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>
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; }
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"; }
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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