struts的增删查改
2024-06-03 02:40:20
目录：
entity
clazz
Dao
calzzDao
tag
pageTag
web
clazzAction
util
BaseAction
BaseDao
PageBean
配置文件
web.xml
z.tld
struts.xml
pom.xml
jsp页面
clzList.jsp
clzEdit.jsp
entity
package com.liuxia.crud.entity;
public class Clazz {private int cid;private String cname;private String cteacher;private String pic;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;}
}ClazzDao
package com.liuxia.crud.dao;import java.sql.SQLException;
import java.util.List;import com.liuxia.crud.entity.Clazz;
import com.liuxia.crud.util.BaseDao;
import com.liuxia.crud.util.PageBean;
import com.liuxia.crud.util.StringUtils;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.isNotBlank(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=? where cid=?";return super.executeUpdate(sql,new String[] {"cname","cteacher","pic","cid"}, clazz);}}pageTag
package com.liuxia.crud.tag;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;public class PageTag extends BodyTagSupport {private static final long serialVersionUID = -8476740758233598045L;private PageBean pageBean;@Overridepublic int doStartTag() throws JspException {JspWriter out = pageContext.getOut();try {out.write(toHTML());} catch (IOException e) {e.printStackTrace();}return super.doStartTag();}public String toHTML() {
// pageBean=new PageBean();StringBuffer sb=new StringBuffer();//下一次请求提交到后台的表单html代码拼接sb.append("<link rel=\"stylesheet\" type=\"text/css\" href=\"css/bootstrap.min.css\"/>");sb.append("<script type=\"text/javascript\" src=\"js/jquery-3.3.1.js\"></script>");sb.append("<script type=\"text/javascript\" src=\"js/bootstrap.min.js\"></script>");sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");Map<String, String[]> paramMap = pageBean.getParamMap();if(paramMap!=null&¶mMap.size()>0) {for(Entry<String, String[]> entry:paramMap.entrySet()) {if(!"page".equals(entry.getKey())) {for(String val:entry.getValue()) {sb.append("<input type='hidden' name='"+entry.getKey()+"'> value='"+val+"'");}}}}sb.append("<input type='hidden' name='page'>");sb.append("</form>");//分页条html代码拼接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 ");sb.append(" <a href='javascript:gotoPage(1)' class='btn btn-default'>首页</a> <a");sb.append(" href='javascript:gotoPage("+pageBean.getPreviousPage()+")' class='btn btn-default'>上一页</a> <a");sb.append(" href='javascript:gotoPage("+pageBean.getNextPage()+")' class='btn btn-default'>下一页</a> <a");sb.append(" href='javascript:gotoPage("+pageBean.getMaxPage()+")' class='btn btn-default'>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()' class='btn btn-default'>Go</a>");sb.append(" </div>");//分页所需要调用的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();}public PageBean getPageBean() {return pageBean;}public void setPageBean(PageBean pageBean) {this.pageBean = pageBean;}
}ClazzAction
package com.liuxia.crud.web;import java.sql.SQLException;
import java.util.List;import com.liuxia.crud.dao.ClazzDao;
import com.liuxia.crud.entity.Clazz;
import com.liuxia.crud.util.BaseAction;
import com.liuxia.crud.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{private Clazz clz=new Clazz();private ClazzDao clazzDao=new ClazzDao();/*** 查所有* * @return* @throws SQLException * @throws InstantiationException * @throws IllegalAccessException * @throws IllegalArgumentException */public String list() throws InstantiationException, IllegalAccessException, SQLException {PageBean pageBean=new PageBean();pageBean.setRequest(request);List<Clazz> list = this.clazzDao.list(clz, pageBean);request.setAttribute("clzList",list);request.setAttribute("pageBean",pageBean);return "list";}/*** 跳转新增修改页面的公用方法* * @return* @throws SQLException * @throws InstantiationException * @throws IllegalAccessException * @throws IllegalArgumentException */public String preSave() {if(clz.getCid()!=0) {try {this.result = this.clazzDao.list(clz,null).get(0);} catch (InstantiationException | IllegalAccessException | SQLException e) {e.printStackTrace();}}return "preSave";}/*** 新增方法* @return*/public String add() {try {this.code = this.clazzDao.add(clz);} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException| SQLException e) {e.printStackTrace();}return "toList";}public String edit() {try {this.clazzDao.edit(clz);} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException| SQLException e) {e.printStackTrace();}return "toList";}public String del() {try {this.clazzDao.del(clz);} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException| SQLException e) {e.printStackTrace();}return "toList";}@Overridepublic Clazz getModel() {return clz;}}BaseAction
package com.liuxia.crud.util;import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;/*** 每一个开发的子控制器要用的属性都定义在通用的action中。* @author Administrator**/
public class BaseAction implements ServletRequestAware, ServletResponseAware{/*** 为了传值使用*/protected HttpServletResponse response;protected HttpServletRequest request;protected HttpSession session;protected ServletContext application;/*** 为了配置跳转页面所用*/protected final static String SUCCESS = "success";protected final static String FAIL = "fail";protected final static String LIST = "list";protected final static String ADD = "add";protected final static String EDIT = "edit";protected final static String DETAIL = "detail";/*** 具体传值字段 后端向jsp页面传值所用字段*/protected Object result;protected Object msg;protected int code;public Object getResult() {return result;}public Object getMsg() {return msg;}public int getCode() {return code;}@Overridepublic void setServletResponse(HttpServletResponse arg0) {this.response = arg0;}@Overridepublic void setServletRequest(HttpServletRequest arg0) {this.request = arg0;this.session = arg0.getSession();this.application = arg0.getServletContext();}
}BaseDao
package com.liuxia.crud.util;import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;import com.liuxia.crud.entity.Clazz;public class BaseDao<T> {/*** T=Student.class* * @param sql 决定查询哪张表的数据* @param clz 查询出来的数据封装到哪个实体类中* @param pageBean 决定是否分页* @return* @throws * @throws InstantiationException * @throws SQLException * @throws IllegalAccessException * @throws IllegalArgumentException * @throws InstantiationException */public List<T> executeQuery(String sql,Class clz,PageBean pageBean) throws SQLException, IllegalArgumentException, IllegalAccessException, InstantiationException {List<T> ls=new ArrayList<>();Connection con=DBAccess.getConnection();PreparedStatement ps = null;ResultSet rs = null;if(pageBean!=null && pageBean.isPagination()) {//该分页了String countSql=getCountSql(sql);//获取符合记录的行数的Sql语句try {ps=con.prepareStatement(countSql);} catch (SQLException e) {e.printStackTrace();}try {rs=ps.executeQuery();} catch (SQLException e) {e.printStackTrace();}if(rs.next()) {pageBean.setTotal(rs.getLong(1)+"");//给pageBean的总页数赋值}String pageSql=getPageSql(sql,pageBean);//拼接上符合条件的分页查询sql语句ps=con.prepareStatement(pageSql);rs=ps.executeQuery();}else {ps = con.prepareStatement(sql);rs = ps.executeQuery();}try {while (rs.next()) {// ls.add(new Book(rs.getInt("bid"),// rs.getString("bname"),// rs.getFloat("price")));/*** 1、创建了一个book对象* 2、从ResultSet结果集中获取值放入Book对象属性中* 2.1获取到book的属性对象* 2.2给属性对象赋值* 3、将已经有值的Book对象放进list集合中* */T t = (T) clz.newInstance();Field[] fields = clz.getDeclaredFields();for (Field field : fields) {field.setAccessible(true);field.set(t, rs.getObject(field.getName()));}ls.add(t);} } finally {DBAccess.close(con,ps,rs);}return ls;}/*** 将原生sql拼接出符合条件的某一页的数据查询* @param sql* @return*/private String getPageSql(String sql,PageBean pageBean) {return sql + " limit "+pageBean.getStartIndex()+","+pageBean.getRows();}/*** 用原生sql拼接出查询符合条件的记录数* @param sql* @return*/private String getCountSql(String sql) {return "select count(1) from ("+sql+") t";}/*** 通用的增删改方法* @param sql 增删改的sql语句* @param attrs ？所代表的实体类的属性* @param t 实体类的实例* @return* @throws SQLException* @throws NoSuchFieldException* @throws SecurityException* @throws IllegalArgumentException* @throws IllegalAccessException*/public int executeUpdate(String sql, String[] attrs, T t) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {Connection con = DBAccess.getConnection();PreparedStatement pst = con.prepareStatement(sql);for (int i = 0; i < attrs.length; i++) {Field field = t.getClass().getDeclaredField(attrs[i]);field.setAccessible(true);pst.setObject(i+1, field.get(t));}return pst.executeUpdate();}
}PageBean
package com.liuxia.crud.util;import java.util.HashMap;
import java.util.Map;import javax.servlet.http.HttpServletRequest;/*** 分页工具类**/
public class PageBean {private int page = 1;// 页码private int rows = 3;// 页大小private int total = 0;// 总记录数private boolean pagination = true;// 是否分页private String url;private Map<String, String[]> paramMap = new HashMap<>();// 定义初始化方法，存入上一次请求的值public void setRequest(HttpServletRequest req) {this.setPage(req.getParameter("page"));this.setRows(req.getParameter("rows"));this.setPagination(req.getParameter("pagination"));// getRequestURL获取到浏览器请求的全路径this.setUrl(req.getRequestURL().toString());// getParameterMap可以获取到一次url请求所携带的所有参数this.setParamMap(req.getParameterMap());}public void setPagination(String pagination) {if (StringUtils.isNotBlank(pagination)) {this.setPagination(!"false".equals(pagination));}}public void setRows(String rows) {if (StringUtils.isNotBlank(rows))this.setRows(Integer.valueOf(rows));}public void setPage(String page) {if (StringUtils.isNotBlank(page)) {this.setPage(Integer.valueOf(page));}}public PageBean() {super();}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public Map<String, String[]> getParamMap() {return paramMap;}public void setParamMap(Map<String, String[]> paramMap) {this.paramMap = paramMap;}public int getPage() {return page;}public void setPage(int page) {this.page = page;}public int getRows() {return rows;}public void setRows(int rows) {this.rows = rows;}public int getTotal() {return total;}public void setTotal(int total) {this.total = total;}public void setTotal(String total) {this.total = Integer.parseInt(total);}public boolean isPagination() {return pagination;}public void setPagination(boolean pagination) {this.pagination = pagination;}/*** 获得起始记录的下标* * @return*/public int getStartIndex() {return (this.page - 1) * this.rows;}@Overridepublic String toString() {return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";}/*** 获取到总页数* @return*/public int getMaxPage() {return this.total % this.rows == 0 ? this.total / this.rows : (this.total / this.rows) + 1;}/*** 获取下一页页码* @return*/public int getNextPage() {return this.page < this.getMaxPage() ? this.page+1 : this.page;}/*** 获取上一页页码* @return*/public int getPreviousPage() {return this.page > 1 ? this.page-1 : this.page;}
}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.liuxia.crud.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>z.tld
<?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>dj 1.1 core library</description><display-name>dj core</display-name><tlib-version>1.1</tlib-version><short-name>d</short-name><uri>/liuxia</uri><tag><name>page</name><tag-class>com.liuxia.crud.tag.PageTag</tag-class><body-content>JSP</body-content><attribute><name>pageBean</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute></tag></taglib>struts.xml
<?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" namespace="/sy"><action name="/hello_*" class="com.liuxia.web.HelloAction" method="{1}"><result name="success">/success.jsp</result></action><action name="/demo_*" class="com.liuxia.ognl.Demo7" method="{1}"><result name="success">/success.jsp</result></action><action name="/clz_*" class="com.liuxia.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></package>
</struts>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.liuxia.web</groupId><artifactId>StrutsDemp</artifactId><packaging>war</packaging><version>0.0.1-SNAPSHOT</version><name>StrutsDemp 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>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></dependencies><build><finalName>StrutsDemp</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>jsp页面
clzList.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@ taglib uri="/liuxia" prefix="d" %>
<!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>班级主界面</title>
</head>
<body>
<h2>小说目录</h2><br><form action="${pageContext.request.contextPath}/sy/clz_list.action"method="post">书名：<input type="text" name="bname"> <input type="submit"value="确定"><input type="hidden" name="rows" value="15"></form><a href="${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>班级图片</td><td>操作</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=${b.cid}">文件上传</a></td></tr></c:forEach></table><d:page pageBean="${pageBean }"></d: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>班级编辑界面</title>
</head>
<body><form action="${pageContext.request.contextPath}${result.cname == null ? '/sy/clz_add.action' : '/sy/clz_edit.action' }" method="post">ID：<input type="text" name="cid" value="${result.cid }"><br>名称：<input type="text" name="cname" value="${result.cname }"><br>教员：<input type="text" name="cteacher" value="${result.cteacher }"><br><input type="submit" value="ok">
</form>
</body>
</html>
：效果：
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