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如果你现在正在使用Restful API，并且你需要通过web项目来构建json格式字符串的响应，那么这篇文章将帮助你使用javascript来创建json格式字符串。这是非常有用的，我们将通过jQuery插件$.toJSON把数据对象转换为json格式。 

使用JavaScript构建JSON格式字符串 

JavaScript代码

在这里包含了javascript代码。$(“#form”).submit(function(){}- delete_button是form标签的ID，我们通过element.val()调用表单输入框的值。
代码如下:
<script src="jquery.min.js"></script> 
<script src="jquery.json-2.2.js"></script> 
<script src="GetPostAjax.js"></script> 
<script type="text/javascript"> 
$(document).ready(function() 
{ 
$("#form").submit(function(e){ 
e.preventDefault(); 
var username,email,password,gender; 
username=$("#username").val(); 
email=$("#email").val(); 
password=$("#username").val(); 
gender=$("#gender").val(); 
if(username.length>0 && email.length>0 && password.length>0 &&gender.length>0) 
{ 
//Creating Objects 
var request = new Object(); 
var userDetails = new Object(); 
var user = new Object(); 
var websites=new Array(); 
user.name=username; 
user.email=email; 
user.password=password; 
user.gender=gender; 
//Array Push 
if(website1.length>0) 
websites.push(website1); 
if(website2.length>0) 
websites.push(website2); 
if(website3.length>0) 
websites.push(website3); 
user.websites=websites; 
userDetails.user = user; 
request.userDetails = userDetails; 
var jsonfy = $.toJSON(request); 
// Encodes special characters 
var encodedata = 'jsondata='+encodeURIComponent(jsonfy); 
//Ajax Call 
var url='website API URL'; 
post_data(url,encodedata, function(data) { 
alert("Success"); 
}); 
} 
}); 
}); 
</script">

HTML代码

代码如下:
<form method='post' action='' id='form'> 
Name 
<input type='text' name='username' id='username' /> 
Email 
<input type='text' name='email' id='email' /> 
Password 
<input type='text' name='password' id='password' /> 
Gender 
<select name='gender' id='gender'><option value='male'>Male</option><option value='female'>Female</option></select> 
Websites 
<input type='text' id='website1' /> 
<input type='text' id='website2' /> 
<input type='text' id='website3' /> 
<input type='submit' id='submit'/> 
</form>

JSON输出

代码如下:
{ 
    "userDetails":{ 
    "user":{ 
    "name":"Srinivas Tamada", 
    "email":"srinivas@9lessons.info", 
    "password":"Srinivas Tamada", 
    "gender":"male", 
    "websites":["www.software8.co","www.heatpress123.net","www.0769zzw.com"] 
    } 
  } 
}

JSON Encoded 

对特殊字符进行编码，会把以下字符进行编码：
代码如下:
, / ? : @ & = + $ # 
jsondata=%7B%22userDetails%22%3A%7B%22user%22%3A%7B%22name%22%3A%22Srinivas%20Tamada%22%2C%22email%22%3A%22srinivas%409lessons.info%22%2C%22password%22%3A%22Srinivas%20Tamada%22%2C%22gender%22%3A%22male%22%2C%22websites%22%3A%5B%22www.9lessons.info%22%2C%22www.egglabs.in%22%2C%22www.fglogin.com%22%5D%7D%7D%7D

GetPostAjax.js 

这里定义了jquery的ajax请求方法。
代码如下:
function post_data(url,encodedata, success){ 
$.ajax({ 
type:"POST", 
url:url, 
data :encodedata, 
dataType:"json", 
restful:true, 
contentType: 'application/json', 
cache:false, 
timeout:20000, 
async:true, 
beforeSend :function(data) { }, 
success:function(data){ 
success.call(this, data); 
}, 
error:function(data){ 
alert("Error In Connecting"); 
} 
}); 
}

java创建json对象

// 声明两个json数组  
[java] view plain copy print?
      JSONArray gResTable = new JSONArray();   
      JSONArray gCmtTable = new JSONArray();   
// 声明json对象       
ONObject outData = new JSONObject();  
//把json数组加到json对象中  
[java] view plain copy print?
outData.put("ResTable", gResTable);  
outData.put("CmtTable", gCmtTable);  
  //此时创建出来的如下:jsonData={"ResTable":[],"CmtTable":[]};  
  把json数据加到json数组中  
for (int i = 0; i < 2; i ++)  
{  
    JSONObject node = new JSONObject();  
    node.put("thumb_path", "./Image/" + i +".gif");  
    node.put("flash_path", "./Image/" + i +".gif");  
    node.put("desc1", "可疑车辆" + i);  
    node.put("desc2", "");  
    node.put("desc3", "");  
    node.put("desc4", "");  
    node.put("title", "hello");  
    node.put("upload_time", (new java.util.Date()).toString());  
    node.put("uploader", "王二");  
    gResTable.put(node);  
}  
  
for (int i = 0; i < 2; i ++)  
{  
    JSONObject node = new JSONObject();  
    node.put("logo_path", "./Image/" + i +".gif");  
    node.put("comment", "hello");  
    node.put("comment_time", (new java.util.Date()).toString());  
    node.put("author", "王二");  
    gCmtTable.put(node);  
}
建出来的json格式如下：  
[java] view plain copy print?
/* 
    jsonData={"ResTable":[ 
    {"upload_time":"Sat May 26 20:16:37 CST 2012","title":"hello","flash_path":"./Image/0.gif","uploader":"王二","thumb_path":"./Image/0.gif","desc3":"","desc4":"","desc1":"可疑车辆0","desc2":""}, 
    {"upload_time":"Sat May 26 20:16:37 CST 2012","title":"hello","flash_path":"./Image/1.gif","uploader":"王二","thumb_path":"./Image/1.gif","desc3":"","desc4":"","desc1":"可疑车辆1","desc2":""}], 
    "CmtTable": 
    [{"author":"王二","logo_path":"./Image/0.gif","comment":"hello","comment_time":"Sat May 26 20:16:37 CST 2012"}, 
    {"author":"王二","logo_path":"./Image/1.gif","comment":"hello","comment_time":"Sat May 26 20:16:37 CST 2012"} 
 ]}; 
*/

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