Question

我正在使用servlet 3.1创建一个Web应用程序。现在我需要定义一个自定义404页面。这就是我的方式：

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
    id="WebApp_ID" version="3.1">
    <display-name>CafeSkeleton</display-name>
    <servlet>
        <servlet-name>CafeSkeleton</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>ru.tenet.cafeservice</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>CafeSkeleton</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
    <error-page>
        <error-code>404</error-code>
        <location>/404.html</location>
    </error-page>
</web-app>

我的小servlet方法：

@Override
protected void doGet(HttpServletRequest request,
        HttpServletResponse response) {
    OutputStream out = null;
    try {
        byte[] bytes;
        if (request.getHeader("User-Agent").contains("mobile")) {
            bytes = viewService.getViewBytes("mobile.html");
        } else {
            bytes = viewService.getViewBytes("desktop.html");
        }
        if (bytes == null) {
            //this condition is true
            response.setStatus(404);
        } else {
            out = response.getOutputStream();
            out.write(bytes);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (out != null)
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
    }

此外，我在WebContent文件夹中有一个自定义的404.html：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>404</title>
</head>
<body>404 Not found
</body>
</html>

这是我的项目结构：

和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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>CafeSkeleton</groupId>
    <artifactId>CafeSkeleton</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <packaging>war</packaging>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.json/json -->
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20160212</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.8.1</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-pool2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
            <version>2.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.7</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.22.1</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>2.22.1</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/jmimemagic/jmimemagic -->
        <dependency>
            <groupId>jmimemagic</groupId>
            <artifactId>jmimemagic</artifactId>
            <version>0.1.2</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <build>
        <sourceDirectory>src</sourceDirectory>

        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <warSourceDirectory>WebContent</warSourceDirectory>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

如果我运行我的应用程序，我将看不到此页面。我可以看到404状态，但没有内容。怎么了？

错误页面不起作用

0 个答案: