基于请求参数填充 Javabeans 的简单方法 [英] Easy way of populating Javabeans based on request parameters
本文介绍了基于请求参数填充 Javabeans 的简单方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个简单的person类:
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;
}
}
和一个简单的 html 页面:
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>
和一个简单的 servlet:
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");
}
}
有没有办法自动设置参数?
Is there a way to automate the parameter setting?
像魔法一样的东西
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");
}
推荐答案
为此 Apache Commons BeanUtils经常使用.
BeanUtils.populate(bean, request.getParameterMap());
就是这样.
为了更进一步，您可以采用使用 Javabeans 作为模型的 MVC 框架，这样您就完全不需要担心它们，例如 JSF 或 Spring MVC.
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.
与具体问题无关，在这个特定示例中使用 getParameterValues() 是笨拙的.只需使用 getParameter().
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"));
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