java_web提示错误

来源：互联网发布：杰森伯恩知乎编辑：程序博客网时间：2024/06/15 16:07

错误1：
JSP页面顶端出现“红色”的报错信息：The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path
办法：右击web工程-》属性或Build Path-》Java Build Path->Libraries-> Add Libray…->Server Runtime -》Tomcat Server；
切换到Java Build Path界面中的Orader and Export，选择Tomcat。

错误2：
Build path specifies execution environment JavaSE-1.6. There are no JREs installed in the workspace that are strictly compatible with this environment.
办法:右键Build Path-》Configure Build Path-》Remove the “JRE System Library[J2SE 1.5]”-> click “Add Library” button -> JRE System Library-> select the new “Executin Environment” or Workspace default JRE

错误3：
The method toLocaleString() from the type Date is deprecated deal.jsp /3/WebContent line 16 JSP Problem
办法：因为toLocaleString()方法老了不建议用,可以换成SimpleDateFormat类的方法

错误4：打开eclipse中Run on Server时，却显示“此程序无法显示网页”？
办法：首先关闭当前的tomcat服务器，之后在tomcat安装目录下tomcat/bin/tomcat7.exe双击，手动重新打开。此时在浏览器输入http://localhost:8080会出现tomcat起始迎接页，说明服务器已成功打开。

错误5：Several ports (8005, 8080, 8009) required by Tomcat v7.0 Server at localhost are already in use.
办法：启动任务管理器，结束javaw.exe

错误6：不能在45s内启动。还有启动后一直没反应
办法：重启电脑。也可以双击tomcat/bin/shutdown.bat来关闭tomcat试试，不行就算。

错误7：The method getRealPath(String) from the type ServletRequest is deprecated
办法：换个新方法 getServletContext().getRealPath(“index.jsp”)

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