On cross domain access of JQuery+ajax+jsonp

2021-07-01 06:16:10
OfStack

Jsonp (JSON with Padding) is a "usage mode" of the data format json that allows Web pages to retrieve data from other domains.

1. Client


<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
<title>Insert title here</title> 
<script type="text/javascript" src="resource/js/jquery-1.7.2.js"></script> 
</head> 
<script type="text/javascript"> 
$(function(){   
  /* 
  // Short form, the effect is the same  
  $.getJSON("http://app.example.com/base/json.do?sid=1494&busiId=101&jsonpCallback=?", 
      function(data){ 
        $("#showcontent").text("Result:"+data.result) 
  }); 
  */ 
  $.ajax({ 
    type : "get", 
    async:false, 
    url : "http://app.example.com/base/json.do?sid=1494&busiId=101", 
    dataType : "jsonp",// The data type is jsonp 
    jsonp: "jsonpCallback",// The server is used to receive callback Called function Parameters of name  
    success : function(data){ 
      $("#showcontent").text("Result:"+data.result) 
    }, 
    error:function(){ 
      alert('fail'); 
    } 
  });  
}); 
</script> 
<body> 
<div id="showcontent">Result:</div> 
</body> 
</html>

2. Server side


import java.io.IOException; 
import java.io.PrintWriter; 
import java.util.HashMap; 
import java.util.Map; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import net.sf.json.JSONObject; 
import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.RequestMapping; 
 
@Controller 
public class ExchangeJsonController { 
  @RequestMapping("/base/json.do") 
  public void exchangeJson(HttpServletRequest request,HttpServletResponse response) { 
    try { 
    response.setContentType("text/plain"); 
    response.setHeader("Pragma", "No-cache"); 
    response.setHeader("Cache-Control", "no-cache"); 
    response.setDateHeader("Expires", 0); 
    Map<String,String> map = new HashMap<String,String>();  
    map.put("result", "content"); 
    PrintWriter out = response.getWriter();    
    JSONObject resultJSON = JSONObject.fromObject(map); // Assemble as needed json 
    String jsonpCallback = request.getParameter("jsonpCallback");// Client request parameters  
    out.println(jsonpCallback+"("+resultJSON.toString(1,1)+")");// Return jsonp Format data  
    out.flush(); 
    out.close(); 
   } catch (IOException e) { 
    e.printStackTrace(); 
   } 
  } 
}