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！");

}

});

}