SpringMVC中输出json

// 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;