Struts CRUD

Struts CRUD

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

1、导入相关的pom依赖（struts、自定义标签库的依赖）

 <!-- 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>

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

编写实体类clazz,java

 package com.crud.entity;

 public class clazz {

     private int cid;
     private String cname;
     private String cteather;
     private String pic;
     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 getCteather() {
         return cteather;
     }
     public void setCteather(String cteather) {
         this.cteather = cteather;
     }
     public String getPic() {
         return pic;
     }
     public void setPic(String pic) {
         this.pic = pic;
     }
     @Override
     public String toString() {
         return "clazz [cid=" + cid + ", cname=" + cname + ", cteather=" + cteather + ", pic=" + pic + "]";
     }

 }

dao层Clazzdao增删改查继承BaseDao

 package com.crud.dao;

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

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

 public class Clazzdao extends BaseDao<Clazz> {

     //查询
     public List<Clazz> list(Clazz clazz, PageBean pagebean) throws Exception, Exception, 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
         public int add(Clazz clazz) throws NoSuchFieldException, Exception {
             String sql = "insert into t_struts_class values(?,?,?,?)";
             return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz);

         }

         //删除
                 public int del(Clazz clazz) throws NoSuchFieldException, Exception {
                     String sql = "delete from t_struts_class where cid = ?";
                     return super.executeUpdate(sql, new String[] {"cid"}, clazz);

                 }

                 //改
                 public int edit(Clazz clazz) throws NoSuchFieldException, Exception {
                     String sql = "update t_struts_class set cname = ?,cteacher = ?,pic = ? where cid = ?";
                     return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz);

                 }

 }

4、web层去调用dao层给前台返回数据

ClazzAction 

 package com.crud.web;

 import java.util.List;

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

 public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

     private Clazz clz = new Clazz();
     private Clazzdao clzdao = new Clazzdao();

     public String list() {
         PageBean pageBean = new PageBean();
         pageBean.setRequest(request);
         try {
         List<Clazz>    list = this.clzdao.list(clz, pageBean);
         request.setAttribute("clzList", list);
         request.setAttribute("pageBean", pageBean);
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "list";
     }

     /**
      * 跳转编辑页面
      * @return
      */
     public String preSave() {
         if(clz.getCid() != 0) {
             try {
             this.result = this.clzdao.list(clz, null).get(0);
             } catch (Exception e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }
         }

         return "preSave";
     }

     public String add() {
         try {
         this.code =    this.clzdao.add(clz);
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

         return "toList";
     }

     public String edit() {
         try {
             this.clzdao.edit(clz);
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     public String del() {
         try {
             this.clzdao.del(clz);
         } catch (Exception 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

chain：Action链式处理的结果类型，也就是将结果转发到这个action中。
  redirect：实际上dispatcher和redirect的区别就是在于转发和重定向的区别。
   redirectAction：用于直接redirectaction。

 <?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.crud.web.ClazzAction" method="{1}">
     <result name="list">/clazzList.jsp</result>
     <result name="preSave">/clzEdit.jsp</result>
     <result name="toList" type="redirectAction">/clz_list</result>

     </action>
     </package>
 </struts> 

6、写jsp

 <%@ 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="${pageContext.request.contextPath}/sy/clazz_list.action"
         method="post">
         班级名称：<input type="text" name="cname"> <input type="submit"
             value="确定">
             <input type="hidden" name="rows" value="15">
     </form>
     <a href="${pageContext.request.contextPath}/sy/clazz_preSave.action">增加</a>
     <table border="1" width="100%">
         <tr>
             <td>编号</td>
             <td>名称</td>
             <td>教员</td>
             <td>班级图片</td>
             <td>操作</td>
         </tr>
         <c:forEach items="${clazzList }" var="c">
             <tr>
                 <td>${c.cid }</td>
                 <td>${c.cname }</td>
                 <td>${c.cteacher }</td>
                 <td>${c.pic }</td>
                 <td>
                     <a href="${pageContext.request.contextPath}/sy/clazz_preSave.action?cid=${c.cid}">修改</a>&nbsp;
                     <a href="${pageContext.request.contextPath}/sy/clazz_del.action?cid=${c.cid}">删除</a>
                     <a href="${pageContext.request.contextPath}/sy/clazz_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>班级编辑界面</title>
 </head>
 <body>
 <form action="${pageContext.request.contextPath}${result.cname == null ? '/sy/clazz_add.action' : '/sy/clazz_edit.action' }" method="post">

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

修改

删除

新增