67

我试图在我的 web 应用程序中使用 jsf 2 实现登录过滤器，遵循本指南：

https://stackoverflow.com/tags/servlet-filters/info

在我编译了我的过滤器并在“web-inf/classes”中添加了 .class 之后（如指南所说），过滤器工作了，但是我把错误的 url 重定向到登录页面，所以我从文件夹中删除了 filter.class (web-inf/classes) 并尝试再次编译该项目，但它失败了，从那时起我得到“包 javax.servlet 不存在”

这很奇怪，因为在它工作之前，我的 pom.xml 中有 javax.servlet .. 我尝试清理项目，但没有。

这是我的过滤器类：

package Bean;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Created with IntelliJ IDEA.
 * User: rodrigo
 * Date: 28-04-13
 * Time: 06:54 AM
 * To change this template use File | Settings | File Templates.
 */
@WebFilter("/Contenido/*")
public class filtro implements Filter {

    @Override
    public void init(FilterConfig config) throws ServletException {
        // If you have any <init-param> in web.xml, then you could get them
        // here by config.getInitParameter("name") and assign it as field.
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws ServletException, IOException {
        HttpServletRequest req = (HttpServletRequest) request;
        LoginBean user = (LoginBean) req.getSession().getAttribute("user");

        if (user != null && user.isLoggedIn()) {
            // User is logged in, so just continue request.
            chain.doFilter(request, response);
        } else {
            // User is not logged in, so redirect to index.
            HttpServletResponse res = (HttpServletResponse) response;
            res.sendRedirect(req.getContextPath() + "/Contenido/Login.xhtml");
        }
    }

    @Override
    public void destroy() {
        // If you have assigned any expensive resources as field of
        // this Filter class, then you could clean/close them here.
    }
}

这是错误：

\Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[5,20] error: package javax.servlet does not exist
[ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[6,20] error: package javax.servlet does not exist
[ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[7,20] error: package javax.servlet does not exist
[ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[8,20] error: package javax.servlet does not exist
[ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[9,20] error: package javax.servlet does not exist
[ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[10,20] error: package javax.servlet does not exist
[ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[11,31] error: package javax.servlet.annotation does not exist

我的 pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>Frutemu</groupId>
    <artifactId>Frutemu</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Frutemu Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <repositories>
        <repository>
            <id>prime-repo</id>
            <name>Prime Repo</name>
            <url>http://repository.primefaces.org</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.ejb</groupId>
            <artifactId>ejb-api</artifactId>
            <version>3.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>3.5</version>
        </dependency>
        <dependency>
            <groupId>org.primefaces.themes</groupId>
            <artifactId>all-themes</artifactId>
            <version>1.0.9</version>
        </dependency>
        <dependency>
            <groupId>javax.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.0.2-b10</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- MySQL database driver -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>el-impl</artifactId>
            <version>2.2.1-b04</version>
            <scope>provided</scope>
        </dependency>
        <!-- OpenJPA framework -->
        <dependency>
            <groupId>org.apache.openjpa</groupId>
            <artifactId>openjpa-all</artifactId>
            <version>2.2.0</version>
        </dependency>
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>sqljdbc4</artifactId>
            <version>4.0</version>
        </dependency>
        <dependency>
            <groupId>net.sf.jasperreports</groupId>
            <artifactId>jasperreports</artifactId>
            <version>4.1.2</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>Frutemu</finalName>
        <plugins>
            <!-- Open Jpa -->
            <plugin>
                <groupId>org.apache.openjpa</groupId>
                <artifactId>openjpa-maven-plugin</artifactId>
                <version>2.2.0</version>
                <configuration>
                    <includes>**/model/*.class</includes>
                    <addDefaultConstructor>true</addDefaultConstructor>
                    <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
                </configuration>
                <executions>
                    <execution>
                        <id>enhancer</id>
                        <phase>process-classes</phase>
                        <goals>
                            <goal>enhance</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <!-- Plugin para levantar una instancia de Tomcat 7 liviana, única para este proyecto -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.0</version>
                <configuration>
                    <url>http://127.0.0.1:8080/manager/text</url>
                    <server>TomcatServer</server>
                    <path>/Frutemu</path>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>jasperreports-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile-reports</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>
                    <!--note this must be repeated here to pick up correct xml validation -->
                    <dependency>
                        <groupId>net.sf.jasperreports</groupId>
                        <artifactId>jasperreports</artifactId>
                        <version>4.1.2</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>
4

7 回答 7

133

您的 pom.xml 中缺少 javax.servlet 依赖项。将以下内容添加到依赖项节点：

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
于 2013-04-28T13:49:24.767 回答
5

我只将此代码放在我的 pom.xml 中，并执行了命令 maven install。

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
于 2014-07-26T00:04:07.633 回答
1

@Matthias Herlitzius 提供的答案大部分是正确的。只是为了进一步清楚。

servlet-api jar 最好留给服务器管理，详情请参阅此处

话虽如此，要添加的依赖项可能会根据您的服务器/容器而有所不同。例如在 Wildfly 中，依赖项是

<dependency>
    <groupId>org.jboss.spec.javax.servlet</groupId>
    <artifactId>jboss-servlet-api_3.1_spec</artifactId>
    <scope>provided</scope>
</dependency>

所以要小心检查你的容器是如何提供 servlet 实现的。

于 2016-05-08T12:19:45.207 回答
1

我还需要导入 javaee-api。

  <dependency>
     <groupId>javax</groupId>
     <artifactId>javaee-api</artifactId>
     <version>7.0</version>
  </dependency>

除非我收到以下错误：

package javax.servlet.http does not exist
javax.servlet.annotation does not exist
javax.servlet.http does not exist
...
于 2017-10-05T06:48:19.683 回答
0

在我的例子中，将 Spring 3.1 应用程序迁移到 3.2.7，我的解决方案与 Matthias 的类似，但有点不同——因此我在这里记录它：

在我的 POM 中，我发现了这种依赖关系并将其从 6.0 更改为 7.0：

    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>

后来在 POM 中，我将此插件从 6.0 升级到 7.0：

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.1</version>
            <executions>
                <execution>
                    ...
                    <configuration>
                        ...
                        <artifactItems>
                            <artifactItem>
                                <groupId>javax</groupId>
                                <artifactId>javaee-endorsed-api</artifactId>
                                <version>7.0</version>
                                <type>jar</type>
                            </artifactItem>
                        </artifactItems>
                    </configuration>
                </execution>
            </executions>
        </plugin>
于 2015-04-23T21:42:39.227 回答
0

我的 Gradle 版本遇到了类似的问题，并以类似的方式修复了它：

Unable to load class hudson.model.User due to missing dependency javax/servlet/ServletException

固定：

dependencies {
   implementation('javax.servlet:javax.servlet-api:3.0.1')
}
于 2021-02-19T10:04:14.170 回答
-5

也许不存在 javaee-api-7.0.jar。 下载这个 jar 并在你的项目上右击

  1. 在您的项目上右键单击
  2. 构建路径
  3. 配置构建路径
  4. 添加外部罐子
  5. javaee-api-7.0.jar 选择
  6. 申请并完成
于 2017-03-06T21:08:16.327 回答