Struts2.2.3.1，Method "setStudent" failed for object com.city.action.Up

Struts2.2.3.1，Method "setStudent" failed for object com.city.action.UpdateAction
在自学struts2 就自己写了个小的管理程序
在对信息进行修改的时候出错了，请大家帮帮忙
struts.xml

XML code

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <constant name="struts.enable.DynamicMethodInvocation" value="true" />    <constant name="struts.devMode" value="false" />    <package name="default" namespace="/" extends="struts-default">        <default-action-ref name="index" />                <action name="index" class="com.city.action.StudentAction">            <result name="success">/index.jsp</result>            <result name="update">/update.jsp</result>            <result name="add">/add.jsp</result>            <result name="goback" type="redirectAction">                    <param name="actionName">back</param>                <param name="namespace">/</param>            </result>        </action>        <action name="back" class="com.city.action.StudentAction">            <result name="success">            /index.jsp            </result>        </action>        <action name="add" class="com.city.action.AddAction">            <result name="goback" type="redirectAction">                    <param name="actionName">back</param>                <param name="namespace">/</param>            </result>        </action>        <action name="update" class="com.city.action.UpdateAction">            <result name="goback" type="redirectAction">                    <param name="actionName">back</param>                <param name="namespace">/</param>            </result>            <result name="input">            /error.jsp            </result>        </action>    </package>       <!-- Add packages here --></struts>

StudentAction

Java code

package com.city.action;import java.util.ArrayList;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import org.apache.struts2.interceptor.RequestAware;import org.apache.struts2.interceptor.ServletRequestAware;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.ActionSupport;import com.city.model.*;import com.city.server.StudentServer;public class StudentAction extends ActionSupport{        List<Student> list = new ArrayList<Student>();    HttpServletRequest request=ServletActionContext.getRequest();    private String id;    private Student student = new Student();        public HttpServletRequest getRequest() {        return request;    }    public void setRequest(HttpServletRequest request) {        this.request = request;    }    public Student getStudent() {        return student;    }    public void setStudent(Student student) {        this.student = student;    }    public List<Student> getList() {        return list;    }    public void setList(List<Student> list) {        this.list = list;    }//    public void setServletRequest(HttpServletRequest request){//        this.request = request;//    }    public String execute(){        list = new StudentServer().checkStuList();        return SUCCESS;    }        public String gotoUpdate(){        this.student = new StudentServer().checkStuById(Integer.parseInt(id));        return "update";    }        public String gotoAdd(){            return "add";    }    public String deleteStuById(){        new StudentServer().deleteStu(Integer.parseInt(id));        return "goback";    }        public void setId(String id) {        this.id = id;    }    public String getId() {        return id;    }} 
 

UpdateAction

Java code

package com.city.action;import com.city.model.Student;import com.city.server.StudentServer;import com.opensymphony.xwork2.ActionSupport;public class UpdateAction extends ActionSupport {    Student student = new Student();    public Student getStudent() {        return student;    }    public void setStudent(Student student) {        this.student = student;    }        public String updateSuccess(){        new StudentServer().updateStu(student);        return "goback";    }        public String updateCancle(){                return "goback";    }                    }

update.jsp

HTML code

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@taglib uri="/struts-tags" prefix="s" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'update.jsp' starting page</title>        <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>    <body>    This is my update page. <br>    <s:form action="update!updateSuccess" method="post">        <table>            <tr>                <td>                姓名：                </td>                <td>                <s:hidden name="student" theme="simple" value="<s:property value='student.id'/>" ></s:hidden>                    <input name="student.name" value="<s:property value="student.name"/>" ></input>                </td>            </tr>            <tr>                <td>                学号：                </td>                <td>                <input name="student.stu_no" value="<s:property value="student.stu_no"/>" ></input>                </td>            </tr>            <tr>                <td>                年龄：                </td>                <td>                <input name="student.age" value="<s:property value="student.age"/>" ></input>                </td>            </tr>            <tr>                <td>                <s:submit value="提交"></s:submit>                </td>                <td>                                </td>            </tr>        </table>    </s:form>    <table>        <tr><td><a href="update!updateCancle">返回</a></td></tr>    </table>    <br/>    <hr/>    <s:debug></s:debug>  </body></html>

报错信息：

警告: Error setting expression 'student' with value '[Ljava.lang.String;@1d5c645'
ognl.MethodFailedException: Method "setStudent" failed for object com.city.action.UpdateAction@1f15067 [java.lang.NoSuchMethodException: com.city.action.UpdateAction.setStudent([Ljava.lang.String;)]

at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1285)
at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:1474)
at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:85)
at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:162)
at com.opensymphony.xwork2.ognl.accessor.ObjectAccessor.setProperty(ObjectAccessor.java:27)
at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:2245)
java.lang.NoSuchMethodException: com.city.action.UpdateAction.setStudent([Ljava.lang.String;)

。。。。
我在网上查了下，有的人说是页面有重复信息，是不是我在StudentAction里面定义了student对象 在UpdateAction里面也定义了student对象 然后都放在了udapte.jsp页面造成了冲突，但是如果这样写的话，那我UpdateAction里面怎样获得update.jsp提交的值呢？？？求帮助


[解决办法]

java.lang.NoSuchMethodException: com.city.action.UpdateAction.setStudent([Ljava.lang.String;)

他是找不到setStudent方法，是不是要定义的，查一下


<action name="index" class="com.city.action.StudentAction">
<result name="success">/index.jsp</result>
<result name="update">/update.jsp</result>
<result name="add">/add.jsp</result>
<result name="goback" type="redirectAction">
<param name="actionName">back</param>
<param name="namespace">/</param>
</result>
</action>
[解决办法]
java.lang.NoSuchMethodException: com.city.action.UpdateAction.setStudent([Ljava.lang.String;)

UpdateAction中没找到setStudent方法，如果没有提供这个方法，传参数的时候肯定会报错。。。。
[解决办法]
<s:hidden name="student" theme="simple" value="<s:property value='student.id'/>" ></s:hidden>
改为
<s:hidden name="student.id" theme="simple" value="<s:property value='student.id'/>" ></s:hidden>
[解决办法]
9楼正解，应该是value="<s:property value='student.id'没有取到值，所以就报错“”不能转换为int,可以把student.id的值直接打印出来看看。
[解决办法]
，<s:hidden name="student.id" theme="simple" value="<s:property value='student.id'/>" ></s:hidden>
差不多就是这里出错了
public class UpdateAction extends ActionSupport {

Student student = new Student();

struts2 需要你去new 嘛？
private Student student;
[解决办法]
问题出在:

HTML code

<s:hidden name="student.id" theme="simple" value="<s:property value='student.id'/>" ></s:hidden>
[解决办法]
  断点 看下变量有没有值 

 

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