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自定义mvc项目03

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思维导图

自定义mvc项目03

 将书籍类别死数据变活

自定义mvc项目03

 

两种方案：

1、数据遍历，发送ajax请求

注意点：
  1.同步异步问题
  2.json字符串转json对象问题
  3.性能非常差

①修改CategroyDao

package com.lsy.dao;

import java.util.List;

import com.lsy.entity.Category;
import com.zking.util.BaseDao;
import com.zking.util.PageBean;

public class CategoryDao extends BaseDao<Category>{
    
    public List<Category> list(Category category, PageBean pageBean) throws Exception {
        String sql=”select * from t_easyui_category where 1=1″;
        long id = category.getId();
        if(id!=0) {
            sql+=” and id=”+id;
        }
        return super.executeQuery(sql, Category.class, pageBean);
    }
}    
 

②在CategoryAction增加load

public String load(HttpServletRequest req, HttpServletResponse resp) {
        try {
            //传递id到后台，只会查出一个类别
             Category c = categoryDao.list(category, null).get(0);
            ResponseUtil.writeJson(resp, c);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

listBook1.jsp页面（以下是死数据，我们要将它变活）

/*   if (row.cid == 1) {
                            return "文艺";
                        } else if (row.cid == 2) {
                            return "小说";
                        } else if (row.cid == 3) {
                            return "青春";
                        } else {
                            return value;
                        } */

改为（调用action中的load方法，进行转变）

var cid=row.cid;
                        var typeName="";
                        $.ajax({
                        	url:'${pageContext.request.contextPath}/category.action?methodName=load&&id='+cid,
                        	async:false,
                        		success:function(data){
                        		var jsonObj=eval("("+data+")");
                        		typeName=jsonObj.name;
                        	}
                        });

2、Vo类性能优化

①增加实体类，书写dao包以及web包

Vo实体类

注意：BookVo实体类继承了Book，但是只是继承了Book中的方法，并没有继承到属性，所以要把Book的属性也添加进去

package com.lsy.vo;

import java.util.Date;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.lsy.entity.Book;

/**
 * vo: view  object视图模型对象
 * 用在哪里：在同一个页面显示多张表的数据
 * @author zjjt
 *
 */
public class BookVo extends Book{
	private String cname;
	private long id;
	private String name;
	private String pinyin;
	private long cid;
	private String author;
	private float price;
	private String image;
	private String publishing;
	private String description;
	private int state;
	@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
	private Date deployTime;
	private int sales;

	public long getId() {
		return id;
	}

	public void setId(long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPinyin() {
		return pinyin;
	}

	public void setPinyin(String pinyin) {
		this.pinyin = pinyin;
	}

	public long getCid() {
		return cid;
	}

	public void setCid(long cid) {
		this.cid = cid;
	}

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public float getPrice() {
		return price;
	}

	public void setPrice(float price) {
		this.price = price;
	}

	public String getImage() {
		return image;
	}

	public void setImage(String image) {
		this.image = image;
	}

	public String getPublishing() {
		return publishing;
	}

	public void setPublishing(String publishing) {
		this.publishing = publishing;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public int getState() {
		return state;
	}

	public void setState(int state) {
		this.state = state;
	}

	public Date getDeployTime() {
		return deployTime;
	}

	public void setDeployTime(Date deployTime) {
		this.deployTime = deployTime;
	}

	public int getSales() {
		return sales;
	}

	public void setSales(int sales) {
		this.sales = sales;
	}

	public String getCname() {
		return cname;
	}

	public void setCname(String cname) {
		this.cname = cname;
	}

	
	
	
}

BookVoDao（sql语句中进行了连表查询）

package com.lsy.dao;

import java.util.List;

import com.lsy.entity.Book;
import com.lsy.vo.BookVo;
import com.zking.util.BaseDao;
import com.zking.util.PageBean;
import com.zking.util.StringUtils;

public class BookVoDao extends BaseDao<BookVo>{
	public List<BookVo> list(BookVo bookVo, PageBean pageBean) throws Exception {
		String sql="select b.*,c.name as cname from t_easyui_book b,t_easyui_category c where b.cid=c.id";
		String name=bookVo.getName();
		int state=bookVo.getState();
		if(StringUtils.isNotBlank(name)) {
			sql+= " and name like'%"+name+"%'";
		}
		if(state!=0) {
			sql+=" and state="+state;
		}
		return super.executeQuery(sql, BookVo.class, pageBean);
	}
}

BookVoAction：

package com.lsy.web;

import java.io.File;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.lsy.dao.BookDao;
import com.lsy.entity.Book;
import com.zking.framework.ActionSupport;
import com.zking.framework.ModelDriver;
import com.zking.util.DateUtil;
import com.zking.util.PageBean;
import com.zking.util.PropertiesUtil;
import com.zking.util.R;
import com.zking.util.ResponseUtil;

public class BookAction extends ActionSupport implements ModelDriver<Book> {
	private Book book = new Book();
	private BookDao bookDao = new BookDao();

	@Override
	public Book getModel() {
		return book;
	}

	public void list(HttpServletRequest req, HttpServletResponse resp) {
		PageBean pageBean = new PageBean();
		pageBean.setRequest(req);
		try {
			List<Book> list = bookDao.list(book, pageBean);
			ResponseUtil.writeJson(resp, new R().data("total", pageBean.getTotal()).data("rows", list));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

配置xml文件

<action path=”/bookVo” type=”com.lsy.web.BookVoAction”>
    </action>

listBook1.jsp界面

$('#dg').datagrid({
            url: '${pageContext.request.contextPath}/bookVo.action?methodName=list&&state=1',
            fit: true,
            fitColumns: true,
            pagination: true,
            singleSelect: true,
            toolbar:'#tb',
            columns: [[
                // {field:'id',title:'id',width:100},
                {field: 'id', title: '书籍名称', hidden: true},
                {field: 'name', title: '书籍名称', width: 50},
                {field: 'pinyin', title: '拼音', width: 50},
                {field: 'cname', title: '连表类别', width: 50},
                {

界面展示

自定义mvc项目03

一、门户首页类别

①直接调用CategoryDao的list方法；

②调用CategoryAction的combobox方法；

③index.jsp增加<input>输入框，并隐藏

<input type=”hidden” id=”ctx” value=”${pageContext.request.contextPath}”>

index.js界面

$(function(){
	$.ajax({
		url:$("#ctx").val()+"/category.action?methodName=combobox",
		success:function(data){
			var jsonArr=eval("("+data+")");
	    	var html='';
	    	for(var i in jsonArr){
	    		html+='<li class="list-group-item" onclick="searchByType('+jsonArr[i].id+')">'+jsonArr[i].name+'</li>';
	    	}
	    	$(".list-group").append(html);
		} 
	})
})

结果展示

自定义mvc项目03

 二、类别分类查询

1.在index.js文件中增加点击事件onclick

html+='<li class=”list-group-item” οnclick=”searchByType(‘+jsonArr[i].id+’)”>’+jsonArr[i].name+'</li>’;

2.index.jsp页面中的searchType方法

function searchByType(cid){
        
    	location.href='${pageContext.request.contextPath}/book.action?methodName=findByType&cid='+cid;
    };

3.BookAction增加findByType方法，BookDao修改list方法

①BookAction

/**
	 * 按照书籍的类别查询出对应的书籍信息
	 * 前端：
	 * 从首页index.jsp传递书籍类别id到后台来查询
	 * 不是发送ajax请求
	 * 后端：
	 * 通过类别id查询到对应书籍集合，到前台遍历
	 * 后台是有返回值
	 * @param req
	 * @param resp
	 * @return
	 */
	public String findByType(HttpServletRequest req, HttpServletResponse resp) {
		try {
			PageBean pageBean=new PageBean();
			pageBean.setRequest(req);
			List<Book> list = bookDao.list(book,pageBean);
			req.setAttribute("books", list);
			req.setAttribute("pagebean", pageBean);
		} catch (Exception e) {
			e.printStackTrace();
		}

		return "findBook";
	}

②BookDao

public List<Book> list(Book book, PageBean pageBean) throws Exception {
		String sql="select * from t_easyui_book where 1=1";
		String name=book.getName();
		int state=book.getState();
		long cid = book.getCid();
		if(StringUtils.isNotBlank(name)) {
			sql+= " and name like'%"+name+"%'";
		}
		if(state!=0) {
			sql+=" and state="+state;
		}
		if(cid!=0) {
			sql+=" and cid="+cid;
		}
		return super.executeQuery(sql, Book.class, pageBean);
	}

结果展示

自定义mvc项目03

三.图片上传 

一.导入相关jar包

自定义mvc项目03

 1、listBook1.jsp图片表单提交方法

/图片上传表单提交
    function submitForm2() {
        var row = $('#dg').datagrid('getSelected');
        console.log(row);
        // if (row) {
        //     $('#ff2').attr("action", $('#ff2').attr("action") + "&id=" + row.id);
        // }
        $('#ff2').form('submit', {
            url: '${pageContext.request.contextPath}/book.action?methodName=upload&id=' + row.id,
            success: function (param) {
                $('#dd2').dialog('close');
                $('#dg').datagrid('reload');
                $('#ff2').form('clear');
            }
        })
    }

2、增加 resource.properties文件、DateUtil类、PropertiesUtil类

resource.properties文件

diskDir=F:/temp1/
serverDir=/uploadImages/

DateUtil类（转换格式）

package com.zking.util;

import java.text.SimpleDateFormat;
import java.util.Date;

public class DateUtil {

	public static String getCurrentDateStr() {
		//20210927xxx  
		SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmss");
		return sdf.format(new Date());
	}
	
}

PropertiesUtil类（读取properties文件，注意不要写错了）

package com.zking.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class PropertiesUtil {

	public static String getValue(String key) throws Exception{
		Properties p=new Properties();
		InputStream in = PropertiesUtil.class.getResourceAsStream("/resource.properties");
		p.load(in);
		return p.getProperty(key);
	}
}

三.dao  以及  action

BookDao(editImgUrl方法)

public void editImgUrl(Book t) throws Exception {
		super.executeUpdate("update t_easyui_book set image=? where id=?", 
				t, new String[] {"image","id"});
	}

BookAction

public String upload(HttpServletRequest req, HttpServletResponse resp) {
		try {
            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            List<FileItem> items = upload.parseRequest(req);
            Iterator<FileItem> itr = items.iterator();

            HttpSession session = req.getSession();

            while (itr.hasNext()) {
                FileItem item = (FileItem) itr.next();
                if (item.isFormField()) {
                    System.out.println("普通字段处理");
                    book.setId(Long.valueOf(req.getParameter("id")));
                } else if (!"".equals(item.getName())) {
                	//年/月/日
                    String imageName = DateUtil.getCurrentDateStr();
                    // 存入数据的的数据，以及浏览器访问图片的映射地址
                    String serverDir = PropertiesUtil.getValue("serverDir");
                    // 图片真实的存放位置
                    String diskDir = PropertiesUtil.getValue("diskDir");
                    // 图片的后缀名
                    String subfix = item.getName().split("\\.")[1];

                    book.setImage(serverDir + imageName + "." + subfix);
                    item.write(new File(diskDir + imageName + "." + subfix));
                    this.bookDao.editImgUrl(book);
                    ResponseUtil.writeJson(resp, 1);
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

配置xml文件

注意：这次是在servers文件夹中的server.xml文件中配置

其中docBase要与你自己填的路径一致

 <Context path=”/uploadImages” docBase=”F:/temp1/”/>    

结果展示

自定义mvc项目03

结束~ 

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