关于后端:SSM系列教材-九-restful-风格的SSM项目

步骤1:Restful 格调是什么
步骤2:先运行，看到成果，再学习
步骤3:web.xml
步骤4:listCategory.jsp
步骤5:editCategory.jsp
步骤6:CategoryController

步骤 1 : Restful 格调是什么

步骤 2 : 先运行，看到成果，再学习

下载区(点击进入)筹备了一个能够运行的restful格调的crud，配置运行起来，确认可用之后，再学习做了哪些步骤以达到这样的成果。
启动后，测试地址是：

http://127.0.0.1:8080/ssm/categories

注：这个restful格调的curd，是在传统格调的crud的根底上批改了，所以最好先相熟之后，再学习该知识点。

步骤 3 : web.xml

SpringMVC 只能解决post和get,为了还原对put和delete的解决，web.xml外面要加如下过滤器

<filter>    <filter-name>HiddenHttpMethodFilter</filter-name>    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class></filter><filter-mapping>    <filter-name>HiddenHttpMethodFilter</filter-name>    <url-pattern>/*</url-pattern></filter-mapping><?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xmlns="http://java.sun.com/xml/ns/javaee"         xmlns:web="http://java.sun.com/xml/ns/javaee"         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">    <!-- spring的配置文件-->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:applicationContext.xml</param-value>    </context-param>    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <filter>        <filter-name>HiddenHttpMethodFilter</filter-name>        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>    </filter>    <filter-mapping>        <filter-name>HiddenHttpMethodFilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <filter>        <filter-name>CharacterEncodingFilter</filter-name>        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>        <init-param>            <param-name>encoding</param-name>            <param-value>utf-8</param-value>        </init-param>    </filter>    <filter-mapping>        <filter-name>CharacterEncodingFilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <!-- spring mvc外围：散发servlet -->    <servlet>        <servlet-name>mvc-dispatcher</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <!-- spring mvc的配置文件 -->        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath:springMVC.xml</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>mvc-dispatcher</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping></web-app>

步骤 4 : listCategory.jsp

listCategory.jsp 做了如下批改
1. 减少
action批改为"categories"
2. 删除
2.1 url批改为categories/id
2.2 点击超链后，会应用form提交，并且提交_method的值为delete, 这样在 springmvc失去后，就会以 method=delete 解决了。

$(function(){                         $(".delete").click(function(){         var href=$(this).attr("href");         $("#formdelete").attr("action",href).submit();         return false;     }) })

3. 获取
3.1 url批改为了/categories/id

4. 在最开始减少了jquery.min.js的引入

<script type="text/javascript" src="js/jquery.min.js"></script>`<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" import="java.util.*"%><%@ 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 扭转为delete*/    $(function(){        $(".delete").click(function(){            var href=$(this).attr("href");            $("#formdelete").attr("action",href).submit();            return false;        })    })</script><div style="width:500px;margin:0px auto;text-align:center">    <table align='center' border='1' cellspacing='0'>        <tr>            <td>id</td>            <td>name</td>            <td>编辑</td>            <td>删除</td>        </tr>        <c:forEach items="${cs}" 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>    <div style="text-align:center">        <a href="?start=0">首  页</a>        <a href="?start=${page.start-page.count}">上一页</a>        <a href="?start=${page.start+page.count}">下一页</a>        <a href="?start=${page.last}">末  页</a>    </div>    <div style="text-align:center;margin-top:40px">        <form method="POST" action="categories">            分类名称： <input name="name" value="" type="text"> <br><br>            <input type="submit" value="减少分类">        </form>    </div></div><form id="formdelete" action="" method="POST" >    <input type="hidden" name="_method" value="DELETE"></form>

步骤 5 : editCategory.jsp

action批改为了 categories/id
留神：form 下减少 filed, 尽管这个form的method是post, 然而springmvc看到这个_method的值是put后，会把其批改为put.

<input type="hidden" name="_method" value="PUT"><%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8" import="java.util.*"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><div style="width:500px;margin:0px auto;text-align:center">    <div style="text-align:center;margin-top:40px">        <form method="post" action="../categories/${c.id}">            <input type="hidden" name="_method" value="PUT">            分类名称： <input name="name" value="${c.name}" type="text"> <br><br>            <input type="submit" value="批改分类">        </form>    </div></div>

步骤 6 : CategoryController

CRUD的RequestMapping都批改为了/categories,只是method各不相同。
其余的。。。没变动

package com.how2java.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import com.how2java.pojo.Category;import com.how2java.service.CategoryService;import com.how2java.util.Page;// 通知spring mvc这是一个控制器类@Controller@RequestMapping("")public class CategoryController {    @Autowired    CategoryService categoryService;    @RequestMapping(value="/categories",method=RequestMethod.GET)    public ModelAndView listCategory(Page page){        ModelAndView mav = new ModelAndView();        List<Category> cs= categoryService.list(page);        int total = categoryService.total();        page.caculateLast(total);        // 放入转发参数        mav.addObject("cs", cs);        // 放入jsp门路        mav.setViewName("listCategory");        return mav;    }    @RequestMapping(value="/categories",method=RequestMethod.POST)    public ModelAndView addCategory(Category category){        System.out.println("category.getName():"+category.getName());        categoryService.add(category);        ModelAndView mav = new ModelAndView("redirect:/categories");        return mav;    }    @RequestMapping(value="/categories/{id}",method=RequestMethod.DELETE)    public ModelAndView deleteCategory(Category category){        categoryService.delete(category);        ModelAndView mav = new ModelAndView("redirect:/categories");        return mav;    }    @RequestMapping(value="/categories/{id}",method=RequestMethod.GET)    public ModelAndView editCategory(Category category){        Category c= categoryService.get(category.getId());        ModelAndView mav = new ModelAndView("editCategory");        mav.addObject("c", c);        return mav;    }    @RequestMapping(value="/categories/{id}",method=RequestMethod.PUT)    public ModelAndView updateCategory(Category category){        categoryService.update(category);        ModelAndView mav = new ModelAndView("redirect:/categories");        return mav;    }}

更多内容，点击理解： https://how2j.cn/k/ssm/ssm-restful/1638.html