action中json的应用
这篇文章重点介绍action中json数据的返回处理；如果需要看前端代码的一些特效或ajax的json接收，请看上一篇博客：http://blog.csdn.net/yangkai_hudong/article/details/24422817
1.需要依赖的方法
/**
* 获取PrintWriter
*
* @throws IOException
*/
public
static PrintWritergetPrintWriter(HttpServletResponse response)
throws IOException {
response.setContentType("text/plain;charset=utf-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Pragma",
"no-cache");
response.setHeader("Cache-Control",
"no-cache");
response.setDateHeader("Expires", 0);
PrintWriter out = response.getWriter();
return out;
}
/**
* 输出json操作
*
* @param out
* PrintWriter
* @param result
*/
public
voidresponseStr(PrintWriter out, String result) {
out.println(result);
out.flush();
out.close();
}
public String createJsonObject(Stringflag, String msg) {
JSONObject obj = new JSONObject();
try {
obj.put("flag", flag);
obj.put("msg", msg);
} catch (JSONException e) {
logger.error("生成JSON格式出错" + e);
obj.put("flag",
"0");
obj.put("msg",
"由于网络问题，数据处理失败");
} finally
{
return obj.toString();
}
}
2.action中的使用案例
public ActionForwardadd(ActionMapping mapping, ActionForm form, HttpServletRequest request,HttpServletResponse response)
throws IOException,AppException {
PrintWriter out = getPrintWriter(response);
String docTitle = Tool.getDefaultValue(request,
"docTitle", "");
String uid = Tool.getDefaultValue(request,
"uid", "");
try {
Long flag1 = WeiboWidgetDao.add(docTitle, uid);
Long flag2 = WeiboWidgetDao.addRel(docTitle, uid);
if (flag1 !=
null && flag2 != null) {
responseStr(out, createJsonObject("1",
"添加成功！"));
WeiboWidgetDao.updateCache("doc", docTitle);
// 更新词条缓存
} else {
responseStr(out, createJsonObject("0",
"添加词条微博失败！"));
}
} catch (Exception e) {
logger.debug("添加词条微博失败：" + e);
responseStr(out,createJsonObject("0",
"添加词条微博失败,发生异常！"));
}
return
null;
}
3.js中的使用案例
保存
function save() {
// 保存前验证
var docTitle = $("#win_docTitle").val();
var uid = $("#win_uid").val();
if (docTitle !=
"" && uid != "") {
$.ajax({
dataType: 'json',
type: 'POST',
url: '/weiboWidget.do',
data: {
'action' : $("#win_action").val(),
'id' : $("#win_id").val(),
'docTitle' : $("#win_docTitle").val(),
'uid' : $("#win_uid").val(),
},
success : function(data) {
if (data.flag == 1) {
alert(data.msg);
window.location.href=
"/weiboWidget.do?action=show";
}else {
alert(data.msg);
}
return
false;
},
error: function() {
alert("由于网络问题，保存数据失败！");
return
false;
}
});
}else {
alert("词条名和微博UID不能为空！");
return
false;
}
}
删除
/**
*
批量删除操作
*
*/
function deleteData() {
var idList =document.getElementsByName("id_list");
var ids =
"";
var docTitles =
"";
// 检查是否选择内容
for (i = 0; i < idList.length;i++) {
if(idList[i].checked) {
var temp =idList[i].value.split(";");
ids+= temp[0] +
",";
docTitles+= temp[1] +
",";
}
}
if (ids ==
"") {
alert("请选择纪录！");
}else {
$.post("/weiboWidget.do?action=delete&" +
new Date(), {
'ids' : ids,
'docTitles' : docTitles
},function(data) {
window.location.href=
"/weiboWidget.do?action=show";
return
false;
});
}
}
转载请指明：http://blog.csdn.net/yangkai_hudong