浅谈SpringMVC之request请求转发传递数据

SpringMVC默认的参数类型

SpringMVC底层是Servlet
HttpServletRequest、HttpServletResponse、HttpSession、Model、Map、ModelMap
注意：Model 、Map、ModelMap、request一样，都使用请求作用域进行数据传递。必须使用请求转发

通过作用域域传递数据

@Controller

public class DataForward {

    @RequestMapping("/data")

    public String dataF(HttpServletRequest request,

                        HttpServletResponse response,

                        HttpSession session,

                        Map map,

                        Model model,

                        ModelMap modelMap

                        ){

    User u1 =new User(01,"张三request");

    User u2 =new User(01,"张三session");

    User u3 =new User(01,"张三model");

    User u4 =new User(01,"张三map");

        User u5 =new User(01,"张三map");

        //向作用域存储数据

    request.setAttribute("user1",u1);

    session.setAttribute("user2",u2);

    model.addAttribute("user3",u3);

    map.put("user4",u4);

    modelMap.addAttribute("user5",u5);

        return "dataPage";

    }

}

dataPage.jsp

<%--//向作用域提取数据--%>

request:${user1.name}<br>

session:${user2.name}<br>

model:${user3.name}<br>

map:${user4.name}<br>

modelMap:${user5.name}<br>

Index.jsp -传递数据-> dataPage.jsp

index.jsp页面

<a href="${pageContext.request.contextPath}/data.action?name=老六">data</a>

dataPage.jsp页面

来自index.jsp页面的数据: ${param.name}

forEach标签案例

Servlet将集合放入request域
StaffDao mapper = sqlSessionAuto.getMapper(StaffDao.class);

List<Staff> staffs = mapper.selectALL();
//将查询结果放入请求域中
request.setAttribute("staffs",staffs);

Jsp页面

Foreach标签使用案例
<%--引入核心标签库--%>
<%@ taglib  prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>


<c:forEach items="${staffs}" var="s">
  <tr>
  <td>${s.id}</td>
  <td>${s.name}</td>
  <td>${s.diploma}</td>
  <td>${s.title}</td>
  <td>${s.marriage}</td>
  <td>${s.status}</td>
  <td>${s.workTime}</td>
  <td>
    <a href="javascript:void(0)" onclick="delect(${s.id})">删除</a>
    <a href="${pageContext.request.contextPath}/os/modify?id=${s.id}">修改</a>
    <a href="${pageContext.request.contextPath}/os/Payslips?id=${s.id}">工资条</a>
  </td>
  </tr>
</c:forEach>