接收请求参数

 

spring接收请求参数:

1,使用HttpServletRequest获取

@RequestMapping("/login.do")

public String login(HttpServletRequest request){

  String name = request.getParameter("name")

  String pass = request.getParameter("pass")

}

 2,Spring会自动将表单参数注入到方法参数，和表单的name属性保持一致。和Struts2一样

?

@RequestMapping("/login.do")

public String login(HttpServletRequest request,

                String name,

 @RequestParam("pass")String password) // 表单属性是pass,用变量password接收

{

  syso(name);

  syso(password)

}

3,自动注入Bean属性 

jsp页面：

<form action="login.do">

用户名：<input name="name"/>

密码：<input name="pass"/>

<input type="submit" value="登陆">

</form>

  

java 实体类

//封装的User类

public class User{

 private String name;

 private String pass;

}

 

controller java代码

@RequestMapping("/login.do")

public String login(User user)

{

  syso(user.getName());

  syso(user.getPass());

}

4.@RequestParam： 请求参数规则注解。 value属性匹配前台传递的参数(一个参数时默认)，required属性此字段是否必须传值(boolean，默认为true)，defaultValue此参数的默认值(存在此参数时，说明前台不必需传递参数，required为false) 

@RequestMapping("/login")  //url: /login?name=tom

   public String login(@RequestParam(value="age",required=false,defaultValue="24") String agenum,@RequestParam("name") String name){

       return "hello";

   }

 

 

5.@PathVariable: url参数注解， 一般用于从url中获取参数

@RequestMapping(value = "/system/getAllCodeTableData/{category}", method = RequestMethod.GET) 

//前台url： '/system/getAllCodeTableData/APPLICANT_ENGLISH'

public List<CodeTableModel> getCodeTableModelByCategory(@PathVariable String category) throws OTPException {　　　

　return codeTableService.getCodeTableModelByCategory(category);

}

  6. @ModelAttribute 传递实体对象

@RequestMapping("hello")

 public String Hello(@ModelAttribute("user") User user)

 {

   System.out.println(user.getUserName());

  return "hello";

 }

public class User {

 

 private int userID;

 private String userName;

 public int getUserID() {

  return userID;

 }

 public void setUserID(int userID) {

  this.userID = userID;

 }

 public String getUserName() {

  return userName;

 }

 public void setUserName(String userName) {

  this.userName = userName;

 }

}

 

请求地址如：/test/hello?userID=12&userName=sdfsd 或者ajax提交 data={userId:1,userName:asdf}

7.@RequestBody

@RequestBody接收的是一个Json对象的字符串，而不是一个Json对象。

然而在ajax请求往往传的都是Json对象，用 JSON.stringify(data)的方式就能将对象变成字符串。

同时ajax请求的时候也要指定dataType: "json",contentType:"application/json" 这样就可以轻易的将一个对象或者List传到Java端！

js代码

function updateFansList(fansArr) {
    if (fansArr) {
        var datas = formatObj(fansArr);
        $.ajax({
            type: "POST",
            url: "./windfarmplan/tbUserProject/updateFansList",
            dataType: "json",
            contentType: "application/json",
            data: JSON.stringify(datas),
            success: function (result) {
                console.log(result);
            }
        });
    }
}

function formatObj(fansArr) {
    var datas = [];
    console.log(fansArr);
    for (var i = 0; i < fansArr.length; i++) {
        var fan = fansArr[i];
        var data = {};
        data.key = fan.key;
        data.lon = fan.lon;
        data.lat = fan.lat;
        data.fjNo = fan.fjNo;
        data.towerItem = fan.towerItem;
        data.fanTypeId = fan.fanTypeId;
        data.selectFanTypeId = fan.selectFanTypeId;
        data.windSpeed = fan.windSpeed;
        data.airDensity = fan.airDensity;
        data.annualPowerGeneration = fan.annualPowerGeneration;
        data.fullLoadHours = fan.fullLoadHours;
        data.theoryPower = fan.theoryPower;
        data.price = fan.price;
        data.lnglatId = fan.lnglatId;
        data.height =fan.height;
        data.weibullK = fan.weibullK;
        data.towerHeight = parseFloat(fan.selectFanTypeId.split("-")[2]);
        data.province = fan.province;
        data.city = fan.city;
        data.area = fan.area;
        
        datas.push(data);
    }
    return datas;
}

java 代码：

@ResponseBody
@RequestMapping("/updateFansList")
public ReturnData updateFansList(@RequestBody List<TbUserProjectFans> fansList) {
    ReturnData returnData = new ReturnData(Boolean.TRUE);
    boolean flag = customUserProjectService.updateFansList(fansList);
    if(!flag){
        returnData.setSucc(Boolean.FALSE);
        returnData.setMessage("保存风机数据失败！");
    }
    return returnData;
}

 

} ?