1. 框架
半成品
打jar包
2. 使用自定义mvc框架完成CRUD操作
jsp
action
test
dao
entity
db
3. 增/删/改用重定向,查询用转发
本次目标，完成t_mvc_book表的增删改查
1、通用分页的jar、自定义mvc框架、自定义标签
导入jar、导入之前写好的pageTag、自定义mvc.xml
2、dao层 通用的增删改方法
3、web层
mvc.xml进行配置
4、jsp
导入jar包
导入之前写好的pageTag
package com.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.util.PageBean;
public class PageTag extends BodyTagSupport {
private static final long serialVersionUID = -553969530960334073L;
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() {
// TODO Auto-generated method stub
StringBuilder sb=new StringBuilder();
//拼接下一次发送请求所要提交得隐藏得form表单
sb.append(" <form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'> ");
sb.append(" <input type='hidden' name='page'> ");
Map<String, String[]> paMap = pageBean.getPaMap();
if(paMap!=null&&paMap.size()>0) {
Set<Entry<String, String[]>> entrySet = paMap.entrySet();
for (Entry<String, String[]> entry : entrySet) {
//上一次请求可能携带页码namepage得参数，但是改参数在前面以及单独赋值
//为什么要单独赋值？因为上一次请求时第一页得数据，下一次可能时第二页，以后这前后请求page对应得值不一样，需要单独赋值
if(!"page".equals(entry.getKey())) {
// <input type='hidden' name='hobby' value='1'>
// <input type='hidden' name='hobby' value='2'>
//[1,2]
for(String val:entry.getValue()) {
sb.append(" <input type='hidden' name='"+entry.getKey()+"' value='"+val+"'> ");
}
}
}
}
sb.append(" </form>");
//拼接分页条
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 ");
sb.append(" href='javascript:gotoPage(1)'>首页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.getpreviousPage()+")'>上一页</a> <a");
sb.append(" href='javascript:gotoPage("+pageBean.getNextPage()+")'>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>");
//拼接分页所需要得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();
}
}
MVC.XML
<?xml version="1.0" encoding="UTF-8"?> <!-- config标签:可以包含0~N个action标签 --> <config> <!-- action标签:可以饱含0~N个forward标签 path:以/开头的字符串,并且值必须唯一 非空 type:字符串,非空 --> <action path="/Cal" type="com.web.CalAction"> <forward name="res" path="/res.jsp" redirect="false" /> </action> <action path="/book" type="com.web.BookAction"> <forward name="list" path="/bookList.jsp" redirect="false" /> <forward name="edit" path="/bookEdit.jsp" redirect="false" /> <forward name="tolist" path="/book.action?methodName=list" redirect="false" /> </action> </config>
2、dao层 通用的增删改方法
新建book实体类
package com.entity;
public class Book {
private int bid;
private String bname;
private float price;
public int getBid() {
return bid;
}
public void setBid(int bid) {
this.bid = bid;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
@Override
public String toString() {
return "Book [bid=" + bid + ", bname=" + bname + ", price=" + price + "]";
}
}
在BookDao类增删改查方法
package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import com.entity.Book;
import com.util.BaseDao;
import com.util.DBAccess;
import com.util.PageBean;
import com.util.StringUtils;
public class Bookdao extends BaseDao<Book>{
/**
* 查询所有
* @param book
* @param pageBean
* @return
* @throws InstantiationException
* @throws IllegalAccessException
* @throws SQLException
*/
public List<Book> list(Book book,PageBean pageBean) throws InstantiationException, IllegalAccessException, SQLException{
String sql="select * from t_mvc_book where true ";
String bname=book.getBname();
int bid=book.getBid();
if(StringUtils.isNotBlank(bname)) {
sql+=" and bname like '%"+bname+"%'";
}
if(bid!=0) {
sql+=" and bid=" + bid;
}
return super.executeQuery(sql, Book.class, pageBean);
}
/**
* 修改方法
* @param book
* @return
* @throws SQLException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public int edit(Book book) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
String sql="update t_mvc_book set bname=?,price=? where bid=?";
return super.executeupdate(sql,new String[] {"bname","price","bid"}, book);
}
/**
* 新增
* @param book
* @return
* @throws SQLException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public int add(Book book) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
String sql="insert into t_mvc_book values(?,?,?)";
return super.executeupdate(sql,new String[] {"bid","bname","price"}, book);
}
/**
* 删除
* @param book
* @return
* @throws SQLException
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public int del(Book book) throws SQLException, NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
String sql="delete from t_mvc_book where bid=?";
return super.executeupdate(sql,new String[] {"bid"}, book);
}
}
3、web层
BookAction
package com.web;
import java.sql.SQLException;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.Bookdao;
import com.entity.Book;
import com.framework.ActionSupport;
import com.framework.ModelDrivern;
import com.util.PageBean;
public class BookAction extends ActionSupport implements ModelDrivern<Book>{
private Book book=new Book();
private Bookdao bookDao=new Bookdao();
/**
* 分页查询
* @param req
* @param resp
* @return
* @throws InstantiationException
* @throws IllegalAccessException
* @throws SQLException
*/
public String list(HttpServletRequest req,HttpServletResponse resp) {
PageBean pageBean=new PageBean();
pageBean.setRequest(req);
List<Book> list;
try {
list = this.bookDao.list(book, pageBean);
System.out.println(list);
req.setAttribute("booklist",list);
req.setAttribute("pageBean",pageBean);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return "list";
}
/**
* 跳转到增加或者修改页面
* @param req
* @param resp
* @return
* @throws InstantiationException
* @throws IllegalAccessException
* @throws SQLException
*/
public String preSave(HttpServletRequest req,HttpServletResponse resp){
//bid的类型是int类型，而int类型的默认值是0,如果jsp为传递bid的参数值，那么bid=0；
if(book.getBid()==0) {
System.out.println("增加逻辑...");
}else {
//修改数据回显逻辑 bid=1 book-->list.add(book)-->${book.bname}
Book b;
try {
b = this.bookDao.list(book, null).get(0);
req.setAttribute("book", b);
} catch (InstantiationException | IllegalAccessException | SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//新增页面与修改页面是同一个JSP
return "edit";
}
/**
* 新增
* @param req
* @param resp
* @return
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws SQLException
*/
public String add(HttpServletRequest req,HttpServletResponse resp) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
this.bookDao.add(book);
//新增完刷新页面
return "tolist";
}
/**
* 修改
* @param req
* @param resp
* @return
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws SQLException
*/
public String edit(HttpServletRequest req,HttpServletResponse resp) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
this.bookDao.edit(book);
return "tolist";
}
/**
* 删除
* @param req
* @param resp
* @return
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws SQLException
*/
public String del(HttpServletRequest req,HttpServletResponse resp) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, SQLException {
this.bookDao.del(book);
return "tolist";
}
@Override
public Book getModel() {
return book;
}
}
首页：BookList.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="/jt" %>
<!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}/book.action?methodName=list"
method="post">
书名：<input type="text" name="bname"> <input type="submit"
value="确定">
</form>
<a href="${pageContext.request.contextPath}/book.action?methodName=preSave">增加</a>
<table border="1" width="100%">
<tr>
<td>编号</td>
<td>名称</td>
<td>价格</td>
<td>操作</td>
</tr>
<c:forEach items="${booklist }" var="b">
<tr>
<td>${b.bid }</td>
<td>${b.bname }</td>
<td>${b.price }</td>
<td>
<a href="${pageContext.request.contextPath}/book.action?methodName=preSave&&bid=${b.bid}">修改</a>
<a href="${pageContext.request.contextPath}/book.action?methodName=del&&bid=${b.bid}">删除</a>
</td>
</tr>
</c:forEach>
</table>
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>
修改页面：bookEdit.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="${pageContext.request.contextPath}/book.action" method="post">
<input type="hidden" name="methodName" value="${book.bname == null?'add':'edit' }">
书籍ID:<input type="text" name="bid" value="${book.bid }"><br>
书籍名称:<input type="text" name="bname" value="${book.bname }"><br>
书籍价格:<input type="text" name="price" value="${book.price }"><br>
<input type="submit">
</form>
</body>
</html>
到这里就写完了！！！
