系统找不到指定路径?是浏览器没有清除缓存吗？
警告: 异常处理加载程序[WebappLoader[/ajax]]后台进程
java.lang.IllegalStateException: java.io.FileNotFoundException: D:\apache-tomcat-8.5.53\webapps\ajax\WEB-INF\lib\fastjson-1.2.53.jar (系统找不到指定的路径。)
package com.imooc.ajax;
public class News {
private String title;
private String date;
private String source;
private String content;
public News() {
}
public News(String title, String date, String source, String content) {
super();
this.title = title;
this.date = date;
this.source = source;
this.content = content;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
package com.imooc.ajax;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.alibaba.fastjson.JSON;
/**
* Servlet implementation class NewsListServlet
*/
@WebServlet("/news_list")
public class NewsListServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public NewsListServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
List list = new ArrayList();
list.add(new News("TIOBE:2018年5月份全球编程语言排行榜" , "2018-5-1" , "TIOBE" , "..."));
list.add(new News("TIOBE:2018年6月份全球编程语言排行榜" , "2018-6-1" , "TIOBE" , "..."));
list.add(new News("TIOBE:2018年7月份全球编程语言排行榜" , "2018-7-1" , "TIOBE" , "..."));
list.add(new News("TIOBE:2018年8月份全球编程语言排行榜" , "2018-8-1" , "TIOBE" , "..."));
String json = JSON.toJSONString(list); //json是fastjson为提供的java对象
System.out.println(json);
response.setContentType("text/html;charset=utf-8");
response.getWriter().println(json);
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<div id="container">
</div>
<script type="text/javascript">
//1.创建XmlHttpRequest
var xmlhttp;
if(window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
//2.发送Ajax请求
//true表示异步执行，false表示同步执行
xmlhttp.open("GET" , "/ajax/news_list" , false);
xmlhttp.send();
console.log("请求发送完成！");
if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
var text = xmlhttp.responseText;
console.log(text);
var json = JSON.parse(text); //json是javascript内置的对象
console.log(json);
var html = "";
for(var i=0; i<json.length; i++){
var news = json[i];
html = html + "<h1>" + news.title + "</h1>";
html = html + "<h2>" + news.date + " " + news.source + " " + news.content + "</h2>";
html = html + "<hr/>";
document.getElementById("container").innerHTML = html;
}
}
//3.处理服务器响应
/* xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
var text = xmlhttp.responseText;
console.log(text);
var json = JSON.parse(text); //json是javascript内置的对象
console.log(json);
var html = "";
for(var i=0; i<json.length; i++){
var news = json[i];
html = html + "<h1>" + news.title + "</h1>";
html = html + "<h2>" + news.date + " " + news.source + " " + news.content + "</h2>";
html = html + "<hr/>";
document.getElementById("container").innerHTML = html;
}
}
}*/
</script>
</body>
</html>
正在回答
同学你好，测试同学的代码是正确的。如下所示：
同学可以检查一下路径是否正确。课程中的ajax是老师的项目名，如下：
如果路径正确，可能是缓存的原因，同学你可以清理一下浏览器缓存以及对eclipse进行clean。
如果我的回答解决了你的疑惑，请采纳，祝学习愉快~
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