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request里面获取值为空

来源：4-13 前后端联调验证整体模块功能

Fidel_Yiu

2019-05-07

第一个地方

@RequestMapping(value = "/registershop", method = RequestMethod.POST)
    @ResponseBody
    private Map<String, Object> registerShop(HttpServletRequest request) {
        Map<String, Object> modelMap = new HashMap<String, Object>();
        if (!CodeUtil.checkVerifyCode(request)) {
            // 错误返回页面
        }
        // ↓这里shopStr执行之后是null
        String shopStr = HttpServletRequestUtil.getString(request, "shopStr");
        ObjectMapper mapper = new ObjectMapper();
        Shop shop = null;
        try {
	        // ↓因为shopStr是null，所以这里也报异常
            shop = mapper.readValue(shopStr, Shop.class);
        } catch (Exception e) {
            // 错误返回页面
        }

第二个地方

public class CodeUtil {
	// ↓检查验证码是否和预期相符
    public static boolean checkVerifyCode(HttpServletRequest request) {
        String verifyCodeExpected = (String) request.getSession()
                .getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
        // ↓这里获取是空，所以验证码一直报错
        String verifyCodeActual = HttpServletRequestUtil.getString(request, "verifyCodeActual");
        // ↓用原来的获取方法也是空的
        // String verifyCodeActual = (String) request.getParameter("verifyCodeActual");
        if (verifyCodeActual == null || !verifyCodeActual.equals(verifyCodeExpected)) {
            return false;
        }
        return true;
    }
}

前端传入的数据
图片描述

写回答

3回答

翔仔

2019-05-08

已采纳

controller

import javax.servlet.http.HttpServletRequest;

package com.imooc.o2o.web.shopadmin;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

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.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.imooc.o2o.dto.ImageHolder;
import com.imooc.o2o.dto.ShopExecution;
import com.imooc.o2o.entity.Area;
import com.imooc.o2o.entity.PersonInfo;
import com.imooc.o2o.entity.Shop;
import com.imooc.o2o.entity.ShopCategory;
import com.imooc.o2o.enums.ShopStateEnum;
import com.imooc.o2o.exceptions.ShopOperationException;
import com.imooc.o2o.service.AreaService;
import com.imooc.o2o.service.ShopCategoryService;
import com.imooc.o2o.service.ShopService;
import com.imooc.o2o.util.CodeUtil;
import com.imooc.o2o.util.HttpServletRequestUtil;

@Controller
@RequestMapping("/shopadmin")
public class ShopManagementController {
	@Autowired
	private ShopService shopService;
	@Autowired
	private ShopCategoryService shopCategoryService;
	@Autowired
	private AreaService areaService;

	@RequestMapping(value = "/getshopmanagementinfo", method = RequestMethod.GET)
	@ResponseBody
	private Map<String, Object> getShopManagementInfo(HttpServletRequest request) {
		Map<String, Object> modelMap = new HashMap<String, Object>();
		long shopId = HttpServletRequestUtil.getLong(request, "shopId");
		if (shopId <= 0) {
			Object currentShopObj = request.getSession().getAttribute("currentShop");
			if (currentShopObj == null) {
				modelMap.put("redirect", true);
				modelMap.put("url", "/myo2o/shopadmin/shoplist");
			} else {
				Shop currentShop = (Shop) currentShopObj;
				modelMap.put("redirect", false);
				modelMap.put("shopId", currentShop.getShopId());
			}
		} else {
			Shop currentShop = new Shop();
			currentShop.setShopId(shopId);
			request.getSession().setAttribute("currentShop", currentShop);
			modelMap.put("redirect", false);
		}
		return modelMap;
	}

	@RequestMapping(value = "/getshoplist", method = RequestMethod.GET)
	@ResponseBody
	private Map<String, Object> getShopList(HttpServletRequest request) {
		Map<String, Object> modelMap = new HashMap<String, Object>();
		PersonInfo user = (PersonInfo) request.getSession().getAttribute("user");
		try {
			Shop shopCondition = new Shop();
			shopCondition.setOwner(user);
			ShopExecution se = shopService.getShopList(shopCondition, 0, 100);
			modelMap.put("shopList", se.getShopList());
			// 列出店铺成功之后，将店铺放入session中作为权限验证依据，即该帐号只能操作它自己的店铺
			request.getSession().setAttribute("shopList", se.getShopList());
			modelMap.put("user", user);
			modelMap.put("success", true);
		} catch (Exception e) {
			modelMap.put("success", false);
			modelMap.put("errMsg", e.getMessage());
		}
		return modelMap;
	}

	@RequestMapping(value = "/getshopbyid", method = RequestMethod.GET)
	@ResponseBody
	private Map<String, Object> getShopById(HttpServletRequest request) {
		Map<String, Object> modelMap = new HashMap<String, Object>();
		Long shopId = HttpServletRequestUtil.getLong(request, "shopId");
		if (shopId > -1) {
			try {
				Shop shop = shopService.getByShopId(shopId);
				List<Area> areaList = areaService.getAreaList();
				modelMap.put("shop", shop);
				modelMap.put("areaList", areaList);
				modelMap.put("success", true);
			} catch (Exception e) {
				modelMap.put("success", false);
				modelMap.put("errMsg", e.toString());
			}
		} else {
			modelMap.put("success", false);
			modelMap.put("errMsg", "empty shopId");
		}
		return modelMap;
	}

	@RequestMapping(value = "/getshopinitinfo", method = RequestMethod.GET)
	@ResponseBody
	private Map<String, Object> getShopInitInfo() {
		Map<String, Object> modelMap = new HashMap<String, Object>();
		List<ShopCategory> shopCategoryList = new ArrayList<ShopCategory>();
		List<Area> areaList = new ArrayList<Area>();
		try {
			shopCategoryList = shopCategoryService.getShopCategoryList(new ShopCategory());
			areaList = areaService.getAreaList();
			modelMap.put("shopCategoryList", shopCategoryList);
			modelMap.put("areaList", areaList);
			modelMap.put("success", true);
		} catch (Exception e) {
			modelMap.put("success", false);
			modelMap.put("errMsg", e.getMessage());
		}
		return modelMap;
	}

	@RequestMapping(value = "/registershop", method = RequestMethod.POST)
	@ResponseBody
	private Map<String, Object> registerShop(HttpServletRequest request) {
		Map<String, Object> modelMap = new HashMap<String, Object>();
		if (!CodeUtil.checkVerifyCode(request)) {
			modelMap.put("success", false);
			modelMap.put("errMsg", "输入了错误的验证码");
			return modelMap;
		}
		// 1.接收并转化相应的参数，包括店铺信息以及图片信息
		String shopStr = HttpServletRequestUtil.getString(request, "shopStr");
		ObjectMapper mapper = new ObjectMapper();
		Shop shop = null;
		try {
			shop = mapper.readValue(shopStr, Shop.class);
		} catch (Exception e) {
			modelMap.put("success", false);
			modelMap.put("errMsg", e.getMessage());
			return modelMap;
		}
		CommonsMultipartFile shopImg = null;
		CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(
				request.getSession().getServletContext());
		if (commonsMultipartResolver.isMultipart(request)) {
			MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) request;
			shopImg = (CommonsMultipartFile) multipartHttpServletRequest.getFile("shopImg");			
		} else {
			modelMap.put("success", false);
			modelMap.put("errMsg", "上传图片不能为空");
			return modelMap;
		}
		// 2.注册店铺
		if (shop != null && shopImg != null) {
			PersonInfo owner = (PersonInfo) request.getSession().getAttribute("user");
			shop.setOwner(owner);
			ShopExecution se;
			try {
				ImageHolder imageHolder = new ImageHolder(shopImg.getOriginalFilename(), shopImg.getInputStream());
				se = shopService.addShop(shop, imageHolder);
				if (se.getState() == ShopStateEnum.CHECK.getState()) {
					modelMap.put("success", true);
					// 该用户可以操作的店铺列表
					@SuppressWarnings("unchecked")
					List<Shop> shopList = (List<Shop>) request.getSession().getAttribute("shopList");
					if (shopList == null || shopList.size() == 0) {
						shopList = new ArrayList<Shop>();
					}
					shopList.add(se.getShop());
					request.getSession().setAttribute("shopList", shopList);
				} else {
					modelMap.put("success", false);
					modelMap.put("errMsg", se.getStateInfo());
				}
			} catch (ShopOperationException e) {
				modelMap.put("success", false);
				modelMap.put("errMsg", e.getMessage());
			} catch (IOException e) {
				modelMap.put("success", false);
				modelMap.put("errMsg", e.getMessage());
			}
			return modelMap;
		} else {
			modelMap.put("success", false);
			modelMap.put("errMsg", "请输入店铺信息");
			return modelMap;
		}
	}
}


0
1
Fidel_Yiu
谢谢老师，具体问题我已经找到了，在我得回复里面
2019-05-08
共1条回复

Fidel_Yiu

提问者

2019-05-08

按照老师给的代码，自己看了一下，做了两个改动，代码测试成功了。

但是我不知道是哪个影响的。

  1. spring-web.xml

```xml

<!-- 3.定义视图解析器 -->
<bean id="viewResolver"
     class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   <property name="prefix" value="/WEB-INF/html/"></property>
   <property name="suffix" value=".html"></property>
</bean>
<!-- 文件上传解析器 -->
<bean id="multipartResolver"
     class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
   <property name="defaultEncoding" value="utf-8"></property>
   <!-- 1024 * 1024 * 20 = 20M -->
   <property name="maxUploadSize" value="20971520"></property>
   <property name="maxInMemorySize" value="20971520"></property>
</bean>

```

> 第三个这里多了一个文件上传解析器，之前跟着老师敲得代码，也不知道为什么这里少了这个。


2.pom.xml

在插件那一块，我原来得代码

```xml

<plugins>
 <plugin>
   <artifactId>maven-clean-plugin</artifactId>
   <version>3.1.0</version>
 </plugin>
 <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
 <plugin>
   <artifactId>maven-resources-plugin</artifactId>
   <version>3.0.2</version>
 </plugin>
 <plugin>
   <artifactId>maven-compiler-plugin</artifactId>
   <version>3.8.0</version>
 </plugin>
 <plugin>
   <artifactId>maven-surefire-plugin</artifactId>
   <version>2.22.1</version>
 </plugin>
 <plugin>
   <artifactId>maven-war-plugin</artifactId>
   <version>3.2.2</version>
 </plugin>
 <plugin>
   <artifactId>maven-install-plugin</artifactId>
   <version>2.5.2</version>
 </plugin>
 <plugin>
   <artifactId>maven-deploy-plugin</artifactId>
   <version>2.8.2</version>
 </plugin>
</plugins>

```

老师得代码

```xml

<plugins>
 <plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-compiler-plugin</artifactId>
   <version>3.6.1</version>
   <configuration>
     <source>1.8</source>
     <target>1.8</target>
     <encoding>UTF8</encoding>
   </configuration>
 </plugin>
</plugins>

```

> 因为我是使用IDEA自己新建得Maven项目，所以这里IDEA帮我加的，当时我以为这里官方应该加的应该没什么问题，所以就没管了。现在改过来就好了

1
1
翔仔
赞同学的错误解决和分享能力：）
2019-05-08
共1条回复

翔仔

2019-05-08

感觉是spring-web.xml或者import的request类型弄错了？可以直接复制粘贴我的ok的例子，没问题后，看看那差距在哪里

spring-web.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
    <!-- 配置SpringMVC -->
    <!-- 1.开启SpringMVC注解模式 -->
    <mvc:annotation-driven />
 
    <!-- 2.静态资源默认servlet配置 (1)加入对静态资源的处理：js,gif,png (2)允许使用"/"做整体映射 -->
    <mvc:resources mapping="/resources/**" location="/resources/" />
    <mvc:default-servlet-handler />
 
    <!-- 3.定义视图解析器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/html/"></property>
        <property name="suffix" value=".html"></property>
    </bean>
    <!-- 文件上传解析器 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"></property>
        <!-- 1024 * 1024 * 20 = 20M -->
        <property name="maxUploadSize" value="20971520"></property>
        <property name="maxInMemorySize" value="20971520"></property>
    </bean>
 
    <!-- 4.扫描web相关的bean -->
    <context:component-scan base-package="com.imooc.o2o.web" />
</beans>

pom.xml

<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.imooc</groupId>
	<artifactId>o2o</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>bsp Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<properties>
		<spring.version>4.3.7.RELEASE</spring.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic -->
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.3</version>
		</dependency>
		<!-- Spring -->
		<!-- 1)包含Spring 框架基本的核心工具类。Spring 其它组件要都要使用到这个包里的类，是其它组件的基本核心 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 2)这个jar 文件是所有应用都要用到的，它包含访问配置文件、创建和管理bean 以及进行Inversion of Control 
			/ Dependency Injection（IoC/DI）操作相关的所有类。如果应用只需基本的IoC/DI 支持，引入spring-core.jar 
			及spring-beans.jar 文件就可以了。 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 3)这个jar 文件为Spring 核心提供了大量扩展。可以找到使用Spring ApplicationContext特性时所需的全部类，JDNI 
			所需的全部类，instrumentation组件以及校验Validation 方面的相关类。 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 4) 这个jar 文件包含对Spring 对JDBC 数据访问进行封装的所有类。 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 5) 为JDBC、Hibernate、JDO、JPA等提供的一致的声明式和编程式事务管理。 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-tx</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 6)Spring web 包含Web应用开发时，用到Spring框架时所需的核心类，包括自动载入WebApplicationContext特性的类、Struts与JSF集成类、文件上传的支持类、Filter类和大量工具辅助类。 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 7)包含SpringMVC框架相关的所有类。 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 8)Spring test 对JUNIT等测试框架的简单封装 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
			<scope>test</scope>
		</dependency>
		<!-- Servlet web -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
		</dependency>
		<!-- json解析 -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.8.7</version>
		</dependency>
		<!-- Map工具类 对标准java Collection的扩展 spring-core.jar需commons-collections.jar -->
		<dependency>
			<groupId>commons-collections</groupId>
			<artifactId>commons-collections</artifactId>
			<version>3.2</version>
		</dependency>
		<!-- DAO: MyBatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.2</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.1</version>
		</dependency>
		<!-- 数据库 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.37</version>
		</dependency>
		<dependency>
			<groupId>c3p0</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.1.2</version>
		</dependency>
		<!-- 图片处理 -->
		<!-- https://mvnrepository.com/artifact/net.coobird/thumbnailator -->
		<dependency>
			<groupId>net.coobird</groupId>
			<artifactId>thumbnailator</artifactId>
			<version>0.4.8</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/com.github.penggle/kaptcha -->
		<dependency>
			<groupId>com.github.penggle</groupId>
			<artifactId>kaptcha</artifactId>
			<version>2.3.2</version>
		</dependency>
		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.2</version>
		</dependency>
		<!-- redis客户端:Jedis -->
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
			<version>2.9.0</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>bsp</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.6.1</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<encoding>UTF8</encoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

shopoperation.js

/**
 * 
 */
$(function(){
	var initUrl = '/o2o/shopadmin/getshopinitinfo';
	var registerShopUrl = '/o2o/shopadmin/registershop';
	alert(initUrl);
	getShopInitInfo();
	function getShopInitInfo(){
		$.getJSON(initUrl,function(data){
			if(data.success){
				var tempHtml = '';
				var tempAreaHtml = '';
				data.shopCategoryList.map(function(item,index){
					tempHtml += '<option data-id="' + item.shopCategoryId + '">'
					+ item.shopCategoryName+'</option>';
				});
				data.areaList.map(function(item,index){
					tempAreaHtml += '<option data-id="' + item.areaId + '">'
					+item.areaName +'</option>';
				});
				$('#shop-category').html(tempHtml);
				$('#area').html(tempAreaHtml);
			}
		});
		$('#submit').click(function(){
			var shop = {};
			shop.shopName = $('#shop-name').val();
			shop.shopAddr = $('#shop-addr').val();
			shop.phone = $('#shop-phone').val();
			shop.shopDesc = $('#shop-desc').val();
			shop.shopCategory = {
					shopCategoryId : $('#shop-category').find('option').not(function(){
						return !this.selected;					
					}).data('id')
			};
			shop.area = {
					areaId : $('#area').find('option').not(function(){
						return !this.selected;					
					}).data('id')
			};
			var shopImg = $('#shop-img')[0].files[0];
			var formData = new FormData();
			formData.append('shopImg',shopImg);
			formData.append('shopStr',JSON.stringify(shop));
			var verifyCodeActual = $('#j_captcha').val();
	        if (!verifyCodeActual) {
	            $.toast('请输入验证码！');
	            return;
	        }
			formData.append('verifyCodeActual',verifyCodeActual);
			$.ajax({
				url : registerShopUrl,
				type : 'POST',
				data : formData,
				contentType : false,
				processData : false,
				cache : false,
				success : function(data){
					if(data.success){
						$.toast('提交成功！');
					}else{
						$.toast('提交失败！' + data.errMsg);
					}
					$('#captcha_img').click();
				}
			});
		});
	}
})


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Java双版本（SSM到SpringBoot）校园商铺全栈开发

SSM商铺V1.0，解决毕设痛点；SpringBoot商铺V2.0，满足工作刚需

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