1、参数与VO转换在使用Spring MVC进行参数接收的时候，不需要在参数前面追加什么特别多的标记，写的基本上都是属性名称。定义一个Emp程序类，把常用的几种数据类型都加上：package com.gwolf.vo;import java.io.Serializable;import java.util.Date;public class Emp implements Serializable{ private Integer empno; private String ename; private Double sal; private Date hiredate; public Integer getEmpno() { return empno; } public void setEmpno(Integer empno) { this.empno = empno; } public String getEname() { return ename; } public void setEname(String ename) { this.ename = ename; } public Double getSal() { return sal; } public void setSal(Double sal) { this.sal = sal; } public Date getHiredate() { return hiredate; } public void setHiredate(Date hiredate) { this.hiredate = hiredate; } }
2、那么这个时候如果希望通过SpringMV觊皱筠桡C自动实现参数的赋值操作。只需要在参数上做一个修改。package com.gwolf.acti泠贾高框on;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.servlet.ModelAndView;import com.gwolf.vo.Emp;@Controller@RequestMapping("/pages/emp/*")public class EmpAction { Logger logger = LoggerFactory.getLogger(this.getClass()); @RequestMapping("add") public ModelAndView add(Emp emp) { ModelAndView md = new ModelAndView("/pages/show.jsp"); System.out.println(emp); return md; } @RequestMapping("remove") public ModelAndView remove(int id) { ModelAndView md = new ModelAndView("/pages/show.jsp"); logger.info(id * 2 + "--------"); System.out.println(id * 2 + "--------"); return md; } @RequestMapping("list") public ModelAndView list(@RequestParam(value="cp",defaultValue="1") int currentPage, @RequestParam(value="ls",defaultValue="10") int lineSize, @RequestParam(value="col",defaultValue="ename") String colum, @RequestParam(value="kw",defaultValue="") String keyword) { ModelAndView md = new ModelAndView(); System.out.println("currentPage=" + currentPage); System.out.println("lineSize=" + lineSize); System.out.println("colum=" + colum); System.out.println("keyword=" + keyword); return md; } @RequestMapping("get") public ModelAndView doGet(int id,HttpServletRequest request, HttpServletResponse response) { ModelAndView md = new ModelAndView(); return md; } @RequestMapping("echo") public ModelAndView echo(String msg) { ModelAndView md = new ModelAndView("/pages/show.jsp"); md.addObject("info","Echo:" + msg); return md; }}
3、如果现在要进行日期的参数传递，往往需要有一个转换器来控制，这个转换器是一个公共的配置，从一般的开发角度来讲，所有的Action一定要去继承一个父类的Action，这样的好处可以做一些公共的设计。建立一个AbstractAction程序类，这个程序类里面定义有如下的一段代码。 @InitBinder public void initBinder(WebDataBinder binder) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //本方法的处理指的是添加一个自定义的转换编辑器，如果遇见的操作目标类型为java.util.Date类 //则使用定义好的SimpleDateFormat类来进行格式化处理，并且允许此参数的内容为空 binder.registerCustomEditor(java.util.Date.class, new CustomDateEditor(sdf, true)); }
4、在浏览器中访问地址：http://localhost:8080/SpringMVC/pages/emp/add.action?empno=10&ename=%E8%80%81%E6%9B%B9&sal=1.1&hiredate=1986-02-12%2020:12:12
5、但是很多时候有可能会出现参数嵌套的情况，例如：一个雇员属于一个部门，可能还会同张虢咆噘时传递部门信息。修改给定的VO类Emp类，同时追加一个Dept类。package com.gwo造婷用痃lf.vo;import java.io.Serializable;import java.util.Date;public class Emp implements Serializable{ private static final long serialVersionUID = -7762107227062576400L; private Integer empno; private String ename; private Double sal; private Date hiredate; private Dept dept; public Dept getDept() { return dept; } public void setDept(Dept dept) { this.dept = dept; } public Integer getEmpno() { return empno; } public void setEmpno(Integer empno) { this.empno = empno; } public String getEname() { return ename; } public void setEname(String ename) { this.ename = ename; } public Double getSal() { return sal; } public void setSal(Double sal) { this.sal = sal; } public Date getHiredate() { return hiredate; } public void setHiredate(Date hiredate) { this.hiredate = hiredate; } @Override public String toString() { return "Emp [empno=" + empno + ", ename=" + ename + ", sal=" + sal + ", hiredate=" + hiredate + "]"; }}
6、此时对于emp提交的时候可以传递dept的信息，请求路径：http://localhost:8080/SpringMVC/pages/emp/add.action?empno=10&ename=%E8%80%81%E6%9B%B9&sal=1.1&hiredate=1986-02-12%2020:12:12&dept.deptno=10&dept.dname=%E5%BC%80%E5%8F%91%E9%83%A8
