Ajax跨域请求失败

$.ajax({
type:'post',
url:'delete.action',//${basePath}/back/user/
data:data+'&ajax=1',
dataType:'text',
success:function(msg){
if(msg =="true"){
alert("删除成功！");
}else{
alert("删除失败！");
}
},
error:function(){
alert("连接网络失败，请您检查您的网络！");
}
});

/**
* 返回Ajax响应字符串，将处理结果返回
*/
public void sendAjaxResponse(String message) {
try {
response.setCharacterEncoding("UTF-8");
response.setContentType("text/json");
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
log.debug("-------------------响应String数据---------------------\n"+message+"\n----------------------------------------------");
//getResponse().addHeader("Content-Length", message.getBytes("UTF-8").length+"");
response.getWriter().print(message);
} catch (IOException e) {
e.printStackTrace();
}
}