SpringMVC 中，當前台傳入多個參數時，可將參數封裝成一個bean類

在實際業務場景中，當前台通過 url 向后台傳送多個參數時，可以將參數封裝成一個bean類，在bean類中對各個參數進行非空，默認值等的設置。

前台 url ，想后台傳送兩個參數，userName 和 password：

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

將參數封裝成bean 類，並在bean類中對參數進行控制：

 
 
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、打印及去除當前傳入的參數：

    @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();
    }