struts的增删改查

1、导入相关的pom依赖（struts、自定义标签库的依赖）

　　　　<dependency>
   　　　　 <groupId>commons-fileupload</groupId>
  　　　　  <artifactId>commons-fileupload</artifactId>
   　　　　 <version>1.3.1</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>

2、分页的tag类导入、z.tld、完成web.xml的配置

PageTag 

package com.tag;

import java.util.Map;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;

import com.util.PageBean;

public class PageTag extends BodyTagSupport {

    private static final long serialVersionUID = 8003507841172246203L;

    private PageBean pageBean;

    public PageTag() {
        super();
    }

    public PageBean getPageBean() {
        return pageBean;
    }

    public void setPageBean(PageBean pageBean) {
        this.pageBean = pageBean;
    }

    @Override
    public int doStartTag() throws JspException {
        try {
            JspWriter out = pageContext.getOut();
            out.println(this.toHtml());
            return SKIP_BODY;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    private String toHtml() {
        StringBuffer bf = new StringBuffer();
        if (null == pageBean || !pageBean.isPagination()) {
            return bf.toString();
        }

        // 1. 生成表单
        bf.append("<form id='pageBeanForm' action='" + pageBean.getUrl() + "' method='post'>");
        bf.append("<input type='hidden' name='page' value=''>");
        for (Map.Entry<String, String[]> entry : pageBean.getParameterMap().entrySet()) {
            String name = entry.getKey();
            String[] values = entry.getValue();
            if ("page".equals(name)) {
                continue;
            }

            for (String value : values) {
                bf.append("<input type='hidden' name='" + name + "' value='" + value + "'>");
            }
        }
        bf.append("</form>");

        // 2. 生成按钮
        bf.append("<div style='text-align: right;font-size: 12px;'>每页" + pageBean.getRows() + "条，共"
                + pageBean.getTotal() + "条，当前第" + pageBean.getPage() + "页，共" + pageBean.getMaxPage()
                + "页&nbsp;&nbsp;<a href='javascript:doGotoPage(1)'>首&nbsp;&nbsp;页</a>&nbsp;&nbsp;<a href='javascript:doGotoPage("
                + pageBean.getPreviousPage() + ")'>上一页</a>&nbsp;&nbsp;<a href='javascript:doGotoPage("
                + pageBean.getNextPage() + ")'>下一页</a>&nbsp;&nbsp;<a href='javascript:doGotoPage("
                + pageBean.getMaxPage()
                + ")'>尾&nbsp;&nbsp;页</a>&nbsp;&nbsp;<input id='pageNumber' type='text' style='text-align: center; 30px;'>&nbsp;&nbsp;<a href='javascript:doSkipPage();'>GO</a></div>");

        // 3. 动态生成js
        bf.append("<script type='text/javascript'>");
        bf.append("function doGotoPage(page){");
        bf.append("  var form = document.getElementById('pageBeanForm');");
        bf.append("  form.page.value = page;");
        bf.append("  form.submit();");
        bf.append("}");
        bf.append("function doSkipPage(page){");
        bf.append("  var page = document.getElementById('pageNumber').value;");
        bf.append("  if(!page||isNaN(page)||parseInt(page)<1||parseInt(page)>"+pageBean.getMaxPage()+"){");
        bf.append("    alert('页码必须为1~"+pageBean.getMaxPage()+"之间数字');");
        bf.append("    document.getElementById('pageNumber').value = '';");
        bf.append("    return;");
        bf.append("  }");
        bf.append("  doGotoPage(parseInt(page));");
        bf.append("}");
        bf.append("</script>");
        bf.append("");
        bf.append("");
        bf.append("");
        bf.append("");
        bf.append("");
        return bf.toString();
    }
}

z.tld

<!DOCTYPE taglib
  PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
   "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<!-- 标签库描述符 -->
<taglib xmlns="http://java.sun.com/JSP/TagLibraryDescriptor">
    <tlib-version>1.0</tlib-version>
    <jsp-version>1.2</jsp-version>
    <short-name>Simple Tags</short-name>
    <uri>/zking</uri>
    
    
    <tag>
        <name>page</name>
        <tag-class>com.tag.PageTag</tag-class>
        <body-content>empty</body-content>
        <attribute>
            <name>pageBean</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
    
</taglib>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    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.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.factory.StrutsActionProxy</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>*.action</url-pattern>
    </filter-mapping>
</web-app>

3、dao层去访问数据

创建与数据库相对应的实体类

Clazz 

package com.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 + "]";
    }
    
}

ClazzDao

package com.dao;

import java.sql.SQLException;
import java.util.List;

import com.entity.Clazz;
import com.util.BaseDao;
import com.util.PageBean;
import com.util.StringUtils;

public class ClazzDao extends BaseDao<Clazz>{

    /**
     * 查詢
     * @param clazz
     * @param pageBean
     * @return
     * @throws Exception 
     */
    public List<Clazz> list(Clazz clazz,PageBean pageBean) throws Exception{
        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);
    }
    /**
     * 新增
     * @param clazz
     * @return
     * @throws NoSuchFieldException
     * @throws Exception
     */
    public int add(Clazz clazz) throws NoSuchFieldException, Exception {
        String sql="insert into t_struts_class values(?,?,?,?)";
        return super.executeUpdate(sql, new String [] {"cid","cname","cteacher","pic"}, clazz);
    }
    
    /**
     * 删除
     * @param clazz
     * @return
     * @throws NoSuchFieldException
     * @throws Exception
     */
    public int del(Clazz clazz) throws NoSuchFieldException, Exception {
        String sql="delete from t_struts_class where cid=? ";
        return super.executeUpdate(sql, new String [] {"cid"}, clazz);
    }
    
    /**
     * 修改
     * @param clazz
     * @return
     * @throws NoSuchFieldException
     * @throws Exception
     */
    public int edit(Clazz clazz) throws NoSuchFieldException, Exception {
        String sql=" update t_struts_class set cname= ? , chteacher=? ,pic=? where cid=? ";
        return super.executeUpdate(sql, new String [] {"cname","cteacher","pic","cid"}, clazz);
    }
}

4、web层去调用dao层给前台返回数据

ClazzAction

package com.web;

import java.util.List;

import com.dao.ClazzDao;
import com.entity.Clazz;
import com.opensymphony.xwork2.ModelDriven;
import com.util.PageBean;

public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

    private Clazz clz=new Clazz();
    private ClazzDao clazzDao=new ClazzDao();
    
    public String list() {
        PageBean pageBean=new PageBean();
        pageBean.setRequest(request);
        try {
            List<Clazz> list=this.clazzDao.list(clz, pageBean);
            request.setAttribute("clzList", list);
            request.setAttribute("pageBean", pageBean);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "list";
    }
    
    /**
     * 跳转编辑页面(新增修改页面)
     */
    public String preSave() {
        if(clz.getCid()!=0) {
            try {
                this.result=this.clazzDao.list(clz, null).get(0);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return "preSave";
    }
    
    public String add() {
        try {
            this.code=this.clazzDao.add(clz);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";
    }
    
    public String edie() {
        try {
            this.clazzDao.edit(clz);
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";
    }
    
    public String del() {
        try {
            this.clazzDao.del(clz);
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (Exception 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.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页面

clzList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@page isELIgnored="false"%>
<%@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>小说目录</h2>
    <br>

    <form action="${pageContext.request.contextPath}/sy/clazz_list.action"
        method="post">
        班级名称：<input type="text" name="cname"> <input type="submit"
            value="确定"> <input type="hidden" name="rows" value="15">
    </form>
    <a href="${pageContext.request.contextPath}/sy/clazz_preSave.action">增加</a>
    <table border="1" width="100%">
        <tr>
            <td>编号</td>
            <td>班级名称</td>
            <td>教员</td>
            <td>班级图片</td>
            <td>操作</td>
        </tr>
        <c:forEach items="${clazzList }" var="c">
            <tr>
                <td>${c.cid }</td>
                <td>${c.cname }</td>
                <td>${c.cteacher }</td>
                <td>${c.pic }</td>
                <td><a
                    href="${pageContext.request.contextPath}/sy/clazz_preSave.action?cid=${c.cid}">修改</a>&nbsp;
                    <a
                    href="${pageContext.request.contextPath}/sy/clazz_del.action?cid=${c.cid}">删除</a>
                    <a
                    href="${pageContext.request.contextPath}/sy/clazz_preUpload.action?cid=${c.cid}">图片上传</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/clazz_add.action' : '/sy/clazz_edit.action' }"
        method="post">
        <%-- <input type="hidden" name="methodName" value="${book.bname == null ? 'add' : 'edit' }"> --%>
        cid：<input type="text" name="cid" value="${result.cid }"><br>
        cname：<input type="text" name="cname" value="${result.cname }"><br>
        cteacher：<input type="text" name="cteacher"
            value="${result.cteacher }"><br> <input type="submit">
    </form>
</body>
</html>

页面效果