Struts的增删改查
1、导入相关的pom依赖（struts、自定义标签库的依赖）
pom.xml
<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.zking</groupId> <artifactId>struts</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>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>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.44</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> <scope>provided</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>2.5.16</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> </dependencies> <build> <finalName>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
package com.jt.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.jt.util.PageBean; public class PageTag extends BodyTagSupport { private static final long serialVersionUID = -553969530960334073L; 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() { // TODO Auto-generated method stub StringBuilder sb=new StringBuilder(); //拼接下一次发送请求所要提交得隐藏得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namepage得参数，但是改参数在前面以及单独赋值 //为什么要单独赋值？因为上一次请求时第一页得数据，下一次可能时第二页，以后这前后请求page对应得值不一样，需要单独赋值 if(!"page".equals(entry.getKey())) { // <input type='hidden' name='hobby' value='1'> // <input type='hidden' name='hobby' value='2'> //[1,2] 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 <a "); sb.append(" href='javascript:gotoPage(1)'>首页</a> <a"); sb.append(" href='javascript:gotoPage("+pageBean.getpreviousPage()+")'>上一页</a> <a"); sb.append(" href='javascript:gotoPage("+pageBean.getNextPage()+")'>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; width: 50px;'> <a"); sb.append(" href='javascript:skipPage()'>Go</a>"); sb.append(" </div>"); //拼接分页所需要得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
<tag>
<!-- 标签库中的标签（类似c:set c:out的定义） -->
<name>page</name>
<!-- 是标签运行具体代码，也是助手类，下面填写的是助手类的全路径名 -->
<tag-class>com.jt.tag.PageTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<!-- 该标签的属性 -->
<name>pageBean</name>
<!-- 该属性是否必填 -->
<required>true</required>
<!-- 是否支持表达式 -->
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
web.xml
<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.jt.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
实体类
Clazz
package com.jt.entity; public class Clazz { private int cid; private String cname; private String cteacher; private String pic="图片暂定"; 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 + "]"; } }
Clazzdao
package com.jt.dao; import java.sql.SQLException; import java.util.List; import org.apache.commons.lang3.StringUtils; import com.jt.entity.Clazz; import com.jt.util.BaseDao; import com.jt.util.PageBean; 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.isNoneBlank(cname)) { sql+=" and cname like '%"+cname+"%'"; } return super.executeQuery(sql,Clazz.class, pageBean); } public int add(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException { String sql="insert into t_struts_class values(?,?,?,?)"; return super.executeupdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz); } public int del(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException { String sql="delete from t_struts_class where cid=?"; return super.executeupdate(sql, new String[] {"cid"}, clazz); } public int edit(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException { String sql="update t_struts_class set cname=?,cteacher=?,pic=?"; return super.executeupdate(sql, new String[] {"cname","cteacher","pic","cid"}, clazz); } }
4、web层去调用dao层给前台返回数据
ClazzAction.java
package com.jt.web; import java.sql.SQLException; import java.util.List; import com.jt.dao.ClazzDao; import com.jt.entity.Clazz; import com.jt.util.BaseAction; import com.jt.util.PageBean; import com.opensymphony.xwork2.ModelDriven; public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{ private Clazz clz=new Clazz(); private ClazzDao clzDao=new ClazzDao(); public String list(){ PageBean pageBean =new PageBean(); pageBean.setRequest(request); try { List<Clazz> list = this.clzDao.list(clz, pageBean); 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 (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "toList"; } public String edit() { try { this.clzDao.edit(clz); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "toList"; } 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
<?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" > <action name="/hello_*" class="com.jt.HelloAction" method="{1}"> <result name="success">/success.jsp</result> </action> <action name="/clz_*" class="com.jt.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
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="/jt"%> <!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>小说目录</h2> <br> <form action="${pageContext.request.contextPath}/sy/clz_list.action" method="post"> 书名：<input type="text" name="bname"> <input type="submit" value="确定"> </form> <a href="${pageContext.request.contextPath}/sy/clz_preSave.action">增加</a> <table border="1" width="100%"> <tr> <td>编号</td> <td>班级名称</td> <td>老师</td> <td>班级图片</td> </tr> <c:forEach items="${clzList }" var="b"> <tr> <td>${b.cid }</td> <td>${b.cname }</td> <td>${b.cteacher }</td> <td>${b.pic }</td> <td><a href="${pageContext.request.contextPath}/sy/clz_preSave.action?cid=${b.cid}">修改</a> <a href="${pageContext.request.contextPath}/sy/clz_del.action?cid=${b.cid}">删除</a> <a href="${pageContext.request.contextPath}/sy/clz_preUpload.action?cid=${b.cid}">图片上传</a> </td> </tr> </c:forEach> </table> <z:page pageBean="${pageBean }"></z:page> </body> </html>
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" value="${result.cid }" name="cid"><br> cname:<input type="text" value="${result.cname }" name="cname"><br> cteacher:<input type="text" value="${result.cteacher }" name="cteacher"><br> <input type="submit" value="ok"> </form> </body> </html>
