How does Ajax pass data in the background through response? (with code)

This time I will show you how Ajax transmits data in the background through response? (Code attached), what are the precautions for Ajax to transfer data in the background through response? Here is a practical case, let’s take a look.

This is the js code:

var System = { 
  getHttpRequest: function(url, callback, options) { 
    if (url.length < 0) return; 
    var option = { 
      url: url, 
      type: "get", 
      dataType: "json", 
      cache: false, 
      timeout: 30000, 
      beforeSend: function(XHR) { 
      }, 
      complete: function(XHR, textStatus) { 
        XHR.abort(); 
      }, 
      error: function(XMLHttpRequest, textStatus, errorThrown) { 
        //alert("网络连接不通，请稍后再试！"); 
      }, 
      success: function(data) { 
        callback(data, options); 
      } 
    }; 
    if ( !! options) { 
      option = $.extend(option, options); 
    } 
    $.ajax(option); 
  } 
};

When I want to get data through the callback functionsuccess, at first I return a json character directly in the background String , the result will be an exception, and there is no defined method or anything. After checking, I need to write data through the response.getWriter().write() method, and then the data can be obtained in success. The background code is as follows:

public String getRejectReason() throws Exception{ 
    String rowId = getParameterAndPut("rowId",null,0).toString(); 
    String jsonData = ""; 
    if (StringUtils.isNotEmpty(rowId)) { 
      jsonData = newOwnerInfoService.getRejectReasonJsonData(rowId); 
    } 
    this.getResponse().setCharacterEncoding("utf-8"); 
    this.getResponse().getWriter().write(jsonData); 
    return null; 
}

Summary

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other php Chinese websites related articles!

Recommended reading:

How to implement WebApi Ajax cross-domain request using CORS

How to implement dynamic loading of combo box with Ajax (With code)

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