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关于后端:SSM系列教材-九-restful-风格的SSM项目

作者：

jiezi

在

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

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