Struts2 后台Action接收POST请求JSON数据及其实现解析

红太狼 2022-05-10 20:28 250阅读 0赞

**一.数据表单**

<form id="messagePrioritySetting" name="messagePrioritySetting" method='post'>
    
    	<table class="table_gry" >
    		<tr>
    			<td width="50" height=22 class="column1">
    				<span>序号</span>
    			</td>
    			<td width="100" height=22 class="column1">
    				<span>消息类型</span>
    			</td>
    			<td width="50" height=22 class="column1">
    				<span>优先级</span>
    			</td>
    			<td width="100" height=22 class="column1">
    				<span>是否默认展开</span>
    			</td>
    		</tr>
    		<s:if test="#request.resultlist!=null">
    		  <tbody>
    			<s:iterator id="re" value="#request.resultlist" status="status">
    				<tr id="${ re.id}" name="${ re.id}" >
    					<td height="30" width="90px">
    						<input  type="hidden" name="id" value="${ re.id}" />
    						${status.index+1}
    					</td>  
    					<td height="30" width="270">
    						${re.messageTypeValue }
    					</td>
    					<td id="priorityLevel" title="单击修改优先级别!"  class="selected" 
    						style="width: 120px" >
    					   ${re.priorityLevel }
    					</td>
    					<td height="30" width="20">
    						<select style="width:65px;" id="isPushed" name="expandStatus">
    							<c:if test="${re.expandStatus == '0'}">  
    								<option value="0" selected="selected">
    									是
    								</option>
    								<option value="1">
    									否
    								</option>
    							</c:if>
    							<c:if test="${re.expandStatus == '1'}">  
    								<option value="0" >
    									是
    								</option>
    								<option value="1" selected="selected">
    									否
    								</option>
    							</c:if>
    						</select>
    					</td>
    				</tr>
    			</s:iterator>
    		  </tbody>
    		</s:if>
    	</table>
    	</div>
    	 
    	<div align="center">
    		<button class="btn_handle" onclick="saveOrUpdate()">提交</button>
    	</div>
    </form>

**二.将整个表单中的数据封装成json格式**

**三.后台对前端传递的json数据进行接收**

public void messageSettingAll() throws IOException{
         String mpsStr = getRequestPostData(request);
    	// 转化为json对象
        JSONObject mpsObject = JSONObject.parseObject(mpsStr);
    	// 通过key获取value
        String jsonString = mpsObject.getString("menu");
    	// 转化为实体类对象
        List<MessagePushSetting> messagePushSettingList = JSON.parseArray(jsonString,
     	MessagePushSetting.class);
    
    }
    
       //解析请求的Json数据
        private String getRequestPostData(HttpServletRequest request) throws IOException {
            int contentLength = request.getContentLength();
            if(contentLength<0){
                return null;
            }
            byte buffer[] = new byte[contentLength];
            for (int i = 0; i < contentLength;) {
                int len = request.getInputStream().read(buffer, i, contentLength - i);
                if (len == -1) {
                    break;
                }
                i += len;
            }
            return new String(buffer, "utf-8");
        }