基于javaweb的web资源库项目——后台资源管理demo

Posted 2021-10-23 stormzhuo

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前面完成了后台的用户管理，而资源管理的实现的原理和用户管理是差不多的，这里就直接给出资源管理的代码

文章目录

表的设计
表的创建
创建实体类
资源管理实现

表的设计

资源管理需要两个表，一个是管理用户资源的表resource,另一个是管理资源类别的表category

显然，管理用户资源的表需要两个外键，其中一个外键resource_uid对应用户账号user_id,另一个对应资源类别category_id

这样当删除用户时，用户所拥有的资源也会被删除，同理，当删除资源类别时，属于这种资源类别的用户资源也会被删除

管理用户资源表resource如下

字段名称	类型	约束	描述
resource_id	int(10)	NOT NULL AUTO_INCREMENT	资源编号
resource_cid	int(10)	NOT NULL FOREIGN KEY (`resource_cid`) REFERENCES `category` (`category_id`) ON DELETE CASCADE ON UPDATE CASCADE	外键对应资源类别编号category
resource_uid	varchar(20)	NOT NULL FOREIGN KEY (`resource_uid`) REFERENCES `user` (`user_id`) ON DELETE CASCADE ON UPDATE CASCADE	外键对应用户账号user_id
resource_name	varchar(20)	NOT NULL	资源名称
resource_image	varchar(500)	DEFAULT NULL	图片路径
resource_url	varchar(250)	NOT NULL	资源下载地址路径
resource_desc	varchar(250)	DEFAULT NULL	资源描述
resource_level	varchar(10)	NOT NULL DEFAULT ‘初级’	资源等级,默认为初级
resource_time	date	NOT NULL	资源上传时间
resource_good	int(10)	NOT NULL DEFAULT ‘0’	是否为优秀资源，默认为一般资源

资源类别表category如下

字段名称	类型	约束	描述
category_id	int(10)	NOT NULL AUTO_INCREMENT	资源类别编号
category_name	varchar(20)	NOT NULL	资源类别名称
category_desc	varchar(250)	DEFAULT NULL	资源类别描述

表的创建

resource表的创建

在mysql命令行使用如下sql语句创建resource表

USE web_resource;
DROP TABLE IF EXISTS `resource`;
CREATE TABLE `resource` (
  `resource_id` int(10) NOT NULL AUTO_INCREMENT,
  `resource_cid` int(10) NOT NULL,
  `resource_uid` varchar(20) NOT NULL,
  `resource_name` varchar(20) NOT NULL,
  `resource_image` varchar(500) DEFAULT NULL,
  `resource_url` varchar(250) NOT NULL,
  `resource_desc` varchar(250) DEFAULT NULL,
  `resource_level` varchar(10) NOT NULL DEFAULT '初级',
  `resource_time` date NOT NULL,
  `resource_good` int(10) NOT NULL DEFAULT '0',
  PRIMARY KEY (`resource_id`),
  KEY `resource_cid` (`resource_cid`),
  KEY `resource_uid` (`resource_uid`),
  CONSTRAINT `resource_ibfk_1` FOREIGN KEY (`resource_cid`) REFERENCES `category` (`category_id`) ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `resource_ibfk_2` FOREIGN KEY (`resource_uid`) REFERENCES `user` (`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;

category表的创建

在mysql命令行使用如下sql语句创建category表

USE web_resource;
DROP TABLE IF EXISTS `category`;
CREATE TABLE `category` (
  `category_id` int(10) NOT NULL AUTO_INCREMENT,
  `category_name` varchar(20) NOT NULL,
  `category_desc` varchar(250) DEFAULT NULL,
  PRIMARY KEY (`category_id`,`category_name`),
  KEY `category_id` (`category_id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;

创建实体类

在entity包下，创建用户资源实体resource,如下

package com.zhuo.entity;

public class Resource {
    private int resourceId;
    private int resourceCid;
    private String resourceUid;
    private String resourceName;
    private String resourceImage;
    private String resourceUrl;
    private String resourceDesc;
    private String resourceLevel;
    private String resourceTime;
    private int resourceGood;
	public Resource() {
		super();
	}
	public Resource(int resourceId, int resourceCid, String resourceUid, String resourceName, String resourceImage,
			String resourceUrl, String resourceDesc, String resourceLevel, String resourceTime, int resourceGood) {
		super();
		this.resourceId = resourceId;
		this.resourceCid = resourceCid;
		this.resourceUid = resourceUid;
		this.resourceName = resourceName;
		this.resourceImage = resourceImage;
		this.resourceUrl = resourceUrl;
		this.resourceDesc = resourceDesc;
		this.resourceLevel = resourceLevel;
		this.resourceTime = resourceTime;
		this.resourceGood = resourceGood;
	}
	public int getResourceId() {
		return resourceId;
	}
	public void setResourceId(int resourceId) {
		this.resourceId = resourceId;
	}
	public int getResourceCid() {
		return resourceCid;
	}
	public void setResourceCid(int resourceCid) {
		this.resourceCid = resourceCid;
	}
	public String getResourceUid() {
		return resourceUid;
	}
	public void setResourceUid(String resourceUid) {
		this.resourceUid = resourceUid;
	}
	public String getResourceName() {
		return resourceName;
	}
	public void setResourceName(String resourceName) {
		this.resourceName = resourceName;
	}
	public String getResourceImage() {
		return resourceImage;
	}
	public void setResourceImage(String resourceImage) {
		this.resourceImage = resourceImage;
	}
	public String getResourceUrl() {
		return resourceUrl;
	}
	public void setResourceUrl(String resourceUrl) {
		this.resourceUrl = resourceUrl;
	}
	public String getResourceDesc() {
		return resourceDesc;
	}
	public void setResourceDesc(String resourceDesc) {
		this.resourceDesc = resourceDesc;
	}
	public String getResourceLevel() {
		return resourceLevel;
	}
	public void setResourceLevel(String resourceLevel) {
		this.resourceLevel = resourceLevel;
	}
	public String getResourceTime() {
		return resourceTime;
	}
	public void setResourceTime(String resourceTime) {
		this.resourceTime = resourceTime;
	}
	public int getResourceGood() {
		return resourceGood;
	}
	public void setResourceGood(int resourceGood) {
		this.resourceGood = resourceGood;
	}
	@Override
	public String toString() {
		return "Resource [resourceId=" + resourceId + ", resourceCid=" + resourceCid + ", resourceUid=" + resourceUid
				+ ", resourceName=" + resourceName + ", resourceImage=" + resourceImage + ", resourceUrl=" + resourceUrl
				+ ", resourceDesc=" + resourceDesc + ", resourceLevel=" + resourceLevel + ", resourceTime="
				+ resourceTime + ", resourceGood=" + resourceGood + "]";
	}
}

在entity包下，创建资源类别实体category，如下

package com.zhuo.entity;

public class Category {
    private int categoryId;
    private String categoryName;
    private String categoryDesc;
	public Category() {
		super();
	}
	public Category(int categoryId, String categoryName, String categoryDesc) {
		super();
		this.categoryId = categoryId;
		this.categoryName = categoryName;
		this.categoryDesc = categoryDesc;
	}
	public int getCategoryId() {
		return categoryId;
	}
	public void setCategoryId(int categoryId) {
		this.categoryId = categoryId;
	}
	public String getCategoryName() {
		return categoryName;
	}
	public void setCategoryName(String categoryName) {
		this.categoryName = categoryName;
	}
	public String getCategoryDesc() {
		return categoryDesc;
	}
	public void setCategoryDesc(String categoryDesc) {
		this.categoryDesc = categoryDesc;
	}
	@Override
	public String toString() {
		return "Category [categoryId=" + categoryId + ", categoryName=" + categoryName + ", categoryDesc="
				+ categoryDesc + "]";
	}
}

资源管理实现

获取所有用户资源信息并分页

后端实现

在controller层中创建resource包，并在resource包下创建DoResourceSelect.java，代码如下

package com.zhuo.controller.resource;

import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.zhuo.entity.Category;
import com.zhuo.entity.Resource;
import com.zhuo.entity.User;
import com.zhuo.service.impl.ResourceServiceImpl;

@WebServlet("/manage/admin_do_resource_select")
public class DoResourceSelect extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 当前页
		int currentPage = 1;
		// 每页显示条数
		int count = 5;
		// array[0]=资源总数，array[1]=总页数，后面会被覆盖
		int array[] = { 0, 0 };
		// 获取用户指定的页面
		String cp = request.getParameter("currentPage");
		System.out.println("cp = " + cp);
		// 接收用户搜索的关键字
		String keyword = request.getParameter("keywords");
		/* 用户如果有指定当前页，则把字符串转化为int型 */
		if (cp != null) {
			currentPage = Integer.parseInt(cp);
		}
		// 创建资源service层接口的实现类
		ResourceServiceImpl resourceServiceImpl = new ResourceServiceImpl();
		/*
		 * 调用业务逻辑方法获取资源记录总数并算出总页数 即(array[0]=资源总数，array[1]=总页数(资源总数/每页显示条数)
		 */
		try {
			array = resourceServiceImpl.getResourcePageTotal(count, keyword);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		// 调用业务逻辑方法获取所有资源信息
		ArrayList<Resource> listResource = null;
		try {
			listResource = resourceServiceImpl.getAllResourceInfo(currentPage, count, keyword);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		// 调用业务逻辑方法获取所有含有资源的用户信息
		ArrayList<User> listUser = null;
		try {
			listUser = resourceServiceImpl.getAllHasResourceUser(listResource);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		/* 遍历所有资源，遍历过程中利用资源id
		 * 调用业务逻辑方法获取资源类别信息，并添加到list集合中 */
		ArrayList<Category> listCategory = new ArrayList<Category>();
		for (int i = 0; i < listResource.size(); i++) {
			Category category = new Category();
			try {
				category = resourceServiceImpl.getAllResourceCategoryInfo(listResource.get(i).getResourceCid());
			} catch (SQLException e) {
				e.printStackTrace();
			}
			listCategory.add(category);
		}
		// 放到请求对象域里
		request.setAttribute("resourceList", listResource);
		request.setAttribute("userList", listUser);
		request.setAttribute("categoryList", listCategory);
		request.setAttribute("totalStudent", array[0]);
		request.setAttribute("totalPage", array[1]);
		request.setAttribute("currentPage", currentPage);
		request.getRequestDispatcher("/views/after/manage/admin_resource.jsp").forward(request, response);
	}
}

在service层中创建ResourceService接口，并在接口中添加如下业务逻辑抽象方法，如下

	// 获取所有资源记录总数及页数
	public int[] getResourcePageTotal(int count, String keyword) throws SQLException;
	
	// 获取所有资源信息
	public ArrayList<Resource> getAllResourceInfo(int currentPage, int count, String keyword) throws SQLException;
	
	// 获取所有含有资源的用户信息
	public ArrayList<User> getAllHasResourceUser(ArrayList<Resource> listResource) throws SQLException;
	
	// 获取所有资源的类别信息
	public Category getAllResourceCategoryInfo(int categoryId) throws SQLException;

在service层中创建接口的实现类ResourceServiceImpl.java，并在实现类中重写接口方法，如下

	// 创建资源dao层接口的实现类
	ResourceDao resourceDao = new ResourceDaoImpl();
	@Override
	public int[] getResourcePageTotal(int count, String keyword) throws SQLException {
		// 检索所有资源总数并算出总页数
		int[] array = resourceDao.selectResourceTotal(count, keyword);
		return array;
	}
	
	@Override
	public ArrayList<Resource> getAllResourceInfo(int currentPage, int count, String keyword) throws SQLException {
		// 检索所有资源信息
		ArrayList<Resource> listResource = resourceDao.selectAllResource(currentPage, count, keyword);
		return listResource;
		
	}
	
	@Override
	public ArrayList<User> getAllHasResourceUser(ArrayList<Resource> listResource) throws SQLException {
		// 检索含有资源的所有用户信息
		ArrayList<User> listUser = resourceDao.基于javaweb的web资源库项目——后台资源管理demo
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