SpringMVC 中，当前台传入多个参数时，可将参数封装成一个bean类

在实际业务场景中，当前台通过 url 向后台传送多个参数时，可以将参数封装成一个bean类，在bean类中对各个参数进行非空，默认值等的设置。

前台 url ，想后台传送两个参数，userName 和 password：

http://localhost:8082/web/baseAction.do?pathVar=app/task/fetchItemDetail.do?userName=123&password=123

将参数封装成bean 类，并在bean类中对参数进行控制：

 import org.hibernate.validator.constraints.NotEmpty;

 /**
  * Created by thinkpad on 2017/10/23.
  */
 public class QueryCondition {

     @NotEmpty(message = "validator.userName")
     private String userName ;
     private String password;

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public String getPassword() {
         if (null == password || password.length() == 0){
             password = "123456";
         }
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }
 }

　　　　controller 中的接收、打印及去除当前传入的参数：

    @RequestMapping("/fetchItemDetail.do")
    @ResponseBody
    public String fetchItemDetail(QueryCondition condition) {
        JSONObject json = new JSONObject();
        System.out.println(ReflectionToStringBuilder.toString(condition, ToStringStyle.MULTI_LINE_STYLE));
        System.out.println("conditionUserName = [" + condition.getUserName() + "], " +
                "conditionPassword = [" + condition.getPassword() + "]");
        return json.toJSONString();
    }