Question

我有速度模板，一些将模板和POJO合并到文本中的方法。我检查了调试器，所有数据都在正确填充。我的问题是速度只能获得一个字段（queueName），但其余的不能。那是为什么？

模板：

<html>
    <body>
        <h3>Environment: ${environment}</h3>

        <div>
            #if ($monitoredQueues.size() > 0)
            <table>
                #foreach( $monitoredQueue in $monitoredQueues )
                #set( $queueName = ${monitoredQueue.QueueName})
                #set( $crMsgCount = ${monitoredQueue.CurrentMessagesCount})
                #set( $prMsgCount = ${monitoredQueue.PreviousMessagesCount})
                #set( $prCheckTime = ${monitoredQueue.PreviousCheckTime})
                #set( $prEmailTime = ${monitoredQueue.PreviousEmailSentTime})
                <tr>
                    <td>
                        <table>
                            <tr>
                                <td>
                                    <p>Queue name: ${queueName}</p>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    <p>Current messages count: ${crMsgCount}</p>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    <p>Previous messages count: $!{prMsgCount}</p>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    <p>Previous check time: $!{prCheckTime}</p>
                                </td>
                            </tr>
                            <tr>
                                <td>
                                    <p>Previous email sent time: $!{prEmailTime}</p>
                                </td>
                            </tr>
                        </table>
                    </td>
                </tr>
                #end
            </table>
            #end
        </div>
    </body>
</html>

这是我的POJO

@Data //lombok annotation generates getters, setters, hash and equals
@Builder //lombok annotation generates builder
@NoArgsConstructor
@AllArgsConstructor
public class MonitoredQueue {

    private Integer id;
    private String queueName;
    private Integer currentMessageCount;
    private Integer previousMessageCount;
    private LocalDateTime previousCheckDate;
    private LocalDateTime previousEmailSentDate;
    private String createdBy;
    private LocalDateTime creationDate;
    private String modifiedBy;
    private LocalDateTime modificationDate;
}

合并方法

public String mergeTemplateIntoEmailText(List<MonitoredQueue> monitoredQueues, String environment) {
        velocityEngine.init();
        Template mailTemplate = velocityEngine.getTemplate(EMAIL_TEMPLATE);
        VelocityContext velocityContext = new VelocityContext();
        velocityContext.put(ENVIRONMENT, environment);
        velocityContext.put(MONITORED_QUEUE, monitoredQueues);
        StringWriter writer = new StringWriter();
        mailTemplate.merge(velocityContext, writer);
        return writer.toString();
    }

这就是结果：

Environment: test

Queue name: XXXX Current messages count: $crMsgCount Previous messages count: $prMsgCount Previous check time: $prCheckTime Previous email sent time: $prEmailTime

我通过更改模板解决了我的问题。速度某种程度上在html树的深层某处松散了上下文。不知道为什么。

Answer 1

确保您的POJO类为public。如果您的POJO不公开：

@Data
@AllArgsConstructor
class Foo {
    private String bar;
    private String baz;
}

然后：

Foo foo = new Foo();
foo.setBar("lorem");
foo.setBaz("ipsum");

Template template = VELOCITY_ENGINE.getTemplate("/templates/sample.vm", UTF_8.name());
VelocityContext context = new VelocityContext(ImmutableMap.<String, Object>of("foo", foo));
StringWriter writer = new StringWriter();
template.merge(context, writer);

不会分别用${foo.bar}和${foo.baz}代替lorem和ipsum的值。

一旦我将Foo设为public类，速度就可以毫无问题地呈现其属性。

Answer 2

Velocity无法读取私有字段。你需要添加公共吸气剂。

速度不能从pojo中恢复场

2 个答案: