springmvc配置 | 小兵兵

springmvc

框架

发布日期: 2019-01-07

文章字数: 924

阅读时长: 4 分

阅读次数:

1、springmvc路径跳转配置

目录结构

控制层


<!-- 使用注解开发，不用配置controller，需要配置一个组件扫描器 -->
<context:component-scan base-package="com.*" />

<!-- 视图解析器 -->
<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <!-- 配置从项目根目录到指定目录一端路径 ,建议指定浅一点的目录 -->
    <property name="prefix" value="/WEB-INF/jsp/"></property>
    <!-- 文件的后缀名 -->
    <property name="suffix" value=".jsp"></property>
</bean>

<!--将index2.jsp放在/WEB-INF/jsp/目录下，请求index2时不经过controller处理;
配置了mvc:view-controller后需要配置mvc:annotation-driven,不然走controller的请求会失效 -->
<mvc:view-controller path="/index2"
    view-name="index2" />
<mvc:annotation-driven></mvc:annotation-driven>

<!--处理静态资源  -->
<mvc:default-servlet-handler/>

index.jsp


<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
<%

    request.setAttribute("path", request.getContextPath());
%>
</head>
<body>

    //走controller跳转
    <a href="hello">go controller</a>
    <br>

    //不走controller跳转，在springmvc配置文件中配置了mvc-view;index2.jsp页面需放在/WEB-INF/jsp/目录下
    <a href="index2">not go controller</a>
    <br/>

    //加载静态资源
    <a href="${path}/static/index3.jsp">load static resource index3.jsp</a>

    //加载静态资源，需在springmvc配置文件中配置mvc:default-servlet-handler
    <script type="text/javascript"
        src="${path}/ui/jquery/jquery-1.8.3.min.js"></script>

    <script type="text/javascript">
        $(function() {
            console.log("${path}")
        })
    </script>
</body>
</html>

2、springmvc获取请求参数，封装数据到请求域

前台



<form action='testParam' method='get'>
    用户名：<input type='text' name='username'>
    <button>提交</button>
</form>

控制层

处理方式一：
方法参数为Map或者ModelMap类型，数据封装到Map或者Modelmap类型中，其实就是将数据放入到请求域当中



@RequestMapping("/testParam")
public String testParam(ModelMap modelMap,HttpServletRequest request) {
    String username = request.getParameter("username");
    System.out.println("接收前台发送过来的请求参数=========>用户名："+username);

    //modelmap会将数据放到请求域当中
    modelMap.put("address", "haikou");
    //返回视图
    return "hello";
}

处理方式二：
用ModelAndView作为返回值，可以将数据放到请求域中且指定返回的视图


@RequestMapping("/testParam")
public ModelAndView testParam(HttpServletRequest request) {
    String username = request.getParameter("username");
    System.out.println("接收前台发送过来的请求参数=========>用户名："+username);

    //参数为返回的视图
    ModelAndView hello =new ModelAndView("hello");
    hello.addObject("address", "haikou");
    return hello;
}

前台获取


<!-- 获取后台封装在请求域中的数据 -->
地址：${requestScope.address}<br/>
<%=request.getAttribute("address")%>

3、springmvc处理文件上传

springmvc.xml增加如下配置


<!--文件上传  -->
<bean name="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding" value="UTF-8"></property>
    <property name="maxUploadSize" value="10240000"></property>
</bean>

前台表单提交


//必须是post请求，且enctype='multipart/form-data'
<form action='testFileUpload' method='post' enctype='multipart/form-data'>
    文件：<input type='file' name='file' ><br/>
    <button>提交</button>
</form>

控制层


@RequestMapping("/testFileUpload")
public String testFileUpload(@RequestParam("file")MultipartFile file) throws IOException {
    //获取文件名
    String fileName=file.getOriginalFilename();
    //获取流，即可取得内容
    InputStream in=file.getInputStream();
    System.out.println("文件名===========>"+fileName);
    return "hello";
}

4、springmvc返回json数据

pom.xml加入依赖


<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.9.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.9.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.9.6</version>
    </dependency>

控制层


//需要加@ResponseBody注解
@RequestMapping("/testJson")
@ResponseBody
public Map testFileUpload() {
    Map<String, Object> map=new HashMap<>();
    map.put("username", "沈利兵");
    map.put("sex", "男");
    return map;
}