Struts2-----增删改查

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）
2、分页的tag类导入、z.tld、完成web.xml的配置
3、dao层去访问数据
4、web层去调用dao层给前台返回数据
5、在struts_sy.xml进行配置
6、写jsp页面

---

pom依赖

<!-- 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>

分页的tag类导入、z.tld（因为今天主要讲的是Struts的增删改查  对于分页就不多赘述了）

PageTag:

package com.psy.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.psy.crud.util.PageBean;

public class PageTag extends BodyTagSupport {

	private static final long serialVersionUID = 1L;
	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) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return super.doStartTag();
	}
	private String toHTML() {
		StringBuffer sb = new StringBuffer();
		/*
		 * 拼接向后台提交数据的form表单
		 * 	注意：拼接的form表单中的page参数是变化的，所以不需要保留上一次请求的值
		 */
		sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
		sb.append("<input type='hidden' name='page'>");
		Map<String, String[]> parameterMap = pageBean.getParameterMap();
		if(parameterMap != null && parameterMap.size() > 0) {
			Set<Entry<String, String[]>> entrySet = parameterMap.entrySet();
			for (Entry<String, String[]> entry : entrySet) {
				if(!"page".equals(entry.getKey())) {
					String[] values = entry.getValue();
					for (String val : values) {
						sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");
					}
				}
			}
		}
		sb.append("</form>");
		
		/*
		 * 展示的分页条
		 */
		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  <a href='javascript:gotoPage(1)'>首页</a>  <a");
		sb.append(" href='javascript:gotoPage("+pageBean.previousPage()+")'>上一页</a>  <a");
		sb.append(" href='javascript:gotoPage("+pageBean.nextPage()+")'>下一页</a>  <a");
		sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a>  <input type='text'");
		sb.append(" id='skipPage'");
		sb.append(" style='text-align: center; font-size: 12px;  50px;'>  <a");
		sb.append(" href='javascript:skipPage()'>Go</a>");
		sb.append("</div>");
		
		/*
		 * 给分页条添加与后台交互的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>z</short-name>
  <uri>/zking</uri>

 <tag>
    <name>page</name>
    <tag-class>com.psy.crud.tag.PageTag</tag-class>
    <body-content>JSP</body-content>
    <attribute>
        <name>pageBean</name>
        <required>true</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
  
</taglib>

　　web.xml:

<filter>
<filter-name>encodingFiter</filter-name>
<filter-class>com.psy.crud.util.EncodingFiter</filter-class>
</filter>
<filter-mapping>
<filter-name>encodingFiter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

　　dao层：

package com.psy.crud.dao;

import java.util.List;

import com.psy.crud.entity.Clazz;
import com.psy.crud.util.BaseDao;
import com.psy.crud.util.PageBean;
import com.psy.crud.util.StringUtils;

public class ClzDao extends BaseDao<Clazz> {

	/**
	 * 查询分页方法，查询单条数据公用的方法
	 * @param clz
	 * @param pageBean
	 * @return
	 */
	public List<Clazz> list(Clazz clz,PageBean pageBean){
		String sql="select * from t_struts_class where true";
		String cname=clz.getCname();
		int cid=clz.getCid();
		if(cid!=0) {
			sql +=" and cid="+cid;
		}
		if(StringUtils.isNotBlank(cname)) {
			sql +=" and cname like '%"+cname+"%'";
		}
		
		return super.executeQuery(sql, Clazz.class, pageBean);
		
	}
	
	
	/**
	 * 新增方法
	 * @param clz
	 * @return
	 */
	public int add(Clazz clz) {
		String sql="insert into t_struts_class values(?,?,?,?)";
		return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clz);
		
	}
	
	/**
	 * 修改
	 * @param clz
	 * @return
	 */
	public int edit(Clazz clz) {
		String sql="update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
		return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clz);
		
	}
	
	/**
	 * 删除
	 * @param clz
	 * @return
	 */
	public int del(Clazz clz) {
		String sql="delete from t_struts_class where cid=?";
		return super.executeUpdate(sql, new String[] {"cid"}, clz);
		
	}
	
	
	
	
	
}

　　web层：

package com.psy.crud.web;

import java.util.List;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.psy.crud.dao.ClzDao;
import com.psy.crud.entity.Clazz;
import com.psy.crud.util.PageBean;

public class ClazzAction extends BaseAction implements ModelDriven<Clazz> {

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

	public String list() {
		PageBean pageBean = new PageBean();
		pageBean.setRequest(request);
		List<Clazz> list = this.clzDao.list(clz, pageBean);
		// this.result=this.clzDao.list(clz, pageBean);
		request.setAttribute("clzList", list);
		request.setAttribute("pageBean", pageBean);

		return "list";

	}

	/**
	 * 跳转新增修改页面的公用方法
	 * 
	 * @return
	 */
	public String preSave() {

		if(clz.getCid() !=0) {
			Clazz c = this.clzDao.list(clz, null).get(0);
			request.setAttribute("clz", c);
		}
		return "preSave";

	}

	/**|
	 * 新增
	 * @return
	 */
	public String add() {

		result= this.clzDao.add(clz);
		return "toList";

	}

	/**
	 * 修改
	 * @return
	 */
	public String edit() {

		this.clzDao.edit(clz);
		return "toList";

	}

	/**
	 * 删除
	 * @return
	 */
	public String del() {

		this.clzDao.del(clz);
		return "toList";

	}

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

}

　　struts_sy.xml：

<action name="/clz_*" class="com.psy.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>

　　

jsp页面

clzList.jsp(信息显示页面)：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="z" uri="/zking" %>
<!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_list.action"
		method="post">
		班级名：<input type="text" name="cname"> 教员：<input type="text"
			name="bname"> <input type="submit">

	</form>
	<a href="${pageContext.request.contextPath }/sy/clz_preSave.action">新增</a>
	<table border="1" width="100%">

		<tr>
			<td>编号</td>
			<td>班级名</td>
			<td>教员</td>
			<td>图片</td>
			<td>操作</td>
		</tr>
		<c:forEach items="${clzList }" var="c">
			<tr>
				<td>${c.cid }</td>
				<td>${c.cname }</td>
				<td>${c.cteacher }</td>
				<td>${c.pic }</td>
				<td>
				    <a href="${pageContext.request.contextPath }/sy/clz_preSave.action?cid=${c.cid }">修改</a>  
				    <a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid }">删除</a>  
				    <a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid }">上传图片</a>  
				</td>
			</tr>
		</c:forEach>
	</table>

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

</body>
</html>

　　clzEdit.jsp（新增和修改页）：

<%@ 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="${pageContext.request.contextPath }${clz.cname == null ? '/sy/clz_add.action' : '/sy/clz_edit.action'}" method="post">
		编号:<input type="text" name="cid" value="${clz.cid }"> <br>
		班级名:<input type="text" name="cname" value="${clz.cname }"> <br>
		教员:<input type="text" name="cteacher" value="${clz.cteacher }"> <br>
		<input type="submit">
	</form>
</body>
</html>