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  • 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>
    

      

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  • 原文地址:https://www.cnblogs.com/chenjiahao9527/p/11108602.html
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