思路
利用struts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)本篇为下篇作为铺垫。
<!-- 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>
Struts标签的使用
s:iterator
S:action
S:url
S:form
s:textfield
S:select
S:radio
S:param
s:textarea
- 不直接跳页面，跳子控制器，因为路径问题和*.action配置
- 修改页面弹栈的问题，load出的结果作为跟，属性可以直接取值
- 页面样式问题 theme
<table border="1" width="100%">
<tr>
<td>序号</td>
<td>学号</td>
<td>姓名</td>
<td>拼音</td>
<td>性别</td>
<td>标记</td>
<td>班级</td>
<td>操作</td>
</tr>
<s:iterator var="s" value="result">
<tr>
<td>序号</td>
<td><s:property value="#s.sid"/></td>
<td><s:property value="#s.sname"/></td>
<td><s:property value="#s.spin"/></td>
<td><s:property value="#s.sex"/></td>
<td><s:property value="#s.mark"/></td>
<td><s:property value="#s.cname"/></td>
<td>
</td>
</tr>
</s:iterator>
</table>
第一步导入以前的工具类和自定义标签库
mvc自定义框架(下)之增删改查学习过的。
web.xml配置乱码处理
EncodingFiter
<filter>
<filter-name>encodingFiter</filter-name>
<filter-class>com.myy.three.util.EncodingFiter</filter-class>
</filter>
<filter-mapping>
<filter-name>encodingFiter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
实体类：Clazz
package com.myy.three.entity;
public class Clazz {
private int cid;
private String cname;
private String cteacher;
private String pic = "无";
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;
}
public Clazz(int cid, String cname, String cteacher, String pic) {
super();
this.cid = cid;
this.cname = cname;
this.cteacher = cteacher;
this.pic = pic;
}
public Clazz() {
super();
}
public String toString() {
return "Clazz [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
}
}
ClzDao
package com.myy.three.dao;
import java.sql.SQLException;
import java.util.List;
import com.myy.three.entity.Clazz;
import com.myy.three.util.BaseDao;
import com.myy.three.util.PageBean;
import com.myy.three.util.StringUtils;
/**
* 操作数据库
* @author myy
*
*/
public class ClzDao extends BaseDao<Clazz>{
/**
* 班级列表查询(带分页)
* @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(StringUtils.isNotBlank(cname)) {
sql +=" and cname like '%"+cname+"%'";
}
if(cid != 0) {
sql += " and cid = "+cid;
}
return super.executeQuery(sql, Clazz.class, pageBean);
}
/**
* 班级信息的增加
* @param clz
* @return
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws SQLException
*/
public int add(Clazz clz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
String sql = "insert into t_struts_class values(?,?,?,?)";
return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clz);
}
/**
* 班级信息的删除
* @param clz
* @return
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws SQLException
*/
public int del(Clazz clz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
String sql = "delete from t_struts_class where cid = ? ";
return super.executeUpdate(sql, new String[] {"cid"}, clz);
}
/**
* 班级信息的修改
* @param clz
* @return
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws SQLException
*/
public int edit(Clazz clz) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException, SQLException {
String sql = "update t_struts_class set cname=?,cteacher=?,pic=? where cid = ? ";
return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clz);
}
}
工具类
package com.myy.three.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;
}
public void setServletResponse(HttpServletResponse arg0) {
this.response = arg0;
}
public void setServletRequest(HttpServletRequest arg0) {
this.request = arg0;
this.session = arg0.getSession();
this.application = arg0.getServletContext();
}
}
web层ClzAction
package com.myy.three.web;
import java.sql.SQLException;
import com.myy.three.dao.ClzDao;
import com.myy.three.entity.Clazz;
import com.myy.three.util.BaseAction;
import com.myy.three.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;
public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{
private ClzDao clzDao = new ClzDao();
private Clazz clz = new Clazz();
/**
* 查询班级列表的方法
* @return
*/
public String list() {
PageBean pageBean = new PageBean();
pageBean.setRequest(request);
try {
this.result = clzDao.list(clz, pageBean);
request.setAttribute("pageBean", pageBean);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
e.printStackTrace();
}
return "list";
}
/**
* 跳转编辑页面(新增编辑页面是同一张)
* @return
*/
public String preSave() {
// 什么时候跳转新增页面？什么时候跳转编辑页面？
// 区别在于跳编辑页面的时候需要传递cid到后台进行查询,并且将查询到的数据进行回显?
int cid = clz.getCid();
if(cid !=0 ) {
try {
this.result = clzDao.list(clz, null).get(0);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
e.printStackTrace();
}
}
return "preSave";
}
/**
* 增加班级信息
* @return
*/
public String add() {
try {
this.code = this.clzDao.add(clz);
} catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
| SQLException e) {
e.printStackTrace();
}
return "toList";
}
/**
* 修改班级信息
* @return
*/
public String edit() {
try {
this.code = this.clzDao.edit(clz);
} catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
| SQLException e) {
e.printStackTrace();
}
return "toList";
}
/**
* 删除班级信息
* @return
*/
public String del() {
try {
this.code = this.clzDao.del(clz);
} catch (IllegalArgumentException | IllegalAccessException | NoSuchFieldException | SecurityException
| SQLException e) {
e.printStackTrace();
}
return "toList";
}
@Override
public Clazz getModel() {
return clz;
}
}
配置
<action name="clz_*" class="com.myy.three.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.写jsp默认是：forward
chain：Action链式处理的结果类型，也就是将结果转发到这个action中。
redirect：实际上dispatcher和redirect的区别就是在于转发和重定向的区别。
redirectAction：用于直接redirectaction。
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="/myy" prefix="m"%>
<!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>班级主页</title>
</head>
<body>
<h2>班级目录</h2>
<br>
<form action="${pageContext.request.contextPath}/sy/clz_list.action"
method="post">
<!-- <input type="hidden" name="rows" value="20"> -->
班级名称：<input type="text" name="cname">
<input type="submit"
value="确定">
</form>
<a href="${pageContext.request.contextPath}/sy/clz_preSave.action">新增</a>
<table border="1" width="100%">
<tr>
<td>编号</td>
<td>班级名称</td>
<td>教员</td>
<td>图片</td>
<td>操作</td>
</tr>
<c:forEach items="${result }" var="c">
<tr>
<td>${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=${c.cid}">删除</a>
</td>
</tr>
</c:forEach>
</table>
<m:page pageBean="${pageBean}"></m: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>书籍的编辑页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath}${result.cname == null ? '/sy/clz_add.action' : '/sy/clz_edit.action'}" method="post">
编号:<input type="text" value="${result.cid}" name="cid"><br>
班级名称:<input type="text" value="${result.cname}" name="cname"><br>
教员:<input type="text" value="${result.cteacher}" name="cteacher"><br>
<%-- 图片:<input type="text" value="${result.pic}" name="pic"><br> --%>
<input type="submit" value="确认">
</form>
</body>
</html>
运行结果：
新增：
修改：
