JavaBean_Javabean增删改查_audiencevu9_
![preview](https://csdnimg.cn/release/downloadcmsfe/public/img/white-bg.ca8570fa.png)
![preview-icon](https://csdnimg.cn/release/downloadcmsfe/public/img/scale.ab9e0183.png)
2.虚拟产品一经售出概不退款(资源遇到问题,请及时私信上传者)
![star](https://csdnimg.cn/release/downloadcmsfe/public/img/star.98a08eaa.png)
JavaBean是Java编程中的一种重要概念,主要用于封装数据和业务逻辑,它遵循一定的规范,使得Java对象能够被方便地在Web应用中使用,特别是在Servlet和JSP之间传递数据。在这个项目"JavaBean_Javabean增删改查_audiencevu9_"中,我们将深入探讨如何利用JavaBean来实现用户管理的增删改查功能。 让我们理解JavaBean的基本特性: 1. **公共属性**:JavaBean通常包含一组公开的getter和setter方法,用于访问和修改内部的私有属性。例如,如果有一个User类,它可能有username和password属性,对应的getter和setter方法为getUsername()、setUsername(String username)等。 2. **无参构造器**:JavaBean应提供一个无参数的构造函数,以便于实例化对象。 3. **序列化**:为了支持持久化或跨网络传输,JavaBean可以实现Serializable接口。 在用户管理的场景中,我们通常需要创建一个User类,这个类将包含如ID、用户名、密码、电子邮件等属性。接下来,我们将讨论如何通过Servlet和JSP实现增删改查操作。 **添加(Add)**: - 在Servlet中,用户提交的表单数据可以通过request对象获取,然后使用new User()创建一个新的User对象,并用setter方法设置属性值。 - 调用User类的save()方法(如果存在),将新对象存储到数据库中。 - 重定向或转发到显示结果的JSP页面。 **查询(Query)**: - Servlet接收请求,根据条件(如ID或用户名)从数据库中检索User对象。 - 将查询结果集合通过request.setAttribute()传递到JSP页面。 - JSP使用JSTL或其他标签库遍历集合并显示数据。 **修改(Update)**: - 用户选择要修改的记录,Servlet通过请求参数获取要更新的User ID。 - 查询数据库获取对应User对象,更新属性值。 - 调用update()方法更新数据库中的记录。 - 跳转回显示结果的页面。 **删除(Delete)**: - 用户选择要删除的记录,Servlet接收到删除请求。 - 根据请求参数(如User ID)查找User对象。 - 调用delete()方法从数据库中移除该对象。 - 返回确认删除的页面。 在JSP页面上,通常会使用EL(Expression Language)和JSTL(JavaServer Pages Standard Tag Library)来显示和处理数据。例如,EL可以用于从request或session中获取User对象,而JSTL的form标签则用于构建表单,input标签用于输入数据,command按钮触发表单提交。 这个项目"JavaBean_Javabean增删改查_audiencevu9_"涉及到Web开发的基础知识,包括JavaBean的设计和使用、Servlet的生命周期和请求处理、JSP的页面指令和表达式语言、以及数据库操作。通过实践这些,开发者可以更好地理解和掌握Java Web应用的开发流程。
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![application/x-rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![application/x-zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![application/x-rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![application/x-zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![application/x-rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![package](https://csdnimg.cn/release/downloadcmsfe/public/img/package.f3fc750b.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/JAR.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
- 1
![avatar](https://profile-avatar.csdnimg.cn/ecd6bc855e2445f8bfa3dca96b660438_weixin_42685438.jpg!1)
- 粉丝: 71
- 资源: 4722
我的内容管理 展开
我的资源 快来上传第一个资源
我的收益
登录查看自己的收益我的积分 登录查看自己的积分
我的C币 登录后查看C币余额
我的收藏
我的下载
下载帮助
![voice](https://csdnimg.cn/release/downloadcmsfe/public/img/voice.245cc511.png)
![center-task](https://csdnimg.cn/release/downloadcmsfe/public/img/center-task.c2eda91a.png)
最新资源
- 打包和分发Rust工具.pdf
- SQL中的CREATE LOGFILE GROUP 语句.pdf
- C语言-leetcode题解之第172题阶乘后的零.zip
- C语言-leetcode题解之第171题Excel列表序号.zip
- C语言-leetcode题解之第169题多数元素.zip
- ocr-图像识别资源ocr-图像识别资源
- 图像识别:基于Resnet50 + VGG16模型融合的人体细胞癌症分类模型实现-图像识别资源
- C语言-leetcode题解之第168题Excel列表名称.zip
- C语言-leetcode题解之第167题两数之和II-输入有序数组.zip
- C语言-leetcode题解之第166题分数到小数.zip
![feedback](https://img-home.csdnimg.cn/images/20220527035711.png)
![feedback-tip](https://img-home.csdnimg.cn/images/20220527035111.png)
![dialog-icon](https://csdnimg.cn/release/downloadcmsfe/public/img/green-success.6a4acb44.png)
- 1
- 2
前往页