需求一:图片列表查询,从后台返回数据,将数据展示在页面上
需求二:新增图片,将新增图书的数据传递到后台,并在控制台打印
说明:此次案例的重点是在SpringMVC中如何使用RESTful实现前后台交互,所以本案例并没有和数据库进行交互,所有数据使用假
数据来完成开发。
我们的基本步骤:
搭建项目导入jar包
编写Controller类,提供两个方法,一个用来做列表查询,一个用来做新增
在方法上使用RESTful进行路径设置
完成请求、参数的接收和结果的响应
使用PostMan进行测试
将前端页面拷贝到项目中
页面发送ajax请求
完成页面数据的展示
创建一个Web的Maven项目
pom.xml添加Spring依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<groupId>com.nefugroupId>
<artifactId>springmvc_tryartifactId>
<version>1.0-SNAPSHOTversion>
<packaging>warpackaging>
<dependencies>
<dependency>
<groupId>javax.servletgroupId>
<artifactId>javax.servlet-apiartifactId>
<version>3.1.0version>
<scope>providedscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webmvcartifactId>
<version>5.2.10.RELEASEversion>
dependency>
<dependency>
<groupId>com.fasterxml.jackson.coregroupId>
<artifactId>jackson-databindartifactId>
<version>2.9.0version>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.mavengroupId>
<artifactId>tomcat7-maven-pluginartifactId>
<version>2.1version>
<configuration>
<port>80port>
<path>/path>
configuration>
plugin>
plugins>
build>
project>
创建对应的配置类
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
protected Class<?>[] getRootConfigClasses() {
return new Class[0];
}
protected Class<?>[] getServletConfigClasses() {
return new Class[]{SpringMvcConfig.class};
}
protected String[] getServletMappings() {
return new String[]{"/"};
}
//乱码处理
@Override
protected Filter[] getServletFilters() {
CharacterEncodingFilter filter = new CharacterEncodingFilter();
filter.setEncoding("UTF-8");
return new Filter[]{filter};
}
}
@Configuration
@ComponentScan("com.nefu.controller")
//开启json数据类型自动转换
@EnableWebMvc
public class SpringMvcConfig {
}
编写模型类Book
public class Book {
private Integer id;
private String type;
private String name;
private String description;
//setter...getter...toString略
}
编写BookController
@Controller
public class BookController {
}
项目结构:
@RestController
@RequestMapping("/books")
public class BookController {
@PostMapping
public String save(@RequestBody Book book){
System.out.println("book save ==> "+ book);
return "{'module':'book save success'}";
}
@GetMapping
public List<Book> getAll(){
System.out.println("book getAll is running ...");
List<Book> bookList = new ArrayList<Book>();
Book book1 = new Book();
book1.setType("计算机");
book1.setName("SpringMVC入门教程");
book1.setDescription("小试牛刀");
bookList.add(book1);
Book book2 = new Book();
book2.setType("计算机");
book2.setName("SpringMVC实战教程");
book2.setDescription("一代宗师");
bookList.add(book2);
Book book3 = new Book();
book3.setType("计算机丛书");
book3.setName("SpringMVC实战教程进阶");
book3.setDescription("一代宗师呕心创作");
bookList.add(book3);
return bookList;
}
}
测试新增
{
"type":"计算机丛书",
"name":"SpringMVC终极开发",
"description":"这是一本好书"
}
测试查询
将资料\功能页面
下的所有内容拷贝到项目的webapp
目录下
打开浏览器输入http://localhost/pages/books.html
(1)出现错误的原因?
SpringMVC拦截了静态资源,根据/pages/books.html去controller找对应的方法,找不到所以会报404的错误。
(2)SpringMVC为什么会拦截静态资源呢?
(3)解决方案?
@Configuration
public class SpringMvcSupport extends WebMvcConfigurationSupport {
//设置静态资源访问过滤,当前类需要设置为配置类,并被扫描加载
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
//当访问/pages/????时候,从/pages目录下查找内容
registry.addResourceHandler("/pages/**").addResourceLocations("/pages/");
registry.addResourceHandler("/js/**").addResourceLocations("/js/");
registry.addResourceHandler("/css/**").addResourceLocations("/css/");
registry.addResourceHandler("/plugins/**").addResourceLocations("/plugins/");
}
}
@Configuration
@ComponentScan({"com.nefu.controller","com.nefu.config"})
@EnableWebMvc
public class SpringMvcConfig {
}
或者
@Configuration
@ComponentScan("com.nefu")
@EnableWebMvc
public class SpringMvcConfig {
}
注意:
此处有人可能会想着把SpringMvcSupport配置类上的@Configuration注解给去掉,然后在SpringMvcConfig文件中使用@Import进行引入这样是不行的!因为这样的话实际上是让SpringMvcConfig引入SpringMvcSupport配置类中所有的bean,但是你SpringMvcSupport配置类中就重写了一个方法,压根就没有bean。所以不能使用。
例如像下面这种才可以使用:@Configuration public class ImportedConfig { @Bean public ImportedBean getImportedBean(){ return new ImportedBean(); } }
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具体的@Import注解使用规则,可以参考下面的链接:
@Import注解详解
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>SpringMVC案例title>
<link rel="stylesheet" href="../plugins/elementui/index.css">
<link rel="stylesheet" href="../plugins/font-awesome/css/font-awesome.min.css">
<link rel="stylesheet" href="../css/style.css">
head>
<body class="hold-transition">
<div id="app">
<div class="content-header">
<h1>图书管理h1>
div>
<div class="app-container">
<div class="box">
<div class="filter-container">
<el-input placeholder="图书名称" style="width: 200px;" class="filter-item">el-input>
<el-button class="dalfBut">查询el-button>
<el-button type="primary" class="butT" @click="openSave()">新建el-button>
div>
<el-table size="small" current-row-key="id" :data="dataList" stripe highlight-current-row>
<el-table-column type="index" align="center" label="序号">el-table-column>
<el-table-column prop="type" label="图书类别" align="center">el-table-column>
<el-table-column prop="name" label="图书名称" align="center">el-table-column>
<el-table-column prop="description" label="描述" align="center">el-table-column>
<el-table-column label="操作" align="center">
<template slot-scope="scope">
<el-button type="primary" size="mini">编辑el-button>
<el-button size="mini" type="danger">删除el-button>
template>
el-table-column>
el-table>
<div class="pagination-container">
<el-pagination
class="pagiantion"
@current-change="handleCurrentChange"
:current-page="pagination.currentPage"
:page-size="pagination.pageSize"
layout="total, prev, pager, next, jumper"
:total="pagination.total">
el-pagination>
div>
<div class="add-form">
<el-dialog title="新增图书" :visible.sync="dialogFormVisible">
<el-form ref="dataAddForm" :model="formData" :rules="rules" label-position="right" label-width="100px">
<el-row>
<el-col :span="12">
<el-form-item label="图书类别" prop="type">
<el-input v-model="formData.type"/>
el-form-item>
el-col>
<el-col :span="12">
<el-form-item label="图书名称" prop="name">
<el-input v-model="formData.name"/>
el-form-item>
el-col>
el-row>
<el-row>
<el-col :span="24">
<el-form-item label="描述">
<el-input v-model="formData.description" type="textarea">el-input>
el-form-item>
el-col>
el-row>
el-form>
<div slot="footer" class="dialog-footer">
<el-button @click="dialogFormVisible = false">取消el-button>
<el-button type="primary" @click="saveBook()">确定el-button>
div>
el-dialog>
div>
div>
div>
div>
body>
<script src="../js/vue.js">script>
<script src="../plugins/elementui/index.js">script>
<script type="text/javascript" src="../js/jquery.min.js">script>
<script src="../js/axios-0.18.0.js">script>
<script>
var vue = new Vue({
el: '#app',
data:{
dataList: [],//当前页要展示的分页列表数据
formData: {},//表单数据
dialogFormVisible: false,//增加表单是否可见
dialogFormVisible4Edit:false,//编辑表单是否可见
pagination: {},//分页模型数据,暂时弃用
},
//钩子函数,VUE对象初始化完成后自动执行
created() {
this.getAll();
},
methods: {
// 重置表单
resetForm() {
//清空输入框
this.formData = {};
},
// 弹出添加窗口
openSave() {
this.dialogFormVisible = true;
this.resetForm();
},
//添加
saveBook () {
axios.post("/books",this.formData).then((res)=>{
});
},
//主页列表查询
getAll() {
axios.get("/books").then((res)=>{
this.dataList = res.data;
});
},
}
})
script>
html>