struts2之增删改查

最新推荐文章于 2020-03-26 22:48:27 发布

原创最新推荐文章于 2020-03-26 22:48:27 发布 · 201 阅读

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CC 4.0 BY-SA版权

本文详细介绍了如何使用Struts2框架搭建项目，包括Maven依赖配置、自定义分页标签的实现、DAO层数据访问、Web层业务逻辑处理以及视图层展示。通过具体实例，展示了Struts2在MVC架构中的应用。

思路：

1、导入相关的pom依赖（struts、自定义标签库的依赖）

<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.zking</groupId>
	<artifactId>T226_struts</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>T226_struts Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>4.0.1</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.5.13</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.44</version>
		</dependency>

		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.5.20</version>
		</dependency>

		<!-- 5.3、jstl、standard -->
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>

		<!-- 5.4、tomcat-jsp-api -->
		<dependency>
			<groupId>org.apache.tomcat</groupId>
			<artifactId>tomcat-jsp-api</artifactId>
			<version>8.0.47</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>T226_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>

2、分页的tag类导入、z.tld、完成web.xml的配置

tag类

package com.likang.tag;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;

import com.likang.util.PageBean;

public class PageTag extends BodyTagSupport{

	
	
	private static final long serialVersionUID = 7368553516089102132L;
	private PageBean pageBean;

	public PageBean getPageBean() {
		return pageBean;
	}

	public void setPageBean(PageBean pageBean) {
		this.pageBean = pageBean;
	}
	@Override
	public int doStartTag() throws JspException {
		JspWriter out=pageContext.getOut();
		try {
			out.print(toHTML());
		} catch (Exception e) {
			// TODO: handle exception
		}
		
		return super.doStartTag();
	}

	private String toHTML() {
		StringBuilder sb=new StringBuilder();
		//拼接下一次发送请求所要提交的隐藏的form表单		
		sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'> ");
		sb.append("<input type='hidden' name='page'> ");
		Map<String, String[]> prMap = pageBean.getPrMap();
		if(prMap != null && prMap.size()>0) {
			Set<Entry<String,String[]>> entrySet = prMap.entrySet();
			for (Entry<String, String[]> entry : entrySet) {
				//上一次可能携带页码name=page的参数，但是该参数在前面已经单独赋值
				//为什么要单独赋值呢？因为上一次请求是第一页的数据，下一次可能是第二页
				//所有这前后请求page对应的值是不一样的，需要单独赋值
				if(!"page".equals(entry.getKey())) {
					for(String val:entry .getValue()) {
						sb.append("<input type='hidden' name='"+entry.getKey()+"'  value='"+val+"' > ");
					}
				}
			}
		}
		sb.append("</form>");

		
		//拼接分页条
		
		sb.append("<div style='text-align: right; font-size: 12px;'> ");
		sb.append("每页"+pageBean.getRows()+"条，共"+pageBean.getTotal()+"条，第"+pageBean.getPage()+"页，共"+pageBean.getMaxPage()+"页&nbsp;&nbsp;<a href='javascript:gotoPage(1)'>首页</a>&nbsp;&nbsp;<a   ");
		sb.append(" href='javascript:gotoPage("+pageBean.getPreviousPage()+")'>上一页</a>&nbsp;&nbsp;<a");
		sb.append(" href='javascript:gotoPage("+pageBean.getNextPage()+")'>下一页</a>&nbsp;&nbsp;<a");
		sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a>&nbsp;&nbsp;<input type='text'");
		sb.append(" id='skipPage'");
		sb.append(" style='text-align: center; font-size: 12px; width: 50px;'>&nbsp;&nbsp;<a");
		sb.append(" href='javascript:skipPage()'>Go</a>");
		sb.append(" </div>");

		
		//拼接所需要的jsp代码
		sb.append(" <script type='text/javascript'>");
		sb.append(" function gotoPage(page) { ");
		sb.append(" document.getElementById('pageBeanForm').page.value = page;");
		sb.append(" document.getElementById('pageBeanForm').submit();");
		sb.append(" }");
		sb.append(" function skipPage() {");
		sb.append(" var page = document.getElementById('skipPage').value;");
		sb.append(" if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
		
		sb.append(" alert('请输入1~N的数字');");
		sb.append(" return;");
		sb.append(" }");
		sb.append(" gotoPage(page);");
		sb.append("	}");
		sb.append(" </script>");
	
		
		
		return sb.toString();
	}
}

z.tld

<!DOCTYPE taglib
  PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
   "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<!-- 标签库描述符 -->
<taglib xmlns="http://java.sun.com/JSP/TagLibraryDescriptor">
	<tlib-version>1.0</tlib-version>
	<jsp-version>1.2</jsp-version>
	<short-name>Simple Tags</short-name>
	<uri>/zking</uri>
	
	
	<tag>
		<name>page</name>
		<tag-class>com.likang.tag.PageTag</tag-class>
		<body-content>empty</body-content>
		<attribute>
			<name>pageBean</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
		</attribute>
	</tag>
	
</taglib>

web.xml

<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>encodingFiter</filter-name>
  <filter-class>com.likang.util.EncodingFiter</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>encodingFiter</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
  <filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
  <url-pattern>*.action</url-pattern>
  </filter-mapping>
</web-app>

3、dao层去访问数据

package com.likang.dao;

import java.sql.SQLException;
import java.util.List;

import com.likang.entity.Clazz;
import com.likang.util.BaseDao;
import com.likang.util.PageBean;
import com.likang.util.StringUtils;

public class ClazzDao extends BaseDao<Clazz>{

	public List<Clazz> list(Clazz clazz,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
		String sql="select * from t_struts_class where true ";
		String cname=clazz.getCname();
		int cid=clazz.getCid();
		if(cid!=0) {
			sql +=" and cid="+cid;
		}
		if(StringUtils.isNotBlank(cname)) {
			sql += " and cname like '%"+cname+"%' ";
		}
		return super.executeQuery(sql, Clazz.class, pageBean);
	}
	
	
	public int add(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, InstantiationException, SQLException {
		String sql= " insert into t_struts_class values(?,?,?,?) ";
		return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz);
	}
	public int del(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, InstantiationException, SQLException {
		String sql= " delete from t_struts_class where cid=? ";
		return super.executeUpdate(sql, new String[] {"cid"}, clazz);
	}
	
	public int edit(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, InstantiationException, SQLException {
		String sql= " update t_struts_class set cname=?,cteacher=?,pic=? where cid=? ";
		return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clazz);
	}
}

4、web层去调用dao层给前台返回数据

package com.likang.web;

import java.sql.SQLException;
import java.util.List;

import com.likang.dao.ClazzDao;
import com.likang.entity.Clazz;
import com.likang.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;

public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

	private Clazz clz=new Clazz();
	private ClazzDao clazzDao=new ClazzDao();
	
	public String list() {
		PageBean pageBean=new PageBean();
		pageBean.setRequest(request);
		try {
			List<Clazz> list = this.clazzDao.list(clz, pageBean);
			request.setAttribute("clzList", list);
			request.setAttribute("pageBean", pageBean);
		} catch (InstantiationException | IllegalAccessException | SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "list";
	}
	/**
	 * 跳转编辑页面（新增修改页面）
	 * @return
	 */
	public String preSave() {
		if(clz.getCid() !=0 ) {
			try {
				this.result= this.clazzDao.list(clz, null).get(0);
			} catch (InstantiationException | IllegalAccessException | SQLException e) {
				e.printStackTrace();
			}
		}
		return "preSave";
	}
	public String add() {
		try {
			this.code=this.clazzDao.add(clz);
		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
				| InstantiationException | SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	public String edit() {
		try {
			this.clazzDao.edit(clz);
		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
				| InstantiationException | SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	public String del() {
		try {
			this.clazzDao.del(clz);
		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
				| InstantiationException | SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	
	
	@Override
	public Clazz getModel() {
		// TODO Auto-generated method stub
		return clz;
	}
	
}

5、在struts_sy.xml进行配置

<?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">
		<action name="/hello_*" class="com.likang.HelloAction" method="{1}">
			<result name="success">/success.jsp</result>
		</action>


		<action name="/clz_*" class="com.likang.web.ClazzAction" method="{1}">
			<result name="list">/clzlist.jsp</result>
			<result name="preSave">/clzedit.jsp</result>
			<result name="toList" type="redirectAction">clz_list</result>
			
			
		</action>
	</package>
</struts>

6、写jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
       <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
   <%@ taglib uri="/zking"  prefix="k" %>
<!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>班级主页面</title>
</head>
<body>
	<h2>小说目录</h2>
	<br>

	<form action="${pageContext.request.contextPath}/sy/clz_list.action"
		method="post">
		书名：<input type="text" name="cname"> <input type="submit"
			value="确定">
			<!--  <input type="hidden"  name="pagination" value="false">
			<input type="hidden"  name="page" value="20"> -->
	</form>
	<a href="${pageContext.request.contextPath}/sy/clz_preSave.action">增加</a>
	<table border="1" width="100%">
		<tr>
			<td>编号</td>
			<td>班级名称</td>
			<td>教员名称</td>
			<td>图片</td>
			<td>操作</td>
		</tr>
		<c:forEach items="${clzList }" var="b">
			<tr>
				<td>${b.cid }</td>
				<td>${b.cname }</td>
				<td>${b.cteacher }</td>
				<td>${b.pic }</td>
				<td><a href="${pageContext.request.contextPath}/sy/clz_preSave.action?cid=${b.cid}">修改</a>&nbsp;&nbsp;&nbsp;</td>
<td><a href="${pageContext.request.contextPath}/sy/clz_del.action?cid=${b.cid}">删除</a>&nbsp;&nbsp;&nbsp;</td>

			</tr>
		</c:forEach>
	</table>

		<k:page pageBean="${pageBean }"></k:page>


</body>
</html>

<%@ 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>班级编辑界面</title>
</head>
<body>
	<form
		action="${pageContext.request.contextPath}/sy/${result.cname == null ? 'clz_add.action': 'clz_edit.action' }"
		method="post">
		班级ID:<input type="text" name="cid" value="${result.cid }">

		班级名称:<input type="text" name="cname" value="${result.cname }">

		教员名称:<input type="text" name="cteacher" value="${result.cteacher }">
		<input type="submit" value="提交">
	</form>
</body>
</html>

结果如下
在这里插入图片描述