Struts的增删改查
准备工作：导入通用分页的tag类，以及d.tld,还有完成xml的配置，在导入我们昨天导入的xml
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.caoguangli.crud.util.EncodingFiter</filter-class> </filter> <filter-mapping> <filter-name>encodingFiter</filter-name> <url-pattern>*.action</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>
先建立一个实体类（clazz）添加属性（图片给个默认值）再写clazzdao，在clazzdao补充增删改查即可，再用ClazzAction调用dao层给前台传数据，再配置昨天导入的struts_sy.xml后写完JSP页面接收数据就完成了
代码：
clazzaction：
package .xhp.clazzaction; import java.sql.SQLException; import java.util.List; import com.caoguangli.crud.dao.ClazzDao; import com.caoguangli.crud.entity.Clazz; import com.caoguangli.crud.util.BaseAction; import com.caoguangli.crud.util.PageBean; import com.opensymphony.xwork2.ModelDriven; public class ClazzAction extends BaseAction implements ModelDriven<Clazz> { private Clazz clazz = new Clazz(); private ClazzDao clazzDao = new ClazzDao(); /** * 查询方法 * @return * @throws InstantiationException * @throws IllegalAccessException * @throws SQLException */ public String list() throws InstantiationException, IllegalAccessException, SQLException { PageBean pageBean = new PageBean(); pageBean.setRequest(request); List<Clazz> list = this.clazzDao.list(clazz, pageBean); request.setAttribute("clazzList", list); request.setAttribute("pageBean", pageBean); return "list"; } /** * 跳转编辑页面（新增修改页面） * @return */ public String preSave() { if(clazz.getCid() != 0) { try { this.result = this.clazzDao.list(clazz, null).get(0); } catch (InstantiationException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return "preSave"; } public String add() { try { this.clazzDao.add(clazz); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "toList"; } public String edit() { try { this.clazzDao.edit(clazz); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException | SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return "toList"; } public String del() { try { this.clazzDao.del(clazz); } 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 clazz; } }
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>班级编辑界面</title> </head> <body> <form action="${pageContext.request.contextPath}${result.cname == null ? '/sy/clazz_add.action' : '/sy/clazz_edit.action' }" method="post"> <%-- <input type="hidden" name="methodName" value="${book.bname == null ? 'add' : 'edit' }"> --%> cid：<input type="text" name="cid" value="${result.cid }"><br> cname：<input type="text" name="cname" value="${result.cname }"><br> cteacher：<input type="text" name="cteacher" value="${result.cteacher }"><br> <input type="submit"> </form> </body> </html>
完成
