一、Struts的增删改查

导入jar包相关依赖：

<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.lgs</groupId>
  <artifactId>T269G_struts</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>T269G_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>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>
 
    <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>T269G_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>

 配置过滤器和导入相关xml配置和相关工具类：

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <display-name>Archetype Created Web Application</display-name>
  
<filter>
		<filter-name>struts</filter-name>
		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts</filter-name>
		<url-pattern>*.action</url-pattern>
	</filter-mapping>
 
</web-app>

 

 
实体类 ：

package com.dzl.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方法:

package com.dzl.crud.dao;
 
import java.util.List;
 
import com.dzl.crud.entity.Clz;
import com.dzl.crud.util.BaseDao;
import com.dzl.crud.util.PageBean;
import com.dzl.crud.util.StringUtils;
 
public class ClzDao extends BaseDao<Clz>{
 
	/**
	 * 查询
	 */
	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;
		}
		String cname = clz.getCname();
		if(StringUtils.isNotBlank(cname)) {
			sql += " and cname like '%"+cname+"%'";
		}
		return super.executeQuery(sql, Clz.class, pageBean);
	}
	
	/**
	 * 新增
	 */
	public void add(Clz clz) throws Exception {
		String sql = "insert into t_struts_class values(?,?,?,?)";
		super.executeUpdate(sql, clz, new String[] {"cid","cname","cteacher","pic"});
	}
	
	/**
	 * 删除
	 */
	public void del(Clz clz) throws Exception {
		String sql = "delete from t_struts_class where cid=?";
		super.executeUpdate(sql, clz, new String[] {"cid"});
	}
	
	/**
	 * 修改
	 */
	public void edit(Clz clz) throws Exception {
		String sql = "update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
		super.executeUpdate(sql, clz, new String[] {"cname","cteacher","pic","cid"});
	}
 
}

子控制器帮助类:

package com.dzl.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.设置编码常量，防止出现大小写错误
	protected static final String LIST = "list";
	protected static final String TOLIST = "toList";
	protected static final String TOEDIT = "toEdit";
 
//	2.对于Tomcat集成常用对象进行统一管理
	public void setServletResponse(HttpServletResponse arg0) {
		this.resp = arg0;
	}
 
	public void setServletRequest(HttpServletRequest arg0) {
		this.req = arg0;
		this.session = arg0.getSession();
	}
	
//	3.封装了携带到页面的常量
	protected Object result;
	protected Object msg;
	protected int code;
	
	public Object getResult() {
		return result;
	}
 
	public void setResult(Object result) {
		this.result = result;
	}
 
	public Object getMsg() {
		return msg;
	}
 
	public void setMsg(Object msg) {
		this.msg = msg;
	}
 
	public int getCode() {
		return code;
	}
 
	public void setCode(int code) {
		this.code = code;
	}
	
}

子控制器：

package com.dzl.crud.web;
 
import com.dzl.crud.dao.ClzDao;
import com.dzl.crud.entity.Clz;
import com.dzl.crud.util.BaseAction;
import com.dzl.crud.util.PageBean;
 
public class ClzAction extends BaseAction<Clz> {
 
	private Clz clz = new Clz();
	private ClzDao clzDao = new ClzDao();
 
	public Clz getModel() {
		return clz;
	}
 
	/**
	 * 查询班级列表
	 */
	public String list() throws Exception {
		PageBean pageBean = new PageBean();
		pageBean.setRequest(req);
		pageBean.setRows(4);
		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
	 */
	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;
	}
 
	/**
	 * 往数据库中新增数据
	 */
	public String add() throws Exception {
		this.clzDao.add(clz);
		return TOLIST;
	}
 
	/**
	 * 删除数据
	 */
	public String del() throws Exception {
		this.clzDao.del(clz);
		return TOLIST;
	}
 
	/**
	 * 修改数据
	 */
	public String edit() throws Exception {
		this.clzDao.edit(clz);
		return TOLIST;
	}
 
}

配置子控制器：

	<!-- 
	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
	4.redirectAction标签体对应的重定向action后台方法
	 -->
	<action name="/clz_*" class="com.dzl.crud.web.ClzAction" method="{1}">
	<result name="list">/clzList.jsp</result>
	<result name="toEdit">/clzEdit.jsp</result>
	<result name="toList" type="redirectAction">/clz_list</result>
	</action> 

主界面:

<%@ 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>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="${pageContext.request.contextPath }/sy/clz_list.action" method="post">
		<div class="form-group mb-2">
			<input type="text" class="form-control-plaintext" name="cname"placeholder="请输入班级名称">
			<!--<input name="rows" value="20" type="hidden"> -->
<!-- 不想分页 -->
			<input name="pagination" value="false" type="hidden">
		</div>
		<button type="submit" class="btn btn-primary mb-2">查询</button>
		<a class="btn btn-primary mb-2" href="${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">班级姓名</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="j" items="${result }">
			<tr>
				<td>${j.cid }</td>
				<td>${j.cname }</td>
				<td>${j.cteacher }</td>
				<td>${j.pic }</td>
				<td>
					<a href="${pageContext.request.contextPath }/sy/clz_toEdit.action?cid=${j.cid}">修改</a>
					<a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${j.cid}">删除</a>
				</td>
			</tr>
			</c:forEach>
		</tbody>
	</table>
	<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
	<z:page pageBean="${pageBean }"></z:page>
</body>
</html>

增加和修改界面 :

<%@ 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>Insert title here</title>
</head>
<body>
	<form action="${pageContext.request.contextPath }/sy/clz_${empty result ? 'add' : 'edit'}.action" method="post">
		ID：<input type="text" name="cid" value="${result.cid }"><br>
		班级姓名：<input type="text" name="cname" value="${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>

运行结果：