struts的增删查改
今天给大家带来一个利用struts进行增删查改的demo
第一步：导入相关的pom依赖（struts、自定义标签库的依赖）
<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.wt</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>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>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>
第二步：分页的tag类导入、z.tld、完成web.xml的配置
先进行web.xml的配置
<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.wt.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>
进行z.tld的配置；
<?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>c</short-name>
<uri>/zking</uri>
<tag>
<!--标签库中的标签名 -->
<name>page</name>
<!-- 标签对应的助手类的全路径名 -->
<tag-class>com.wt.crud.tag.PageTag</tag-class>
<!-- JSP -->
<body-content>JSP</body-content>
<attribute>
<!-- 属性 -->
<name>pageBean</name>
<!--属性值是否必填 -->
<required>true</required>
<!-- 是否支持表达式 -->
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
第三步；dao层去访问数据
首先我们先看实体类
package com.wt.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;
}
@Override
public String toString() {
return "Clazz [cid=" + cid + ", cname=" + cname + ", cteacher=" + cteacher + ", pic=" + pic + "]";
}
}
其次我以前写的通用分页，也可以用在这里；
package com.wt.crud.dao;
import java.sql.SQLException;
import java.util.List;
import com.wt.crud.entity.Clazz;
import com.wt.crud.util.BaseDao;
import com.wt.crud.util.PageBean;
import com.wt.crud.util.StringUtils;
public class ClazzDao extends BaseDao<Clazz> {
/**
* 查询所有 查单个数据
* @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.isNotBlank(cname)) {
sql +=" and cname like '%"+cname+"%'";
}
return super.executeQuery(sql, Clazz.class, pageBean);
}
/**增加
* @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(clz, sql, new String [] {"cid","cname","cteacher","pic"});
}
/**
* 编辑
* @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(clz, sql, new String [] {"cname","cteacher","pic","cid"});
}
/**
* 删除
* @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(clz, sql, new String [] {"cid"});
}
}
第四步：web层去调用dao层给前台返回数据
也就是action这个类
package com.wt.crud.web;
import java.sql.SQLException;
import java.util.List;
import com.opensymphony.xwork2.ModelDriven;
import com.wt.crud.dao.ClazzDao;
import com.wt.crud.entity.Clazz;
import com.wt.crud.util.PageBean;
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);
request.setAttribute("clzList", list);
request.setAttribute("pageBean", pageBean);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
e.printStackTrace();
}
return "list";
}
/**
* 跳转编辑界面的公用方法
* @return
*/
public String preSave() {
if(clz.getCid()!=0) {
try {
Clazz c = this.clzdao.list(clz, null).get(0);
request.setAttribute("clz", c);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
e.printStackTrace();
}
}
return "preSave";
}
/**
* 新增
* @return
*/
public String add() {
try {
result = this.clzdao.add(clz);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
| SQLException e) {
e.printStackTrace();
}
return "toList";
}
/**
* 删除
* @return
*/
public String del() {
try {
this.clzdao.del(clz);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
| SQLException e) {
e.printStackTrace();
}
return "toList";
}
/**
* 修改
* @return
*/
public String edit() {
try {
this.clzdao.edit(clz);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
| SQLException e) {
e.printStackTrace();
}
return "toList";
}
@Override
public Clazz getModel() {
return clz;
}
}
第五步；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" namespace="/sy">
<action name="/demo_*" class="com.wt.web.HelloAction" method="{1}">
<result name="rs">/rs.jsp</result>
</action>
<action name="/stack_*" class="com.wt.test.DemoAction" method="{1}">
<result name="rs">/rs.jsp</result>
</action>
<action name="/clz_*" class="com.wt.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>
最后一步就是编写我们的jsp界面了：
首先是首页
<%@ 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="/zking" prefix="z"%>
<!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>
<%=System.currentTimeMillis() %>
<br>
<form action="${pageContext.request.contextPath}/sy/clz_list.action"
method="post">
班级名：<input type="text" name="cname"> <input type="submit"
value="确定">
</form>
<a href="${pageContext.request.contextPath}/sy/clz_preSave.action">新增</a>
<table border="1" width="100%">
<tr>
<td>编号</td>
<td>班级</td>
<td>教员</td>
<td>图片</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=${c.cid}">修改</a>
<a href="${pageContext.request.contextPath}/sy/clz_del.action?cid=${c.cid}">删除</a>
</td>
</tr>
</c:forEach>
</table>
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>
然后就是编辑界面；
<%@ 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 id="bookForm" action="${pageContext.request.contextPath}${clz.cname==null ? '/sy/clz_list.action' : '/sy/clz_edit.action'}" method="post">
cid:<input type="text" name="cid" value="${c.cid }"><br>
cname:<input type="text" name="cname" value="${c.cname }"><br>
cteacher:<input type="text" name="price" value="${c.cteacher }"><br>
<input type="submit" value="提交" ><br>
</form>
</body>
</html>