javaee前后台之间传值的几种方式

java前后台之间传值的几种方式

      

自己写的代码太少，有时候前后台传值还写的不是很熟练，现在总结一下，加深下印象。

1.jquery的Ajax传值

----》前台到后台

期望功能：把前台用户输入的信息保存在数据库里。

前台jsp代码：

function saveUserInfo(){

  var params = {};//定义一个数组

  var userNO =jq("#userNO").val();//把前台页面上的值都赋予一个变量
  var userName =jq("#userName").val();
  var phoneNumber =jq("#phoneNumber").val();

  params["userNO"] = userNO;//把这些变量都存在这个数组里
  params["userName"] =userName;
  params["phoneNumber"] =phoneNumber;

  jq.ajax({
       type :"post",
        url: "<%=basePath%>personalSetting/personalSettingSaveAll.do",//找到action里相应的方法
        data:params, //把数组的值赋给data，把上面的param改为data,这里就能直接去掉
        dataType: "text",//根据数据类型选择text、jason等
        success: function(data) { 
          alert(msg);//msg可以在后台Action配置，也可以在这里直接写提示信息
        },
       error: function(data) {
        alert("msg");
       }
      });
       } 
 }

后台Action代码：

@SuppressWarnings({ "unchecked", "unused", "rawtypes" })
@RequestMapping(value = "/personalSetting/personalSettingSaveAll.do",method = RequestMethod.POST)
public void saveAll(ModelMap model, HttpServletRequest request,HttpServletResponse response) throws Exception {
   response.setCharacterEncoding("UTF-8");
    HttpSessionsession = request.getSession();
    StringuserNO  = request.getParameter("userNO")+"";
    StringuserName = request.getParameter("userName")+"";
    StringphoneNumber =request.getParameter("phoneNumber")+"";     
    PersonalSettingEntitypSE = new PersonalSettingEntity(); 
    if(!("".equals(userNO))||"".equals(userName)||"".equals(phoneNumber))){ //如果都不为空  

       pSE.setUserNO(userNO);
       pSE.setUserName(userName);
       pSE.setPhoneNumber(phoneNumber);
       PersonSettingService.saveProcessSetting(pSE);
       msg = "保存成功";
    }else{
       msg ="填写不完整"; //可以在前台校验，这里为了举例子
    }
       response.getWriter().print(msg);//这里的msg是text数据，所以前台数据类型是text。
}

 

----》后台到前台

期望功能：把数据库里的用户信息显示到前台页面。

后台Action代码：

@SuppressWarnings({ "unchecked", "unused", "rawtypes" })
@RequestMapping(value = "/personalSetting/personalSettingInitAll.do", method= RequestMethod.POST)
public void qureyAll(ModelMap model, HttpServletRequest request,HttpServletResponse response) throws Exception {
   response.setCharacterEncoding("UTF-8");
    HttpSessionsession = request.getSession();
    StringuserId =request.getSession().getAttribute("currentUserId").toString();
   PersonalSettingEntity pSE =PersonSettingService.getPersonalSetting(Long.valueOf(userId));    
    response.getWriter().print(JSONArray.fromObject(pSE).toString());
}

 

前台jsp代码：

function get(){ 
  jq.ajax({
        type : "post",
        url : "<%=basePath%>personalSetting/personalSettingInitAll.do",
        dataType : "json",
        success :function (data) {
         var bean;
         jq.each(data,function(index){
          bean= data[index];
          jq("#userNO").attr("value",bean.userNO);
          jq("#userName").attr("value",bean.userName); 
          jq("#phoneNumber").attr("value",bean.phoneNumber);
           }                  
        },
        error :function (data){
           alert("系统出错！");
        }
  });  
 }