jsp的＜a＞超连接传值

目录

jsp部分摘要

Servlet部分摘要

CommunityEventRegistrationService

CommunityEventRegistrationDao

---

jsp部分摘要

<c:forEach items="${sessionScope.CommunityEventRegistrationList}" var="cer">
    <form class="form-horizontal" action="/CommunityEventRegistrationDelete" method="post"> 
        <a class="btn btn-danger" href="/CommunityEventRegistrationDelete?id=1&username=${cer.username }">
        删除
        </a>
    </form>
</c:forEach>

其中href="/CommunityEventRegistrationDelete?id=1&username=${cer.username }"

CommunityEventRegistrationDelete为指向的Servlet

传两个值，一个是id，一个是username。【这里展示的是两种不同形式】

Servlet部分摘要

int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("username");
 
 
boolean isSuccess = cerService.update(communityeventregistration,s1.substring(7),id,name);
if(isSuccess) {
    request.setAttribute("msg", "删除成功！可刷新查看！");
}else {
    request.setAttribute("failMsg", "删除失败！");
}

jsp传值过来后，Servlet就用request.getParameter("？？？")；来接收

然后id,name可以这样

boolean isSuccess = cerService.update(communityeventregistration,s1.substring(7),id,name);

塞在后面，传值进Service类使用方法进入后续操作

CommunityEventRegistrationService

public class CommunityEventRegistrationService{
    private CommunityEventRegistrationDao cerDao = new CommunityEventRegistrationDao();
    public boolean update(CommunityEventRegistration communityeventregistration,String phone,int id,String name) {
        try {
            cerDao.update(communityeventregistration, phone, id, name);
            return true;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
    }
}

CommunityEventRegistrationDao

public class CommunityEventRegistrationDao {
    public void update(CommunityEventRegistration communityeventregistration, String phone,int id, String username) throws SQLException {
        QueryRunner r = new QueryRunner(DataSourceUtils.getDataSource());
        System.out.println("update在此1");
        if(id==1){
            System.out.println("update在此2");
            String sql = "update `communityeventregistration` set yoga='-----' where phone = ? and username=? and yoga= '√'";
            r.update(sql,phone,username);
        }
    }
}