How to configure welcome file (HTML/JSP) i

问题:

I have a Jersey RESTful web service project. I have configured the Jersey container in the web.xml and everything works fine.

In the same project, I have introduced one HTML page and included in the <welcome-file-list> to handle some other non-REST request. But when I am accessing the URL, the welcome file is not displayed.

After I commented the Jersey container configuration in web.xml and deployed the application, this time I am able to access the welcome file.

Am using Tomcat 7, JDK 7, Jersey 2.2 and Eclipse Juno. How to make the welcome file working when Jersey has configured? Is there any limitations with Jersey or do I need configure in different way to achieve this?

My web.xml:

<?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com /xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>My Service</display-name>
  <servlet>
    <servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>jersey.config.server.provider.packages</param-name>
      <param-value>com.my.rest.service</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>    
  </servlet>
  <servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/*</url-pattern>
 </servlet-mapping>      
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file> 
  </welcome-file-list>
</web-app>

回答1:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>com.webservice.services</display-name>
    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>com.webservice.services</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/service/*</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

Try URL pattern with different path like given above (/service/*) for REST. It works and welcome file displays when server starts.

回答2:

your current servlet mapping is

<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/*</url-pattern>

which redirects every request to jersey. so to make welcome page visible you need to make entry like

<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest</url-pattern>

this pattern will call jersey only for urls like

http://localhost:8080/rest/

and thus url

http://localhost:8080/index.html

will not be redirected to jersey servlet.

A project targetting same scenario is hosted on https://github.com/skohli0302/jims

回答3:

In web.xml:

<servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/somethinghere/*</url-pattern>
</servlet-mapping>

instead of

<servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

回答4:

You can have something like

<servlet-mapping>
    <servlet-name>Jersey REST Service</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

<servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>/index.html</url-pattern>
</servlet-mapping>

回答5:

When you use jersey, all the requests are directed to jersey servlet i.e. ServletContainer. So if any request that does not match to any mapped rest class, it throws 404. But you can always add servlet filters to intercept the incoming request. Depending on the incoming HTTP request URL(defualt/welcome etc), you can take a decision to redirect it to the weclome page:

HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.sendRedirect("/welcome.jsp");

回答6:

I am just curious to know, will the below example work?

HttpServletResponse httpResponse = (HttpServletResponse) response; httpResponse.sendRedirect("/welcome.jsp"); if it will, where this sendRedirect() to be called? with in a servlet, so if i am not wrong, there should be a servlet, which just redirects the request to the first/default page, right?

回答7:

you can create the class "API", and insert an anotation in your project. Class ApplicationConfig...

@ApplicationPath("api") //anotation

public class ApplicationConfig extends Application { }

after, i create class "Users" that stay...

Class UserApi

@Path("users")//anotation page User.

public class UserApi {

.... mycode complement page....

@GET

@Path("list")

@Produces("application/json")

public String getUsuarios() throws Exception {

    String json = new Gson().toJson(this.userD.listar());

    return (json);

}

remember that your root project stay ... http://yourprojectpatc.com.br/api/users/list

using the "Postman" modify for Json to to send your data