本文介绍了一个关于Struts2框架中boolean类型属性依赖注入的问题。当boolean属性名为is开头时，Struts2默认寻找setIs开头的setter方法进行注入，导致无法正确识别常规setter方法。文章给出了具体解决方案。
使用IDE：eclipse；
struts2的版本：2.3.4.1
登录界面代码如下：
<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>login</title>
</head>
<body>
<center>
<h1>login platform</h1>
<s:form action="/login" method="post" >
<table>
<tr><td>username:</td> <td><s:textfield name="user.username" ></s:textfield> </td></tr>
<tr><td>password:</td> <td><s:textfield name="user.password" ></s:textfield> </td></tr>
<tr><td>age:</td> <td><s:textfield name="user.age" ></s:textfield> </td></tr>
<tr><td>isBoy:</td> <td><s:textfield name="user.isBoy" ></s:textfield> </td></tr>
<tr> <td colspan="2"><s:submit value="login" ></s:submit> </td></tr>
</table>
</s:form>
</center>
</body>
</html>
对应的bean中有一个成员变量是：private boolean isBoy;（是boolean 类型的）
package com.jn.bean;
public class LoginUser {
private int age;
private String username;
private String password;
/***
* 是否是男性
*/
private boolean isBoy;
public LoginUser() {
super();
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public boolean isBoy() {
return isBoy;
}
public void setBoy(boolean isBoy) {
this.isBoy = isBoy;
}
}
其中的getter，setter方法都是使用eclipse自动生成的。
对应的action为：
package com.jn.action;
import com.jn.bean.LoginUser;
import com.opensymphony.xwork2.ActionSupport;
public class LoginVerifyAction extends ActionSupport {
private static final long serialVersionUID = -5532496750392156543L;
private LoginUser user;
@Override
public String execute() throws Exception {
System.out.println("user information:");
System.out.println("username:"+user.getUsername());
System.out.println("password:"+user.getPassword());
System.out.println("age:"+user.getAge());
System.out.println("isBoy:"+user.isBoy());
return super.execute();
}
public LoginUser getUser() {
return user;
}
public void setUser(LoginUser user) {
this.user = user;
}
}
但是登录时报错：
警告: Error setting expression 'user.isBoy' with value '[Ljava.lang.String;@863941' ognl.NoSuchPropertyException: com.jn.bean.LoginUser.isBoy [java.lang.IllegalAccessException: Class ognl.OgnlRuntime can not access a member of class com.jn.bean.LoginUser with modifiers "private"] at ognl.OgnlRuntime.setFieldValue(OgnlRuntime.java:1682) at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:87) at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162) at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2315) at ognl.ASTProperty.setValueBody(ASTProperty.java:127) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.ASTChain.setValueBody(ASTChain.java:227) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.Ognl.setValue(Ognl.java:737) at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:217) at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:186) at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:173) at com.opensymphony.xwork2.ognl.OgnlValueStack.setParameter(OgnlValueStack.java:151) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:317) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:228) 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:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 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:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.IllegalAccessException: Class ognl.OgnlRuntime can not access a member of class com.jn.bean.LoginUser with modifiers "private" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65) at java.lang.reflect.Field.doSecurityCheck(Field.java:960) at java.lang.reflect.Field.getFieldAccessor(Field.java:896) at java.lang.reflect.Field.set(Field.java:657) at ognl.OgnlRuntime.setFieldValue(OgnlRuntime.java:1674) ... 67 more /-- Encapsulated exception ------------\ java.lang.IllegalAccessException: Class ognl.OgnlRuntime can not access a member of class com.jn.bean.LoginUser with modifiers "private" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65) at java.lang.reflect.Field.doSecurityCheck(Field.java:960) at java.lang.reflect.Field.getFieldAccessor(Field.java:896) at java.lang.reflect.Field.set(Field.java:657) at ognl.OgnlRuntime.setFieldValue(OgnlRuntime.java:1674) at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:87) at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162) at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27) at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2315) at ognl.ASTProperty.setValueBody(ASTProperty.java:127) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.ASTChain.setValueBody(ASTChain.java:227) at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:220) at ognl.SimpleNode.setValue(SimpleNode.java:301) at ognl.Ognl.setValue(Ognl.java:737) at com.opensymphony.xwork2.ognl.OgnlUtil.setValue(OgnlUtil.java:217) at com.opensymphony.xwork2.ognl.OgnlValueStack.trySetValue(OgnlValueStack.java:186) at com.opensymphony.xwork2.ognl.OgnlValueStack.setValue(OgnlValueStack.java:173) at com.opensymphony.xwork2.ognl.OgnlValueStack.setParameter(OgnlValueStack.java:151) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:317) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:228) 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:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 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:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) \--------------------------------------/
错误信息说明，struts2没有找到isBoy 的setter方法，因为struts2认为isBoy 的setter方法名应该是setIsBoy
为什么会设置isBoy时就有问题呢？因为按照struts2 的依赖注入规则，setter方法应该是set+成员变量（首字母变为大写）。
我把isBoy的setter方法由setBoy 修改为setIsBoy，就好了。
public void setIsBoy(boolean isBoy) {
this.isBoy = isBoy;
}
总结：如果要依赖注入的属性是boolean类型并且属性名以is开头，就会出现上述问题。
解决方法：
如果使用struts2的依赖注入，那么boolean 类型的属性名不要以is开头。我修改方法是把属性名由isBoy改为boy：
package com.jn.bean;
public class LoginUser {
private int age;
private String username;
private String password;
/***
* 是否是男性
*/
private boolean boy;
public LoginUser() {
super();
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public boolean isBoy() {
return boy;
}
public void setBoy(boolean boy) {
this.boy = boy;
}
}
登录页面中把user.isBoy 改为user.boy 就好了。
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