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IDEA JavaWeb项目启动运行后出现404错误的解决办法

人气:0

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 id="Tomcat" enabled="true" />
  <predefined_log_file id="Tomcat Catalina" enabled="true" />
  <predefined_log_file id="Tomcat Manager" enabled="false" />
  <predefined_log_file id="Tomcat Host Manager" enabled="false" />
  <predefined_log_file id="Tomcat Localhost Access" 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>
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