JFinal在controller中加入拦截器后Controller的继承类失效?报错
首先Controller的继承类BaseController重写render方法。
package com.myc.controller;
import com.jfinal.core.Controller;
public abstract class BaseController extends Controller {
protected static String root;
public String getroot() {
return root;
}
@Override
public void render(String view) {
if (root == null)
root = this.getRequest().getContextPath();
this.setAttr("base", root);
super.render(view);
}
}
然后所有controller都继承BaseController
package com.myc.controller.jfinal;
import com.myc.controller.BaseController;
import com.jfinal.ext.route.ControllerBind;
@ControllerBind(controllerKey = "/test")
public class TestController extends BaseController {
public void index() {
render("test/index");
}
}
没有加入拦截器，调试成功。
然后我加入了一个拦截器Flash。http://my.oschina.net/myaniu/blog/136340
package com.myc.controller.jfinal;
import com.jfinal.aop.Before;
import com.jfinal.ext.route.ControllerBind;
import com.jfinal.flash.Flash;
@ControllerBind(controllerKey = "/test")
@Before(Flash.class)
public class TestController extends BaseController {
public void index() {
render("test/index");
}
}
2015-08-18 17:11:34
[ERROR]-[Thread: http-8080-1]-[freemarker.log.Log4JLoggerFactory$Log4JLogger.error()]: Template processing error: "Expression base is undefined on line 8, column 3 in WEB-INF/template/test/index.html."
Expression base is undefined on line 8, column 3 in WEB-INF/template/test/index.html.
The problematic instruction:
----------
==> ${base} [on line 8, column 1 in WEB-INF/template/test/index.html]
----------
Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression base is undefined on line 8, column 3 in WEB-INF/template/test/index.html.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:125)
at freemarker.core.Expression.getStringValue(Expression.java:118)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.process(Environment.java:199)
at freemarker.template.Template.process(Template.java:259)
at com.jfinal.render.FreeMarkerRender.render(FreeMarkerRender.java:128)
at com.jfinal.core.ActionHandler.handle(ActionHandler.java:93)
at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
${base}
<br/>
Hello! JFinal
</body>
</html>
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https://developer.aliyun.com/profile/5yerqm5bn5yqg?spm=a2c6h.12873639.0.0.6eae304abcjaIB单步调试一下程序，看是否执行到了BaseController.render()方法内部，可能是import包弄错成别的jar包中的BaseController了，还有一种可能是因为在某处"base"这个变量被清掉了，如 setAttr("base",null)或removeAttr("base");单步调试发现是拦截器中的问题，已解决。
2020-06-12 14:29:35赞同 展开评论 打赏
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