Struts之crud(增删改查)

其他 2021-12-15 10:56:52 阅读次数: 0

前言：今天要分享的知识是Struts的增删改查

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开发工具:eclipse

 需要的jar包依赖

<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>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>${struts2-core.version}</version>
		</dependency>
    <dependency>
      <groupId>jaxen</groupId>
      <artifactId>jaxen</artifactId>
      <version>${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>
  </dependencies>

由于重点在体现strust的使用，所以很多东西就用之前的，（例如之前的前端页面，帮助类，自定义标签）

实体类 Clz

package com.hpw.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 "Clz [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
	}
	
	
	
	
}

dao

package com.hpw.crud.dao;

import java.util.List;

import com.hpw.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 {
		super.executeUpdate("insert into t_struts_class values(?,?,?,?)", t, new String[] {"cid","cname","cteacher","pic"});
	}
	
	public void edit( Clz t) throws Exception {
		super.executeUpdate("update t_struts_class set cname=?,cteacher=?,pic=? where cid=?", t, new String[] {"cname","cteacher","pic","cid"});
	}
	
	public void del( Clz t) throws Exception {
		super.executeUpdate("delete from t_struts_class where cid = ? )", t, new String[] {"cid"});
	}
}

在clzAction中继承了一个叫做BaseAction的抽象类

作用

1.编码习惯问题，容易出现大小写配置错误

2.每个子控制器都要实现对应接口，拿到request、response对象...

3.向前端页面反馈的数据变量不统一

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;

/**
 * 
 * @author zjjt
 *
 */
public abstract class BaseAction<T> extends ActionSupport implements ServletRequestAware,ServletResponseAware,ModelDriven<T>{
      protected HttpServletRequest req;
      protected HttpServletResponse resp;
      protected HttpSession session;
      
	 //1.编码习惯问题，容易出现大小写配置错误
	 protected static final String LIST = "list";
	 protected static final String TOLIST = "toList";
	 protected static final String TOEDIT = "toEdit";
	 //2.每个子控制器都要实现对应接口，拿到request、response对象...
	
	@Override
	public void setServletResponse(HttpServletResponse arg0) {
		this.resp = arg0;
		
	}
	@Override
	public void setServletRequest(HttpServletRequest arg0) {
		// TODO Auto-generated method stub
		this.req = arg0;
		this.session = arg0.getSession();
	}
	 //3.向前端页面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;
	}
}

web

package com.hpw.crud.web;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.hpw.crud.dao.ClzDao;
import com.hpw.crud.entity.Clz;
import com.zking.crud.util.BaseAction;
import com.zking.crud.util.PageBean;

public class ClzAction extends BaseAction<Clz> {

	private Clz clz = new Clz();
	private ClzDao clzDao = new ClzDao();

	/**
	 * 查询班级列表
	 * 
	 * @return
	 * @throws Exception
	 */
	public String list() throws Exception {
		PageBean pageBean = new PageBean();
		pageBean.setRequest(req);
		this.result = this.clzDao.list(clz, pageBean);
		this.req.setAttribute("result", result);
		this.req.setAttribute("pageBean", pageBean);
		return LIST;
	}

	/**
	 * 跳转新增/修改界面
	 * 
	 * @return
	 * @throws Exception
	 */
	public String toEdit() throws Exception {
		int cid = clz.getCid();
		if(cid != 0) {
			this.result = this.clzDao.list(clz, null).get(0);
			this.req.setAttribute("result", result);
		}
		return TOEDIT;
	}

	/**
	 * 往数据库新增数据
	 * 
	 * @return
	 * @throws Exception
	 */
	public String add() throws Exception {
		this.clzDao.add(clz);
		return TOEDIT;
	}

	/**
	 * 修改数据
	 * 
	 * @return
	 * @throws Exception
	 */
	public String edit() throws Exception {
		this.clzDao.edit(clz);
		return TOEDIT;
	}

	/**
	 * 删除数据
	 * 
	 * @return
	 * @throws Exception
	 */
	public String del() throws Exception {
		this.clzDao.del(clz);
		return TOEDIT;
	}

	@Override
	public Clz getModel() {
		// TODO Auto-generated method stub
		return clz;
	}

}

配置到strust-sy.xml中

<package name="sy" extends="base" namespace="/sy">
<action name="/clz_*" class="com.hpw.crud.web.ClzAction"
			method="{1}">
			<!-- 
			/clz.action?methodName=list 
			type有四个选项
			1.默认forward 标签体对应的转发页面
			2.action:标签体对应的转发的action后台方法
			3.redirect:标签体对应的重定向页面
			4.redirectAction:标签体对应的重定向Action后台方法
			-->
			<result name="list">/clzList.jsp</result>
			<result name="toEdit">/clzEdit.jsp</result>
			
			<result name="toList" type="redirectAction">/clz_list</result>
		</action>
	</package>

前端门面

<%@ 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>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="请输入名称">
<!-- 			<input name="rows" value="20" type="hidden"> -->
<!-- 不想分页 -->
	
		</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">图片</th>
				<th scope="col">操作</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>

增加and修改界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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">
<title>的编辑界面</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/sy/clz_${empty result? 'add' : 'edit'}.action" method="post">
id:<input type="text" name="cid" value="${result.cid }"><br>
title:<input type="text" name="cname" value="${result.cname }"><br>
cteacher:<input type="text" name="cteacher" value="${result.cteacher}"><br>
<input type="submit">
</form>
</body>
</html>

效果展示

展示数据

 增加界面

修改界面 

 

 

strust与mvc框架用法相似不同的在与配置文件和web层的方法使用 

到这里就结束了，欢迎大佬指点 

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