SpringMvc的集成&NoSession

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原创最新推荐文章于 2026-09-13 11:37:18 发布 307 阅读 AI 写同款· GEO 优化 ›

spring MVC No Session found for current thread NULL 博文链接：https://hw1287789687.iteye.com/blog/1949852 立即下载

SpringMvc的集成&web.xml解决noSession

1.在pom.xml引入相应jar包

<!-- 引入web前端的支持 -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>${org.springframework.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>${org.springframework.version}</version>
</dependency>

2.配置applicationContext-mvc.xml

可以为SpringMVC单独配置一个Xml,让它与核心applicationContext.xml分开。让xml的配置成为模块化配置。

<?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.xsd
    ">
    <!-- 对静态资源进行放行 -->
    <mvc:default-servlet-handler />
    <!-- 扫描controller部分的包 -->
    <!-- @Component组件, @Repository持久层, @Service业务逻辑层, and @Controller控制器 -->
    <context:component-scan base-package="cn.itsource.pss.web" />
    <!-- 添加mvc对@RequestMapping等注解的支持 -->
    <mvc:annotation-driven />

    <!-- ViewResolver 视图解析器 (struts2视图类型类似) -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 设置视图路径的前后缀，该配置可以让我们写视图路径的时候更简单。 -->
        <!-- 希望跳转jsp是[/WEB-INF/views/前缀][xxx变量][.jsp后缀] -->
        <!-- * @see #setPrefix -->
        <property name="prefix" value="/WEB-INF/views/" />
        <!-- * @see #setSuffix -->
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 错误：提示告诉开发者你没有配置文件上传解析器。 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设置上传文件的最大尺寸为1MB -->
        <property name="maxUploadSize">
            <value>1048576</value>
        </property>
    </bean>
</beans>

3…配置web.xml

3.1修改版本

如果web.xml的版本是2.3的，那请将它的版本修改成2.4及以上版本，因为这个版本不支持EL表达式。
这是个错误的版本
以下为正确的版本：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         id="WebApp_ID" version="3.1">

</web-app>

3.2.完成applicationContext.xml的配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/x8ml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         id="WebApp_ID" version="3.1">

    <!-- 读取SpringMVC -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <!-- 启动Spring的监听器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 配置核心控制器-->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <!-- 告诉SpringMVC到哪里去找配置文件 -->
            <param-name>contextConfigLocation</param-name>
            <!-- 注意:这里只读取springmvc的xml -->
            <param-value>classpath:applicationContext-mvc.xml</param-value>
        </init-param>
        <!-- Servlet默认在每一次访问的时候创建 -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

 <!--  配置解决中文乱码的问题 -->
    <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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

4.创建Controller与employee.jsp页面

4.1.EmployeeController

package cn.itsource.pss.controller;

import cn.itsource.pss.domain.Employee;
import cn.itsource.pss.service.IEmployeeService;
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.ResponseBody;

import java.util.List;

@Controller
@RequestMapping("/employee")
public class EmployeeController {

    @Autowired
    private IEmployeeService employeeService;

    @RequestMapping("/index")
    public String index() {
        //根据配置，这里会跳到/WEB-INF/views/employee/employee.jsp页面
        return "employee/employee";
    }
    @RequestMapping("/list")
    @ResponseBody
    public List<Employee> list(){
        return employeeService.findAll();
    }
}

4.2.employee.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>访问成功</h1>
</body>
</html>

5.功能测试

配置：File > Project Structure > Artifacts > 在右侧Output Layout右击项目名，选择Put into Output Root
在这里插入图片描述
输入路径 http://localhost/employee/index 查看是否访问成功
输入路径 http://localhost/employee/list 查看是否返回数据
如果访问没有问题，就代表集成已完成！

7.No serializer

noSession:过早关闭了EntityManager(Session)

No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) )

这个错是SpringMVC与Jpa集成的时候(有懒加载)就会出现这个问题。因为你需要序列化对象有一个属性是一类类型，而你使用了Hibernate的延迟加载所以这里是个Hibernate的代理对象。该代理对象有些属性不能被序列化所以会报错。
在类上加属性：生成的时候把这个字段忽略了：

@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler","fieldHandler"})

解决方案：
第一步：创建一个新的类(重写com.fasterxml.jackson.databind.ObjectMapper)

package cn.itsource.pss.common;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

public class CustomMapper extends ObjectMapper {
    public CustomMapper() {
        this.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        // 设置 SerializationFeature.FAIL_ON_EMPTY_BEANS 为 false
        this.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    }
}

第二步：在applicationContext-mvc.xml中配置

<!-- Spring MVC 配置 -->
<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="supportedMediaTypes">
                <list>
                    <value>application/json; charset=UTF-8</value>
                    <value>application/x-www-form-urlencoded; charset=UTF-8</value>
                </list>
            </property>
            <!-- No serializer:配置 objectMapper 为我们自定义扩展后的 CustomMapper,解决了返回对象有关系对象的报错问题 -->
            <property name="objectMapper">
                <bean class="cn.itsource.pss.common.CustomMapper"></bean>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

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