• 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

      1 package com.yuan.crud.tag;
  2 
  3 import java.io.IOException;
  4 import java.util.Map;
  5 import java.util.Map.Entry;
  6 import java.util.Set;
  7 
  8 import javax.servlet.jsp.JspException;
  9 import javax.servlet.jsp.JspWriter;
 10 import javax.servlet.jsp.tagext.BodyTagSupport;
 11 
 12 import com.yuan.crud.util.PageBean;
 13 
 14 public class PageTag extends BodyTagSupport {
 15 
 16     /**
 17      * 
 18      */
 19     private static final long serialVersionUID = 1L;
 20 
 21     private PageBean pageBean;
 22 
 23     public PageBean getPageBean() {
 24         return pageBean;
 25     }
 26 
 27     public void setPageBean(PageBean pageBean) {
 28         this.pageBean = pageBean;
 29     }
 30     
 31     @Override
 32     public int doStartTag() throws JspException {
 33         JspWriter out = pageContext.getOut();
 34         try {
 35             out.print(toHTML());
 36         } catch (IOException e) {
 37             // TODO Auto-generated catch block
 38             e.printStackTrace();
 39         }
 40         return super.doStartTag();
 41     }
 42 
 43     private String toHTML() {
 44         StringBuilder sb= new StringBuilder();
 45         
 46         //拼接下一次发送请求所要提交的隐藏的form表单
 47         sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
 48         sb.append("<input type='hidden' name='page'>");
 49         
 50         Map<String, String[]> paMap = pageBean.getPaMap();
 51         if(paMap != null && paMap.size()>0) {
 52             Set<Entry<String, String[]>> entrySet = paMap.entrySet();
 53             for (Entry<String, String[]> entry : entrySet) {
 54                 //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，
 55                 //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
 56                 
 57                 if(!"page".equals(entry.getKey())) {
 58                 for(String val:entry.getValue()) {
 59                     sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");
 60                     
 61                 }
 62               }
 63             }
 64         }
 65         
 66         sb.append("</form>");
 67         
 68         
 69         //拼接分页条
 70         sb.append("<div style='text-align: right; font-size: 12px;'>");
 71         sb.append("每页"+pageBean.getRows()+"条，共"+pageBean.getTotal()+"条，第"+pageBean.getPage()+"页，共"+pageBean.getMaxPage()+"页&nbsp;&nbsp;<a  ");
 72         sb.append(" href='javascript:gotoPage(1)'>首页</a>&nbsp;&nbsp;<a");
 73         sb.append(" href='javascript:gotoPage("+pageBean.getPreviousPage()+")'>上一页</a>&nbsp;&nbsp;<a");
 74         sb.append(" href='javascript:gotoPage("+pageBean.getNexPage()+")'>下一页</a>&nbsp;&nbsp;<a");
 75         sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a>&nbsp;&nbsp;<input type='text'");
 76         sb.append(" id='skipPage'");
 77         sb.append(" style='text-align: center; font-size: 12px;  50px;'>&nbsp;&nbsp;<a");
 78         sb.append(" href='javascript:skipPage()'>Go</a>");
 79         sb.append("</div>");
 80         //拼接分页所需要的js代码
 81         sb.append("<script type='text/javascript'>");
 82         sb.append(" function gotoPage(page) {");
 83         sb.append(" document.getElementById('pageBeanForm').page.value = page;");
 84         sb.append(" document.getElementById('pageBeanForm').submit();");
 85         sb.append(" }");
 86         sb.append(" function skipPage() {");
 87         sb.append(" var page = document.getElementById('skipPage').value;");
 88         sb.append(" if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
 89         sb.append(" alert('请输入1~N的数字');");
 90         sb.append(" return;");
 91         sb.append(" }");
 92         sb.append(" gotoPage(page);");
 93         sb.append(" }");
 94         sb.append(" </script>");
 95         
 96         return sb.toString();
 97     }
 98     
 99     
100 }

      2.2  mytag.tld

     1 <!DOCTYPE taglib
 2   PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
 3    "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
 4 <!-- 标签库描述符 -->
 5 <taglib xmlns="http://java.sun.com/JSP/TagLibraryDescriptor">
 6     <!-- 代表标签库的版本号 -->
 7     <tlib-version>1.0</tlib-version>
 8     <!-- 代表jsp的版本 -->
 9     <jsp-version>1.2</jsp-version>
10     <!-- 你的标签库的简称 -->
11     <short-name>test</short-name>
12     <!-- 你标签库的引用uri -->
13     <uri>/zking</uri>
14 
15     <!-- 1自定义分页标签 -->
16     <tag>
17       <name>Page</name>
18       <tag-class>com.yuan.crud.tag.PageTag</tag-class>
19       <body-content>JSP</body-content>
20       <attribute>
21          <name>pageBean</name>
22          <required>true</required>
23          <rtexprvalue>true</rtexprvalue>
24       </attribute>
25     </tag>
26     
27            
28         
29     
30 </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

     1 package com.yuan.crud.dao;
 2 
 3 import java.sql.SQLException;
 4 import java.util.List;
 5 
 6 import com.yuan.crud.entity.Clazz;
 7 import com.yuan.crud.util.BaseDao;
 8 import com.yuan.crud.util.PageBean;
 9 import com.yuan.crud.util.StringUtils;
10 
11 public class ClazzDao extends BaseDao<Clazz> {
12 
13     public List<Clazz> list(Clazz clazz,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
14         String sql="select * from t_struts_class where true ";
15         String cname= clazz.getCname();
16         int cid=clazz.getCid();
17         if(cid!=0) {
18             sql += " and cid="+cid;
19         }
20         if(StringUtils.isNotBlank(cname)) {
21             sql += " and cname like '%"+cname+"%'";
22         }
23         return super.executeQuery(sql , Clazz.class, pageBean);
24     }
25     
26     
27     public int add(Clazz clazz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
28         String sql ="insert into t_struts_class values(?,?,?,?)";
29         return executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz);
30     }
31     
32     public int del(Clazz clazz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
33         String sql ="delete from t_struts_class where cid=?";
34         return executeUpdate(sql, new String[] {"cid"}, clazz);
35     }
36     
37     public int edit(Clazz clazz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
38         String sql ="update t_struts_class set cname = ?,cteacher=?,pic=? where cid=?";
39         return executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clazz);
40     }
41     
42     
43     
44     
45 }

      3.2  Clazz

     1 package com.yuan.crud.entity;
 2 
 3 public class Clazz{
 4 
 5     
 6     private int cid;
 7     private String cname;
 8     private String cteacher;
 9     private String pic;
10     public int getCid() {
11         return cid;
12     }
13     public void setCid(int cid) {
14         this.cid = cid;
15     }
16     public String getCname() {
17         return cname;
18     }
19     public void setCname(String cname) {
20         this.cname = cname;
21     }
22     public String getCteacher() {
23         return cteacher;
24     }
25     public void setCteacher(String cteacher) {
26         this.cteacher = cteacher;
27     }
28     public String getPic() {
29         return pic;
30     }
31     public void setPic(String pic) {
32         this.pic = pic;
33     }
34     @Override
35     public String toString() {
36         return "Clazz [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
37     }
38     
39     
40     
41     
42 }

    4、web层去调用dao层给前台返回数据  

     4.1  BaseAction

     1 package com.yuan.crud.web;
 2 
 3 import javax.servlet.ServletContext;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import javax.servlet.http.HttpSession;
 7 
 8 import org.apache.struts2.interceptor.ServletRequestAware;
 9 import org.apache.struts2.interceptor.ServletResponseAware;
10 
11 /**
12  * 每一个开发的子控制器要用的属性都定义在通用的action中。
13  * @author Administrator
14  *
15  */
16 public class BaseAction implements ServletRequestAware, ServletResponseAware{
17     /**
18      * 为了传值使用
19      */
20     protected HttpServletResponse response;
21     protected HttpServletRequest request;
22     protected HttpSession session;
23     protected ServletContext application;
24     
25     /**
26      * 为了配置跳转页面所用
27      */
28     protected final static String SUCCESS = "success";
29     protected final static String FAIL = "fail";
30     protected final static String LIST = "list";
31     protected final static String ADD = "add";
32     protected final static String EDIT = "edit";
33     protected final static String DETAIL = "detail";
34     
35     /**
36      * 具体传值字段    后端向jsp页面传值所用字段
37      */
38     protected Object result;
39     protected Object msg;
40     protected int code;
41 
42     public Object getResult() {
43         return result;
44     }
45 
46     public Object getMsg() {
47         return msg;
48     }
49 
50     public int getCode() {
51         return code;
52     }
53 
54     @Override
55     public void setServletResponse(HttpServletResponse arg0) {
56         this.response = arg0;
57         
58     }
59 
60     @Override
61     public void setServletRequest(HttpServletRequest arg0) {
62         this.request = arg0;
63         this.session = arg0.getSession();
64         this.application = arg0.getServletContext();
65     }
66     
67 
68 }

     4.2  ClazzAction

     1 package com.yuan.crud.web;
 2 
 3 import java.sql.SQLException;
 4 import java.util.List;
 5 
 6 import com.opensymphony.xwork2.ModelDriven;
 7 import com.yuan.crud.dao.ClazzDao;
 8 import com.yuan.crud.entity.Clazz;
 9 import com.yuan.crud.util.PageBean;
10 
11 public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{
12 
13     private Clazz clz = new Clazz();
14     private ClazzDao clzdao = new ClazzDao();
15     
16     /**
17      * 查询
18      * @return
19      */
20     public String list() {
21         PageBean pageBean = new PageBean();
22         pageBean.setRequest(request);
23         try {
24             List<Clazz> list = this.clzdao.list(clz, pageBean);
25             System.out.println(list);
26             request.setAttribute("clzList", list);
27             request.setAttribute("pageBean", pageBean);
28         } catch (InstantiationException | IllegalAccessException | SQLException e) {
29             // TODO Auto-generated catch block
30             e.printStackTrace();
31         }
32         return "list";
33     }
34     
35     /**
36      * 跳转编辑页面（新增修改页面）
37      * @return
38      */
39     public String preSave() {
40         if(clz.getCid()!=0) {
41             try {
42                 this.result = this.clzdao.list(clz, null).get(0);
43             } catch (InstantiationException | IllegalAccessException | SQLException e) {
44                 // TODO Auto-generated catch block
45                 e.printStackTrace();
46             }
47         }
48         return "preSave";
49     }
50     
51     public String add() {
52         try {
53             this.code = this.clzdao.add(clz);
54         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
55                 | SQLException e) {
56             // TODO Auto-generated catch block
57             e.printStackTrace();
58         }
59         return "toList";
60     }
61     
62     public String edit() {
63         try {
64             this.clzdao.edit(clz);
65         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
66                 | SQLException e) {
67             // TODO Auto-generated catch block
68             e.printStackTrace();
69         }
70         return "toList";
71     }
72     
73     public String del() {
74         try {
75             this.clzdao.del(clz);
76         } catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
77                 | SQLException e) {
78             // TODO Auto-generated catch block
79             e.printStackTrace();
80         }
81         return "toList";
82     }
83     
84     
85     @Override
86     public Clazz getModel() {
87         
88         return clz;
89     }
90     
91 }

    5、在struts_sy.xml进行配置

     1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
 4     "http://struts.apache.org/dtds/struts-2.5.dtd">
 5 <struts>
 6     <package name="sy" extends="base" namespace="/sy">
 7       
     8         
     9      
    10       
11       
12       <action name="/clz_*" class="com.yuan.crud.web.ClazzAction" method="{1}">
13         <result name="list">/clzList.jsp</result>
14         <result name="preSave">/clzEdit.jsp</result>
15         <result name="toList" type="redirectAction">clz_list</result>
16       </action>
17     </package>
18 </struts>

      6、写jsp

      6.1  clzList.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3     <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
 4  <%@taglib prefix="z" uri="/****"%>
 5 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 6 <html>
 7 <head>
 8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 9 <title>Insert title here</title>
10 </head>
11 <body>
12 <form action="${pageContext.request.contextPath }/sy/clz_list.action" method="post">
13 
14  班级名： <input type="text" name="cname" /><input type="submit" value="确定"/>
15  
16 </form>
17 <a href="${pageContext.request.contextPath }/sy/clz_preSave.action">新增</a>
18 <table border="1" width="100%">
19    <tr>
20        <td>编号</td>
21        <td>班级名</td>
22        <td>教员</td>
23        <td>图片</td>
24        <td>操作</td>
25    </tr>
26    
27    <c:forEach items="${clzList }" var="c">
28      <tr>
29        <td>${c.cid }</td>
30        <td>${c.cname }</td>
31        <td>${c.cteacher }</td>
32        <td>${c.pic }</td>
33        
34           
    35        
    36        <td>
37        <a href="${pageContext.request.contextPath }/sy/clz_preSave.action?cid=${c.cid}">修改</a>&nbsp;&nbsp;&nbsp;
38        <a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid}">删除</a>&nbsp;&nbsp;&nbsp;
39        <a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">图片上传</a>&nbsp;&nbsp;&nbsp;
40        </td>
41    </tr>
42    </c:forEach>
43 </table>
44  <z:Page pageBean="${pageBean }"></z:Page>
45 </body>
46 </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

     
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  • 原文地址：https://www.cnblogs.com/ly-0919/p/11261735.html
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