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; width: 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>