FileNotFound在java中加载freemarker模板时的异常

eclipse java freemarker filenotfoundexception

2022-09-03 17:29:57

我在加载自由标记模板时收到一个文件未找到异常，即使该模板实际上存在于路径中。

更新：这是作为 Web 服务运行的。它将根据搜索查询向客户端返回一个 xml。当我从另一个java程序（从静态main）调用它时，模板成功加载。但是，当客户端请求 xml 时，FileNotFoundException 就会发生。

操作系统：Windows 7 绝对文件路径：C：/Users/Jay/workspace/WebService/templates/

这是我的代码：

private String templatizeQuestion(QuestionResponse qr) throws Exception
{
    SimpleHash context = new SimpleHash();
    Configuration config = new Configuration();

    StringWriter out = new StringWriter();

    Template _template = null;

    if(condition1)
    {           
        _template = config.getTemplate("/templates/fibplain.xml");
    } 
    else if(condition2)
    {
        _template = config.getTemplate("/templates/mcq.xml");
    }
    context.put("questionResponse", qr);
    _template.process(context, out);

    return out.toString();
 }

完整错误堆栈：

 java.io.FileNotFoundException: Template /templates/fibplain.xml not found.
at freemarker.template.Configuration.getTemplate(Configuration.java:495)
at freemarker.template.Configuration.getTemplate(Configuration.java:458)
at com.hm.newAge.services.Curriculum.templatizeQuestion(Curriculum.java:251)
at com.hm.newAge.services.Curriculum.processQuestion(Curriculum.java:228)
at com.hm.newAge.services.Curriculum.processQuestionList(Curriculum.java:210)
at com.hm.newAge.services.Curriculum.getTest(Curriculum.java:122)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)

答案 1

FreeMarker 模板路径由对象解析，您应该在对象中指定该对象。指定为模板路径的路径由解释，并且通常相对于某种基目录（即使它以开头），由于这个原因，也称为模板根目录。在您的示例中，您没有指定任何，因此您使用的是默认的，它只是为了向后兼容，并且几乎无用（而且也很危险）。因此，请执行如下操作：TemplateLoaderConfigurationTemplateLoader/TemplateLoaderTemplateLoader

config.setDirectoryForTemplateLoading(new File(
    "C:/Users/Jay/workspace/WebService/templates"));

然后：

config.getTemplate("fibplain.xml");

请注意，前缀现在不存在，因为模板路径是相对于的。（这也意味着模板不能使用 -s 退出它，这对安全性很重要。/templateC:/Users/Jay/workspace/WebService/templates../

除了从实际目录加载之外，您还可以从、从“类路径”等加载模板。这完全取决于您的选择。SerlvetContextTemplateLoader

另请参见：http://freemarker.org/docs/pgui_config_templateloading.html

更新：如果您得到而不是，是时候将FreeMarker升级到至少2.3.22了。它还提供了更好的错误消息，例如，如果您犯了使用默认值的典型错误，它会在错误消息中告诉您。减少开发人员时间的浪费。FileNotFoundExceptionTemplateNotFoundExceptionTemplateLoader

答案 2

你可以像那样解决这个问题。

public class HelloWorldFreeMarkerStyle {
    public static void main(String[] args) {

         Configuration configuration = new Configuration();

         configuration.setClassForTemplateLoading(HelloWorldFreeMarkerStyle.class, "/");



        FileTemplateLoader templateLoader = new FileTemplateLoader(new File("resources"));
        configuration.setTemplateLoader(templateLoader);

        Template helloTemp= configuration.getTemplate("hello.ftl");
        StringWriter writer = new StringWriter();
        Map<String,Object> helloMap = new HashMap<String,Object>();
        helloMap.put("name","gokhan");

        helloTemp.process(helloMap,writer);

        System.out.println(writer);


    }   
}