在属性键下找不到bean（struts 1.3.10）

时间：2015-12-04 11:35:52

标签： struts-1

尝试提交表单时出现以下错误：

"javax.servlet.ServletException: javax.servlet.jsp.JspException: No bean found under attribute key user"

这些是我的文件：

的pom.xml 

<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>com.struts1</groupId>
  <artifactId>struts1</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.4</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts-core</artifactId>
            <version>1.3.10</version>
        </dependency>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts-taglib</artifactId>
            <version>1.3.10</version>
        </dependency>
    </dependencies>
</project>

的web.xml 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>struts1</display-name>
<welcome-file-list>
  <welcome-file>index.html</welcome-file>
  <welcome-file>index.htm</welcome-file>
  <welcome-file>index.jsp</welcome-file>
  <welcome-file>default.html</welcome-file>
  <welcome-file>default.htm</welcome-file>
  <welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>
    org.apache.struts.action.ActionServlet
  </servlet-class>
  <init-param>
    <param-name>config</param-name>
    <param-value>
       /WEB-INF/struts-config.xml
    </param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>

的struts-config.xml 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" 
    "http://struts.apache.org/dtds/struts-config_1_3.dtd">
<struts-config>
  <form-beans>
    <form-bean name="user" type="com.struts1.domain.User" />
  </form-beans>
  <action-mappings>
      <action name="user" path="/userInteraction" scope="request" type="com.struts1.controller.UserInteraction" input="/index.jsp">
        <forward name="success" path="/user.jsp" redirect="true" />
      </action>
  </action-mappings>
</struts-config>

的index.jsp 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<%@taglib uri="http://struts.apache.org/tags-logic" prefix="logic"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Main Page</title>
</head>
<body>
    <html:form action="/userInteraction.do">
        <html:submit value="Send" />
    </html:form>
</body>

user.jsp 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://struts.apache.org/tags-logic" prefix="logic"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
  <h1>Hello user!</h1>
  <logic:equal name="user" property="firstName" value="evgheni" scope="request">
        User Logged In
  </logic:equal>
  </body>
</html>

UserInteraction.java （操作类）

package com.struts1.controller;

import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.struts1.domain.User;
import com.struts1.persistance.UserDAOImpl;
import com.struts1.persistanceI.UserDAO;

public class UserInteraction extends Action{
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) throws Exception{
    UserDAO userDAO = new UserDAOImpl();
    request.setAttribute("user", userDAO.getUser(1));
    return mapping.findForward("success");
}

}

User.java 

package com.struts1.domain;

import org.apache.struts.action.ActionForm;

public class User extends ActionForm{
    private String firstName;
    private String lastName;
    private int id;

    public User(String firstName, String lastName, int id) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.id = id;
    }

    public User() {
        super();
    }
    // getters and setter go here
}
  

userDAO.getUser(1)通过其ID从DB返回用户。   表单提交后会出现javax.servlet.ServletException错误。

我正在使用tomcat7容器和Java 8。

1 个答案:

答案 0 :(得分：2)

如异常所示，在属性键“user”下找不到bean，因此我们感兴趣的区域是struts-config文件中的映射。我可以看到你在<action>和<form-bean>之间有一个正确的映射，但是当第一个请求被发送到Action类时，有一个转发将我们带到user.jsp但是有重定向到user.jsp，这意味着客户端将为user.jsp生成一个新请求，因此请求参数将在此过程中丢失。

有关转发与重定向的详细信息，请参阅此link。

只需删除转发映射中的重定向属性，您的代码就可以正常工作。

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