Struts之crud（增删改查）

于 2021-10-16 22:46:02 发布
阅读量91 收藏
点赞数
文章标签： struts html
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/qq_53601862/article/details/120805324
版权
本文详细介绍了如何使用Struts实现CRUD（增删改查）功能，包括设置目标、具体实现步骤和代码展示。通过导入相关依赖，创建实体类、DAO和Action类，并调整Struts配置。重点讨论了BaseAction类的作用，它解决了编码问题并简化了子控制器接口的实现。此外，还强调了前端页面数据变量的统一性，以避免因变量不一致导致的错误。

摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 >

一、明确目标：
        1、显示clzlist界面，

        2、将增删改查的功能实现

        3、理解baseAction的作用

二、具体思路、代码以及运行结果：
1、思路：

        1、做好准备工作，导入相关依赖以及工具包：

        2、建立好对应的实体类，dao、以及action类

        3、修改好struts-sy-xml文件中的路径名

2、具体代码：

pom.xml(导入相关依赖)

<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>
 
		<!--添加jar包依赖 -->
		<!--mysql -->
		<mysql.version>8.0.19</mysql.version>
		<!--5.其他 -->
		<junit.version>4.12</junit.version>
		<servlet.version>4.0.0</servlet.version>
		<jackson.version>2.9.3</jackson.version>
		<jstl.version>1.2</jstl.version>
		<standard.version>1.1.2</standard.version>
		<tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version>
		<commons-beanutils.version>1.9.3</commons-beanutils.version>
		<dom4j.version>1.6.1</dom4j.version>
		<jaxen.version>1.1.6</jaxen.version>
		<struts2-core.version>2.5.13</struts2-core.version>
 
 
	</properties>
	<dependencies>
		<dependency>
			<groupId>jaxen</groupId>
			<artifactId>jaxen</artifactId>
			<version>${jaxen.version}</version>
		</dependency>
 
		<dependency>
			<groupId>dom4j</groupId>
			<artifactId>dom4j</artifactId>
			<version>${dom4j.version}</version>
		</dependency>
 
 
		<dependency>
			<groupId>commons-beanutils</groupId>
			<artifactId>commons-beanutils</artifactId>
			<version>${commons-beanutils.version}</version>
		</dependency>
 
		<!--mysql -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.version}</version>
		</dependency>
 
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
 
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>${servlet.version}</version>
			<scope>provided</scope>
		</dependency>
 
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>${jackson.version}</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>${jackson.version}</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-annotations</artifactId>
			<version>${jackson.version}</version>
		</dependency>
 
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>${jstl.version}</version>
		</dependency>
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>${standard.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.tomcat</groupId>
			<artifactId>tomcat-jsp-api</artifactId>
			<version>${tomcat-jsp-api.version}</version>
		</dependency>
 
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>1.18.10</version>
			<scope>provided</scope>
		</dependency>
 
		<dependency>
			<groupId>com.belerweb</groupId>
			<artifactId>pinyin4j</artifactId>
			<version>2.5.0</version>
		</dependency>
 
		<dependency>
			<groupId>com.github.davidcarboni</groupId>
			<artifactId>encrypted-file-upload</artifactId>
			<version>2.1.0</version>
		</dependency>
 
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>${struts2-core.version}</version>
		</dependency>
	</dependencies>

entity：

package com.zking.crud.entity;
 
public class Clz {
	private int cid;
	private String cname;
	private String cteacher;
	private String pic;
 
	public int getCid() {
		return cid;
	}
 
	public void setCid(int cid) {
		this.cid = cid;
	}
 
	public String getCname() {
		return cname;
	}
 
	public void setCname(String cname) {
		this.cname = cname;
	}
 
	public String getCteacher() {
		return cteacher;
	}
 
	public void setCteacher(String cteacher) {
		this.cteacher = cteacher;
	}
 
	public String getPic() {
		return pic;
	}
 
	public void setPic(String pic) {
		this.pic = pic;
	}
 
	@Override
	public String toString() {
		return "ClzDao [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
	}
 
	public Clz(int cid, String cname, String cteacher, String pic) {
		super();
		this.cid = cid;
		this.cname = cname;
		this.cteacher = cteacher;
		this.pic = pic;
	}
 
	public Clz() {
		// TODO Auto-generated constructor stub
	}
 
}

clzDao：

package com.zking.crud.dao;
 
import java.util.List;
 
import com.zking.crud.entity.Clz;
import com.zking.crud.util.BaseDao;
import com.zking.crud.util.PageBean;
 
public class ClzDao extends BaseDao<Clz> {
 
	public List<Clz> list(Clz clz, PageBean pageBean) throws Exception {
		String sql = "select * from t_struts_class where 1=1";
		int cid = clz.getCid();
		if (cid != 0) {
			sql += " and cid=" + cid;
		}
		return super.executeQuery(sql, Clz.class, pageBean);
	}
 
	public void add(Clz t) throws Exception {
		String sql = "insert into t_struts_class values(?,?,?,?)";
		super.executeUpdate(sql, t, new String[] { "cid", "cname", "cteacher", "pic" });
	}
 
	public void del(Clz t) throws Exception {
		String sql = "delete from t_struts_class where cid=?";
		super.executeUpdate(sql, t, new String[] { "cid", });
	}
 
	public void edit(Clz t) throws Exception {
		String sql = "update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
		super.executeUpdate(sql, t, new String[] { "cname", "cteacher", "pic", "cid" });
	}
 
}

在此之前都没有过多改变，但是接下来变化就来了，在clzAction中继承了一个叫做BaseAction的类，这个类的作用：

                            1、解决了编码大小写问题 

 

 

              2、对于每个子控制器都要实现对应的接口request、response

clzAction要继承httpservlertrequest以及httpservlertresponse，但是继承了BaseAction之后就不需要了

clzAvtion：

BaseAction： 

    3、前端页面反映的数据变量不统一

这里直接固定从前台传进来的变量，避免变量不统一而出现的报错

 

BaseAction：

package com.zking.crud.util;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
 
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
 
public abstract class BaseAction<T> extends ActionSupport
		implements ServletRequestAware, ServletResponseAware, ModelDriven<T> {
 
	// 解决了编码时容易出现大小写问题
	protected HttpServletRequest req;
	protected HttpServletResponse resp;
	protected HttpSession session;
	protected static final String LIST = "list";
	protected static final String TOLIST = "toList";
	protected static final String TOEDIT = "toEdit";
 
	// 解决了每个子控制器要拿到Response和Request
	public void setServletResponse(HttpServletResponse arg1) {
		this.resp = arg1;
 
	}
 
	public void setServletRequest(HttpServletRequest arg0) {
		this.req = arg0;
		this.session = arg0.getSession();
	}
 
	// 解决了前台反馈的数据变量不统一
	protected Object result;
	protected String msg;
	protected int code;
 
	public Object getResult() {
		return result;
	}
 
	public void setResult(Object result) {
		this.result = result;
	}
 
	public String getMsg() {
		return msg;
	}
 
	public void setMsg(String msg) {
		this.msg = msg;
	}
 
	public int getCode() {
		return code;
	}
 
	public void setCode(int code) {
		this.code = code;
	}
 
}

 

clzList.jsp:

 代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
	<%@ taglib uri="http://jsp.veryedu.cn"  prefix="z"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>	
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link
	href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
	rel="stylesheet">
<script
	src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script>
<title>博客列表</title>
<style type="text/css">
.page-item input {
	padding: 0;
	width: 40px;
	height: 100%;
	text-align: center;
	margin: 0 6px;
}
 
.page-item input, .page-item b {
	line-height: 38px;
	float: left;
	font-weight: 400;
}
 
.page-item.go-input {
	margin: 0 10px;
}
</style>
</head>
<body>
	<form class="form-inline"
		action="${pageContext.request.contextPath }/sy/clz_list.action" method="post">
		<div class="form-group mb-2">
			<input type="text" class="form-control-plaintext" name="title"
				placeholder="请输入书籍名称">
<!-- 			<input name="rows" value="20" type="hidden"> -->
<!-- 不想分页 -->
				<input name="pagination" value="false" type="hidden">
		</div>
		<button type="submit" class="btn btn-primary mb-2">查询</button>
		<a class="btn btn-primary mb-2" href="${pageContext.request.contextPath }/sy/clz_toEdit.action">新增</a>
	</form>
 
	<table class="table table-striped bg-success">
		<thead>
			<tr>
				<th scope="col">ID</th>
				<th scope="col">名字</th>
				<th scope="col">教员</th>
				<th scope="col">路径</th>
			</tr>
		</thead>
		<tbody>
			<c:forEach  var="b" items="${ result }">
			<tr>
				<td>${b.cid }</td>
				<td>${b.cname }</td>
				<td>${b.cteacher }</td>
				<td>${b.pic }</td>
				
				<td>
					<a href="${pageContext.request.contextPath }/sy/clz_toEdit.action?cid=${b.cid}">修改</a>
					<a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${b.cid}">删除</a>
				</td>
			</tr>
			</c:forEach>
		</tbody>
	</table>
	<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
	<z:page pageBean="${ pageBean }"></z:page>
	
</body>
</html>

 

clzEdit.jsp:

代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib uri="http://jsp.veryedu.cn" prefix="z"%>	
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>	
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link
	href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
	rel="stylesheet">
<script
	src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script>
<title>书籍新增/修改</title>
</head>
<body>
	<form class="form-inline"
		action="${pageContext.request.contextPath }/sy/clz_${empty result ? 'add' : 'edit'}.action" method="post">
		ID：<input type="text" name="cid" value="${result.cid }"><br>
		名字：<input type="text" name="cname" value="${result.cname }"><br>
		教员：<input type="text" name="cteacher" value="${result.cteacher }"><br>
		图片<input type="text" name="pic" value="${result.pic}"><br>
		<input type="submit">
	</form>
 
 
</body>
</html>

 

be honoured.IT
关注
评论
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值