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