如何通过一个JSP数组列表而不JSTL迭代 [英] How to iterate through an array list on a JSP without JSTL

问题描述

//我已经取回从MySQL一个结果，创造和。我已经在传这//美国呃数组列表，把它通过请求响应对象数组列表的用户。现在我需要显示ITON //小号JSP页面。
//1.Without JSTL
//2.With JSTL

//I have retrieved a Result from MySQL and created and Array-list User .i have sent this //US er Array-list in and sent it through request Response Object. Now i need to display iton //s JSP page. //1.Without JSTL //2.With JSTL

//表的名字是user_reg它有四个字段ID，用户名，密码，电子邮件。
//请你举例说明。我需要dispay所有字段在JSP页面中。但我不想//做在JSP中的JDBC工作

//The Name of table is user_reg it has four fields id,username,password,email. //please do explain with example. i need to dispay all fields in a jsp page. but i dont want //to do the jdbc work on the JSP

 package kinder.dto;

    public class User {
        private String id;

    private String userName;
    private String saltedkey;
    private String emailId;
    private String legalName;

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getLegalName() {
        return legalName;
    }
    public void setLegalName(String legalName) {
        this.legalName = legalName;
    }
    public String getEmailId() {
        return email;
    }enter code here`
    public void setEmailId(String emailId) {
        this.emailId = emailId;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return saltedkey;
    }
    public void setPassword(String password) {
        this.saltedkey = password;
    }




    }


    //dto

     package kinder.dto;

    public class User {
        private String id;

    private String userName;
    private String saltedkey;
    private String emailId;
    private String legalName;

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getLegalName() {
        return legalName;
    }
    public void setLegalName(String legalName) {
        this.legalName = legalName;
    }
    public String getEmailId() {
        return emailId;
    }
    public void setEmailId(String emailId) {
        this.emailId = emailId;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return saltedkey;
    }
    public void setPassword(String password) {
        this.saltedkey = password;
    }

}

// servlet的

//servlet

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {
            List<User> users = UserDAO.list();
            request.setAttribute("users", users); // Will be available as ${products} in JSP
            request.getRequestDispatcher("loginSuccess.jsp").forward(request, response);
        } catch (SQLException | ClassNotFoundException e) {
            throw new ServletException("Cannot obtain products from DB", e);
        }
    }

//如何得到这个在JSP页面

//how to get this in a JSP page

推荐答案

您需要创建一个POJO类

With JSTL

You need to create POJO class

class UserReg {
  private Integer id;
  private String userName;
  private String password;
  private String email;
  //getters and setters
}

的Servlet

需要改变列表填充逻辑

Servlet

Need to change list population logic

//code.....
ResultSet rs = ...;

ArrayList<UserReg> usersList = new ArrayList<UserReg>();

while(rs.next()) {       
   //here create new object of UserReg for each row
   UserReg user = new UserReg();
   user.setId(rs.getInt(0));
   // do it for userName, password, email
   .....
   .....
   ....
   // last add to list
   usersList.add(user);
}  
//set list in request scope and forward request to JSP
request.setAttribute("usersList",usersList);

JSP

<c:forEach var="user" items="usersList">
   <c:out value="${user.id}" />
   <c:out value="${user.userName}" />
   <c:out value="${user.password}" />
   <c:out value="${user.email}" />
</c:forEach>

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