struts 的 crud
1、导入相关的pom依赖（struts、自定义标签库的依赖）
2、分页的tag类导入、mytag.tld、完成web.xml的配置
3、dao层去访问数据
4、web层去调用dao层给前台返回数据
5、在struts_sy.xml进行配置
6、写jsp
pom依赖
<!-- 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>
pageTag(通用分页)
package com.chenjiahao.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.chenjiahao.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();
}
}
自定义标签库
mytag.tld
<taglib xmls="http://java.sun.com/JSP/TagLibraryDescriptor"> <!-- 定义标签库的版本 --> <tlib-version>1.0</tlib-version> <!-- 规范的版本 --> <jsp-version>1.2</jsp-version> <short-name>Simple Tags</short-name> <!-- 自定义标签库名称 --> <uri>/Zking</uri> <!-- 自定义h标签 --> <!-- 标签 --> <tag> <!-- 标签名字 --> <name>page</name> <!-- 标签的助手类 --> <tag-class>com.chenjiahao.crud.tag.PageTag</tag-class> <!-- 标签的内容类型;empty表示空标签(使用空标签会报错)，jsp表示可以为任何合法的jsp元素 --> <body-content>JSP</body-content> <!-- 标签属性 --> <attribute> <!-- 标签属性名 --> <name>pageBean</name> <!-- 是否必需的 --> <required>true</required> <!-- 是否支持动态数据 --> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
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.chenjiahao.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>
dao层
package com.chenjiahao.crud.dao;
import java.util.List;
import com.chenjiahao.crud.entity.Clazz;
import com.chenjiahao.crud.util.EntityBaseDao;
import com.chenjiahao.crud.util.PageBean;
import com.chenjiahao.crud.util.StringUtils;
public class ClazzDao extends EntityBaseDao<Clazz>{
/**
* 查询分页方法，查询单条数据公共的方法
* @param clz
* @param pageBean
* @return
* @throws Exception
*/
public List<Clazz> list(Clazz clz,PageBean pageBean)throws Exception{
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, pageBean, Clazz.class);
}
/**
* 新增方法
* @param clz
* @return
* @throws Exception
*/
public int add(Clazz clz) throws Exception{
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 Exception
*/
public int edit(Clazz clz) throws Exception{
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 Exception
*/
public int del(Clazz clz) throws Exception{
String sql="delete from t_struts_class where cid=?";
return super.executeUpdate(sql, new String[] {"cid"}, clz);
}
}
web层调用dao返回数据给jsp
package com.chenjiahao.crud.web;
import java.util.List;
import com.chenjiahao.crud.dao.ClazzDao;
import com.chenjiahao.crud.entity.Clazz;
import com.chenjiahao.crud.util.BaseAction;
import com.chenjiahao.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() throws Exception {
PageBean pageBean=new PageBean();
pageBean.setRequest(request);
List<Clazz> list=this.clzDao.list(clz, pageBean);
request.setAttribute("clzList", list);
request.setAttribute("pageBean", pageBean);
return "list";
}
/**
* 跳转新增修改页面的公共方法
* @return
*/
public String preSave()throws Exception{
if(clz.getCid()!=0) {
Clazz c= this.clzDao.list(clz, null).get(0);
request.setAttribute("clz", c);
}
return "preSave";
}
/**
* 新增
* @return
* @throws Exception
*/
public String add()throws Exception {
result=this.clzDao.add(clz);
return "toList";
}
/**
* 修改
* @return
* @throws Exception
*/
public String edit()throws Exception {
this.clzDao.edit(clz);
return "toList";
}
/**
* 删除
* @return
* @throws Exception
*/
public String del() throws Exception{
this.clzDao.del(clz);
return "toList";
}
@Override
public Clazz getModel() {
// TODO Auto-generated method stub
return clz;
}
}
struts_sy.xml配置
<action name="/clz_*" class="com.chenjiahao.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>
jspy页面
clzList.jsp
<%@ 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>
<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>
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>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath }${clz.cname == null ? '/sy/clz_add.action' : '/sy/clz_edit.action'}" method="post">
cid:<input type="text" name="cid" value="${clz.cid }"/>
cname:<input type="text" name="cname" value="${clz.cname }"/>
cteacher:<input type="text" name="cteacher" value="${clz.cteacher }"/>
<input type="submit"/>
</form>
</body>
</html>
