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<String,Object> 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());
	}
}

/**
 * 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;
	}
	
	
}

提交后可以看到控制台输出：