from表单提交到action返回的是null怎么解决

时间：2023-01-22 00:05:57
这是SSH集成框架当我在进行数据添加的时候Action报空:这是我的异常
java.lang.NullPointerException
at action.ClaimVoucherAction.addClaimVoucher(ClaimVoucherAction.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:453)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:292)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:255)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:236)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:409)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1044)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

下面是我的action里面的代码 


package action;

@Results({ @Result(name = "input", location = "/Index.jsp"),

		@Result(name = "list", location = "/list.jsp") })

public class ClaimVoucherAction {

	/**

	 * 报销单主表信息

	 */

	private BizClaimVoucher claimVoucher = new BizClaimVoucher();

	private IItemsBiz itemsBiz;

	private IBizClaimVoucherBiz caimVoucherBiz;

	List<Items> lists;

	private String opr;


	/**

	 * 报销项目明细

	 */

	private Integer itemId[]; // 报销项目

	private Double amount[]; // 报销金额

	private String desc[]; // 报销是由


	private Map sessionMap = ActionContext.getContext().getSession();

	SysEmployee emp = (SysEmployee) sessionMap.get("emp");

	private Map requestMap = (Map) ActionContext.getContext().get("request");


	/**

	 * 添加明细

	 * @return

	 */

	@Action("addClaimVoucherActon")

	public String addClaimVouchers() {

		System.out.println("doadd------" + opr);

		Double summer=0D;	//计算总金额 

		BizClaimVoucherDetail detail=null;

		for (int i = 0; i < itemId.length; i++) {

			// 明细信息

			detail = new BizClaimVoucherDetail();

			detail.setClaimVoucher(claimVoucher);

			detail.setAccount(amount[i]); // 金额

			summer+=amount[i];

			detail.setDes(desc[i]);// 描述

			Items items = new Items();// 报销项目

			items.setItemsId(itemId[i]);

			detail.setItems(items);

			// 明细表添加到主表对象中去

			claimVoucher.getDetails().add(detail);

		}

		// 获取报销主表信息

		claimVoucher.setNextDealRole(emp);

		claimVoucher.setStatus("新创建");//状态

		claimVoucher.setCreator(emp);

		claimVoucher.setCreateTime(new Date());	//创建时间

		claimVoucher.setLastUpdateDate(new Date());//修改时间

		claimVoucher.setEvent(claimVoucher.getEvent());

		claimVoucher.setLastUpdatedBy(emp.getSn().toString());//创建人

		claimVoucher.setTotalAccount(summer);//报销总金额


		// 执行save保存报销单信息

		try {

			caimVoucherBiz.addClaimVoucher(claimVoucher);

		} catch (Exception e) {

			e.printStackTrace();

		}

		return "list";

	}

//省略 get/set方法

}


下面是我的实现方法
[code=java]
public class BizClaimVoucherDaoImpl extends HibernateDaoSupport implements IBizClaimVoucherDao{
/**
 * 添加报销单信息
 */
public void addClaimVoucher(BizClaimVoucher cv) {
this.getHibernateTemplate().save(cv);
}
}

9 个解决方案

#1

这是我的spring.xml文件 


<?xml version="1.0" encoding="UTF-8"?>

<beans

	xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.1.xsd

http://www.springframework.org/schema/tx

http://www.springframework.org/schema/tx/spring-tx-3.1.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-3.1.xsd"

	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

	xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xmlns="http://www.springframework.org/schema/beans">

	<bean

		class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer"

		id="config">

		<property name="locations">

			<list>

				<value>classpath:dataSource.properties</value>

			</list>

		</property>

	</bean>


	<bean class="org.apache.commons.dbcp.BasicDataSource" id="dbConnection">

		<property name="url" value="${mysql.url}" />

		<property name="driverClassName" value="${mysql.driver}" />

		<property name="username" value="${mysql.username}" />

		<property name="password" value="${mysql.password}" />

		<property name="defaultAutoCommit" value="false" />

	</bean>


	<!-- 配置Session工厂 -->

	<bean

		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"

		id="sFactory">

		<!-- 注入dataSource ref指向我们配置的数据源的beanId -->

		<property name="dataSource" ref="dbConnection" />

		<!-- 配置hibernate的连接参数 -->

		<property name="hibernateProperties">

			<props>

				<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>

				<prop key="hibernate.show_sql">true</prop>

				<prop key="hibernate.format_sql">true</prop>

				<prop key="autocommit">false</prop>

			</props>

		</property>

		<!-- 扫描实体类对应的package -->

		<property name="packagesToScan" value="entity" />

	</bean>


	<!-- 配置事务管理器 -->

	<bean class="org.springframework.orm.hibernate3.HibernateTransactionManager"

		id="transactionManager">

		<property name="sessionFactory" ref="sFactory" />

	</bean>

	<!-- 配置事务通知,引用事务管理器 -->

	<tx:advice id="advice" transaction-manager="transactionManager">

		<tx:attributes>

			<!-- 所有的insert开头方法,都会由advice来进行管理 -->

			<tx:method name="insert*" propagation="REQUIRED" read-only="false"/>

			<tx:method name="add*" propagation="REQUIRED" read-only="false"/>

			<tx:method name="addClaimVoucher" propagation="REQUIRED"/>

		</tx:attributes>

	</tx:advice>

	<!-- 定义切面编程 -->

	<aop:config>

		<aop:pointcut id="insertPointCut" expression="execution(* biz..*.*(..))" />

		<!-- 使用切面编程,配置事务管理,在业务方法的持久化操作前后加入事务管理 -->

		<aop:advisor pointcut-ref="insertPointCut" advice-ref="advice" />

	</aop:config>

	<!-- 配置事务 -->

	<bean id="deptDao" class="dao.impl.UserDaoImpl">

		<property name="sessionFactory" ref="sFactory" />

	</bean>


	<bean id="userbiz" class="biz.impl.UserBizImpl" scope="prototype">

		<property name="dao" ref="deptDao"></property>

	</bean>


	<bean id="deptAction" class="action.userAction">

		<property name="userbiz" ref="userbiz" />

	</bean>

	<!-- 报销主表 -->

	<bean id="claimVoucherDao" class="dao.impl.BizClaimVoucherDaoImpl">

		<property name="sessionFactory" ref="sFactory" />

	</bean>


	<bean id="claimVoucherBiz" class="biz.impl.BizClaimVoucherBizIMpl">

		<property name="cvDao" ref="claimVoucherDao"></property>

	</bean>

	<bean id="voucherAction" class="action.ClaimVoucherAction" scope="prototype">

		<property name="itemsBiz" ref="itemsBiz"></property>

		<property name="caimVoucherBiz" ref="claimVoucherBiz"></property>

	</bean>

</beans>

#2

该回复于2017-01-22 08:30:15被管理员删除

#3

 private IBizClaimVoucherBiz caimVoucherBiz; 加set方法

#4

private BizClaimVoucher claimVoucher = new BizClaimVoucher();
改成
private BizClaimVoucher claimVoucher;
并加上set方法

#5

private BizClaimVoucher claimVoucher = new BizClaimVoucher();
是实体类

#6

引用 3 楼 baidu_22195437 的回复:
 private IBizClaimVoucherBiz caimVoucherBiz; 加set方法
这个是实体类

#7

引用 4 楼 baidu_22195437 的回复:
private BizClaimVoucher claimVoucher = new BizClaimVoucher();
改成
private BizClaimVoucher claimVoucher;
并加上set方法
这个是实体类

#8

java.lang.NullPointerException
at action.ClaimVoucherAction.addClaimVoucher(ClaimVoucherAction.java:101)
看这里

#9

caimVoucherBiz这个是空的

#1

这是我的spring.xml文件 


<?xml version="1.0" encoding="UTF-8"?>

<beans

	xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.1.xsd

http://www.springframework.org/schema/tx

http://www.springframework.org/schema/tx/spring-tx-3.1.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-3.1.xsd"

	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"

	xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xmlns="http://www.springframework.org/schema/beans">

	<bean

		class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer"

		id="config">

		<property name="locations">

			<list>

				<value>classpath:dataSource.properties</value>

			</list>

		</property>

	</bean>


	<bean class="org.apache.commons.dbcp.BasicDataSource" id="dbConnection">

		<property name="url" value="${mysql.url}" />

		<property name="driverClassName" value="${mysql.driver}" />

		<property name="username" value="${mysql.username}" />

		<property name="password" value="${mysql.password}" />

		<property name="defaultAutoCommit" value="false" />

	</bean>


	<!-- 配置Session工厂 -->

	<bean

		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"

		id="sFactory">

		<!-- 注入dataSource ref指向我们配置的数据源的beanId -->

		<property name="dataSource" ref="dbConnection" />

		<!-- 配置hibernate的连接参数 -->

		<property name="hibernateProperties">

			<props>

				<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>

				<prop key="hibernate.show_sql">true</prop>

				<prop key="hibernate.format_sql">true</prop>

				<prop key="autocommit">false</prop>

			</props>

		</property>

		<!-- 扫描实体类对应的package -->

		<property name="packagesToScan" value="entity" />

	</bean>


	<!-- 配置事务管理器 -->

	<bean class="org.springframework.orm.hibernate3.HibernateTransactionManager"

		id="transactionManager">

		<property name="sessionFactory" ref="sFactory" />

	</bean>

	<!-- 配置事务通知,引用事务管理器 -->

	<tx:advice id="advice" transaction-manager="transactionManager">

		<tx:attributes>

			<!-- 所有的insert开头方法,都会由advice来进行管理 -->

			<tx:method name="insert*" propagation="REQUIRED" read-only="false"/>

			<tx:method name="add*" propagation="REQUIRED" read-only="false"/>

			<tx:method name="addClaimVoucher" propagation="REQUIRED"/>

		</tx:attributes>

	</tx:advice>

	<!-- 定义切面编程 -->

	<aop:config>

		<aop:pointcut id="insertPointCut" expression="execution(* biz..*.*(..))" />

		<!-- 使用切面编程,配置事务管理,在业务方法的持久化操作前后加入事务管理 -->

		<aop:advisor pointcut-ref="insertPointCut" advice-ref="advice" />

	</aop:config>

	<!-- 配置事务 -->

	<bean id="deptDao" class="dao.impl.UserDaoImpl">

		<property name="sessionFactory" ref="sFactory" />

	</bean>


	<bean id="userbiz" class="biz.impl.UserBizImpl" scope="prototype">

		<property name="dao" ref="deptDao"></property>

	</bean>


	<bean id="deptAction" class="action.userAction">

		<property name="userbiz" ref="userbiz" />

	</bean>

	<!-- 报销主表 -->

	<bean id="claimVoucherDao" class="dao.impl.BizClaimVoucherDaoImpl">

		<property name="sessionFactory" ref="sFactory" />

	</bean>


	<bean id="claimVoucherBiz" class="biz.impl.BizClaimVoucherBizIMpl">

		<property name="cvDao" ref="claimVoucherDao"></property>

	</bean>

	<bean id="voucherAction" class="action.ClaimVoucherAction" scope="prototype">

		<property name="itemsBiz" ref="itemsBiz"></property>

		<property name="caimVoucherBiz" ref="claimVoucherBiz"></property>

	</bean>

</beans>

#2

该回复于2017-01-22 08:30:15被管理员删除

#3

 private IBizClaimVoucherBiz caimVoucherBiz; 加set方法

#4

private BizClaimVoucher claimVoucher = new BizClaimVoucher();
改成
private BizClaimVoucher claimVoucher;
并加上set方法

#5

private BizClaimVoucher claimVoucher = new BizClaimVoucher();
是实体类

#6

引用 3 楼 baidu_22195437 的回复:
 private IBizClaimVoucherBiz caimVoucherBiz; 加set方法
这个是实体类

#7

引用 4 楼 baidu_22195437 的回复:
private BizClaimVoucher claimVoucher = new BizClaimVoucher();
改成
private BizClaimVoucher claimVoucher;
并加上set方法
这个是实体类

#8

java.lang.NullPointerException
at action.ClaimVoucherAction.addClaimVoucher(ClaimVoucherAction.java:101)
看这里

#9

caimVoucherBiz这个是空的
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