Question

在编译JSP模板期间，我得到以下异常：

getFriendImage（）不是方法

我尝试过重建课程，但没有结果。 src中的项目是指向运行正常的图像的链接。

package classes;

public class Friends {

  private String username;
  private String friendname;
  private String complete;
  private String datestring;
  private String user_image;
  private String friendImage;
  private String online;

  public Friends(String username, String friendname, String complete, 
                 String datestring, String user_image, 
                 String friendImage, String online) {
    this.username = username;
    this.friendname = friendname;
    this.complete = complete;
    this.datestring = datestring;
    this.user_image = user_image;
    this.friendImage = friendImage;
    this.online = online;
  }

  public String getUsername() {
    return username;
  }

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

  public String getFriendname() {
    return friendname;
  }

  public void setFriendname(String friendname) {
    this.friendname = friendname;
  }

  public String getComplete() {
    return complete;
  }

  public void setComplete(String complete) {
    this.complete = complete;
  }

  public String getDatestring() {
    return datestring;
  }

  public void setDatestring(String datestring) {
    this.datestring = datestring;
  }

  public String getUser_image() {
    return user_image;
  }

  public void setUser_image(String user_image) {
    this.user_image = user_image;
  }

  public String getFriendImage() {
    return friendImage;
  }

  public void setFriendImage(String friendImage) {
    this.friendImage = friendImage;
  }

  public String getOnline() {
    return online;
  }

  public void setOnline(String online) {
    this.online = online;
  }
}

 session.setAttribute("friendsList", friendsList);

JSP模板

<ul id="friends_list">
    <c:forEach var="item" items="${friendsList}">
        <li class="friend_item"><img class="friend_list_image" 
            src="${friendsList.getFriendImage()}"  
            alt="friend_image"/>
            <label>${friendsList.getFriendname()}</label>
            <img class="message_icon" src="Images/Message.png" 
                 alt="Message_Icon" title="Message" onclick="message_friend()"/>
        </li>
    </c:forEach>
</ul>

Answer 1

您可能希望访问Merging result:SUCCESS Merged manifest saved to /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/intermediates/bundles/release/AndroidManifest.xml :react-native-config:processReleaseManifest (Thread[main,5,main]) completed. Took 0.116 secs. :react-native-config:processReleaseResources (Thread[main,5,main]) started. :react-native-config:processReleaseResources Executing task ':react-native-config:processReleaseResources' (up-to-date check took 0.016 secs) due to: Output file /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/intermediates/incremental/processReleaseResources has changed. Output file /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/generated/source/r/release has changed. Output file /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/generated/source/r/release/com has been removed. All input files are considered out-of-date for incremental task ':react-native-config:processReleaseResources'. Starting process 'command '/home/paneladm/Android-sdk/build-tools/23.0.1/aapt''. Working directory: /home/paneladm/my-react-native-app/node_modules/react-native-config/android Command: /home/paneladm/Android-sdk/build-tools/23.0.1/aapt package -f --no-crunch -I /home/paneladm/Android-sdk/platforms/android-23/android.jar -M /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/intermediates/manifests/aapt/release/AndroidManifest.xml -S /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/intermediates/res/merged/release -m -J /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/generated/source/r/release --custom-package com.lugg.ReactNativeConfig --non-constant-id -0 apk --output-text-symbols /home/paneladm/my-react-native-app/node_modules/react-native-config/android/build/intermediates/bundles/release --no-version-vectors :react-native-config:processReleaseResources FAILED :react-native-config:processReleaseResources (Thread[main,5,main]) completed. Took 0.123 secs. FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':react-native-config:processReleaseResources'. > com.android.ide.common.process.ProcessException: Failed to execute aapt项目上的getFriendImage()而不是整个列表。如果是这样，您应该像这样访问它

Friend

同样适用于应该

的

src="${item.getFriendImage()}"

label

此外，你不应该以复数形式调用班级<label>${item.getFriendname()}</label>。使用Friends构建一个新的（单个）朋友是非常误导的，所以单数new Friends()很好。

Answer 2

你通常不应该像那样访问那些方法。通常你应该做的只是使用你在Friends类中声明的字段名称来访问它们，前提是你事先设置了这些变量。

此外，如果您在<c:forEach中提供${item.somefieldname}，则应使用<ul id="friends_list"> <c:forEach var="item" items="${friendsList}"> <li class="friend_item"> <img class="friend_list_image" src="${item.friendImage}" alt="friend_image"/> <label>${item.friendname}</label> <img class="message_icon" src="Images/Message.png" alt="Message_Icon" title="Message" onclick="message_friend()"/> </li> </c:forEach> </ul>

访问它们

  private String username;
  private String friendname;
  private String complete;
  private String datestring;
  private String user_image;
  private String friendImage; //capitalized here, be careful!
  private String online;

还要注意大写：

{{1}}

javax.el.MethodNotFoundException：找不到方法：JSP

2 个答案: