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）
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.lww</groupId> <artifactId>T224_struts</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>T224_struts Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <version>2.5.13</version> </dependency> <!-- 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> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.40</version> </dependency> </dependencies> <build> <finalName>T224_struts</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.7.0</version> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF-8</encoding> </configuration> </plugin> </plugins> </build> </project>
2、分页的tag类导入、z.tld、完成web.xml的配置
PageTag 通用分页
package com.liuwenwu.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.liuwenwu.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; 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自定义标签配置文件
<?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> <!-- 标签库中的标签名 --> <name>page</name> <!-- 标签对应的助手类的全路径名 --> <tag-class>com.liuwenwu.crud.tag.PageTag</tag-class> <body-content>JSP</body-content> <attribute> <!-- 属性名 --> <name>pageBean</name> <!-- 属性值是否是必填 --> <required>true</required> <!-- 是否支持表达式 --> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
wed.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.liuwenwu.crud.util.EncodingFiter</filter-class> </filter> <filter-mapping> <filter-name>encodingFiter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter> <filter-name>struts</filter-name> <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> </web-app>
3、编写dao层去访问数据
package com.liuwenwu.crud.dao; import java.sql.SQLException; import java.util.List; import org.apache.commons.lang3.StringUtils; import com.liuwenwu.crud.entity.Clazz; import com.liuwenwu.crud.util.EntityBaseDao; import com.liuwenwu.crud.util.PageBean; public class ClazzDao extends EntityBaseDao<Clazz>{ /** * 查询分页，查询单条数据公用方法 * @param clz * @param pageBean * @return * @throws InstantiationException * @throws IllegalAccessException * @throws SQLException */ public List<Clazz> list(Clazz clz,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{ 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.isNoneBlank(cname)) { sql+=" and cname like '%"+cname+"%'"; } return super.executeQuery(sql, pageBean, Clazz.class); } /** * 新增方法 * @param clz * @return * @throws NoSuchFieldException * @throws SecurityException * @throws IllegalArgumentException * @throws IllegalAccessException * @throws SQLException */ public int add(Clazz clz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException { String sql="insert into t_struts_class values(?,?,?,?)"; return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clz); } /** * 修改方法 * @param clz * @return * @throws NoSuchFieldException * @throws SecurityException * @throws IllegalArgumentException * @throws IllegalAccessException * @throws SQLException */ public int edit(Clazz clz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException { String sql="update t_struts_class set cname=?,cteacher=?,pic=? where cid=?"; return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clz); } /** * 删除方法 * @param clz * @return * @throws NoSuchFieldException * @throws SecurityException * @throws IllegalArgumentException * @throws IllegalAccessException * @throws SQLException */ public int del(Clazz clz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException { String sql="delete from t_struts_class where cid=?"; return super.executeUpdate(sql, new String[] {"cid"}, clz); } }
4.编写web去调用dao层给前台返回数据
package com.liuwenwu.crud.web; import java.sql.SQLException; import java.util.List; import com.liuwenwu.crud.dao.ClazzDao; import com.liuwenwu.crud.entity.Clazz; import com.liuwenwu.crud.util.PageBean; import com.opensymphony.xwork2.ModelDriven; public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{ private ClazzDao clzDao=new ClazzDao(); private Clazz clz=new Clazz(); public String list() { PageBean pageBean=new PageBean(); pageBean.setRequest(request); try { List<Clazz> list= this.clzDao.list(clz, pageBean); // this.result=this.clzDao.list(clz, pageBean); request.setAttribute("clzList", list); request.setAttribute("pageBean", pageBean); } catch (Exception e) { e.printStackTrace(); } return "list"; } /** * 跳转新增修改页面的公用方法 * @return */ public String preSave() { if(clz.getCid()!=0) { try { Clazz c = this.clzDao.list(clz, null).get(0); request.setAttribute("clz", c); } catch (Exception e) { e.printStackTrace(); } } return "preSave"; } /** * 新增 * @return */ public String add() { try { result=this.clzDao.add(clz); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "toList"; } /** * 修改 * @return */ public String edit() { try { this.clzDao.edit(clz); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "toList"; } /** * 删除 * @return */ public String del() { try { this.clzDao.del(clz); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException 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
<action name="/clz_*" class="com.liuwenwu.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>
6、前端jsp展示页面
<%@ 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> <h2>班级</h2><br> <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=${c.cid}">修改</a> <a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid}">删除</a> <a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">图片上传</a> </td> </tr> </c:forEach> </table> <z:page pageBean="${pageBean }"></z:page> </body> </html>
成果：
