已拦截跨源请求：同源策略禁止读取位于 http://localhost:8080/*的远程资源。（原因：CORS 头缺少 ‘Access-Control-Allow-Origin‘）。

已拦截跨源请求：同源策略禁止读取位于 http://localhost:8080/*的远程资源。（原因：CORS 头缺少 'Access-Control-Allow-Origin'）。

青春不流名

35064人浏览 · 2016-05-04 09:46:03

青春不流名 · 2016-05-04 09:46:03 发布

package com.ajax.TestServlet;
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 MyServlet extends HttpServlet {
   private static final long serialVersionUID = -925897313545216227L;
   @Override
   protected void service(HttpServletRequest request,
           HttpServletResponse response) throws ServletException, IOException {
       request.setCharacterEncoding("UTF-8");
       response.setCharacterEncoding("UTF-8");
       response.setHeader("Content-type", "text/html;charset=UTF-8");
       /**
       * front request ajax.html
       *    <!DOCTYPE html>
           <html>
           <head>
           <meta charset="UTF-8">
           <title>Insert title here</title>
           <script src="http://code.jquery.com/jquery-latest.js"></script>
           <script type="text/javascript">
               $(document).ready(function(){
                   alert("benging");
                   $.ajax({
                       url:"http://localhost:8080/wo.ajax",
                       type:"get",
                       success:function(data,status){
                           alert(data);
                       },
                       error:function(xhr,status,orr){
                           alert(status+":"+orr);
                       }
                   });
               });
           </script>
           </head>
           <body>
           </body>
           </html>
       *
       */
       /**
       * 已拦截跨源请求：同源策略禁止读取位于 http://localhost:8080/wo.ajax 的远程资源。（原因：CORS 头缺少 'Access-Control-Allow-Origin'）
       * case when condition 1 (cause) : file:///C:/Users/Administrator/Desktop/ajax.html
       * otherwise condition 2 : http://localhost:8080/
       */
       //response.setHeader("Access-Control-Allow-Origin","*");
       StringBuffer sb = new StringBuffer();
       sb.append("{\"name\":\"");
       sb.append("Ajax");
       sb.append("\",\"code\":\"");
       sb.append("200");
       sb.append("\"");
       sb.append("}");
       System.out.println("running ");
       PrintWriter printWriter = response.getWriter();
       printWriter.println(sb.toString());
       printWriter.flush();
       printWriter.close();
       /**
       *
       * <?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_3_0.xsd"
       version="3.0">
           <servlet>
               <servlet-name>MyServlet</servlet-name>
               <servlet-class>com.ajax.TestServlet.MyServlet</servlet-class>
               <load-on-startup>1</load-on-startup>
           </servlet>
           <servlet-mapping>
               <servlet-name>MyServlet</servlet-name>
               <url-pattern>*.ajax</url-pattern>
           </servlet-mapping>
           <welcome-file-list>
               <welcome-file>ajax.html</welcome-file>
           </welcome-file-list>
       </web-app>
       */
   }
}

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