struts2+spring，aciton引用业务逻辑对象时，不能set，只能构造?

Question

环境：struts-2.1.8.1+spring-framework-2.0.8+MyEclipse 5.5.1 GA
jar:
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
commons-logging-1.0.4.jar
freeer-2.3.15.jar
ognl-2.7.3.jar
spring.jar
struts2-core-2.1.8.1.jar
struts2-spring-plugin-2.1.8.1.jar
xwork-core-2.1.6.jar
代码：package com.telezone.services;public interface IUserinfo { public boolean login(String username, String password);
}---------------------------------------
package com.telezone.servicesImpl;import com.telezone.services.IUserinfo;public class UserinfoImpl implements IUserinfo {

public boolean login(String username, String password) {
if ("sys".equals(username) && "123".equals(password)) {
return true;
}
return false;
}}---------------------------------------
package com.telezone.actions;import com.opensymphony.xwork2.ActionSupport;
import com.telezone.services.IUserinfo;public class UserinfoAction extends ActionSupport { private static final long serialVersionUID = 1L; private String username; private String password; private IUserinfo userinfo;
      
       //省略get(),set()  /*
        换成构造函数就不会报错说找不到userinfo
        public UserinfoAction(IUserinfo userinfo) {
this.userinfo = userinfo;
}*/     
public String execute() throws Exception {
boolean islogin = userinfo
.login(this.getUsername(), this.getPassword());
System.out.println("islogin: " + islogin);
if (islogin) {
return SUCCESS;
}
return ERROR; }}
---------------------------------------
struts.xml
<struts>
<package name="default" extends="struts-default">
<action name="userinfo"
class="com.telezone.actions.UserinfoAction">
<result>/success.jsp</result>
<result name="error">/failed.jsp</result>
</action>
</package>
</struts>---------------------------------------
applicationContext.xml
<beans>
<bean id="userinfoImpl"
class="com.telezone.servicesImpl.UserinfoImpl">
</bean> <bean id="userinfoAction"
class="com.telezone.actions.UserinfoAction">
<!--<constructor-arg ref="userinfoImpl" /> -->
<property name="userinfo" ref="userinfoImpl"/>  
</bean>
</beans>
---------------------------------------
web.xml
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>   错误提示：java.lang.NullPointerException
com.telezone.actions.UserinfoAction.execute(UserinfoAction.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
其中UserinfoAction.java:25就是
boolean islogin = userinfo.login(this.getUsername(), this.getPassword());
这样的环境配置不支持set()还是我的配置有误？

Answer 1

userinfo没有在spring的配置文件中注入成功，看看你的配置文件

Answer 2

<bean id="userinfoAction"
        class="com.telezone.actions.UserinfoAction">
        <!--<constructor-arg ref="userinfoImpl" /> -->
        <property name="userinfo" ref="userinfoImpl"/>  
    </bean>
看看你这里...
用的是constructor-arg
构造参数啊...

Answer 3

/**
 * @param userinfo the userinfo to set
 */
public void setUserinfo(IUserinfo userinfo) {
System.out.println("注入成功");
this.userinfo = userinfo;
}
tomcat在启动时候在控制台有输出
注入成功所以，应该是有配置成功

Answer 4

看一下
public void setUserinfo(IUserinfo userinfo) {
        this.userinfo = userinfo;
        System.out.println(userinfo);
    }

Answer 5

在Action中定义：
private IUserinfo userinfoImpl;并有set方法。即可。

Answer 6

 public void setUserinfo(IUserinfo userinfo) {
               this.userinfo = userinfo;
 }这样就应该行了啊，只用set就行

Answer 7

[Quote=引用 7 楼,8楼 :]用了set报异常
 

Answer 8

你走运了，这个问题我测试过。
因为set方法中传递的是userinfo，而你配置中指向的是UserinfoImpl,可设置如下
<beans>
    <bean id="userinfo"
        class="com.telezone.servicesImpl.UserinfoImpl">
    </bean>    <bean id="userinfoAction"
        class="com.telezone.actions.UserinfoAction">
        <property name="userinfo" ref="userinfo"/>  
    </bean>

Answer 9

你的filter-mapping呢？  既然你用了struts2 在 struts.xml中就应该配置啊 还有 你的 属性就没有 getter() setter()方法 你 还怎么this.get..() 调用这个方法呢 是会报错的

Answer 10

java.lang.NullPointerException：
this.getUsername(),this.getPassword()值没有从页面取到，不知道你的页面是怎么写的