Question

我正在尝试使用Jersey来创建RESTful资源。我想要的是点击一个链接，应该访问BookResource并显示数据库中的书籍列表。现在我想要的只是JavaScript中的函数来抛出它确实进行ajax调用的警报。但是，它进入request.fail循环并且没有做任何事情。

BookResource.java


import com.helper.BooksHelper;
import com.servlets.Book;

@Path("/books")
public class BookResource {

    @GET
    @Path("/allBooks")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getAllBooks() {

        BooksHelper bookHelper = new BooksHelper();
        ArrayList<Book> listOfBooks = bookHelper.getListOfBooks();

        ResponseBuilder responseBuilder = Response.status(Status.OK);
        responseBuilder.entity(listOfBooks);

        Response response = responseBuilder.build();
        return response;    
    }

的index.jsp

<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="list.js"></script>
</head>
<body>
    <h2>Library Management System</h2>
    <h3>Welcome, ${username}</h3>

    <p>List of books in library  <a href="" onclick="libBooks();">Click Here</a></p>

    <div id="bookList"></div>
    <p>Visit <a href="http://jersey.java.net">Project Jersey website</a>
    for more information on Jersey!
</body>
</html>

list.js

function libBooks(){

    alert("Inside js");
    //The above alert is displayed
    var requestData = {
            "dataType":  "json",
            "type":  "GET",
            "url":  "http://localhost:8080/library/webapi/books/allBooks"
    };

    var request = $.ajax(requestData);
    alert("Ajax call made");
    //The above alert is displayed

    request.success(function(data) {

        alert("Inside done function");
        //The above alert is not displayed

        var dataReceived =data.listOfBooks;
        var numOfItems = dataReceived.length;
        alert(numOfItems);

    });

    request.fail(function(jqXHR, status, errorMessage) {
        if((errorMessage = $.trim(errorMessage)) === "") {
            alert("An unspecified error occurred.  Check the server error log for details.");
        }
        else {
            alert("An error occurred:  " + errorMessage);
            //The above alert is displayed
        }
    });
}

的web.xml

<servlet>
    <servlet-name>Jersey Web Application</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>jersey.config.server.provider.packages</param-name>
      <param-value>org.-------(hidden).library</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>Jersey Web Application</servlet-name>
    <url-pattern>/webapi/*</url-pattern>
  </servlet-mapping>
</web-app>

我想在index.jsp本身上发出警报，确认ajax调用成功。我开始申请的网址是http://localhost:8080/library/login.jsp 然后成功登录URL更改为http://localhost:8080/library/login，这是我有链接的地方，

库中的书籍列表点击此处

，但点击它除了警报没有任何反应＆＃34;内部js＆＃34;和＆＃34; Ajax调用＆＃34;。我在控制台开发人员工具中遇到错误，这些工具是＆＃34; http://localhost:8080/library/webapi/books/allBooks＆＃34;无法找到。我究竟做错了什么。我在网上跟踪了很多例子，这就是他们如何做到这一点。网址不正确吗？任何帮助将不胜感激。谢谢。

Maven Directory Structure

无法通过AJAX调用调用REST Jersey资源

0 个答案: