利用struts2完成增刪改查

　　1、導入相關的pom依賴（struts、自定義標簽庫的依賴）

<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、分頁的tag類導入、z.tld、完成web.xml的配置

PageTag 通用分頁

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;}@Overridepublic 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();/** 拼接向后臺提交數據的form表單* 注意：拼接的form表單中的page參數是變化的，所以不需要保留上一次請求的值*/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>");/** 展示的分頁條*/sb.append("<div style='text-align: right; font-size: 12px;'>");sb.append("每頁"+pageBean.getRows()+"條，共"+pageBean.getTotal()+"條，第"+pageBean.getPage()+"頁，共"+pageBean.getMaxPage()+"頁&nbsp;&nbsp;<a href='javascript:gotoPage(1)'>首頁</a>&nbsp;&nbsp;<a");sb.append(" href='javascript:gotoPage("+pageBean.previousPage()+")'>上一頁</a>&nbsp;&nbsp;<a");sb.append(" href='javascript:gotoPage("+pageBean.nextPage()+")'>下一頁</a>&nbsp;&nbsp;<a");sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾頁</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>");/** 給分頁條添加與后臺交互的js代碼*/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('請輸入1~N的數字');");sb.append(" return;");sb.append(" }");sb.append(" gotoPage(page);");sb.append(" }");sb.append("</script>");return sb.toString();} }

z.tld自定義標簽配置文件

<?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><!-- 標簽庫中的標簽名 --><name>page</name><!-- 標簽對應的助手類的全路徑名 --><tag-class>com.liuwenwu.crud.tag.PageTag</tag-class><body-content>JSP</body-content><attribute><!-- 屬性名 --><name>pageBean</name><!-- 屬性值是否是必填 --><required>true</required><!-- 是否支持表達式 --><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、編寫dao層去訪問數據

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>{/*** 查詢分頁，查詢單條數據公用方法* @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);}/*** 刪除方法* @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、web層去調用dao層給前臺返回數據

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";}/*** 跳轉新增修改頁面的公用方法* @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";}/*** 刪除* @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";}@Overridepublic Clazz getModel() {// TODO Auto-generated method stubreturn clz;}}

5、在struts_sy.xml進行配置

<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展示頁面

<%@ 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>班級</h2><br><form action="${pageContext.request.contextPath }/sy/clz_list.action" method="post">班級名：<input type="text" name="cname"><input type="submit" value="確定"></form><a href="${pageContext.request.contextPath }/sy/clz_preSave.action">新增</a><table border="1" width="100%"><tr><td>編號</td><td>班級名</td><td>教員</td><td>圖片</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=${c.cid}">修改</a>&nbsp;&nbsp;<a href="${pageContext.request.contextPath }/sy/clz_del.action?cid=${c.cid}">刪除</a>&nbsp;&nbsp;<a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">圖片上傳</a>&nbsp;&nbsp;</td></tr> </c:forEach></table><z:page pageBean="${pageBean }"></z:page></body> </html>

成果：

轉載于:https://www.cnblogs.com/liuwenwu9527/p/11108611.html

總結

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