修改的2种方式

hi, / 2023-08-21 / 原文

方式一：html -> servlet ->jsp->servlet->html

html:

<a :href="'http://localhost:8080/Servlet-Vue-ElementUI/BrandController?method=selectId&id='+brand.id">修改</a>

servlet

public void selectId(HttpServletRequest request, HttpServletResponse response) throws Exception {

HttpSession session=request.getSession();

//1.接收id的值

String id=request.getParameter("id");

//2.调用srvice层的查询方法（根据id查询）

Brand brand= brandService.selectById(Integer.parseInt(id));

//3.判断brand是否为null

if(brand!=null){

//4.存到session作用域里

session.setAttribute("brand", brand);

//5.转发到修改页面上（updateBrand.jsp）

request.getRequestDispatcher("/updateBrand.jsp").forward(request, response);

}else{

//还在主界面

}

}

jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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>
<h3>修改</h3>
<form action="/Servlet-Vue-ElementUI/BrandController?method=updateBrand" method="post">
<input type="hidden" name="id" value="${brand.id }"/>
品牌名称：<input type="text" name="brandName" value="${brand.brandName}"/> <br />
企业名称：<input type="text" name="companyName" value="${brand.companyName}"/> <br />
排序：<input type="text" name="ordered" value="${brand.ordered}"/> <br />
表述信息：<input type="text" name="description" value="${brand.description}"/> <br />
状态：
<c:if test="${brand.status==0 }">
<input type="radio" name="status" value="0" checked/> 禁用
<input type="radio" name="status" value="1"/> 启用<br>
</c:if>
<c:if test="${brand.status==1 }">
<input type="radio" name="status" value="0" /> 禁用
<input type="radio" name="status" value="1" checked/> 启用<br>
</c:if>
<input type="submit" value="修改"/>
<input type="reset" />
</form>
</body>
</html>

servlet

public void updateBrand(HttpServletRequest request, HttpServletResponse response) throws Exception {

//1.接收前端页面发送来的数据，并封装在Brand对象中

Brand b=new Brand();

Map<String,String[]> map=request.getParameterMap();

BeanUtils.populate(b, map);

//2.调用修改方法

int i=brandService.updateBrand(b);

//3.判断i>0

if(i>0){

//修改成功

response.sendRedirect(request.getContextPath()+"/brand.html");

}else{

//修改失败

response.sendRedirect(request.getContextPath()+"/updateBrand.jsp");

}

}