【JSP】--重定向，转发--186 drp

重定向

AddItemServlet代码：

/**
 * 
 */
package com.bjpowernode.drp.basedata.web;

import java.io.IOException;
import java.net.URLEncoder;
import java.sql.Connection;

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

import com.bjpowernode.drp.basedata.domain.Item;
import com.bjpowernode.drp.basedata.manager.ItemManager;
import com.bjpowernode.drp.basedata.manager.ItemManagerImpl;
import com.bjpowernode.drp.util.ApplicationException;
import com.bjpowernode.drp.util.PageModel;
import com.bjpowernode.drp.util.datadict.domain.ItemCategory;
import com.bjpowernode.drp.util.datadict.domain.ItemUnit;

/**
 * @ClassName:AddItemServlet
 * @Description:添加物料
 * @author wm
 * @date 2016年1月27日下午7:49:19
 */
public class AddItemServlet extends HttpServlet {


	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		//提交Servlet的时候防止乱码
		request.setCharacterEncoding("GB18030");
		//取得表单数据
		String itemNo=request.getParameter("itemNo");
		String itemName=request.getParameter("itemName");
		String spec=request.getParameter("spec");
		String pattern=request.getParameter("pattern");
		String category=request.getParameter("category");
		String unit=request.getParameter("unit");
		
		//构造Item对象
		Item item=new Item();
		item.setItemNO(itemNo);
		item.setItemName(itemName);
		item.setSpec(spec);
		item.setPattern(pattern);
		
		//构造物料类别
		ItemCategory itemCategory=new ItemCategory();
		itemCategory.setId(category);
		item.setItemCategory(itemCategory);
		
		//构造物料单位
		ItemUnit itemUnit=new ItemUnit();
		itemUnit.setId(unit);
		item.setItemUnit(itemUnit);
		
		ItemManager itemManager=new ItemManagerImpl();
		
		
		String errorMessage="";
		try{
		itemManager.addItem(item);
		}catch(ApplicationException e){
			//request.setAttribute("error_message", "添加物料失败，物料代码【"+itemNo+ "】");
			errorMessage ="添加物料失败，物料代码【"+ itemNo+"】";
		}
		
		//重定向到查询页面
		response.sendRedirect(request.getContextPath()+"/basedata/item_maint.jsp?errorMessage="+URLEncoder.encode(errorMessage,"GB18030"));
		//转发
		//request.getRequestDispatcher("/basedata/item_maint.jsp").forward(request, response);
	}
	
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

 html代码：

&nbsp;<font color="red"><%=request.getParameter("errorMessage")==null ? "":request.getParameter("errorMessage") %></font>

还需要修改tomcat配置，

右键tomcat服务--选中Browse deployment location

进入文件夹后，后退两层，选择conf

选择conf-server.xml

给端口8080的tomcat添加一条属性 URIEncoding="GB18030"

效果跟转发的效果是 一样的。

转发

AddItemServlet代码：

/**
 * 
 */
package com.bjpowernode.drp.basedata.web;

import java.io.IOException;
import java.sql.Connection;

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

import com.bjpowernode.drp.basedata.domain.Item;
import com.bjpowernode.drp.basedata.manager.ItemManager;
import com.bjpowernode.drp.basedata.manager.ItemManagerImpl;
import com.bjpowernode.drp.util.ApplicationException;
import com.bjpowernode.drp.util.PageModel;
import com.bjpowernode.drp.util.datadict.domain.ItemCategory;
import com.bjpowernode.drp.util.datadict.domain.ItemUnit;

/**
 * @ClassName:AddItemServlet
 * @Description:添加物料
 * @author wm
 * @date 2016年1月27日下午7:49:19
 */
public class AddItemServlet extends HttpServlet {


	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		//提交Servlet的时候防止乱码
		request.setCharacterEncoding("GB18030");
		//取得表单数据
		String itemNo=request.getParameter("itemNo");
		String itemName=request.getParameter("itemName");
		String spec=request.getParameter("spec");
		String pattern=request.getParameter("pattern");
		String category=request.getParameter("category");
		String unit=request.getParameter("unit");
		
		//构造Item对象
		Item item=new Item();
		item.setItemNO(itemNo);
		item.setItemName(itemName);
		item.setSpec(spec);
		item.setPattern(pattern);
		
		//构造物料类别
		ItemCategory itemCategory=new ItemCategory();
		itemCategory.setId(category);
		item.setItemCategory(itemCategory);
		
		//构造物料单位
		ItemUnit itemUnit=new ItemUnit();
		itemUnit.setId(unit);
		item.setItemUnit(itemUnit);
		
		ItemManager itemManager=new ItemManagerImpl();
		
		try{
		itemManager.addItem(item);
		}catch(ApplicationException e){
			request.setAttribute("error_message", "添加物料失败，物料代码【"+itemNo+ "】");
		}
		
		//重定向到查询页面
	//	response.sendRedirect(request.getContextPath()+"/basedata/item_maint.jsp");
		//转发
		request.getRequestDispatcher("/basedata/item_maint.jsp").forward(request, response);
	}
	
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}

HTML代码：

	<td nowrap height="10" class="p3">
		 <font color="red"><%=request.getAttribute("error_message") %></font>
	</td>

效果：