struts 的 crud

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、mytag.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

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>

　

pageTag(通用分页)

package com.chenjiahao.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.chenjiahao.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();
	}
}

　　

　自定义标签库

mytag.tld

<taglib xmls="http://java.sun.com/JSP/TagLibraryDescriptor">
	<!-- 定义标签库的版本 -->
	<tlib-version>1.0</tlib-version>
	<!-- 规范的版本 -->
	<jsp-version>1.2</jsp-version>
	<short-name>Simple Tags</short-name>
	<!-- 自定义标签库名称 -->
	<uri>/Zking</uri>




	<!-- 自定义h标签 -->
	<!-- 标签 -->
	<tag>
		<!-- 标签名字 -->
		<name>page</name>
		<!-- 标签的助手类 -->
		<tag-class>com.chenjiahao.crud.tag.PageTag</tag-class>
		<!-- 标签的内容类型;empty表示空标签(使用空标签会报错)，jsp表示可以为任何合法的jsp元素 -->
		<body-content>JSP</body-content>
		<!-- 标签属性 -->
		<attribute>
			<!-- 标签属性名 -->
			<name>pageBean</name>
			<!-- 是否必需的 -->
			<required>true</required>
			<!-- 是否支持动态数据 -->
			<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.chenjiahao.crud.util.EncodingFiter</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>encodingFiter</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  
  <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>

　　dao层

package com.chenjiahao.crud.dao;

import java.util.List;

import com.chenjiahao.crud.entity.Clazz;

import com.chenjiahao.crud.util.EntityBaseDao;
import com.chenjiahao.crud.util.PageBean;
import com.chenjiahao.crud.util.StringUtils;


public class ClazzDao extends EntityBaseDao<Clazz>{

	/**
	 * 查询分页方法，查询单条数据公共的方法
	 * @param clz
	 * @param pageBean
	 * @return
	 * @throws Exception
	 */
	  public List<Clazz> list(Clazz clz,PageBean pageBean)throws Exception{
		  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, pageBean, Clazz.class);
	  }
	  /**
	   * 新增方法
	   * @param clz
	   * @return
	   * @throws Exception
	   */
	  
	  public int add(Clazz clz) throws Exception{
		  String sql="insert into t_struts_class values(?,?,?,?)";
		  return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clz);
	  }
	  /**
	   * 修改方法
	   * @param clz
	   * @return
	   * @throws Exception
	   */
	  public int edit(Clazz clz) throws Exception{
		  String sql="update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
		  return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clz);
	  }
	  /**
	   * 删除方法
	   * @param clz
	   * @return
	   * @throws Exception
	   */
	  public int del(Clazz clz) throws Exception{
		  String sql="delete from t_struts_class where cid=?";
		  return super.executeUpdate(sql, new String[] {"cid"}, clz);
	  }
	  
	  
}

web层调用dao返回数据给jsp

package com.chenjiahao.crud.web;

import java.util.List;

import com.chenjiahao.crud.dao.ClazzDao;
import com.chenjiahao.crud.entity.Clazz;
import com.chenjiahao.crud.util.BaseAction;
import com.chenjiahao.crud.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;

public class ClazzAction extends BaseAction implements ModelDriven<Clazz> {
	private ClazzDao clzDao = new ClazzDao();
	private Clazz clz = new Clazz();
    
	
	public String list() throws Exception {
		PageBean pageBean=new PageBean();
		pageBean.setRequest(request);
		List<Clazz> list=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共方法
	 * @return
	 */
	public String preSave()throws Exception{
		if(clz.getCid()!=0) {
		 Clazz c=	this.clzDao.list(clz, null).get(0);
		 request.setAttribute("clz", c);
		}
		return "preSave";
	}
	/**
	 * 新增
	 * @return
	 * @throws Exception
	 */
	public String add()throws Exception {
		result=this.clzDao.add(clz);
		return "toList";
	}
	/**
	 * 修改
	 * @return
	 * @throws Exception
	 */
	public String edit()throws Exception {
		
		this.clzDao.edit(clz);
		return "toList";
	}
	
	/**
	 * 删除
	 * @return
	 * @throws Exception
	 */
	public String del() throws Exception{
		this.clzDao.del(clz);
		
		return "toList";
	}
	
	@Override
	public Clazz getModel() {
		// TODO Auto-generated method stub
		return clz;
	}

}

　　struts_sy.xml配置

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

　　jspy页面

clzList.jsp

<%@ 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" /><input type="submit" value="确定"/>
 
</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=${c.cid}">图片上传</a>   
       </td>
   </tr>
   </c:forEach>
</table>
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>

　　clzEdit.jsp

<%@ 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">
 cid:<input type="text" name="cid" value="${clz.cid }"/>
 cname:<input type="text" name="cname" value="${clz.cname }"/> 
 cteacher:<input type="text" name="cteacher" value="${clz.cteacher }"/>
<input type="submit"/>
</form>
</body>
</html>