springMVC自动封装对象

springMVC自动获取jsp页面input中的值，封装成对象传入后台

最近做公司的项目，项目采用的是ssm框架，发现后台在采集jsp页面表单里面的数据时没有用到传统的request.getParameter()，而是在controller的传入参数多了几个对象。因此发现springMVC的这个功能。

具体例子如下所示：

建立一个jsp页面vacate.jsp

后台接受的controller代码：

 import java.util.Map;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.servlet.ModelAndView;

 import com.zyl.nonglin.base.BaseController;
 import com.zyl.nonglin.base.entity.Vacate;

 @Controller
 @RequestMapping(value="/admin/qingjia")
 public class VacateController extends BaseController{

     /**
      * 跳转到请假页面
      * @param req
      * @param resp
      * @return
      */
     @RequestMapping(value="/toVacate")
     public ModelAndView toVacate(HttpServletRequest req,HttpServletResponse resp){
         Map context = getRootMap();
         return forword("/qingjia/vacate", context);
     }
     /**
      * 提交请假信息
      * @param vacate
      * @param req
      * @param resp
      */
     @RequestMapping(value="/addVacate")
     public void addVacate(Vacate vacate,HttpServletRequest req,HttpServletResponse resp){
         System.out.println(vacate.getClassNum());//
         System.out.println(vacate.getReason());
         System.out.println(vacate.getsName());
         System.out.println(vacate.getsNum());
         System.out.println(vacate.getsPhone());
     }
 }

Vacate实体类

 /**
  * 请假信息类
  * @author
  *
  */
 public class Vacate {

     private String id;
     private String sNum;//学生学号
     private String sName;//学生姓名
     private String classNum;//班级编号
     private String ctime;//请假时间
     private String sPhone;//学生电话
     private String reason;//理由
     public String getId() {
         return id;
     }
     public void setId(String id) {
         this.id = id;
     }
     public String getsNum() {
         return sNum;
     }
     public void setsNum(String sNum) {
         this.sNum = sNum;
     }
     public String getsName() {
         return sName;
     }
     public void setsName(String sName) {
         this.sName = sName;
     }
     public String getClassNum() {
         return classNum;
     }
     public void setClassNum(String classNum) {
         this.classNum = classNum;
     }
     public String getCtime() {
         return ctime;
     }
     public void setCtime(String ctime) {
         this.ctime = ctime;
     }
     public String getsPhone() {
         return sPhone;
     }
     public void setsPhone(String sPhone) {
         this.sPhone = sPhone;
     }
     public String getReason() {
         return reason;
     }
     public void setReason(String reason) {
         this.reason = reason;
     }


 }

前端页面样式：

提交后可以看到控制台输出：