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Details that need to be paid attention to when java receives form submitted parameters through beans

Y2J
Release: 2017-05-12 09:42:21
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This article mainly introduces the points to note when using beans in SpringMVC to receive parameters submitted by form forms, and has a good reference value. Let's take a look at it with the editor

This is the summary experience of the predecessors in recording form data received by SpringMVC:

SpringMVC receives page form parameters

springmvcRequest parametersSeveral methods of obtaining

The following are the details and points of attention that I discovered when using it. The predecessors did not record the details and points of attention:

Use When the bean receives the parameters submitted by the form form, the pojo must contain a default (i.e. empty) constructor . At the same time, the variable that needs to be set in the bean must have a setter method.

Note: The following codes are all sample codes. They are not actual codes run by me. Please add them by yourself.

For example: I have a bean class called User with variables username and password. At the same time, the content submitted by the form is:

<form action="save-user-info" method="post">
 <span>帐号:</span><input type="text" name="username"><br>
 <span>密码:</span><input type="text" name="password"><br>
 <input type="submit" value="保存">
</form>
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Then, the User.java file must have

public User() {}

public void setUsername(String username) {
  this.username = username;
}

public void setPassword(String password) {
  this.password = password;
}
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At this time, I can successfully receive the parameters in the Controller and generate the corresponding beanObject

@RequestMapping(value="/save-user-info")
public String saveUser(SsbiUser user) {
  System.out.println(user.toString());
  return "user-info";
}
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Through some tests, I understand this process as, After the front desk submits a form containing User data, after the background receives the parameters, it will first Generate a User object that does not contain any parameters, and then set the corresponding value to this empty object through the setter method, and finally get the User object we need .

Instead of what I thought at first, the background receives the parameters and directly calls the corresponding User(username, password)Construction methodGenerate required object.

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