如何从JavaScript调用servlet [英] How to call servlet from javascript

问题描述

web.xml中的Servlet配置

Servlet Configuration in web.xml

<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>DataEntry</servlet-name>
    <servlet-class>com.ctn.origin.connection.DataEntry</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>DataEntry</servlet-name>
    <url-pattern>/dataentry</url-pattern>
  </servlet-mapping>

JavaScript:

Javascript :

<script type="text/javascript">
    function unloadEvt() {

        document.location.href='/test/dataentry';

    }
</script>

但是使用此javascript不能调用我的servlet.

But using this javascript can't call my servlet.

有什么错误吗?如何调用servlet?

Is there any error ? how to call servlet ?

推荐答案

这可以使用ajax完成

This can be done using ajax

<script type="text/javascript">
    function loadXMLDoc() {
        var xmlhttp;
        if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp = new XMLHttpRequest();
        } else {// code for IE6, IE5
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange = function() {
            if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
            }
        }
        xmlhttp.open("GET", "/testmail/dataentry", true);
        xmlhttp.send();
    }
</script>

这篇关于如何从JavaScript调用servlet的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！