeMapper.selectAllBookTypes();
}
@Override
public BookType getBookTypeById(Integer id) {
return bookTypeMapper.selectByPrimaryKey(id);
}
@Override
public List<BookType> getBookTypesByKeyword(String keyword) {
return bookTypeMapper.selectBookTypesByKeyword(keyword);
}
}
```
4. 对应的Controller类:BookTypeController.java
```java
package com.example.demo.controller;
import com.example.demo.pojo.BookType;
import com.example.demo.service.BookTypeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@Controller
@RequestMapping("/bookType")
public class BookTypeController {
@Autowired
private BookTypeService bookTypeService;
@GetMapping("/list")
public String list(Model model) {
List<BookType> bookTypes = bookTypeService.getAllBookTypes();
model.addAttribute("bookTypes", bookTypes);
return "bookType/list";
}
@GetMapping("/add")
public String add(Model model) {
model.addAttribute("bookType", new BookType());
return "bookType/add";
}
@PostMapping("/add")
public String add(BookType bookType) {
bookTypeService.addBookType(bookType);
return "redirect:/bookType/list";
}
@GetMapping("/update/{id}")
public String update(@PathVariable("id") Integer id, Model model) {
BookType bookType = bookTypeService.getBookTypeById(id);
model.addAttribute("bookType", bookType);
return "bookType/update";
}
@PostMapping("/update")
public String update(BookType bookType) {
bookTypeService.updateBookType(bookType);
return "redirect:/bookType/list";
}
@GetMapping("/delete/{id}")
public String delete(@PathVariable("id") Integer id) {
bookTypeService.deleteBookType(id);
return "redirect:/bookType/list";
}
@GetMapping("/search")
public String search(@RequestParam(value = "keyword", required = false) String keyword, Model model) {
List<BookType> bookTypes;
if (keyword == null || keyword.equals("")) {
bookTypes = bookTypeService.getAllBookTypes();
} else {
bookTypes = bookTypeService.getBookTypesByKeyword(keyword);
}
model.addAttribute("bookTypes", bookTypes);
return "bookType/list";
}
}
```
5. 对应的页面文件:list.html、add.html、update.html
list.html:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图书类型管理</title>
</head>
<body>
<h1>图书类型管理</h1>
<a href="/bookType/add">添加图书类型</a>
<form action="/bookType/search" method="get">
<input type="text" name="keyword" placeholder="请输入关键字">
<button type="submit">搜索</button>
</form>
<table border="1">
<tr>
<th>编号</th>
<th>名称</th>
<th>描述</th>
<th>操作</th>
</tr>
<tr th:each="bookType : ${bookTypes}">
<td th:text="${bookType.id}"></td>
<td th:text="${bookType.name}"></td>
<td th:text="${bookType.description}"></td>
<td>
<a th:href="@{/bookType/update/{id}(id=${bookType.id})}">修改</a>
<a th:href="@{/bookType/delete/{id}(id=${bookType.id})}" onclick="return confirm('确认删除?')">删除</a>
</td>
</tr>
</table>
</body>
</html>
```
add.html:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>添加图书类型</title>
</head>
<body>
<h1>添加图书类型</h1>
<form action="/bookType/add" method="post">
<label for="name">名称:</label>
<input type="text" id="name" name="name" required>
<br>
<label for="description">描述:</label>
<textarea id="description" name="description"></textarea>
<br>
<button type="submit">提交</button>
</form>
<a href="/bookType/list">返回列表</a>
</body>
</html>
```
update.html:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>修改图书类型</title>
</head>
<body>
<h1>修改图书类型</h1>
<form action="/bookType/update" method="post">
<input type="hidden" name="id" th:value="${bookType.id}">
<label for="name">名称:</label>
<input type="text" id="name" name="name" th:value="${bookType.name}" required>
<br>
<label for="description">描述:</label>
<textarea id="description" name="description" th:text="${bookType.description}"></textarea>
<br>
<button type="submit">提交</button>
</form>
<a href="/bookType/list">返回列表</a>
</body>
</html>
```
springboot实现首页轮播图并在另一页面对轮播图进行增删改查后首页轮播图更新的代码
以下是使用Spring Boot实现首页轮播图并在另一页面对轮播图进行增删改查后首页轮播图更新的代码示例:
1. 创建数据库表结构:
```sql
CREATE TABLE `biz_slideshow` (
`id` int(11) NOT NULL COMMENT 'id',
`img_url` varchar(255) DEFAULT NULL COMMENT '图片地址',
`sort` int(11) DEFAULT NULL COMMENT '显示顺序',
`type` varchar(2) DEFAULT NULL COMMENT '类型(扩展不同模块拥有轮播图:首页、商品、个人信息)',
`description` varchar(255) DEFAULT NULL COMMENT '图片描述(扩展)',
`create_time` datetime DEFAULT NULL COMMENT '创建时间',
PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT='轮播图信息表';
```
2. 创建实体类 Slideshow.java:
```java
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Slideshow {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String imgUrl;
private Integer sort;
private String type;
private String description;
private LocalDateTime createTime;
// 省略构造方法、getter和setter
}
```
3. 创建轮播图数据访问接口 SlideshowRepository.java:
```java
import org.springframework.data.jpa.repository.JpaRepository;
public interface SlideshowRepository extends JpaRepository<Slideshow, Long> {
// 可自定义查询方法,如根据类型查询轮播图
}
```
4. 创建轮播图服务类 SlideshowService.java:
```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class SlideshowService {
private final SlideshowRepository slideshowRepository;
@Autowired
public SlideshowService(SlideshowRepository slideshowRepository) {
this.slideshowRepository = slideshowRepository;
}
public List<Slideshow> getAllSlideshows() {
return slideshowRepository.findAll();
}
public Slideshow saveSlideshow(Slideshow slideshow) {
return slideshowRepository.save(slideshow);
}
public void deleteSlideshow(Long id) {
slideshowRepository.deleteById(id);
}
// 可根据需要添加其他操作方法,如更新轮播图
}
```
5. 创建控制器类 SlideshowController.java:
```java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/slideshow")
public class SlideshowController {
private final SlideshowService slideshowService;
@Autowired
public SlideshowController(SlideshowService slideshowService) {
this.slideshowService = slideshowService;
}
@GetMapping("/")
public List<Slideshow> getAllSlideshows() {
return slideshowService.getAllSlideshows();
}
@PostMapping("/")
public Slideshow saveSlideshow(@RequestBody Slideshow slideshow) {
return slideshowService.saveSlideshow(slideshow);
}
@DeleteMapping("/{id}")
public void deleteSlideshow(@PathVariable Long id) {
slideshowService.deleteSlideshow(id);
}
// 可根据需要添加其他操作方法,如更新轮播图
}
```
6. 在首页页面中使用轮播图数据:
```html
<!-- 在页面中显示轮播图 -->
<div id="slideshow">
<!-- 使用轮播图数据渲染 -->
<div th:each="slideshow : ${slideshows}">
<img th:src="${slideshow.imgUrl}" alt="Slideshow Image">
<p th:text="${slideshow.description}"></p>
</div>
</div>
```
7. 在另一页面中对轮播图进行增删改查:
```html
<!-- 添加轮播图 -->
<form action="/slideshow/" method="post">
<input type="text" name="imgUrl" placeholder="图片地址">
<input type="number" name="sort" placeholder="显示顺序">
<input type="text" name="type" placeholder="类型">
<input type="text" name="description" placeholder="图片描述">
<button type="submit">添加轮播图</button>
</form>
<!-- 删除轮播图 -->
<form action="/slideshow/{id}" method="post">
<input type="hidden" name="_method" value="delete">
<button type="submit">删除轮播图</button>
</form>
<!-- 更新轮播图 -->
<form action="/slideshow/{id}" method="post">
<input type="hidden" name="_method" value="put">
<input type="text" name="imgUrl" placeholder="图片地址">
<input type="number" name="sort" placeholder="显示顺序">
<input type="text" name="type" placeholder="类型">
<input type="text" name="description" placeholder="图片描述">
<button type="submit">更新轮播图</button>
</form>
<!-- 查询轮播图 -->
<a href="/slideshow/">查询轮播图</a>
```
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