Eclipse EL-tag在tomcat 7中不与maven一起工作

调用jsp页面时不呈现EL标记。

打印${UploadeImage.value.getDocumentName（）}

我的pom文件是

<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/maven-v4_0_0.xsd">

<url>http://maven.apache.org</url>

UserDTO.java

public class UserDTO {
private int userId;
private String username;
private String message;
private long totalSize;
private Map<Integer,UserRepositryDTO> userRepositry;

/**
 * @return the totalSize
 */
public long getTotalSize() {
    return totalSize;
}
/**
 * @param totalSize the totalSize to set
 */
public void setTotalSize(long totalSize) {
    this.totalSize = totalSize;
}

/**
 * @return the userId
 */
public int getUserId() {
    return userId;
}
/**
 * @return the username
 */
public String getUsername() {
    return username;
}
/**
 * @return the message
 */
public String getMessage() {
    return message;
}
/**
 * @param userId the userId to set
 */
public void setUserId(final int userId) {
    this.userId = userId;
}
/**
 * @param username the username to set
 */
public void setUsername(final String username) {
    this.username = username;
}
/**
 * @param message the message to set
 */
public void setMessage(final String message) {
    this.message = message;
}
public Map<Integer,UserRepositryDTO> getUserRepositry() {
    return userRepositry;
}
public void setUserRepositry(Map<Integer,UserRepositryDTO> userRepositry) {
    this.userRepositry = userRepositry;
}
}

公共类UserDTO{
私有int用户id；
私有字符串用户名；
私有字符串消息；
私人长期总规模；
私有地图用户存储；
/**
*@返回总大小
*/
公共长getTotalize（）{
返回总大小；
}
/**
*@param totalSize要设置的totalSize
*/
公共void setTotalSize（长totalSize）{
this.totalSize=totalSize；
}
/**
*@返回用户ID
*/
public int getUserId（）{
返回用户标识；
}
/**
*@返回用户名
*/
公共字符串getUsername（）{
返回用户名；
}
/**
*@回信
*/
公共字符串getMessage（）{
返回消息；
}
/**
*@param userId要设置的用户标识
*/
public void setUserId（最终int userId）{
this.userId=userId；
}
/**
*@param username要设置的用户名
*/
public void setUsername（最终字符串用户名）{
this.username=用户名；
}
/**
*@param message要设置的消息
*/
公共无效设置消息（最终字符串消息）{
this.message=消息；
}
公共映射getUserRepositry（）{
返回用户存储；
}
public void setUserRepository（映射userRepository）{
this.userRepositry=userRepositry；
}
}

---

问题是由于servlet jsp jstl的不同版本造成的。我不知道正确的版本。

首先，不要使用

Scriptlets（）

获取循环的索引，您可以从

获取索引，您需要修复web.xml。它声明它使用Servlet2.3，这相当于不支持EL的JSP1.2

尝试使用以下类似的方法：

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="true">
</web-app>


您使用的EL无效。。请尝试
${uploadeImage.value.documentName}
这是有效的，因为getDocumentName是返回文档名称的函数。请在
getDocumentName（）中添加类。您在OP中添加的依赖项是有用的。。
<c:if test = "${not empty uploadedImages}">
<% int i = 0; %>
    <c:forEach var="uploadedImage" items="${uploadedImages}">
        <tr>
            <% i++; %>
            <td><%= i %></td>
            <td><c:out value="${uploadedImage.value.getDocumentName()}"/></td>
            <td><c:out value="${uploadedImage.value.getDocumentSize()}"/></td>
            <!-- <td><img src="image?id=${uploadedImage.value.getUserRepositryId()}" style = "height : 80px; width : 50px" alt = "image here"/></td>-->

            <td>
                <a href = "delete?id=${uploadedImage.value.getUserRepositryId()}"> Delete </a>
                <a href = "edit?id=${uploadedImage.value.getUserRepositryId()}"> Edit </a>
            </td>
        </tr>
    </c:forEach>
</c:if>

public class UserRepositryDTO {
private int userRepositryId;
private int userId;
private String documentName;
private long documentSize;

private byte[] document;
private String message;


/**
 * @return the message
 */
public String getMessage() {
    return message;
}
/**
 * @param message the message to set
 */
public void setMessage(String message) {
    this.message = message;
}
/**
 * @return the userRepositryId
 */
public int getUserRepositryId() {
    return userRepositryId;
}
/**
 * @return the userId
 */
public int getUserId() {
    return userId;
}
/**
 * @return the documentName
 */
public String getDocumentName() {
    return documentName;
}
/**
 * @return the documentSize
 */
public long getDocumentSize() {
    return documentSize;
}

/**
 * @return the document
 */
public byte[] getDocument() {
    return document;
}
/**
 * @param userRepositryId the userRepositryId to set
 */
public void setUserRepositryId(int userRepositryId) {
    this.userRepositryId = userRepositryId;
}
/**
 * @param userId the userId to set
 */
public void setUserId(int userId) {
    this.userId = userId;
}
/**
 * @param documentName the documentName to set
 */
public void setDocumentName(String documentName) {
    this.documentName = documentName;
}
/**
 * @param documentSize the documentSize to set
 */
public void setDocumentSize(long documentSize) {
    this.documentSize = documentSize;
}

/**
 * @param document the document to set
 */
public void setDocument(byte[] document) {
    this.document = document;
}
}

public class UserDTO {
private int userId;
private String username;
private String message;
private long totalSize;
private Map<Integer,UserRepositryDTO> userRepositry;

/**
 * @return the totalSize
 */
public long getTotalSize() {
    return totalSize;
}
/**
 * @param totalSize the totalSize to set
 */
public void setTotalSize(long totalSize) {
    this.totalSize = totalSize;
}

/**
 * @return the userId
 */
public int getUserId() {
    return userId;
}
/**
 * @return the username
 */
public String getUsername() {
    return username;
}
/**
 * @return the message
 */
public String getMessage() {
    return message;
}
/**
 * @param userId the userId to set
 */
public void setUserId(final int userId) {
    this.userId = userId;
}
/**
 * @param username the username to set
 */
public void setUsername(final String username) {
    this.username = username;
}
/**
 * @param message the message to set
 */
public void setMessage(final String message) {
    this.message = message;
}
public Map<Integer,UserRepositryDTO> getUserRepositry() {
    return userRepositry;
}
public void setUserRepositry(Map<Integer,UserRepositryDTO> userRepositry) {
    this.userRepositry = userRepositry;
}
}

req.setAttribute("uploadedImages", uploadedImages);

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

<c:choose>
  <c:when test="${not empty uploadedImages}">
    <c:forEach var="uploadedImage" items="${uploadedImages}" varStatus="status">
        <tr>
            <!--Her, don't use Scriptlets to get index, get index from <c:forEach varStatus -->
            <td>${status.index}</td> 
            <td><c:out value="${uploadedImage.value.documentName}"/></td>
            <td><c:out value="${uploadedImage.value.documentSize}"/></td>
            <!-- <td><img src="image?id=${uploadedImage.value.userRepositryId}" style = "height : 80px; width : 50px" alt = "image here"/></td>-->

            <td>
                <a href = "delete?id=${uploadedImage.value.userRepositryId}"> Delete </a>
                <a href = "edit?id=${uploadedImage.value.userRepositryId}"> Edit </a>
            </td>
        </tr>
    </c:forEach>
</c:when>
<c:otherwise>
   uploadedImages Map is empty..
</c:otherwise>
<c:choose>

${uploadedImage.value.documentName} <!--internally EL will invoke getDocumentName() to get documentName value-->

<c:out value="${uploadedImage.value.documentName}"/>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                             http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="true">
</web-app>