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Java PropertyNotFoundException:Property'；X'；在类型X上找不到

java jsp struts2

Java PropertyNotFoundException:Property'；X'；在类型X上找不到,java,jsp,struts2,jstl,Java,Jsp,Struts2,Jstl,我有viewprofile操作，显示用户的详细信息和交易历史记录 History.java： public class History { private String transactionId; private Date transactionDate; private String movieTitle; private BigDecimal schedulePrice; private String mallName; private i

我有
viewprofile
操作，显示用户的详细信息和交易历史记录

History.java
：

public class History {

    private String transactionId;
    private Date transactionDate;
    private String movieTitle;
    private BigDecimal schedulePrice;
    private String mallName;
    private int scheduleCinema;
    private Date scheduleDate;
    private Time scheduleTime;

    // getters and setters
}

public class ViewProfileAction extends ActionSupport implements SessionAware, RequestAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;
    private Map<String, Object> request;

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");       

        UserManager um = new UserManager();
        String registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        Date registeredDate = um.getRegisteredDate(currentUserId);
        int totalTransactions = um.getTotalTransactions(currentUserId);

        List<History> historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        request.put("registeredUserEmail", registeredUserEmail);
        request.put("registeredDate", registeredDate);
        request.put("totalTransactions", totalTransactions);
        request.put("historyList", historyList);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;     
    }   
}

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<body>
    <table class="displaytbl">
    <tr>
        <td class="maintitle" colspan="7">TRANSACTION HISTORY</td>
    </tr>
    <tr>
        <!-- column titles -->
    </tr>
    <c:choose>
        <c:when test="${historyList.isEmpty()}">
            <tr>
                <td class="norecord" colspan="7">NO RECORDED TRANSACTIONS</td>
            </tr>
        </c:when>

        <c:otherwise>
            <c:forEach var="history" items="historyList">
            <tr>
                <td>${history.transactionDate}</td>
                <td>${history.movieTitle}</td>
                <td>${history.schedulePrice}</td>
                <td>${history.mallName}</td>
                <td class="center">${history.scheduleCinema}</td>
                <td>${history.scheduleDate}</td>
                <td>${history.scheduleTime}</td>
            </tr>
            </c:forEach>
        </c:otherwise>
    </c:choose>
    </table>
</body>

<action name="viewprofile" class="com.mypackage.action.ViewProfileAction">
    <result>/user-profile.jsp</result>
    <result name="index" type="redirect">/index.jsp</result>
</action>

javax.el.PropertyNotFoundException: Property 'transactionDate' not found on type java.lang.String

ViewProfileAction.java
：

public class History {

    private String transactionId;
    private Date transactionDate;
    private String movieTitle;
    private BigDecimal schedulePrice;
    private String mallName;
    private int scheduleCinema;
    private Date scheduleDate;
    private Time scheduleTime;

    // getters and setters
}

public class ViewProfileAction extends ActionSupport implements SessionAware, RequestAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;
    private Map<String, Object> request;

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");       

        UserManager um = new UserManager();
        String registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        Date registeredDate = um.getRegisteredDate(currentUserId);
        int totalTransactions = um.getTotalTransactions(currentUserId);

        List<History> historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        request.put("registeredUserEmail", registeredUserEmail);
        request.put("registeredDate", registeredDate);
        request.put("totalTransactions", totalTransactions);
        request.put("historyList", historyList);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;     
    }   
}

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<body>
    <table class="displaytbl">
    <tr>
        <td class="maintitle" colspan="7">TRANSACTION HISTORY</td>
    </tr>
    <tr>
        <!-- column titles -->
    </tr>
    <c:choose>
        <c:when test="${historyList.isEmpty()}">
            <tr>
                <td class="norecord" colspan="7">NO RECORDED TRANSACTIONS</td>
            </tr>
        </c:when>

        <c:otherwise>
            <c:forEach var="history" items="historyList">
            <tr>
                <td>${history.transactionDate}</td>
                <td>${history.movieTitle}</td>
                <td>${history.schedulePrice}</td>
                <td>${history.mallName}</td>
                <td class="center">${history.scheduleCinema}</td>
                <td>${history.scheduleDate}</td>
                <td>${history.scheduleTime}</td>
            </tr>
            </c:forEach>
        </c:otherwise>
    </c:choose>
    </table>
</body>

<action name="viewprofile" class="com.mypackage.action.ViewProfileAction">
    <result>/user-profile.jsp</result>
    <result name="index" type="redirect">/index.jsp</result>
</action>

javax.el.PropertyNotFoundException: Property 'transactionDate' not found on type java.lang.String

struts.xml
：

public class History {

    private String transactionId;
    private Date transactionDate;
    private String movieTitle;
    private BigDecimal schedulePrice;
    private String mallName;
    private int scheduleCinema;
    private Date scheduleDate;
    private Time scheduleTime;

    // getters and setters
}

public class ViewProfileAction extends ActionSupport implements SessionAware, RequestAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;
    private Map<String, Object> request;

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");       

        UserManager um = new UserManager();
        String registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        Date registeredDate = um.getRegisteredDate(currentUserId);
        int totalTransactions = um.getTotalTransactions(currentUserId);

        List<History> historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        request.put("registeredUserEmail", registeredUserEmail);
        request.put("registeredDate", registeredDate);
        request.put("totalTransactions", totalTransactions);
        request.put("historyList", historyList);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;     
    }   
}

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<body>
    <table class="displaytbl">
    <tr>
        <td class="maintitle" colspan="7">TRANSACTION HISTORY</td>
    </tr>
    <tr>
        <!-- column titles -->
    </tr>
    <c:choose>
        <c:when test="${historyList.isEmpty()}">
            <tr>
                <td class="norecord" colspan="7">NO RECORDED TRANSACTIONS</td>
            </tr>
        </c:when>

        <c:otherwise>
            <c:forEach var="history" items="historyList">
            <tr>
                <td>${history.transactionDate}</td>
                <td>${history.movieTitle}</td>
                <td>${history.schedulePrice}</td>
                <td>${history.mallName}</td>
                <td class="center">${history.scheduleCinema}</td>
                <td>${history.scheduleDate}</td>
                <td>${history.scheduleTime}</td>
            </tr>
            </c:forEach>
        </c:otherwise>
    </c:choose>
    </table>
</body>

<action name="viewprofile" class="com.mypackage.action.ViewProfileAction">
    <result>/user-profile.jsp</result>
    <result name="index" type="redirect">/index.jsp</result>
</action>

javax.el.PropertyNotFoundException: Property 'transactionDate' not found on type java.lang.String
我不知道当我在
历史记录中确实有所述属性时，它为什么会抛出
属性NotFoundException
。如何解决这样的问题？
似乎是Jsp页面中下面一行的问题<代码>历史记录
将仅指向纯字符串
历史列表
，而不是您的集合对象

<c:forEach var="history" items="historyList">
上面的no where将在下面访问，您可能需要使用

在Jsp页面的下面一行似乎有问题<代码>历史记录将仅指向纯字符串
历史列表
，而不是您的集合对象

<c:forEach var="history" items="historyList">
上面的no where将在下面访问，您可能需要使用

您完全绕过了框架机制；不要使用
请求
，而是将私有属性与getter和setter一起使用：

public class ViewProfileAction extends ActionSupport implements SessionAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;

    private List<History> historyList;
    private String        registeredUserEmail;
    private Date          registeredDate;
    private int           totalTransactions;

    /* Generate GETTERS AND SETTERS for above fields here */

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");

        UserManager um = new UserManager();
        registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        registeredDate = um.getRegisteredDate(currentUserId);
        totalTransactions = um.getTotalTransactions(currentUserId);

        historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }    
}

public类ViewProfileAction扩展了ActionSupport实现了SessionAware{
私有静态最终长serialVersionUID=1L；
私人Map会议；
私人名单史学家；
私有字符串注册器；
私人日期登记日期；
私人交易；
/*在此处为上述字段生成getter和setter*/
@凌驾
公共字符串execute（）引发异常{
如果（！session.containsKey（“currentUserId”））{
return“index”；//如果未登录，则返回到index
}
String currentUserId=（String）session.get（“currentUserId”）；
UserManager um=newusermanager（）；
registeredUserEmail=um.getCurrentUserDetail（“用户电子邮件”，currentUserId）；
registeredDate=um.getRegisteredDate（currentUserId）；
totalTransactions=um.getTotalTransactions（currentUserId）；
historyList=新数据库操纵器（）.getTransactionHistory（currentUserId）；
回归成功；
}
@凌驾
公共无效设置会话（映射会话）{
this.session=会话；
}    
}
另外，避免使用JSPEL和减少JSTL和Struts2标记+OGNL的功能，这将是Struts2项目中的完美选择

会话中的用户检查可以在拦截器中执行一次，而无需在项目的每个操作中都进行检查；阅读如何操作。

您完全绕过了框架机制；不要使用
请求
，而是将私有属性与getter和setter一起使用：

public class ViewProfileAction extends ActionSupport implements SessionAware {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> session;

    private List<History> historyList;
    private String        registeredUserEmail;
    private Date          registeredDate;
    private int           totalTransactions;

    /* Generate GETTERS AND SETTERS for above fields here */

    @Override
    public String execute() throws Exception {      
        if(!session.containsKey("currentUserId")) {
            return "index"; // return to index if not logged in
        }

        String currentUserId = (String) session.get("currentUserId");

        UserManager um = new UserManager();
        registeredUserEmail = um.getCurrentUserDetail("user_email", currentUserId);
        registeredDate = um.getRegisteredDate(currentUserId);
        totalTransactions = um.getTotalTransactions(currentUserId);

        historyList = new DatabaseManipulator().getTransactionHistory(currentUserId);

        return SUCCESS;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }    
}

public类ViewProfileAction扩展了ActionSupport实现了SessionAware{
私有静态最终长serialVersionUID=1L；
私人Map会议；
私人名单史学家；
私有字符串注册器；
私人日期登记日期；
私人交易；
/*在此处为上述字段生成getter和setter*/
@凌驾
公共字符串execute（）引发异常{
如果（！session.containsKey（“currentUserId”））{
return“index”；//如果未登录，则返回到index
}
String currentUserId=（String）session.get（“currentUserId”）；
UserManager um=newusermanager（）；
registeredUserEmail=um.getCurrentUserDetail（“用户电子邮件”，currentUserId）；
registeredDate=um.getRegisteredDate（currentUserId）；
totalTransactions=um.getTotalTransactions（currentUserId）；
historyList=新数据库操纵器（）.getTransactionHistory（currentUserId）；
回归成功；
}
@凌驾
公共无效设置会话（映射会话）{
this.session=会话；
}    
}
另外，避免使用JSPEL和减少JSTL和Struts2标记+OGNL的功能，这将是Struts2项目中的完美选择

会话中的用户检查可以在拦截器中执行一次，而无需在项目的每个操作中都进行检查；阅读如何。

我已更改为
items=“${historyList}”
，现在可以使用了。我真傻。投票表决通过并被接受为答案。为我的错误感到抱歉。@ohtph这有时会发生。：）我已更改为
items=“${historyList}”
，现在可以使用了。我真傻。投票表决通过并被接受为答案。为我的错误感到抱歉。@ohtph这有时会发生。：）您好，这是否意味着如果我将
${}
更改为
，它将抵御XSS攻击？没错。如果你把它改成
，我的天啊，我得改变很多。哈哈哈。非常感谢Andrea，老实说，我不确定XSS到底是如何执行的，但我们的web项目将在国防/决赛日进行“XSS”测试。我现在就开始修改，谢谢你的提示。（顺便说一句，我对你的答案投了赞成票）你也应该在这个答案中获得其他建议：你现在正在使用Struts2框架的10%。：|P.S:如果你发现XSS的答案是有用的，请考虑它的投票，谢谢，这是否意味着如果我改变了我的<代码> ${} /代码>到<代码> <代码>它会阻止XSS攻击？如果你把它改成
，我的天啊，我得改变很多。哈哈哈。非常感谢Andrea，老实说，我不确定XSS到底是如何执行的，但我们的web项目将在国防/决赛日进行“XSS”测试。我现在就开始修改，谢谢你的提示。（顺便说一句，我对你的答案投了赞成票）你也应该在这个答案中获得其他建议：你现在正在使用Struts2框架的10%。：|P.S:如果你发现XSS的答案有用，请考虑投票，谢谢。