我有一个用JS编写的网页，其中包含几个文本字段和一些按钮。该页面是使用JQuery的Javascript，并且我也有一个Java Servlet。我已经将按钮连接到servlet，并且当通过Eclipse部署到Elastic Beanstalk时，一切工作正常……直到我在servlet中实例化AmazonS3对象。然后，除了调用用于实例化S3对象的函数的按钮之外，其他所有东西仍然可以正常工作。我单击它，它只是不执行任何操作，包括在实例化之前运行代码。当我评论亚马逊产品线时，它可以正常工作。
我想念什么？
这是我的文件：
index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Program 4</title>
<script type="text/javascript" src ="js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#bttLoad').click(function(){
$.ajax({
type:'POST',
data: {
action: 'load'
},
url:'AjaxController',
success: function(result){
$('#loadResult').html(result);
}
});
});
$('#bttClear').click(function(){
$.ajax({
type:'POST',
data: {
action: 'clear'
},
url:'AjaxController',
success: function(result){
$('#clearResult').html(result);
}
});
});
$('#bttQuery').click(function(){
var firstName = $('#firstName').val();
var lastName = $('#lastName').val();
$.ajax({
type:'POST',
data: {
firstName: firstName,
lastName: lastName,
action: 'query'
},
url:'AjaxController',
success: function(result){
$('#queryResult').html(result);
}
});
});
});
</script>
</head>
<body>
<fieldset>
<form>
<input type="button" value="Load Data" id ="bttLoad">
<br>
<span id="loadResult"></span>
</form>
</fieldset>
<fieldset>
<form>
<input type="button" value="Clear Data" id ="bttClear">
<br>
<span id="clearResult"></span>
</form>
</fieldset>
<fieldset>
<form>
First Name <input type="text" id="firstName">
Last Name <input type="text" id="lastName">
<input type="button" value="Query" id ="bttQuery">
<br>
<span id="queryResult"></span>
</form>
</fieldset>
</body>
</html>
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" 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>program4</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>AjaxController</display-name>
<servlet-name>AjaxController</servlet-name>
<servlet-class>controller.AjaxController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AjaxController</servlet-name>
<url-pattern>/AjaxController</url-pattern>
</servlet-mapping>
</web-app>
最后是AjaxController.java（servlet）
package controller;
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;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
/**
* Servlet implementation class AjaxController
*/
public class AjaxController extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public AjaxController() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
String action = request.getParameter("action");
if (action.contentEquals("load")) {
//String fullname = request.getParameter("fullname");
out.println("load");
}
else if (action.contentEquals("clear")) {
out.println("clear");
myfunc(response);
/*
int number1 = Integer.parseInt(request.getParameter("number1"));
int number2 = Integer.parseInt(request.getParameter("number2"));
out.println(number1 + number2);
myfunc(response);
*/
}
else if (action.contentEquals("query")) {
//perform the query
out.println("we gonna do da query, mon");
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
out.println(firstName + " " + lastName);
}
//doGet(request, response);
}
public static void myfunc(HttpServletResponse response) throws IOException {
PrintWriter out = response.getWriter();
for (int i = 0; i < 100; i++) {
out.println(i);
}
AmazonS3 s3 = AmazonS3ClientBuilder.standard().build();
}
}
找到了解决方案。
结果是，即使我将jar添加到我的项目中，我也没有将AWS开发工具包上传到Elastic Beanstalk（我不使用Maven）。
我要做的是...
首先，将jar拖放到我在Eclipse中的项目中的WebContent文件夹WEB-INF中，lib。
其次，右键单击该项目，然后转到“构建路径”，“配置构建路径”。在打开的窗口中，选择顶部的“库”选项卡。在右侧，有一些按钮。其中之一是“添加外部JAR”，我之前已经完成过将AWS开发工具包添加到我的项目中的工作。但是我还必须单击“添加JAR”。在弹出的窗口中，导航到前面提到的lib文件夹，然后从此处添加jar。
一旦我这样做并重新部署到Elastic Beanstalk，调用包含AWS代码的函数的按钮现在就可以使用！