调用ajax返回json的另一种用法

1.页面代码

div id="commenthtml" style="display:none;">
                <div class="form_box">
                            <div class="form_row">
                                <div class="form_label"><label>专辑名称：</label></div>
                                <div class="form_field"><input type="text"  id="albumName" name="albumName"  value="" maxlength="30"/></div>
                            </div>
                            <div class="form_row">
                                <div class="form_label"><label>描&nbsp;&nbsp;&nbsp;&nbsp;述：</label></div>
                                <div class="form_field"><textarea title="字数不超过200个字符" id="albumDesc" name="albumDesc" onKeyDown="LimitTextArea(this)" onKeyUp="LimitTextArea(this)" onkeypress="LimitTextArea(this)"></textarea></div>
                            </div>
                            <div class="form_row">
                                <div class="form_label"></div>
                                <div class="form_field">
                                    <span class="btn_a"><input type="button" name="saveAlbum" id="saveAlbum"  onclick="submitAlbum(this.form);" value="创建"/></span>
                                    <span class="btn_a"><input type="button" id="cancelBtn" value="取消"/></span>
                                </div>
                            </div>
                </div>
</div>

调用ajax

function submitAlbum(form){
    var  albumName = $("#albumName").val();
    var  albumDesc = $("#albumDesc").val();
   if(albumName == ""){
        alert('提示:专辑不能为空!');
        return false;
   }
   if(albumDesc == ""){
        alert('提示:专辑描述不能为空!');
        return false;
   }
   $.ajax({
           type: "POST",
           url: "/enterprisercenter/saveAlbum.action",
           data: "tpId=1013&enterPriserAlbum.albumName=" + albumName +"&enterPriserAlbum.albumDesc=" + albumDesc,
           dataType:'json',
           success: function(json){
           		if (json.op=='succ'){
           			alert("操作成功");
           			window.location.reload();
           		}else if (json.op=='hasDiscard'){
           			alert(json.msg);
           			$("#" + json.code).focus();
           		}else{
           			alert(json.msg);
           		}
           }
        });
 }

action 代码:

  //保存相册
    public void saveAlbum() throws IOException{
        try {
        	if (FilterDiscard.hasDiscard(enterPriserAlbum.getAlbumName(),true)) {
        		getJsonHelper().fail("hasDiscard", "提示：名称中有非法字符!").set("code", "albumName").write();
        		return;
        	}
        	if (FilterDiscard.hasDiscard(enterPriserAlbum.getAlbumDesc(),true)) {
        		getJsonHelper().fail("hasDiscard", "提示：描述中有非法字符!").set("code", "albumDesc").write();
        		return;
        	}
            enterPriserAlbum.setAlbumUserid(this.getSessionUser().getUserId()+"");
            enterPriserAlbum.setCreateDate(DateTimeUtils.parseFullDateTime(DateTimeUtils.getDateTime()));
            enterPriserAlbum.setUpdateDate(DateTimeUtils.parseFullDateTime(DateTimeUtils.getDateTime()));
            enterPriserAlbum.setAlbumLogUrl("http://img1.woyopic.com/2010/0826/332/1-3bce7d978f54630889d0dd0310478dda.jpg");
            enterPriserPhotoService.addEnterPriserAlbum(enterPriserAlbum);
            getUser();
            getJsonHelper().succ().write();
        }catch(Exception ex) {
        	getJsonHelper().fail("操作失败!").write();
            ex.printStackTrace();
        }
        //return "personalAlbum";
        
    }

JsonHelper类代码:

import java.io.IOException;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.struts2.ServletActionContext;

/**
 * 输出的帮助类 作用：封装控制器中json的使用， 用法如下：
 * 基础功能 set("chargeType", "1"); //设置json的值 add("list", "value1"); //添加值 write();
 * //输出 disableCache(); //清缓存
 * 组合使用 set("chargeType", "1").set("count", 5).add("list",
 * "value1").add("list","value2").succ().write();
 * 同时作注释 return getJsonHelper() //设置id .set("id", model.getId()) 
   //设置 列表
 * .set("list", configService.getList(model.getType())) // 设置 当前用户
 * .set("userId", passportService.getCurrentUserId()) // 结果列表'list' .add("list",
 * "value1") .add("list","value2") // 清缓存 .disableCache().succ().write();
 * @author  
*/
public class JsonHelper {
    private static final long serialVersionUID = -1531331734713947690L;
    protected JSONObject root = new JSONObject(false);
    /**
     * 取得输出对象JSON(Dto)
     * 
     * @return
     */
    public JSONObject getJson() {
        return root;
    }

    /**
     * 禁止缓存
     * @return
     */
    public JsonHelper disableCache() {
        HttpServletResponse res = ServletActionContext.getResponse();
        res.setContentType("text/html;charset=UTF-8");
//        res.setHeader("Cache-Control","no-cache"); //Forces caches to obtain a new copy of the page from the origin server
//        res.setHeader("Cache-Control","no-store"); //Directs caches not to store the page under any circumstance
//        res.setDateHeader("Expires", 0); //Causes the proxy cache to see the page as "stale"
//        res.setHeader("Pragma","no-cache"); //HTTP 1.0 backward compatibility
        return this;
    }

    /**
     * 设值
     * 
     * @param key
     * @param value
     * @return
     */
    public JsonHelper set(String key, Object value) {
        return put(key, value);
    }
    public JsonHelper put(String key, Object value) {
        root.put(key, value);
        return this;
    }
    /**
     * 以数组形式在指定位置添加数据 即 JsonHelper() .add("list", "abc") .add("list", "bcd")
     * .add("list", "cde");
     * 
     * 等价于 JSONArray array = new JSONArray(); array.add("abc");
     * array.add("bcd"); array.add("cde"); JsonHelper().set("list", array);
     * 
     * 暂不支持子路径 即 add("max.list", "abc") 将会保存到
     * JsonHelper().getJson().get("max.list") 而不是
     * JsonHelper().getJson().get("max").get("list")
     * 
     * @param key
     * @param value
     * @return
     */
    public JsonHelper add(String key, Object value) {
        Object j = root.get(key);
        if (j == null) {
            root.put(key, new JSONArray());
            j = root.get(key);
        }
        if (j instanceof JSONArray) {
            ((JSONArray) j).add(value);
            return this;
        }
        throw new RuntimeException("已经设值，且不是数组");
    }

    /**
     * 快速设置成功页 效果 json.put("op", "succ");
     * 
     * @return
     */
    public JsonHelper succ() {
        root.put("op", "succ");
        return this;
    }

    /**
     * 快速设置失败页，由于‘不成功’就表示‘失败’，所以此方法一般不需调用， 除非需要指定失败类型（或提示语句）
     * 
     * @param msg
     * @return
     */
    public JsonHelper fail(String msg) {
        root.remove("op");
        root.put("msg", msg);
        return this;
    }
    public JsonHelper fail(String op, String msg) {
        root.put("op", op);
        root.put("msg", msg);
        return this;
    }

    /**
     * 输出json，所用数据从json中取
     * 
     * @return
     */
    public String write() {
        HttpServletResponse res = ServletActionContext.getResponse();
        res.setCharacterEncoding("UTF-8");
//        res.setContentType("application/json");
        try {
            res.getWriter().print(root.toString());
            return null;
        } catch (IOException e) {
            throw new RuntimeException("", e);
        }
    }

    public String toString() {
        return root.toString();
    }
}

struts.xml代码

 <!-- 保存相册-->
        <action name="saveAlbum" class="com.woyo.business.enterprisercenter.representation.action.EnterPriserAlbumAction" method="saveAlbum">
            <interceptor-ref name="MastLoginWebStack"/>
<!--           <result name="personalAlbum" type="redirectAction">personalAlbum?tpId=1011</result>-->
        </action>