zoukankan      html  css  js  c++  java
  • Restful 风格

    大家在做Web开发的过程中,method常用的值是get和post. 可事实上,method值还可以是put和delete等等其他值。
    既然method值如此丰富,那么就可以考虑使用同一个url,但是约定不同的method来实施不同的业务,这就是Restful的基本考虑。
    CRUD是最常见的操作,在使用Restful 风格之前,通常的增加做法是这样的:

    /addCategory?name=xxx

    可是使用了Restful风格之后,增加就变成了:

    /categories

    CRUD如下表所示,URL就都使用一样的 "/categories",区别只是在于method不同,服务器根据method的不同来判断浏览器期望做的业务行为

      传统风格 Restful风格
      url method url method
    增加 /addCategory?name=xxx POST /categories POST
    删除 /deleteCategory?id=123 GET /categories/123 DELETE
    修改 /updateCategory?id=123&name=yyy POST /categories/123 PUT
    获取 /getCategory?id=123 GET /categories/123 GET
    查询 /listCategory GET /categories GET

    下面是jsp中的实例:

    listCategory.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
             pageEncoding="UTF-8"%>
    
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
    
    <script type="text/javascript" src="js/jquery.min.js"></script>
    
    <script type="text/javascript">
        /*将post method 改变为delete*/
        $(function(){
            $(".delete").click(function(){
                var href=$(this).attr("href");
                $("#formdelete").attr("action",href).submit();
                return false;
            })
        })
    </script>
    
    <div align="center">
    
    </div>
    
    <div style="500px;margin:20px auto;text-align: center">
        <table align='center' border='1' cellspacing='0'>
            <tr>
                <td>id</td>
                <td>name</td>
                <td>编辑</td>
                <td>删除</td>
            </tr>
            <c:forEach items="${page.content}" var="c" varStatus="st">
                <tr>
                    <td>${c.id}</td>
                    <td>${c.name}</td>
                    <td><a href="categories/${c.id}">编辑</a></td>
                    <td><a class="delete" href="categories/${c.id}">删除</a></td>
                </tr>
            </c:forEach>
    
        </table>
        <br>
        <div>
            <a href="?start=0">[首  页]</a>
            <a href="?start=${page.number-1}">[上一页]</a>
            <a href="?start=${page.number+1}">[下一页]</a>
            <a href="?start=${page.totalPages-1}">[末  页]</a>
        </div>
        <br>
        <form action="categories" method="post">
            name: <input name="name"> <br>
            <button type="submit">提交</button>
    
        </form>
    
        <form id="formdelete" action="" method="POST" >
            <input type="hidden" name="_method" value="DELETE">
        </form>
    </div>
    View Code

    editCategory.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8" isELIgnored="false"%>
     
    <div style="margin:0px auto; 500px">
     
    <form action="../categories/${c.id}" method="post">
            <input type="hidden" name="_method" value="PUT">
    name: <input name="name" value="${c.name}"> <br>
    <button type="submit">提交</button>
     
    </form>
    </div>
    View Code

    CategoryController中的写法:

    package com.how2java.springboot.web;
    
    import com.how2java.springboot.dao.CategoryDAO;
    import com.how2java.springboot.pojo.Category;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.PageRequest;
    import org.springframework.data.domain.Pageable;
    import org.springframework.data.domain.Sort;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.*;
    
    import java.util.List;
    
    @Controller
    public class CategoryController {
        @Autowired CategoryDAO categoryDAO;
    
        @GetMapping("/categories")
        public String listCategory(Model m, @RequestParam(value = "start", defaultValue = "0") int start, @RequestParam(value = "size", defaultValue = "5") int size) throws Exception {
            start = start<0?0:start;
            Sort sort = new Sort(Sort.Direction.DESC, "id");
            Pageable pageable = new PageRequest(start, size, sort);
            Page<Category> page =categoryDAO.findAll(pageable);
            m.addAttribute("page", page);
            return "listCategory";
        }
    
        @PostMapping("/categories")
        public String addCategory(Category c) throws Exception {
            categoryDAO.save(c);
            return "redirect:/categories";
        }
        @DeleteMapping("/categories/{id}")
        public String deleteCategory(Category c) throws Exception {
            categoryDAO.delete(c);
            return "redirect:/categories";
        }
        @PutMapping("/categories/{id}")
        public String updateCategory(Category c) throws Exception {
            categoryDAO.save(c);
            return "redirect:/categories";
        }
        @GetMapping("/categories/{id}")
        public String getCategory(@PathVariable("id") int id,Model m) throws Exception {
            Category c= categoryDAO.getOne(id);
            m.addAttribute("c", c);
            return "editCategory";
        }
    }
    View Code
  • 相关阅读:
    Python Redis 五大数据类型
    Python 魔法方法
    Python 静态方法,类方法,属性方法
    Python 反射
    Python 中 封装,继承,多态
    Redis 事务
    Redis 哨兵集群
    装饰器,迭代器,生成器
    Flume与kafka集成
    hbase 可视化工具 HBaseXplorer---HbaseGUI
  • 原文地址:https://www.cnblogs.com/afeng2010/p/10161316.html
Copyright © 2011-2022 走看看