首页 > 开发 > Java > 正文

IDEA JavaWeb项目启动运行后出现404错误的解决方法

2020-07-28 13:50:50
字体:
来源:转载
供稿:网友

404这个错误真的是一言难尽!不过大多是配置文件出错,认真修改还是可以的

1.web.xml配置错误:

默认首页没有写的,在web.xml添加一个就行(前提是你有jsp页面,名字不要写错):
比如这个:

<welcome-file-list> <welcome-file>Login.jsp</welcome-file> </welcome-file-list>

2.IDEA JavaWeb项目运行找不到对应Servlet映射的JSP页面

在servlet3.0以后提供了注解配置,这样就不需要在web.xml中配置。使用IDEA生成的servlet文件的注解配置如下(第一行):

@WebServlet(value = "/AdminServlet")public class AdminServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }}

在这里插入图片描述

对于怎样配置请看:

路径:File > Settings > Editor > File and Code Templates > Other > Web > Java code templates 下第二个点开右边编辑模板
如下(这是我的模板):

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end#parse("File Header.java")@javax.servlet.annotation.WebServlet(value = "/${Entity_Name}")public class ${Class_Name} extends javax.servlet.http.HttpServlet { protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException {   doPost(request,response);  } protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException { } }

3.创建了一个和以前项目名称相同的项目(项目名称结构一样),把以前的覆盖了 然后运行就404了;

第一时间想到的就是配置文件有错就开始找 :这个是我刚发现的解决办法:

启动运行后跳转的页面发现不是你定义的页面报404错误,这就需要你在workspace.xml里面找了:

你的项目名 > .idea > workspace.xml,找到里面不是你首次跳转的jsp的名字,修改为你定义的jsp名字

具体在这里:把名字修改一下就好了

在这里插入图片描述

 <component name="RunManager"> <configuration name="tomcat" type="#com.intellij.j2ee.web.tomcat.TomcatRunConfigurationFactory" factoryName="Local" APPLICATION_SERVER_NAME="Tomcat 7.0.47" ALTERNATIVE_JRE_ENABLED="true" ALTERNATIVE_JRE_PATH="C:/Program Files/Java/jdk1.8.0_191/jre">  <option name="OPEN_IN_BROWSER_URL" value="http://localhost:8080/Login.jsp" />  <option name="UPDATING_POLICY" value="restart-server" />  <deployment>  <artifact name="SuShe:war exploded">   <settings>   <option name="CONTEXT_PATH" value="/" />   </settings>  </artifact>  </deployment>  <server-settings>  <option name="BASE_DIRECTORY_NAME" value="Login_jsp_SuShe" />  </server-settings>  <predefined_log_file  enabled="true" />  <predefined_log_file  enabled="true" />  <predefined_log_file  enabled="false" />  <predefined_log_file  enabled="false" />  <predefined_log_file  enabled="false" />  <RunnerSettings RunnerId="Debug">  <option name="DEBUG_PORT" value="61238" />  </RunnerSettings>  <ConfigurationWrapper VM_VAR="JAVA_OPTS" RunnerId="Cover">  <option name="USE_ENV_VARIABLES" value="true" />  <STARTUP>   <option name="USE_DEFAULT" value="true" />   <option name="SCRIPT" value="" />   <option name="VM_PARAMETERS" value="" />   <option name="PROGRAM_PARAMETERS" value="" />  </STARTUP>  <SHUTDOWN>   <option name="USE_DEFAULT" value="true" />   <option name="SCRIPT" value="" />   <option name="VM_PARAMETERS" value="" />   <option name="PROGRAM_PARAMETERS" value="" />  </SHUTDOWN>  </ConfigurationWrapper>  <ConfigurationWrapper VM_VAR="JAVA_OPTS" RunnerId="Debug">  <option name="USE_ENV_VARIABLES" value="true" />  <STARTUP>   <option name="USE_DEFAULT" value="true" />   <option name="SCRIPT" value="" />   <option name="VM_PARAMETERS" value="" />   <option name="PROGRAM_PARAMETERS" value="" />  </STARTUP>  <SHUTDOWN>   <option name="USE_DEFAULT" value="true" />   <option name="SCRIPT" value="" />   <option name="VM_PARAMETERS" value="" />   <option name="PROGRAM_PARAMETERS" value="" />  </SHUTDOWN>  </ConfigurationWrapper>  <ConfigurationWrapper VM_VAR="JAVA_OPTS" RunnerId="Run">  <option name="USE_ENV_VARIABLES" value="true" />  <STARTUP>   <option name="USE_DEFAULT" value="true" />   <option name="SCRIPT" value="" />   <option name="VM_PARAMETERS" value="" />   <option name="PROGRAM_PARAMETERS" value="" />  </STARTUP>  <SHUTDOWN>   <option name="USE_DEFAULT" value="true" />   <option name="SCRIPT" value="" />   <option name="VM_PARAMETERS" value="" />   <option name="PROGRAM_PARAMETERS" value="" />  </SHUTDOWN>  </ConfigurationWrapper>  <method v="2">  <option name="BuildArtifacts" enabled="true">   <artifact name="SuShe:war exploded" />  </option>  </method> </configuration> </component>
发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表