java - 当我点击 with params I have a Unexpected exception in class ActionSupport in Struts2 时

Question

简介

对于我的 IT 大学的一个项目，我必须在 Strut2 应用程序中创建排雷游戏。对于服务器端，我使用 Tomcat。

您可以看到目前游戏的样子:

当我点击一个框时，我们必须看到一个数字或一个地雷。为此，案例有两个参数(X 和 Y)，用于更新单击框的状态。为了使一个框可点击，我使用代码:

<a href="
    <s:url action='demineur' method="connexion">
       <s:param name="x" value="#x.index"/>
       <s:param name="y" value="#y.index"/>
    </s:url>
">

当我们想玩这个游戏时，我们必须输入用户名:

当我们登录游戏时，我们有一个以玩家名称创建的 session ，并且在 session 中我们有游戏的保存。

当我们与游戏交互时，游戏的保存就会更新

使用老师提供的 API (ModeleDemineur:1.1) 创建地雷，并显示如下:

demineur.jsp

    <table>
    <s:iterator status="x" var="ligne" value="cases">
        <tr>
        <s:iterator status="y" var="case" value="ligne">
            <td>
            <s:if test="getCachee()">
                <a href="
                    <s:url action='demineur' method="connexion">
                        <s:param name="x" value="#x.index"/>
                        <s:param name="y" value="#y.index"/>
                    </s:url>
                ">

                    <img src="${pageContext.request.contextPath}/img/cellCovered.png"/>
                </a>
            </s:if>
            <s:else>
                <s:if test="getValeur() == -1">
                    <img src="${pageContext.request.contextPath}/img/mineExploded.png"/>
                </s:if>
                <img src="${pageContext.request.contextPath}/img/box<s:property value='getValeur()'/>.png"/>
            </s:else>
            </td>
        </s:iterator>
        </tr>
    </s:iterator>
    </table>

ActionDemineur.java

public class ActionDemineur extends ActionSupport implements SessionAware {

    String username;
    GestionDemineur demineur;
    Plateau plateau;
    Case[][] cases;
    String val;
    String x,y;

    private Map<String, Object> session;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public GestionDemineur getDemineur() {
        return demineur;
    }

    public void setDemineur(GestionDemineur demineur) {
        this.demineur = demineur;
    }

    public Plateau getPlateau() {
        return plateau;
    }

    public void setPlateau(Plateau plateau) {
        this.plateau = plateau;
    }

    public Case[][] getCases() {
        return cases;
    }

    public void setCases(Case[][] cases) {
        this.cases = cases;
    }

    public String getVal() {
        return val;
    }

    public void setVal(String val) {
        this.val = val;
    }

    public String getX() {
        return x;
    }

    public void setX(String x) {
        this.x = x;
    }

    public String getY() {
        return y;
    }

    public void setY(String y) {
        this.y = y;
    }

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

    public Map<String, Object> getSession() {
        return session;
    }

    public String connexion() throws ExceptionLoginDejaPris {
        if(!session.containsKey("user"))
        {
            if(username != null)
            {
                session.put("user", username);
            }
            else {
                return INPUT;
            }
        }

        if(!session.containsKey("plateau")) {
            System.err.println("plateau not found");
            demineur = new GestionDemineur();
            demineur.connexion(username);
            plateau = demineur.getPlateau(username);
            cases = plateau.getMonPlateau();
            session.put("plateau", plateau);
            session.put("user", username);
        }

        username = (String) session.get("user");
        plateau = (Plateau) session.get("plateau");
        cases = plateau.getMonPlateau();
        System.err.println(plateau);

        if(x != null && y != null)
        {
            System.err.println("x and y not null");
            System.err.println(Integer.parseInt(x) + " -- " + Integer.parseInt(y));
            try {
                plateau.decouvrirCase(Integer.parseInt(x), Integer.parseInt(y));
            } catch (BombeException e) {
                session.remove("plateau", plateau);
                session.remove("user", username);
                return "perdu";
            }
            System.err.println(plateau.getMonPlateau()[Integer.parseInt(x)][Integer.parseInt(y)]);

        }
        return SUCCESS;
    }

}

Struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
    <constant name="struts.devMode" value="true" />
    <constant name="struts.enable.DynamicMethodInvocation" value="false"/>

    <package name="/" extends="struts-default">

        [...]

        <action name="demineur" class="struts.ActionDemineur" method="connexion">
            <result name="input">/WEB-INF/pages/connexionDemineur.jsp</result>
            <result name="success">/WEB-INF/pages/demineur.jsp</result>
            <result name="perdu">/WEB-INF/pages/perduDemineur.jsp</result>
        </action>
    </package>

</struts>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>fr.univ-orleans.ufrst.info.l3.pnt</groupId>
    <artifactId>HelloStruts2</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>2.5.22</version>
        </dependency>

        [...]

        <dependency>
            <groupId>fr.miage.orleans.tp</groupId>
            <artifactId>ModeleDemineur</artifactId>
            <version>1.1</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>13</source>
                    <target>13</target>
                    <encoding>UTF-8</encoding>
                </configuration>
                <version>3.8.1</version>
            </plugin>

            <plugin>
                <groupId>org.eclipse.jetty</groupId>
                <artifactId>jetty-maven-plugin</artifactId>
                <version>9.4.25.v20191220</version>
            </plugin>
        </plugins>
    </build>

    <properties>
        <maven.compiler.source>13</maven.compiler.source>
        <maven.compiler.target>13</maven.compiler.target>
    </properties>
</project>

错误

ERROR ParametersInterceptor Developer Notification (set struts.devMode to false to disable this message):
Unexpected Exception caught setting 'x' on 'class com.opensymphony.xwork2.ActionSupport: Error setting expression 'x' with value ['0', ]
ERROR ParametersInterceptor Developer Notification (set struts.devMode to false to disable this message):
Unexpected Exception caught setting 'y' on 'class com.opensymphony.xwork2.ActionSupport: Error setting expression 'y' with value ['4', ]

我的论文

我尝试在 struts.xml 中添加行 xml <interceptor-ref name=params />但他删除了 session 中包含游戏保存和当前用户名的数据。

感谢您今后的帮助

Answer 1

我找到了答案!

我添加了一个参数方法，但这是一个真正的错误!

<s:url var="demineurURL" action='demineur'>
    <s:param name="x" value="#x.index"/>
    <s:param name="y" value="#y.index"/>
</s:url>

<s:a href="%{demineurURL}">
    <img src="${pageContext.request.contextPath}/img/cellCovered.png"/>
</s:a>