Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
466 views
in Technique[技术] by (71.8m points)

java - Easy way of populating Javabeans based on request parameters

I have a simple person class:

package simpleApp.entities;

public class Person {
    private String name;
    private String secondname;

    public void setSecondname(String cognome) {
        this.secondname = cognome;
    }
    public String getSecondname() {
        return secondname;
    }
    public void setName(String nome) {
        this.name = nome;
    }
    public String getName() {
        return name;
    }

}

and a simple html page:

<html>
<body>

    <form action="/simpleApp/person/" method="POST">
        name: <input type="text" name="name"><br>
        second name: <input type="text" name="secondname"><br>
        <input type="submit">
    </form>

</body>
</html>

and a simple servlet:

public class Person extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public Person() {
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //LOOK HERE:
        simpleApp.entities.Person p = new simpleApp.entities.Person();

        p.setName(request.getParameterValues("name")[0]);
        p.setSecondname(request.getParameterValues("secondname")[0]);

        response.sendRedirect("/simpleApp/index.html");
    }

}

Is there a way to automate the parameter setting?

Something magic like

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        simpleApp.entities.Person p = new simpleApp.entities.Person();

        Magic.justSetEverything(p, request);

//      NOT NEEDED ANYMORE!!! MUAHAHAHA more time for coffee
//      p.setName(request.getParameterValues("name")[0]);
//      p.setSecondname(request.getParameterValues("secondname")[0]);

        response.sendRedirect("/simpleApp/index.html");
    }
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

For that Apache Commons BeanUtils is often used.

BeanUtils.populate(bean, request.getParameterMap());

That's it.

To get a step further, you can adopt a MVC framework which uses Javabeans as models so that you don't need to worry about them at all, such as JSF or Spring MVC.


Unrelated to the concrete question, using getParameterValues() is clumsy in this specific example. Just use getParameter().

p.setName(request.getParameter("name"));
p.setSecondname(request.getParameter("secondname"));

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...