利用struts2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）
<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.lww</groupId>
<artifactId>T224_struts</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>T224_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>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>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.40</version>
</dependency>
</dependencies>
<build>
<finalName>T224_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 通用分页
package com.liuwenwu.crud.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.liuwenwu.crud.util.PageBean;
public class PageTag extends BodyTagSupport {
private static final long serialVersionUID = 1L;
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() {
StringBuffer sb = new StringBuffer();
/*
* 拼接向后台提交数据的form表单
* 注意：拼接的form表单中的page参数是变化的，所以不需要保留上一次请求的值
*/
sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");
sb.append("<input type='hidden' name='page'>");
Map<String, String[]> parameterMap = pageBean.getParameterMap();
if(parameterMap != null && parameterMap.size() > 0) {
Set<Entry<String, String[]>> entrySet = parameterMap.entrySet();
for (Entry<String, String[]> entry : entrySet) {
if(!"page".equals(entry.getKey())) {
String[] values = entry.getValue();
for (String val : values) {
sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");
}
}
}
}
sb.append("</form>");
/*
* 展示的分页条
*/
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 href='javascript:gotoPage(1)'>首页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.previousPage()+")'>上一页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.nextPage()+")'>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>");
/*
* 给分页条添加与后台交互的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();
}
}
z.tld自定义标签配置文件
<?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>z</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.liuwenwu.crud.tag.PageTag</tag-class>
<body-content>JSP</body-content>
<attribute>
<!-- 属性名 -->
<name>pageBean</name>
<!-- 属性值是否是必填 -->
<required>true</required>
<!-- 是否支持表达式 -->
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
wed.xml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.liuwenwu.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>
3、编写dao层去访问数据
package com.liuwenwu.crud.dao;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.lang3.StringUtils;
import com.liuwenwu.crud.entity.Clazz;
import com.liuwenwu.crud.util.EntityBaseDao;
import com.liuwenwu.crud.util.PageBean;
public class ClazzDao extends EntityBaseDao<Clazz>{
/**
* 查询分页，查询单条数据公用方法
* @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.isNoneBlank(cname)) {
sql+=" and cname like '%"+cname+"%'";
}
return super.executeQuery(sql, pageBean, Clazz.class);
}
/**
* 新增方法
* @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(sql, new String[] {"cid","cname","cteacher","pic"}, clz);
}
/**
* 修改方法
* @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(sql, new String[] {"cname","cteacher","pic","cid"}, clz);
}
/**
* 删除方法
* @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(sql, new String[] {"cid"}, clz);
}
}
4、web层去调用dao层给前台返回数据
package com.liuwenwu.crud.web;
import java.sql.SQLException;
import java.util.List;
import com.liuwenwu.crud.dao.ClazzDao;
import com.liuwenwu.crud.entity.Clazz;
import com.liuwenwu.crud.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;
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);
// this.result=this.clzDao.list(clz, pageBean);
request.setAttribute("clzList", list);
request.setAttribute("pageBean", pageBean);
} catch (Exception e) {
e.printStackTrace();
}
return "list";
}
/**
* 跳转新增修改页面的公用方法
* @return
*/
public String preSave() {
if(clz.getCid()!=0) {
try {
Clazz c = this.clzDao.list(clz, null).get(0);
request.setAttribute("clz", c);
} catch (Exception e) {
e.printStackTrace();
}
}
return "preSave";
}
/**
* 新增
* @return
*/
public String add() {
try {
result=this.clzDao.add(clz);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
| SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "toList";
}
/**
* 修改
* @return
*/
public String edit() {
try {
this.clzDao.edit(clz);
} catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
| SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "toList";
}
/**
* 删除
* @return
*/
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
<action name="/clz_*" class="com.liuwenwu.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>
6、前端jsp展示页面
<%@ 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="/zking" %>
<!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>班级</h2><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>班级名</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=${c.cid}">删除</a>
<a href="${pageContext.request.contextPath }/sy/clz_preUpload.action?cid=${c.cid}">图片上传</a>
</td>
</tr>
</c:forEach>
</table>
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>
成果：