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Struts之增删改查

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导读：本篇文章讲解 Struts之增删改查，希望对大家有帮助，欢迎收藏，转发！站点地址：www.bmabk.com

1、新建maven项目

2、①导入pom.xml依赖，jar依赖；②web.xml改成3.1；③导入struts相关的配置文件

     ④jdk1.5->1.8->同时pom.xml需要添加plugins->plugin;⑤web.2.3->3.1；

     ⑥web.xml中配置核心过滤器StrutsPrepareAndExecuteFilter；

3、导入pom.xml依赖

     导入工具类（com.zking.util、com.zking.tag）

    实体类、dao层、子控制器

新的工具类（BaseAction），出现的现象：

   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

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>{	
	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) {
		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;
	}
	
}

一、Struts的增删改查

1、操作的界面前端代码

①、clzList.jsp

<%@ 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>工作列表</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="${pageContext.request.contextPath }/sy/clz_list.action" method="post">
		<div class="form-group mb-2">
			<input type="text" class="form-control-plaintext" name="job_title"
				placeholder="请输入标题名称">
<!-- 			<input name="rows" value="20" type="hidden"> -->
<!-- 不想分页 -->
				<input name="pagination" value="false" type="hidden">
		</div>
		<button type="submit" class="btn btn-primary mb-2">查询</button>
		<a class="btn btn-primary mb-2" href="${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">班级名字</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>

②、clzEdit.jsp

<%@ 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>工作新增/修改</title>
</head>
<body>
	<form class="fftorm-inline"
		action="${pageContext.request.contextPath }/sy/clz_${empty result ? 'add' : 'edit'}.action" method="post">
		ID：<input type="text" name="cid" value="${result.cid }"><br>
		name：<input type="text" name="cname" value="${result.cname }"><br>
		teacher：<input type="text" name="cteacher" value="${result.cteacher }"><br>
		<input type="submit">
	</form>


</body>
</html>

2、pom.xml导入相关依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.lsy</groupId>
  <artifactId>Lsy_struts</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>Lsy_struts Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <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>
     <javax.servlet-api.version>4.0.1</javax.servlet-api.version>
    <struts2-core.version>2.5.13</struts2-core.version>
  </properties>
  <dependencies>
  
  <dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.5.13</version>
		</dependency>
  
    <dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>${javax.servlet-api.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>${struts2-core.version}</version>
		</dependency>
	<!-- 之前的相关依赖 -->
    <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>
  <build>
    <finalName>Struts</finalName>
    <plugins>
    <plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
		</plugins>
  </build>
</project>

3、实体类

Clz实体类

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;
	}
	
}

4、dao层和子控制器

dao

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 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"});
	}
	
	public void del(Clz t) throws Exception {
		String sql="delete from t_struts_class where cid=?";
		super.executeUpdate(sql, t, new String[] {"cid"});
	}
	
}

子控制器

package com.zking.crud.web;

import com.opensymphony.xwork2.ActionSupport;
import com.zking.crud.dao.ClzDao;
import com.zking.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;
	}
	
	/**
	 * 跳转新增或者修改界面
	 * @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 TOLIST;
	}
	/**
	 * 修改数据
	 * @return
	 * @throws Exception
	 */
	public String edit() throws Exception {
		this.clzDao.edit(clz);
		return TOLIST;
	}
	/**
	 * 删除数据
	 * @return
	 * @throws Exception
	 */
	public String del() throws Exception {
		this.clzDao.del(clz);
		return TOLIST;
	}
	
	@Override
	public Clz getModel() {
		return clz;
	}
	
}

4、struts-sy.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
	"http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
	<package name="sy" extends="base" namespace="/sy">
	<!-- {1}代表第1个* 调后台的哪一个方法-->
	<!-- {2}代表第2个* 调用方法后跳转哪个界面-->
	<action name="/demo1_*" class="com.lsy.one.web.Demo1Action" method="{1}">
		<result name="bookEdit">/bookEdit.jsp</result>
	</action>
	
	<!-- <action name="/demo1_*_*" class="com.lsy.one.web.Demo1Action" method="{1}">
		<result name="{2}">/{2}.jsp</result>
	</action> -->
	<action name="/demo7_*" class="com.lsy.test.Demo7" method="{1}">
		<result name="bookEdit">/bookEdit.jsp</result>
	</action>
	
	<action name="/clz_*" class="com.zking.crud.web.ClzAction" method="{1}">
		<result name="list">/clzList.jsp</result>
		<result name="toEdit">/clzEdit.jsp</result>
		
		<!-- 
		type属性有四个选项
		1.默认的是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="toList" type="redirectAction">/clz_list</result>
	</action>
	
	</package>
</struts>

5、结果界面展示

首页展示

Struts之增删改查

 新增展示

Struts之增删改查

 Struts之增删改查

 修改展示

张三—->张三666

Struts之增删改查

 删除展示

Struts之增删改查

 ok，byebye~

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