Question

我对java很新，我试图在这里发布解决方案：How to use Servlets and Ajax?，但是jQuery调用没有执行servlet。

Servlet代码如下：

package com.morley.app;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AjaxTest extends HttpServlet {

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String text = "some text";
    System.out.println("Im working");
    response.setContentType("text/plain");  // Set content type of the response so that jQuery knows what it can expect.
    response.setCharacterEncoding("UTF-8"); // You want world domination, huh?
    response.getWriter().write(text);       // Write response body.
}
}

我的web.xml映射如下：

<servlet>    
    <servlet-name>AjaxTest</servlet-name>
    <servlet-class>com.test.app.AjaxTest</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>AjaxTest</servlet-name>
    <url-pattern>/AjaxTest</url-pattern>
</servlet-mapping>

我的jsp如下：

<head>
    <title>SO question 4112686</title>

    <script type="text/javascript" src="<%= request.getContextPath() %>/js/jquery-latest.min.js"></script>

    <script>
        $(document).ready(function() {                        // When the HTML DOM is ready loading, then execute the following function...

            $('#somebutton').click(function() {               // Locate HTML DOM element with ID "somebutton" and assign the following function to its "click" event...

                $.get('AjaxTest', function(responseText) { // Execute Ajax GET request on URL of "someservlet" and execute the following function with Ajax response text...
                    //alert('ready');
                    $('#somediv').text(responseText);         // Locate HTML DOM element with ID "somediv" and set its text content with the response text.
                });

            });    
        });
    </script>

</head>
<body>
    <button id="somebutton">press here</button>
    <div id="somediv"></div>
</body>

如果有人能帮助我弄清楚为什么doGet没有开火，那将非常感激

Answer 1

检查是否正在执行ajax命令并将请求发送到正确的地址。

您可以通过执行ctrl + shift + c打开控制台窗口并进入网络来检查它，以帮助您进行调试。（Firefox为此提供了萤火虫）。

Ps：创建ServLet后重启服务器。 JSP文件启动，但是对于servlet，您需要重新启动服务器才能启动并运行它们。

jQuery没有执行servlet doGet

1 个答案: