struts增删改查

程序员文章站 2022-07-01 12:51:08

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利用struts完成增删改查

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.qukang</groupId>
  <artifactId>T226_mvn</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>T226_mvn Maven Webapp</name>
  <url>http://maven.apache.org</url>
  
  <dependencies>
  <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>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>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_mvn</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
标签助手类

package com.qukang.crud.tag;

import java.io.IOException;

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.qukang.crud.uitl.PageBean;


public class PageTag extends BodyTagSupport {

	private static final long serialVersionUID = -3609493782238830873L;
	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 (IOException e) {
			e.printStackTrace();
		}
		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[]> paMap = pageBean.getPaMap();
		if(paMap != null && paMap.size()>0) {
			Set<Entry<String, String[]>> entrySet = paMap.entrySet();
			for (Entry<String, String[]> entry : entrySet) {
//				上一次请求可能携带页码name=page的参数，但是改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，
//				以为这前后请求page对应的值是不一样的，需要单独赋值
				if(!"page".equals(entry.getKey())) {
//					<input type='hidden' name='hobby' value='1'> 
//					<input type='hidden' name='hobby' value='2'> 
//					[1,2]
					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 ");
		sb.append("	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>");
		
		
		
//		拼接分页所需要的js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

<?xml version="1.0" encoding="UTF-8" ?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
	version="2.0">

	<description>zking 1.1 core library</description>
	<display-name>zking core</display-name>
	<tlib-version>1.1</tlib-version>
	<short-name>c</short-name>
	<uri>/zking</uri>


	<tag>
		<!-- 标签库中的标签（类似c:set c:out的定义） -->
		<name>demo</name>
		<!-- 是标签运行具体代码，也就是助手类，下面填写的是助手类的全路径名 -->
		<tag-class>com.qukang.crud.tag.PageTag</tag-class>
		<body-content>JSP</body-content>
		<attribute>
			<!-- 该标签的属性 -->
			<name>pageBean</name>
			<!-- 该属性是否必填 -->
			<required>true</required>
			<!-- 是否支持表达式 -->
			<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.qukang.crud.uitl.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
实体类

package com.qukang.crud.entity;

public class Clazz {
	private int cid;
	private String cname;
	private String cteacher;
	private String pic="暂无图片";
	
	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;
	}
	public Clazz(int cid, String cname, String cteacher, String pic) {
		this.cid = cid;
		this.cname = cname;
		this.cteacher = cteacher;
		this.pic = pic;
	}
	public Clazz() {}
	@Override
	public String toString() {
		return "Calzz [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
	}
	
	
}

dao方法

package com.qukang.crud.dao;

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

import com.qukang.crud.entity.Clazz;
import com.qukang.crud.uitl.BaseDao;
import com.qukang.crud.uitl.PageBean;
import com.qukang.crud.uitl.StringUtils;

public class ClazzDao extends BaseDao<Clazz> {
//	查询方法
	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);
	}
//	增加方法
	public int add(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
		String sql="insert into t_struts_class value(?,?,?,?)";
		return super.executeQuery(sql, new String[]{"cid","cname","cteacher","pic"},clazz);
	}
//	删除方法
	public int del(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
		String sql="delete from t_struts_class where cid=?";
		return super.executeQuery(sql, new String[]{"cid"},clazz);
	}
//	修改反法
	public int edit(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
		String sql="update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
		return super.executeQuery(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.qukang.crud.web;

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

import com.opensymphony.xwork2.ModelDriven;
import com.qukang.crud.dao.ClazzDao;
import com.qukang.crud.entity.Clazz;
import com.qukang.crud.uitl.BaseAction;
import com.qukang.crud.uitl.PageBean;

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("clazzlist",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)
	 */
	public String preSave() {
		if(clz.getCid()!=0) {
			try {
				this.result= this.clazzDao.list(clz,null).get(0);
			} catch (InstantiationException | IllegalAccessException | SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return "preSave";
	}
	public String add() {
		try {
			this.clazzDao.add(clz);
		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
				| SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	
	public String edit() {
		try {
			this.clazzDao.edit(clz);
		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
				| SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "toList";
	}
	public String del() {
		try {
			this.clazzDao.del(clz);
		} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
				| 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="/clz_*" class="com.qukang.crud.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
主界面

<%@page import="java.lang.annotation.Target"%>
<%@ 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="z" %>
<!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>班级主界面</title>
</head>
<body>
<h2>小说目录</h2>
	<br>

	<form action="${pageContext.request.contextPath}/sy/clz_list.action"
		method="post">
		班级名：<input type="text" name="cname"> <input type="submit"
			value="确定">
	<!-- 	<input type="hidden" name="pagination" value="true">
			<input type="hidden" name="rows" value="20"> -->
	</form>
	<a href="${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</td>
			<td>班级图片</td>
			<td>操作</td>
		</tr>
		<c:forEach items="${clazzlist }" var="b">
			<tr>
				<td>${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=${b.cid}">修改</a>
				&nbsp;&nbsp;&nbsp;
				<a href="${pageContext.request.contextPath}/sy/clz_del.action?cid=${b.cid}">删除
				</a>&nbsp;&nbsp;&nbsp;
				<a href="${pageContext.request.contextPath}/sy/clz_preUpload.action?cid=${b.cid}">图片上传
				</a>
				</td>
			</tr>
		</c:forEach>
	</table>
	<z:demo pageBean="${pageBean}"></z:demo>
</body> 
</html>

struts增删改查
增加修改界面

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

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