Customizable export data queries

List of the contents of this article:

• 1,Customizable export data queries How to get the current time of the system in jsp with el expression
• 2,jsp how to get the current time and add one month later
• 3, How to display system time in JSP Dynamically display the system time

Use eL How to get the current time of the system in jsp for expressions

1. If there is: ${ age} to get this age value in action, it can be written as, provided that struts2 is used. The name value must be the same as the attribute name in the action, and the set and get methods must be provided for this attribute.

2. You add an extra pair of quotation marks, which should be changed to var jsonData = ${ dataJson}; generally json will have double quotation marks, such as { a:abc, b:1122}, and the double quotation marks here will conflict with the double quotation marks you wrote.

3. Ordinary display embedding java code in the jsp page, but this method is generally not recommended.

4. The import of EL expressions. Strictly speaking, it is unscientific to write JAVA code directly in the SJP page. At least I haven't encountered any formal projects in the past few years. Generally, when we use JSP, we will use a tag library called EL expression. To use the tag library, you first need to download jstl.jar and import it into the project environment.

5. Just use the Javascipt statement to compare, and then prompt the user information error.

6. Personal study notes. The use of non-copying El expressions: What is EL expressions: It is a set of simple calculation rules used to assign values to the attributes of jsp tags.

jsp how to get the current time and get the time after one month

1. Introduce the Calendar and Date classes, get the day before and the day after, use the add method of Calendar, the positive number is after A few days, the negative number is a few days ago. If you deposit it in the database, just write it directly to the library. It's very simple, and you can refer to jdbc.

2. In JavIn aScript, you can use the Date object and the getTime() method to obtain the time after a certain point in time. The specific implementation steps are as follows: First, get the timestamp of the current time point, and use the `Date.now()` method or the `new Date().getTime()` method.

3,-, /); var t = dategetTime () + 30 * 24 * 3600 * 1000; var date2 = new Date (t); document.body.i nnerText = date2; the browser runs the index.html page, and the result of the date of 2012-12-11 plus 30 days is printed at this time.

4. Date is the time you get. The display format can be adjusted at will according to the format of (yyyy-MM-dd HH: mm: ss). If you want to get some more specific date line data, you can check the Calendar class of API.

5. You can specify the system time in the database field, and automatically fill in the current system time when inserting data.

How to dynamically display the system time in JSP

1. There are many methods. First, you can specify the system time in the database field and automatically fill in the current system time when inserting data.

2. To display the reality in the JSP web pageThere are no more than two ways: the first is to do it through the JAVA script in jsp, but the time generated by the JAVA script is fixed after compilation and html is generated. Only the next time the page is refreshed will it be recompiled to generate a new time (it is estimated that this method is not what you want .

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