struts2--CRUD

struts的CRUD

1、导入相关的pom依赖（struts、自定义标签库的依赖）

<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>

        <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

2.1  PageTag

 package com.yuan.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.yuan.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() {
         StringBuilder sb= new StringBuilder();

         //拼接下一次发送请求所要提交的隐藏的form表单
         sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
         sb.append("<input type='hidden' name='page'>");

         Map<String, String[]> paMap = pageBean.getPaMap();
         if(paMap != null && paMap.size()>0) {
             Set<Entry<String, String[]>> entrySet = paMap.entrySet();
             for (Entry<String, String[]> entry : entrySet) {
                 //上一次请求可能携带页码name=page的参数，但是改参数在前面已经单独赋值，
                 //因为上一次请求是第一页的数据，下一次可能是第二页，一位这前后请求page对应的值是不一样的，需要单独赋值

                 if(!"page".equals(entry.getKey())) {
                 for(String val:entry.getValue()) {
                     sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");

                 }
               }
             }
         }

         sb.append("</form>");

         //拼接分页条
         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&nbsp;&nbsp;<a  ");
         sb.append(" href='javascript:gotoPage(1)'>首页</a>&nbsp;&nbsp;<a");
         sb.append(" href='javascript:gotoPage("+pageBean.getPreviousPage()+")'>上一页</a>&nbsp;&nbsp;<a");
         sb.append(" href='javascript:gotoPage("+pageBean.getNexPage()+")'>下一页</a>&nbsp;&nbsp;<a");
         sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a>&nbsp;&nbsp;<input type='text'");
         sb.append(" id='skipPage'");
         sb.append(" style='text-align: center; font-size: 12px; width: 50px;'>&nbsp;&nbsp;<a");
         sb.append(" href='javascript:skipPage()'>Go</a>");
         sb.append("</div>");
         //拼接分页所需要的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();
     }

 }

2.2  mytag.tld

 <!DOCTYPE taglib
   PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
    "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
 <!-- 标签库描述符 -->
 <taglib xmlns="http://java.sun.com/JSP/TagLibraryDescriptor">
     <!-- 代表标签库的版本号 -->
     <tlib-version>1.0</tlib-version>
     <!-- 代表jsp的版本 -->
     <jsp-version>1.2</jsp-version>
     <!-- 你的标签库的简称 -->
     <short-name>test</short-name>
     <!-- 你标签库的引用uri -->
     <uri>/zking</uri>

     <!-- 1自定义分页标签 -->
     <tag>
       <name>Page</name>
       <tag-class>com.yuan.crud.tag.PageTag</tag-class>
       <body-content>JSP</body-content>
       <attribute>
          <name>pageBean</name>
          <required>true</required>
          <rtexprvalue>true</rtexprvalue>
       </attribute>
     </tag>

 </taglib>

2.3  web.xml配置

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

  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.action</url-pattern>
  </filter-mapping>
</web-app>

3、dao层去访问数据  Clazz实体类

3.1  ClazzDao

 package com.yuan.crud.dao;

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

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

 public class ClazzDao extends BaseDao<Clazz> {

     public List<Clazz> list(Clazz clazz,PageBean pageBean) throws InstantiationException, IllegalAccessException, 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);
     }

     public int add(Clazz clazz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
         String sql ="insert into t_struts_class values(?,?,?,?)";
         return executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz);
     }

     public int del(Clazz clazz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
         String sql ="delete from t_struts_class where cid=?";
         return executeUpdate(sql, new String[] {"cid"}, clazz);
     }

     public int edit(Clazz clazz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
         String sql ="update t_struts_class set cname = ?,cteacher=?,pic=? where cid=?";
         return executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clazz);
     }

 }

3.2  Clazz

 package com.yuan.crud.entity;

 public class Clazz{

     private int cid;
     private String cname;
     private String cteacher;
     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 getCteacher() {
         return cteacher;
     }
     public void setCteacher(String cteacher) {
         this.cteacher = cteacher;
     }
     public String getPic() {
         return pic;
     }
     public void setPic(String pic) {
         this.pic = pic;
     }
     @Override
     public String toString() {
         return "Clazz [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
     }

 }

4、web层去调用dao层给前台返回数据

4.1  BaseAction

 package com.yuan.crud.web;

 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;

 import org.apache.struts2.interceptor.ServletRequestAware;
 import org.apache.struts2.interceptor.ServletResponseAware;

 /**
  * 每一个开发的子控制器要用的属性都定义在通用的action中。
  * @author Administrator
  *
  */
 public class BaseAction implements ServletRequestAware, ServletResponseAware{
     /**
      * 为了传值使用
      */
     protected HttpServletResponse response;
     protected HttpServletRequest request;
     protected HttpSession session;
     protected ServletContext application;

     /**
      * 为了配置跳转页面所用
      */
     protected final static String SUCCESS = "success";
     protected final static String FAIL = "fail";
     protected final static String LIST = "list";
     protected final static String ADD = "add";
     protected final static String EDIT = "edit";
     protected final static String DETAIL = "detail";

     /**
      * 具体传值字段    后端向jsp页面传值所用字段
      */
     protected Object result;
     protected Object msg;
     protected int code;

     public Object getResult() {
         return result;
     }

     public Object getMsg() {
         return msg;
     }

     public int getCode() {
         return code;
     }

     @Override
     public void setServletResponse(HttpServletResponse arg0) {
         this.response = arg0;

     }

     @Override
     public void setServletRequest(HttpServletRequest arg0) {
         this.request = arg0;
         this.session = arg0.getSession();
         this.application = arg0.getServletContext();
     }

 }

4.2  ClazzAction

 package com.yuan.crud.web;

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

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

 public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

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

     /**
      * 查询
      * @return
      */
     public String list() {
         PageBean pageBean = new PageBean();
         pageBean.setRequest(request);
         try {
             List<Clazz> list = this.clzdao.list(clz, pageBean);
             System.out.println(list);
             request.setAttribute("clzList", list);
             request.setAttribute("pageBean", pageBean);
         } catch (InstantiationException | IllegalAccessException | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "list";
     }

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

     public String add() {
         try {
             this.code = this.clzdao.add(clz);
         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     public String edit() {
         try {
             this.clzdao.edit(clz);
         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     public String del() {
         try {
             this.clzdao.del(clz);
         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
                 | SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return "toList";
     }

     @Override
     public Clazz getModel() {

         return clz;
     }

 }

5、在struts_sy.xml进行配置

 <?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.yuan.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>
     </package>
 </struts>

6、写jsp

6.1  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="/****"%>
 <!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>&nbsp;&nbsp;&nbsp;
        <a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid}">删除</a>&nbsp;&nbsp;&nbsp;
        <a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">图片上传</a>&nbsp;&nbsp;&nbsp;
        </td>
    </tr>
    </c:forEach>
 </table>
  <z:Page pageBean="${pageBean }"></z:Page>
 </body>
 </html>

6.2  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="${pageContext.request.contextPath }${result.cname == null ? '/sy/clz_add.action' : '/sy/clz_edit.action'}" method="post">
 cid:<input type="text" name="cid" value="${result.cid }"/>
 cname:<input type="text" name="cname" value="${result.cname }"/>
 cteacher:<input type="text" name="cteacher" value="${result.cteacher }"/>

<input type="submit"/>
</form>
</body>
</html>

7.页面显示

7.1首页

7.2 新增

7.3 修改

   显示