json与string的前台后台相互转换

一.前台转换

1.将json对象转为字符串：var obj ={}; obj.pro1='11111'; obj.pro2='22222'; var str = JSON.stringify(obj);console.info(str);

2.将字符串转为json对象： var obj = JSON.parse(str);console.info(str); 非严格可用 eval(str);

二.后台转换（com.alibaba.fastjson.JSON 部分详见JSON.java）

<span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">import</span></span><span style="font-size:13px"> com.alibaba.fastjson.JSON;

</span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Object</span></span><span style="font-size:13px"> parse(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> text); </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">// 把JSON文本parse为JSONObject或者JSONArray
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> JSONObject parseObject(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> text)； </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">// 把JSON文本parse成JSONObject
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> <T> T parseObject(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> text, </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Class</span></span><span style="font-size:13px"><T> clazz); </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">// 把JSON文本parse为JavaBean
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> JSONArray parseArray(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> text); </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">// 把JSON文本parse成JSONArray
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> <T> List<T> parseArray(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> text, </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Class</span></span><span style="font-size:13px"><T> clazz); </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">//把JSON文本parse成JavaBean集合
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> toJSONString(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Object</span></span><span style="font-size:13px"> object); </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">// 将JavaBean序列化为JSON文本
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">String</span></span><span style="font-size:13px"> toJSONString(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Object</span></span><span style="font-size:13px"> object, </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">boolean</span></span><span style="font-size:13px"> prettyFormat); </span><span class="code-comment" style="background-color:inherit"><span style="font-size:13px">// 将JavaBean序列化为带格式的JSON文本
</span></span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">public</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">static</span></span><span style="font-size:13px"> </span><span class="code-keyword" style="background-color:inherit"><span style="font-size:13px">final</span></span><span style="font-size:13px"> </span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Object</span></span><span style="font-size:13px"> toJSON(</span><span class="code-object" style="background-color:inherit"><span style="font-size:13px">Object</span></span><span style="font-size:13px"> javaObject); 将JavaBean转换为JSONObject或者JSONArray。</span>

等。

public static String getJsonString(Object obj){
       return JSON.toJSONStringWithDateFormat(obj, "yyyy-MM-dd HH:mm:ss");
   }

   public static List parseArray(String listString,Class c){
       if(StringUtils.isNotBlank(listString))
           return JSON.parseArray(listString, c);
       else
           return null;
   }
    写出：
   public static String writeJsonObj(Object obj,HttpServletResponse response) throws IOException{
       response.setCharacterEncoding("UTF-8");
       response.setContentType("text/html;charset=utf-8");
       String json = JSON.toJSONStringWithDateFormat(obj, "yyyy-MM-dd HH:mm:ss");
       json = json.replaceAll("\t", "");
       response.getWriter().write(json);
       response.getWriter().flush();
       response.getWriter().close();
       return null;
   }

json与string的前台后台相互转换

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