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后台页面中添加分类

首先，找到后台左侧导航页面——left.jsp，在添加分类的超链接上绑定显示添加分类的页面。

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
       
    
   
    	
    
	    	     
      
	    		       
分类名称：
	    		       
	    	      
      
	    	      
      
	    		       
分类描述：
	    		       
	    	      
	    	      
	    		       
       
	    	      
    	     
    
    
   
  

紧接着，在cn.liayun.web.manager包中创建一个CategoryServlet，用于处理添加分类的请求。

package cn.liayun.web.manager;import java.io.IOException;import java.util.UUID;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 cn.liayun.domain.Category;import cn.liayun.service.BusinessService;import cn.liayun.service.impl.BusinessServiceImpl;import cn.liayun.utils.WebUtils;@WebServlet("/manager/CategoryServlet")public class CategoryServlet extends HttpServlet {
   		private BusinessService service = new BusinessServiceImpl();		protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		String method = request.getParameter("method");		if ("add".equals(method)) {
   			add(request, response);		}	}		private void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		try {
   			Category c = WebUtils.request2Bean(request, Category.class);			c.setId(UUID.randomUUID().toString());			service.addCategory(c);						request.setAttribute("message", "添加成功！！");		} catch (Exception e) {
   			e.printStackTrace();			request.setAttribute("message", "添加失败！！");		}		request.getRequestDispatcher("/message.jsp").forward(request, response);	}	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		// TODO Auto-generated method stub		doGet(request, response);	}}

由于添加完分类之后，不管是成功还是失败，都要跳转到一个全局消息显示页面。所以，还得在WebRoot根目录下新建一个message.jsp页面。

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
   ${message }

测试效果如下：

后台页面中查看分类

找到后台左侧导航页面——left.jsp，在查看分类的超链接上绑定处理请求的CategoryServlet。

package cn.liayun.web.manager;import java.io.IOException;import java.util.List;import java.util.UUID;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 cn.liayun.domain.Category;import cn.liayun.service.BusinessService;import cn.liayun.service.impl.BusinessServiceImpl;import cn.liayun.utils.WebUtils;@WebServlet("/manager/CategoryServlet")public class CategoryServlet extends HttpServlet {
   		private BusinessService service = new BusinessServiceImpl();		protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		String method = request.getParameter("method");		if ("add".equals(method)) {
   			add(request, response);		}		if ("getAll".equals(method)) {
   			getAll(request, response);		}	}	private void getAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		List
   
     list = service.getAllCategory();		request.setAttribute("categories", list);		request.getRequestDispatcher("/manager/listcategory.jsp").forward(request, response);	}	private void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		try {
   			Category c = WebUtils.request2Bean(request, Category.class);			c.setId(UUID.randomUUID().toString());			service.addCategory(c);						request.setAttribute("message", "添加成功！！");		} catch (Exception e) {
   			e.printStackTrace();			request.setAttribute("message", "添加失败！！");		}		request.getRequestDispatcher("/message.jsp").forward(request, response);	}	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		// TODO Auto-generated method stub		doGet(request, response);	}}
   

最后，在manager目录中创建出显示分类的listcategory.jsp页面。

<%@ page language="java" contentType="text/html; charset=UTF-8"	pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
   	
	
	
   			
   
   
		    
			
     
书籍分类信息
		
    
		    
     
			      
分类名称
			      
分类描述
			      
操作
		     
		     
				      
${category.name }
				      
${category.description }
				      
修改 删除
			     
			    
   

测试效果如下：

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