如何把json对象转换成字符串 如何把json对象转换成字符串

\u5982\u4f55\u5c06 javascript \u5bf9\u8c61\u8f6c\u6362\u6210 json\u5b57\u7b26\u4e32

JSON\uff08JavaScript Object Notation\uff09 \u662fJavaScript\u7f16\u7a0b\u8bed\u8a00\u7684\u4e00\u4e2a\u5b50\u96c6\u3002\u6b63\u56e0JSON\u662fJavaScript\u7684\u4e00\u4e2a\u5b50\u96c6\uff0c\u6240\u4ee5\u5b83\u53ef\u6e05\u6670\u7684\u8fd0\u7528\u4e8e\u6b64\u8bed\u8a00\u4e2d\u3002
eval\u51fd\u6570 JSON\u6587\u672c\u8f6c\u6362\u4e3a\u5bf9\u8c61
\u4e3a\u4e86\u5c06JSON\u6587\u672c\u8f6c\u6362\u4e3a\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4f7f\u7528eval\u51fd\u6570\u3002eval\u51fd\u6570\u8c03\u7528JavaScript\u7f16\u8f91\u5668\u3002\u7531\u4e8eJSON\u662fJavaScript\u7684\u5b50\u96c6\uff0c\u56e0\u6b64\u7f16\u8bd1\u5668\u5c06\u6b63\u786e\u7684\u89e3\u6790\u6587\u672c\u5e76\u4ea7\u751f\u5bf9\u8c61\u7ed3\u6784\u3002\u6587\u672c\u5fc5\u987b\u62ec\u5728\u62ec\u53f7\u4e2d\u907f\u514d\u4ea7\u751fJavaScript\u7684\u8bed\u6cd5\u6b67\u4e49\u3002
var obj = eval('(' + JSONTest + ')');
eval\u51fd\u6570\u975e\u5e38\u5feb\u901f\u3002\u5b83\u53ef\u4ee5\u7f16\u8bd1\u6267\u884c\u4efb\u4f55JavaScript\u7a0b\u5e8f\uff0c\u56e0\u6b64\u4ea7\u751f\u4e86\u5b89\u5168\u6027\u95ee\u9898\u3002\u5f53\u4f7f\u7528\u53ef\u4fe1\u4efb\u4e0e\u5b8c\u5584\u7684\u6e90\u4ee3\u7801\u65f6\u624d\u53ef\u4ee5\u4f7f\u7528eval\u51fd\u6570\u3002\u8fd9\u6837\u53ef\u4ee5\u66f4\u5b89\u5168\u7684\u89e3\u6790JSON\u6587\u672c\u3002\u4f7f\u7528XmlHttp\u7684web\u5e94\u7528\uff0c\u9875\u9762\u4e4b\u95f4\u7684\u901a\u8baf\u53ea\u5141\u8bb8\u540c\u6e90\uff0c\u56e0\u6b64\u662f\u53ef\u4ee5\u4fe1\u4efb\u7684\u3002\u4f46\u8fd9\u5374\u4e0d\u662f\u5b8c\u5584\u7684\u3002\u5982\u679c\u670d\u52a1\u5668\u6ca1\u6709\u4e25\u8c28\u7684JSON\u7f16\u7801\uff0c\u6216\u8005\u6ca1\u6709\u4e25\u683c\u7684\u8f93\u5165\u9a8c\u8bc1\uff0c\u90a3\u4e48\u53ef\u80fd\u4f20\u9001\u5305\u62ec\u5371\u9669\u811a\u672c\u7684\u65e0\u6548JSON\u6587\u672c\u3002eval\u51fd\u6570\u5c06\u6267\u884c\u6076\u610f\u7684\u811a\u672c\u3002
JSON\u89e3\u91ca\u5668 JSON.parse\u3001JSON.stringify
\u4f7f\u7528JSON\u89e3\u6790\u5668\u53ef\u4ee5\u9632\u6b62\u50cfeval\u51fd\u6570\u8f6c\u6362JSON\u6587\u672c\u4e3a\u5bf9\u8c61\u90a3\u6837\u7684\u5b89\u5168\u9690\u60a3\u3002JSON\u89e3\u6790\u5668\u53ea\u80fd\u8fa8\u8bc6JSON\u6587\u672c\uff0c\u62d2\u7edd\u6240\u6709\u811a\u672c\u3002\u63d0\u4f9b\u4e86\u672c\u5730JSON\u652f\u6301\u7684\u6d4f\u89c8\u5668\u7684JSON\u89e3\u6790\u5668\u5c06\u8fdc\u5feb\u4e8eeval\u51fd\u6570\u3002
\u76ee\u524d\uff0cFirefox\u3001Opera\u3001IE8\u4ee5\u4e0a\u7248\u672c\u4e5f\u63d0\u4f9b\u4e86\u672c\u5730JSON\u652f\u6301\u3002\u5176\u4e2d\uff0cJSON\u89e3\u91ca\u5668\u63d0\u4f9b\u7684\u51fd\u6570\u6709\uff1aJSON.parse\u3001JSON.stringify\u3002
\u5bf9\u4e8e\u90a3\u4e9b\u5e76\u4e0d\u63d0\u4f9b\u672c\u5730JSON\u652f\u6301\u7684\u6d4f\u89c8\u5668\u53ef\u4ee5\u5f15\u5165\u811a\u672cjson2.js\uff0c\u6765\u5b9e\u73b0JSON\u8f6c\u6362\u529f\u80fd\u3002json2.js\u811a\u672c\u53ef\u5230https://github.com/douglascrockford/JSON-js/blob/master/json2.js\u9875\u9762\u4e0b\u8f7d\u3002
JSON.parse \u51fd\u6570
\u5c06JSON\u6587\u672c\u8f6c\u6362\u4e3a\u5bf9\u8c61\u3002
JSON.parse(text[, reviver])
\u53c2\u6570
text
\u5fc5\u9009\u9879\u3002\u8981\u8f6c\u6362\u4e3a\u5bf9\u8c61\u7684JSON\u6587\u672c\u3002
reviver
\u53ef\u9009\u9879\u3002\u8be5\u53c2\u6570\u662f\u4e2a\u66ff\u6362\u51fd\u6570\u3002\u5728\u8f6c\u6362\u4e2d\uff0c\u904d\u5386\u7684\u6bcf\u4e2a\u8282\u70b9\uff0c\u90fd\u5c06\u6267\u884c\u8be5\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5c06\u66ff\u4ee3\u8f6c\u6362\u7ed3\u679c\u7684\u76f8\u5e94\u8282\u70b9\u503c\u3002
JSON.stringify \u51fd\u6570
\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3aJSON\u6587\u672c\u3002
JSON.stringify(value[, replacer[, space]])
\u53c2\u6570
text
\u5fc5\u9009\u9879\u3002\u8981\u8f6c\u6362\u4e3aJSON\u6587\u672c\u7684\u5bf9\u8c61\u3002
reviver
\u53ef\u9009\u9879\u3002\u8be5\u53c2\u6570\u662f\u4e2a\u66ff\u6362\u51fd\u6570\u3002\u5728\u8f6c\u6362\u4e2d\uff0c\u904d\u5386\u7684\u6bcf\u4e2a\u8282\u70b9\uff0c\u90fd\u5c06\u6267\u884c\u8be5\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5c06\u66ff\u4ee3\u8f6c\u6362\u7ed3\u679c\u7684\u76f8\u5e94\u8282\u70b9\u503c\u3002
space
\u53ef\u9009\u9879\u3002\u683c\u5f0f\u5316\u8f93\u51faJSON\u6587\u672c\u7f29\u8fdb\u7684\u7a7a\u683c\u6570\u91cf\u3002\u5982\u679c\u4e0d\u63d0\u4f9b\u8be5\u53c2\u6570\u5c06\u4e0d\u4f1a\u683c\u5f0f\u5316\u8f93\u51fa\u3002
\u53c2\u6570reviver\u7684\u59d4\u6258\u7c7b\u578b
reviver(key, value)
reviver\u51fd\u6570\u7684\u4e2d\u7684this\u662f\u5f53\u524d\u6240\u904d\u5386\u5230\u7684\u8282\u70b9\u7684\u7236\u8282\u70b9\u3002\u5f53\u6240\u904d\u5386\u7684\u662f\u6839\u8282\u70b9\u7684\u65f6\u5019\uff0c\u7236\u8282\u70b9\u662f\u4e2aObject\u5bf9\u8c61\uff0c\u6839\u8282\u70b9\u662f\u8be5\u5bf9\u8c61\u7684\u4e00\u4e2a\u5c5e\u6027\uff0c\u5c5e\u6027\u540d\u662f\u7a7a\u5b57\u7b26\u4e32\u3002
\u53c2\u6570
key
\u5f53\u7236\u8282\u70b9\u662f\u6570\u7ec4Object\uff0ckey\u4e3a\u6570\u7ec4\u7d22\u5f15\uff0c\u5426\u5219key\u4e3aObject\u5c5e\u6027\u540d\u3002
value
\u8282\u70b9\u503c\u3002
\u6ce8\uff1aJSON\u4e0d\u652f\u6301\u5faa\u73af\u6570\u636e\u7ed3\u6784\u3002

\u3000\u3000JSON.parse\u3001JSON.stringify\u4f7f\u7528\u793a\u4f8b

\u3000\u3000[javascript] view plaincopy
\u3000\u3000
\u3000\u3000function InventoryItem(parm) {
\u3000\u3000this.Product = parm.Product
\u3000\u3000this.Quantity = parm.Quantity;
\u3000\u3000this.Price = parm.Price;
\u3000\u3000this.Type = parm.Type;
\u3000\u3000this.Total = function() {
\u3000\u3000return this.Price * this.Quantity;
\u3000\u3000}
\u3000\u3000}
\u3000\u3000
\u3000\u3000function Inventory(parm) {
\u3000\u3000this.Date = parm.Date;
\u3000\u3000this.Item = parm.Item;
\u3000\u3000this.Type = parm.Type;
\u3000\u3000this.Total = function() {
\u3000\u3000var count = 0;
\u3000\u3000for (var key in this.Item) {
\u3000\u3000count += this.Item[key].Total();
\u3000\u3000}
\u3000\u3000return count;
\u3000\u3000}
\u3000\u3000}
\u3000\u3000
\u3000\u3000var inventoryJSONText = "{\"Date\":\"2000-01-01\",\"Item\":[{\"Product\":\"ProductOne\",\"Quantity\":\"10\"
\u3000\u3000,\"Price\":\"10\",\"Type\":\"InventoryItem\"},{\"Product\":\"ProductTwo\",\"Quantity\":\"100\",\"Price\":\"20\"
\u3000\u3000,\"Type\":\"InventoryItem\"}],\"Type\":\"Inventory\"}";
\u3000\u3000
\u3000\u3000//\u5c06JSON\u6587\u672c\u8f6c\u6362\u4e3a\u5bf9\u8c61\uff0c\u5e76\u5c06\u4e00\u822c\u7c7b\u7684\u5b9e\u4f8b\u6539\u6210\u4f2a\u7c7b\u7684\u5b9e\u4f8b\u3002
\u3000\u3000var inventoryObject = JSON.parse(inventoryJSONText, function(key, value) {
\u3000\u3000var type;
\u3000\u3000if (value && typeof value === 'object') {
\u3000\u3000type = value.Type;
\u3000\u3000if (typeof type === 'string' && typeof window[type] === 'function') {
\u3000\u3000return new (window[type])(value);
\u3000\u3000}
\u3000\u3000}
\u3000\u3000return value;
\u3000\u3000});
\u3000\u3000
\u3000\u3000//\u8f93\u51fa\u8f6c\u6362\u540e\u5bf9\u8c61\u7684\u4fe1\u606f\u3002
\u3000\u3000var output = "Product\t\tQuantity\tPrice\tTotal\n";
\u3000\u3000for (var key in inventoryObject.Item) {
\u3000\u3000var item = inventoryObject.Item[key];
\u3000\u3000output += item.Product + "\t" + item.Quantity + "\t\t"
\u3000\u3000+ item.Price + "\t" + item.Total() + "\n";
\u3000\u3000}
\u3000\u3000output += "\t\t\t\t\t" + inventoryObject.Total();
\u3000\u3000alert(output);
\u3000\u3000
\u3000\u3000//\u518d\u5c06inventoryObject\u5bf9\u8c61\u8f6c\u6362\u6210JSON\u6587\u672c\u3002
\u3000\u3000var inventoryJSONTextAgain = JSON.stringify(inventoryObject, null, 3);
\u3000\u3000alert(inventoryJSONTextAgain);
\u3000\u3000

1.\u7b80\u5355\u7684\u89e3\u6790json\u5b57\u7b26\u4e32
\u9996\u5148\u5c06json\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3ajson\u5bf9\u8c61\uff0c\u7136\u540e\u518d\u89e3\u6790json\u5bf9\u8c61\uff0c\u8fc7\u7a0b\u5982\u4e0b\u3002
JSONObject jsonObject = JSONObject.fromObject(jsonStr);

[java] view plain copy


\u6839\u636ejson\u4e2d\u7684\u952e\u5f97\u5230\u5b83\u7684\u503c
String name = jsonObject.getString("name");
int num = jsonObject.getInt("num");
String sex = jsonObject.getString("sex");
int age = jsonObject.getInt("age");

2.\u5c06json\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3ajava\u5bf9\u8c61
\u540c\u6837\u5148\u5c06json\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3ajson\u5bf9\u8c61\uff0c\u518d\u5c06json\u5bf9\u8c61\u8f6c\u6362\u4e3ajava\u5bf9\u8c61\uff0c\u5982\u4e0b\u6240\u793a\u3002
JSONObject obj = new JSONObject().fromObject(jsonStr);//\u5c06json\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3ajson\u5bf9\u8c61

\u5c06json\u5bf9\u8c61\u8f6c\u6362\u4e3ajava\u5bf9\u8c61
Person jb = (Person)JSONObject.toBean(obj,Person.class);//\u5c06\u5efajson\u5bf9\u8c61\u8f6c\u6362\u4e3aPerson\u5bf9\u8c61

3.\u5c06java\u5bf9\u8c61\u8f6c\u6362\u4e3ajson\u5b57\u7b26\u4e32
\u5148\u5c06java\u5bf9\u8c61\u8f6c\u6362\u4e3ajson\u5bf9\u8c61\uff0c\u5728\u5c06json\u5bf9\u8c61\u8f6c\u6362\u4e3ajson\u5b57\u7b26\u4e32
JSONObject json = JSONObject.fromObject(obj);//\u5c06java\u5bf9\u8c61\u8f6c\u6362\u4e3ajson\u5bf9\u8c61

String str = json.toString();//\u5c06json\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32
\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\uff1a

[java] view plain copy
package baz.parse;

import java.util.ArrayList;
import java.util.List;

import net.sf.json.JSON;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import baz.bean.Person;

public class ParseJson {

private String jsonStr;

public ParseJson() {

}

1.简单的解析json字符串
首先将json字符串转换为json对象，然后再解析json对象，过程如下。
JSONObject jsonObject = JSONObject.fromObject(jsonStr);

[java] view plain copy
<pre></pre><span style="white-space:pre"></span>
<pre></pre>
根据json中的键得到它的值
String name = jsonObject.getString("name");
int num = jsonObject.getInt("num");
String sex = jsonObject.getString("sex");
int age = jsonObject.getInt("age");

2.将json字符串转换为java对象
同样先将json字符串转换为json对象，再将json对象转换为java对象，如下所示。
JSONObject obj = new JSONObject().fromObject(jsonStr);//将json字符串转换为json对象

将json对象转换为java对象
Person jb = (Person)JSONObject.toBean(obj,Person.class);//将建json对象转换为Person对象

3.将java对象转换为json字符串
先将java对象转换为json对象，在将json对象转换为json字符串
JSONObject json = JSONObject.fromObject(obj);//将java对象转换为json对象

String str = json.toString();//将json对象转换为字符串

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绛旓細Obj2str: function(o) { if (o == undefined) { return "";} var r = [];if (typeof o == "string") return "\"" + o.replace(/([\"\\])/g, "\\$1").replace(/(\n)/g, "\\n").replace(/(\r)/g, "\\r").replace(/(\t)/g, "\\t") + "\"";if (...

C#灏嗗凡缁杞崲濂界殑json瀵硅薄,鍐嶈浆鎹负瀛楃涓
绛旓細using System.Runtime.Serialization.Json;using System.Web.Script.Serialization;...public static string GetJson(object obj){ JavaScriptSerializer serializer = new JavaScriptSerializer();return serializer.Serialize(obj);}

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绛旓細json 瀛楃涓鎸囩殑灏辨槸 json 鏈韩锛岀敱浜 JavaScript 鏄急绫诲瀷璇█锛屾墍浠ユ病鏈夊姙娉曠洿鎺ヤ紶閫掑璞℃垨鏄暟缁勶紝鎵浠ユ彁鍑轰簡 json 鏍煎紡鐨勫瓧绗︿覆锛岀敤浜庢暟鎹紶閫;ajax 涓紝鎴戜滑鑷繁鎷兼帴鐨勬槸涓涓JSON瀵硅薄锛屽洜涓哄畠鏄棤鏁版嵁绫诲瀷鐨勶紝鎵浠 JS 鏍规嵁鍏舵牸寮忛粯璁ゅ叾鏄璞★紝瑕佹槸寰鍚庡彴鍙戯紝瑕佸厛鎶婂畠杞崲鎴 JSON瀛楃 銆備粠 ajax...

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绛旓細JSON.stringify 鎶婁竴涓瀵硅薄杞崲鎴恓son瀛楃涓 JSON.parse 鎶婁竴涓猨son瀛楃涓茶В鏋鎴愬璞 --- 鏃х増娴忚鍣ㄥ紩鍏 json2.js 鍙互鏀寔杩欎簺鏂规硶

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