jsonp 跨域

最新推荐文章于 2021-07-15 09:54:07 发布

Erwinfan

最新推荐文章于 2021-07-15 09:54:07 发布

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本文链接：https://blog.youkuaiyun.com/rommel2171226/article/details/43446427

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java中jsonp JsonPTest.java

package cn.com.jsonp;

import java.io.IOException;

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

public class JsonPTest extends HttpServlet {

    private static final long serialVersionUID = -5143030889814730794L;

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.getRequestDispatcher("WEB-INF/view/jsonp.jsp").forward(request, response);
    }

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(request, response);
    }
}

java处理json数据并转发ServerTest.java

/**
* Project Name:jsonpTest
* File Name:ServerTest.java
* Package Name:cn.com.jsonp
* Date:2015年2月2日下午8:21:11
* Copyright (c) 2015, chenzhou1025@126.com All Rights Reserved.
*
*/

package cn.com.jsonp;

import java.io.IOException;

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

import net.sf.json.JSONObject;

/**
* ClassName:ServerTest <br/>
* Function: TODO ADD FUNCTION. <br/>
* Reason:   TODO ADD REASON. <br/>
* @version
* @since    JDK 1.7
* @see
*/
public class ServerTest extends HttpServlet {

    /**
     * serialVersionUID:TODO(用一句话描述这个变量表示什么).
     * @since JDK 1.7
     */

    private static final long serialVersionUID = 1176528307423083925L;

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        System.out.println(request.getParameter("jtusersessionid"));
        String responseText = "[{ \"firstName\": \"Brett\", \"lastName\":\"McLaughlin\", \"email\": \"aaaa\" },{ \"firstName\": \"Jason\", \"lastName\":\"Hunter\", \"email\": \"bbbb\"},{ \"firstName\": \"Elliotte\", \"lastName\":\"Harold\", \"email\": \"cccc\" }]";
        String callBack = request.getParameter("callback");
        JSONObject jsonObj = new JSONObject();
        jsonObj.put("data", responseText);
        if (callBack != null) {
            StringBuffer sb = new StringBuffer(callBack);
            sb.append("(");
            sb.append(jsonObj.toString());
            sb.append(")");
            response.getWriter().print(sb.toString());
        } else {
            response.getWriter().print(jsonObj.toString());
        }
    }

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(request, response);
    }

}

json接收文件 jsonp.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"
   isELIgnored="false"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript" src="/js/jquery-1.8.2.js"></script>
<title>测试jsonP</title>
<script type="text/javascript">
   function pointActivity() {
       path = '/serverTest.do';
       var jtusersessionid = '${cookie.JSESSIONID.value}';
       if (jtusersessionid != null && jtusersessionid != ""
               && jtusersessionid != 'null') {
           path = path + "?jtusersessionid=" + jtusersessionid;
       }
       $.ajax({
           type : 'GET',
           cache : false,
           dispose : true,
           reload : false,
           url : path,
           dataType : "jsonp",
           success : function(json) {
               var json1 = eval(json.data);
               var jsonString = "";
               for (var i = 0; i < json1.length; i++) {
                   jsonString += "姓名 :" + json1[i].firstName + "邮箱 :" + json1[i].email;
                   if(i!=json1.length-1){
                       jsonString += ",";
                   }
               }
               $("#returnJsonString").html(jsonString);
           },
           error : function() {
               alert('fail');
           }
       });
   }

   function success_jsonpCallback(data) {
       alert(data.data);
   }
</script>
</head>
<body>
   <h3>测试jsonP</h3>
   <input type="button" value="提交" οnclick="pointActivity();" />

   <div>jsonp返回的json数据:</div><div id="returnJsonString"></div>
</body>
</html>

前段jsp index.jsp