SpringMVC中输出json

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// header 常量定义
   private static final String DEFAULT_ENCODING = "GBK";
   private static final boolean DEFAULT_NOCACHE = true;
   // Content Type 常量定义
   public static final String TEXT_TYPE = "text/plain";
   public static final String JSON_TYPE = "application/json";
   public static final String XML_TYPE = "text/xml";
   public static final String HTML_TYPE = "text/html";
   public static final String JS_TYPE = "text/javascript";
   public static final String EXCEL_TYPE = "application/vnd.ms-excel";
   public static int PAGE_NUMERIC = 10;

protected HttpServletResponse initResponseHeader(final String contentType,

           final HttpServletResponse response) {
       // 分析headers参数
       String encoding = DEFAULT_ENCODING;
       boolean noCache = DEFAULT_NOCACHE;
       // 设置headers参数
       String fullContentType = contentType + ";charset=" + encoding;
       response.setContentType(fullContentType);
       if (noCache) {
           setNoCacheHeader(response);
       }

       return response;
   }

/**
   * 直接输出内容的简便函数.
   */
   protected void render(final String contentType, final String content,
           final HttpServletResponse response) {
       HttpServletResponse resp = initResponseHeader(contentType, response);
       try {
           resp.getWriter().write(content);
           resp.getWriter().flush();
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

/**
   * 输出JSON,可以接收参数如： [{'name':'www'},{'name':'www'}],['a','b'],new
   * String[]{'a','b'},合并如下：jsonString = "{TOTALCOUNT:" + totalCount + ",
   * ROOT:" + jsonString + "}";
   *
   * @param jsonString
   *            json字符串.
   *
   */
   protected void outJson(final String json, final HttpServletResponse response) {
       render(JSON_TYPE, json, response);
   }

String json = JSONObject.fromObject(map).toString();
outJson(json, response);
return;

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