Struts2的CRUD

利用struts2完成增删改查

1、导入相关的pom依赖（struts、自定义标签库的依赖）

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 3   <modelVersion>4.0.0</modelVersion>
 4   <groupId>com.lww</groupId>
 5   <artifactId>T224_struts</artifactId>
 6   <packaging>war</packaging>
 7   <version>0.0.1-SNAPSHOT</version>
 8   <name>T224_struts Maven Webapp</name>
 9   <url>http://maven.apache.org</url>
10   <dependencies>
11      <dependency>
12       <groupId>junit</groupId>
13       <artifactId>junit</artifactId>
14       <version>4.12</version>
15       <scope>test</scope>
16     </dependency>
17     
18     <dependency>
19             <groupId>javax.servlet</groupId>
20             <artifactId>javax.servlet-api</artifactId>
21             <version>4.0.1</version>
22             <scope>provided</scope>
23     </dependency>
24     
25      <dependency>
26             <groupId>org.apache.struts</groupId>
27             <artifactId>struts2-core</artifactId>
28             <version>2.5.13</version>
29      </dependency>
30      
31      <!-- 5.3、jstl、standard -->
32         <dependency>
33             <groupId>jstl</groupId>
34             <artifactId>jstl</artifactId>
35             <version>1.2</version>
36         </dependency>
37         <dependency>
38             <groupId>taglibs</groupId>
39             <artifactId>standard</artifactId>
40             <version>1.1.2</version>
41         </dependency>
42 
43         <!-- 5.4、tomcat-jsp-api -->
44         <dependency>
45             <groupId>org.apache.tomcat</groupId>
46             <artifactId>tomcat-jsp-api</artifactId>
47             <version>8.0.47</version>
48         </dependency>
49         
50         <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
51     <dependency>
52         <groupId>mysql</groupId>
53         <artifactId>mysql-connector-java</artifactId>
54             <version>5.1.40</version>
55     </dependency>
56 
57   </dependencies>
58   <build>
59     <finalName>T224_struts</finalName>
60     <plugins>
61             <plugin>
62                 <groupId>org.apache.maven.plugins</groupId>
63                 <artifactId>maven-compiler-plugin</artifactId>
64                 <version>3.7.0</version>
65                 <configuration>
66                     <source>1.8</source>
67                     <target>1.8</target>
68                     <encoding>UTF-8</encoding>
69                 </configuration>
70             </plugin>
71     </plugins>
72   </build>
73 </project>

2、分页的tag类导入、z.tld、完成web.xml的配置

PageTag 通用分页

 1 package com.liuwenwu.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.liuwenwu.crud.util.PageBean;
13 
14 public class PageTag extends BodyTagSupport {
15 
16     private static final long serialVersionUID = 1L;
17     private PageBean pageBean;
18     public PageBean getPageBean() {
19         return pageBean;
20     }
21     public void setPageBean(PageBean pageBean) {
22         this.pageBean = pageBean;
23     }
24     @Override
25     public int doStartTag() throws JspException {
26         JspWriter out = pageContext.getOut();
27         try {
28             out.print(toHTML());
29         } catch (IOException e) {
30             // TODO Auto-generated catch block
31             e.printStackTrace();
32         }
33         return super.doStartTag();
34     }
35     private String toHTML() {
36         StringBuffer sb = new StringBuffer();
37         /*
38          * 拼接向后台提交数据的form表单
39          *     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
40          */
41         sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
42         sb.append("<input type='hidden' name='page'>");
43         Map<String, String[]> parameterMap = pageBean.getParameterMap();
44         if(parameterMap != null && parameterMap.size() > 0) {
45             Set<Entry<String, String[]>> entrySet = parameterMap.entrySet();
46             for (Entry<String, String[]> entry : entrySet) {
47                 if(!"page".equals(entry.getKey())) {
48                     String[] values = entry.getValue();
49                     for (String val : values) {
50                         sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");
51                     }
52                 }
53             }
54         }
55         sb.append("</form>");
56         
57         /*
58          * 展示的分页条
59          */
60         sb.append("<div style='text-align: right; font-size: 12px;'>");
61         sb.append("每页"+pageBean.getRows()+"条，共"+pageBean.getTotal()+"条，第"+pageBean.getPage()+"页，共"+pageBean.getMaxPage()+"页&nbsp;&nbsp;<a href='javascript:gotoPage(1)'>首页</a>&nbsp;&nbsp;<a");
62         sb.append(" href='javascript:gotoPage("+pageBean.previousPage()+")'>上一页</a>&nbsp;&nbsp;<a");
63         sb.append(" href='javascript:gotoPage("+pageBean.nextPage()+")'>下一页</a>&nbsp;&nbsp;<a");
64         sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a>&nbsp;&nbsp;<input type='text'");
65         sb.append(" id='skipPage'");
66         sb.append(" style='text-align: center; font-size: 12px; width: 50px;'>&nbsp;&nbsp;<a");
67         sb.append(" href='javascript:skipPage()'>Go</a>");
68         sb.append("</div>");
69         
70         /*
71          * 给分页条添加与后台交互的js代码
72          */
73         sb.append("<script type='text/javascript'>");
74         sb.append("        function gotoPage(page) {");
75         sb.append("            document.getElementById('pageBeanForm').page.value = page;");
76         sb.append("            document.getElementById('pageBeanForm').submit();");
77         sb.append("        }");
78         sb.append("        function skipPage() {");
79         sb.append("            var page = document.getElementById('skipPage').value;");
80         sb.append("            if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");
81         sb.append("                alert('请输入1~N的数字');");
82         sb.append("                return;");
83         sb.append("            }");
84         sb.append("            gotoPage(page);");
85         sb.append("        }");
86         sb.append("</script>");
87         return sb.toString();
88     }
89 }

z.tld自定义标签配置文件

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 
 3 <taglib xmlns="http://java.sun.com/xml/ns/j2ee"
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
 6     version="2.0">
 7     
 8   <description>zking 1.1 core library</description>
 9   <display-name>zking core</display-name>
10   <tlib-version>1.1</tlib-version>
11   <short-name>z</short-name>
12   <uri>/zking</uri>
13 
14  <tag>
15      <!-- 标签库中的标签名 -->
16     <name>page</name>
17     <!-- 标签对应的助手类的全路径名 -->
18     <tag-class>com.liuwenwu.crud.tag.PageTag</tag-class>
19     <body-content>JSP</body-content>
20     <attribute>
21             <!-- 属性名 -->
22         <name>pageBean</name>
23         <!-- 属性值是否是必填 -->
24         <required>true</required>
25         <!-- 是否支持表达式 -->
26         <rtexprvalue>true</rtexprvalue>
27     </attribute>
28   </tag>
29 </taglib>

wed.xml配置

 1 <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
 2          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
 4          version="3.1">
 5   <display-name>Archetype Created Web Application</display-name>
 6     <filter>
 7       <filter-name>encodingFiter</filter-name>
 8       <filter-class>com.liuwenwu.crud.util.EncodingFiter</filter-class>
 9   </filter>
10   <filter-mapping>
11       <filter-name>encodingFiter</filter-name>
12       <url-pattern>/*</url-pattern>
13   </filter-mapping>
14   
15       <filter>
16           <filter-name>struts</filter-name>
17           <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
18       </filter>
19       <filter-mapping>
20           <filter-name>struts</filter-name>
21           <url-pattern>*.action</url-pattern>
22       </filter-mapping>
23 </web-app>

3、编写dao层去访问数据

 1 package com.liuwenwu.crud.dao;
 2 import java.sql.SQLException;
 3 import java.util.List;
 4 
 5 import org.apache.commons.lang3.StringUtils;
 6 
 7 import com.liuwenwu.crud.entity.Clazz;
 8 import com.liuwenwu.crud.util.EntityBaseDao;
 9 import com.liuwenwu.crud.util.PageBean;
10 
11 
12 public class ClazzDao extends EntityBaseDao<Clazz>{
13 
14     /**
15      * 查询分页，查询单条数据公用方法
16      * @param clz
17      * @param pageBean
18      * @return
19      * @throws InstantiationException
20      * @throws IllegalAccessException
21      * @throws SQLException
22      */
23     public List<Clazz> list(Clazz clz,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
24         String sql="select * from t_struts_class where true ";
25         String cname=clz.getCname();
26         int cid=clz.getCid();
27         if(cid!=0) {
28             sql+=" and cid="+cid;
29         }
30         if(StringUtils.isNoneBlank(cname)) {
31             sql+=" and cname like '%"+cname+"%'";
32         }
33         return super.executeQuery(sql, pageBean, Clazz.class);
34         
35     }
36     
37     /**
38      * 新增方法
39      * @param clz
40      * @return
41      * @throws NoSuchFieldException
42      * @throws SecurityException
43      * @throws IllegalArgumentException
44      * @throws IllegalAccessException
45      * @throws SQLException
46      */
47     public int add(Clazz clz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
48         String sql="insert into t_struts_class values(?,?,?,?)";
49         return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clz);
50         
51     }
52     
53     /**
54      * 修改方法
55      * @param clz
56      * @return
57      * @throws NoSuchFieldException
58      * @throws SecurityException
59      * @throws IllegalArgumentException
60      * @throws IllegalAccessException
61      * @throws SQLException
62      */
63     public int edit(Clazz clz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
64         String sql="update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
65         return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clz);
66         
67     }
68     /**
69      * 删除方法
70      * @param clz
71      * @return
72      * @throws NoSuchFieldException
73      * @throws SecurityException
74      * @throws IllegalArgumentException
75      * @throws IllegalAccessException
76      * @throws SQLException
77      */
78     public int del(Clazz clz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
79         String sql="delete from t_struts_class where cid=?";
80         return super.executeUpdate(sql, new String[] {"cid"}, clz);
81         
82     }
83 }

4、web层去调用dao层给前台返回数据

 1 package com.liuwenwu.crud.web;
 2 
 3 import java.sql.SQLException;
 4 import java.util.List;
 5 
 6 import com.liuwenwu.crud.dao.ClazzDao;
 7 import com.liuwenwu.crud.entity.Clazz;
 8 import com.liuwenwu.crud.util.PageBean;
 9 import com.opensymphony.xwork2.ModelDriven;
10 
11 public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{
12     
13     private ClazzDao clzDao=new ClazzDao();
14     private Clazz clz=new Clazz();
15     
16     public String list() {
17         PageBean pageBean=new PageBean();
18         pageBean.setRequest(request);
19         try {
20             List<Clazz> list= this.clzDao.list(clz, pageBean);
21 //            this.result=this.clzDao.list(clz, pageBean);
22             request.setAttribute("clzList", list);
23             request.setAttribute("pageBean", pageBean);
24         } catch (Exception e) {
25             e.printStackTrace();
26         } 
27         return "list";
28     }
29 
30     /**
31      * 跳转新增修改页面的公用方法
32      * @return
33      */
34     public String preSave() {
35         if(clz.getCid()!=0) {
36             try {
37                 Clazz c = this.clzDao.list(clz, null).get(0);
38                 request.setAttribute("clz", c);
39             } catch (Exception e) {
40                 e.printStackTrace();
41             }
42         }
43         return "preSave";
44     }
45     /**
46      * 新增
47      * @return
48      */
49     public String add() {
50         try {
51             result=this.clzDao.add(clz);
52         } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
53                 | SQLException e) {
54             // TODO Auto-generated catch block
55             e.printStackTrace();
56         }
57         return "toList";
58     }
59     /**
60      * 修改
61      * @return
62      */
63     public String edit() {
64         try {
65             this.clzDao.edit(clz);
66         } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
67                 | SQLException e) {
68             // TODO Auto-generated catch block
69             e.printStackTrace();
70         }
71         return "toList";
72     }
73     /**
74      * 删除
75      * @return
76      */
77     public String del() {
78         try {
79             this.clzDao.del(clz);
80         } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
81                 | SQLException e) {
82             // TODO Auto-generated catch block
83             e.printStackTrace();
84         }
85         return "toList";
86     }
87     
88     
89     @Override
90     public Clazz getModel() {
91         // TODO Auto-generated method stub
92         return clz;
93     }
94     
95 }

5、在struts_sy.xml进行配置

1 <action name="/clz_*" class="com.liuwenwu.crud.web.ClazzAction" method="{1}">
2             <result name="list">/clzList.jsp</result>
3             <result name="preSave">/clzEdit.jsp</result>
4             <result name="toList" type="redirectAction">/clz_list</result>
5         </action>

6、前端jsp展示页面

 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="/zking" %>
 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 <h2>班级</h2><br>
13     <form action="${pageContext.request.contextPath }/sy/clz_list.action" method="post">
14         班级名：<input type="text" name="cname">
15               <input type="submit" value="确定">
16     </form>
17     <a href="${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         <c:forEach items="${clzList }" var="c">
27         <tr>
28             <td>${c.cid }</td>
29             <td>${c.cname }</td>
30             <td>${c.cteacher}</td>
31             <td>${c.pic }</td>
32             <td>
33                 <a href="${pageContext.request.contextPath }/sy/clz_preSave.action?cid=${c.cid}">修改</a>&nbsp;&nbsp;
34                 <a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid}">删除</a>&nbsp;&nbsp;
35                 <a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">图片上传</a>&nbsp;&nbsp;
36             </td>
37         </tr>    
38         </c:forEach>
39     </table>
40     <z:page pageBean="${pageBean }"></z:page>
41     
42 </body>
43 </html>

运行结果：

posted on 2019-07-20 11:59 灰羽枫林阅读(174) 评论(0) 编辑收藏举报