向服务器发送json格式字符串

package common.util;import java.io.IOException;import javax.faces.context.ExternalContext;import javax.faces.context.FacesContext;public class ExternalContextUtil {public static void responseToMobile(String josnString){FacesContext facesContext = FacesContext.getCurrentInstance();ExternalContext externalContext = facesContext.getExternalContext();externalContext.setResponseContentType("application/json");externalContext.setResponseCharacterEncoding("UTF-8");// 写入josn格式数据try {externalContext.getResponseOutputWriter().write(josnString);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}facesContext.responseComplete();}}