response 工具类 防止乱码

package com.yf.util;

import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * HttpServletResponse帮助类
 */
public final class ResponseUtils {
    public static final Logger log = LoggerFactory
            .getLogger(ResponseUtils.class);

    /**
     * 发送文本。使用UTF-8编码。
     * 
     * @param response
     *            HttpServletResponse
     * @param text
     *            发送的字符串
     */
    public static void renderText(HttpServletResponse response, String text) {
        render(response, "text/plain;charset=UTF-8", text);
    }

    /**
     * 发送json。使用UTF-8编码。
     * 
     * @param response
     *            HttpServletResponse
     * @param text
     *            发送的字符串
     */
    public static void renderJson(HttpServletResponse response, String text) {
        render(response, "application/json;charset=UTF-8", text);
    }

    /**
     * 发送xml。使用UTF-8编码。
     * 
     * @param response
     *            HttpServletResponse
     * @param text
     *            发送的字符串
     */
    public static void renderXml(HttpServletResponse response, String text) {
        render(response, "text/xml;charset=UTF-8", text);
    }

    /**
     * 发送内容。使用UTF-8编码。
     * 
     * @param response
     * @param contentType
     * @param text
     */
    public static void render(HttpServletResponse response, String contentType,
            String text) {
        response.setContentType(contentType);
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("access-control-allow-methods", "POST, GET,HEAD, OPTIONS,PATCH, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "cache-control,content-type,hash-referer,x-requested-with,Authorization");
        response.setHeader("access-control-allow-credentials", "true");
        try {
            response.getWriter().write(text);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        }
    }
    
}