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
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 { } }
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
<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>
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持易盾网络。