使用Java / Jersey返回404响应时，为什么会得到静态text / html？

殷建弼

2023-03-14

问题内容：

我正在使用托管在Google App Engine上的Java，Jetty和Jersey 2.18（目前最新）。

假设我有一项服务

@GET
@Produces(MediaType.APPLICATION_JSON)
@Path("/{userId}")
public Response getUser(@PathParam("userId") String userId)
{
    ...
}

当我做：

    return Response.ok()
            .entity(user)
            .build();

我正确地收到了一个application / json内容类型和主体。但是当我这样做时：

    return Response
            .status(404)
            .entity(new ResponseModel(100, "user not found"))
            .build();

与返回任何4XX或5XX状态相同，我收到一个text / html内容类型以及以下HTML正文：

<html>
  <head>
    <meta http-equiv="content-type" content="text/html;charset=utf-8">
    <title>404 Not Found</title>
  </head>
  <body text=#000000 bgcolor=#ffffff>
    <h1>Error: Not Found</h1>
  </body>
</html>

而不是我放入.entity（）的对象

编辑：这是我的web.xml

<?xml version="1.0" encoding="utf-8"?>
<web-app
    version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <servlet>
        <servlet-name>Jersey Web Application</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.mypackage.services;org.codehaus.jackson.jaxrs</param-value>
        </init-param>
        <init-param>
            <param-name>jersey.config.server.provider.classnames</param-name>
            <param-value>
                org.glassfish.jersey.server.gae.GaeFeature;
                org.glassfish.jersey.server.mvc.jsp.JspMvcFeature;
                org.glassfish.jersey.media.multipart.MultiPartFeature;
            </param-value>
        </init-param>
        <init-param>
            <param-name>com.sun.jersey.config.feature.Trace</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey Web Application</servlet-name>
        <url-pattern>/rest/*</url-pattytern>
    </servlet-mapping>

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

    <filter>
        <filter-name>ObjectifyFilter</filter-name>
        <filter-class>com.googlecode.objectify.ObjectifyFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>ObjectifyFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- Spring Security Filter -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml  </param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <filter>
        <filter-name>GlobalResponseFilter</filter-name>
        <filter-class>com.mypackage.GlobalResponseFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>GlobalResponseFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <security-constraint>
        <web-resource-collection>
            <web-resource-name>everything</web-resource-name>
            <url-pattern>/*</url-pattern>
        </web-resource-collection>
        <user-data-constraint>
            <transport-guarantee>CONFIDENTIAL</transport-guarantee>
        </user-data-constraint>
    </security-constraint>

    <!-- ** -->
    <!-- ** General session timeout in minutes -->
    <!-- ** -->

    <session-config>
        <session-timeout>1440</session-timeout>
    </session-config>    
</web-app>

ResponseModel只是一个基本的可序列化的Java类：

import java.io.Serializable;


public class ResponseModel implements Serializable
{
    private static final long   serialVersionUID    = 1L;

    private int                 code;
    private Serializable        data;

    public ResponseModel()
    {
    }

    public ResponseModel(int code, Serializable data)
    {
        System.err.println("Code " + code + " : " + data);
        this.code = code;
        this.data = data;
    }

    public int getCode()
    {
        return code;
    }

    public void setCode(int code)
    {
        this.code = code;
    }

    public Serializable getData()
    {
        return data;
    }

    public void setData(Serializable data)
    {
        this.data = data;
    }
}

问题答案：

您可以使用以下配置再试一次：

<servlet>
    <servlet-name>API</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    ...
    <init-param>
        <param-name>jersey.config.server.response.setStatusOverSendError</param-name>
        <param-value>true</param-value>
   </init-param>
</servlet>

此标志定义在发送4xx或5xx响应状态时，Jersey是否使用ServletResponse.sendError（标志为false）还是ServletResponse.setStatus（标志为true）。

调用ServletResponse.sendError通常会重置响应实体和标头，并返回状态文本的（text / html）错误页面。

由于您要返回自己的自定义错误实体，因此需要将此标志设置为true。

使用Java / Jersey返回404响应时，为什么会得到静态text / html？

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