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Learn how to build your AP program and expand your course offerings. Get help organizing your AP program and administering the AP Exams. If you are building a software for HR or finance domain, there is usually requirement for generating excel reports which are usually across management levels. Apart from reports, you can expect input data for application coming in form of excel sheets and application is expected to support it. These are many open source APIs to handle such scenarios. In short, you can read and write MS Excel files using Java.

In this post, I am discussing some common activities required to do in real life application. If you are working on a maven project, you can include the POI dependency in pom. API-compatible streaming extension of XSSF to be used when very large spreadsheets have to be produced, and heap space is limited. XSSF gives access to all rows in the document.

We will see the usage of above classes in coming examples. I am taking this example first so that we can reuse the excel sheet created by this code to read back in next example. It seems very simple, right? Reading an excel file is also very simple if we divide this in steps. Lets see all above steps in code. I am writing the code to read the excel file created in above example. Create Workbook instance holding reference to .

When working on complex excel sheets, we encounter many cells which have formula to calculate their values. Apache POI has excellent support for adding formula cells and evaluating already present formula cells also. Les see one example of how to set formula cells in excel? In this code, there are four cells in a row and fourth one in multiplication of all previous 3 rows.

Similarly, I you want to read a file which have formula cells in it, use following logic to evaluate the formula cells. But, when we are creating a report in excel file and it becomes utmost important to add formatting on cells which fit into any per-determined criteria. This formatting can be a different coloring based on certain value range, based on expiry date limit etc. In below examples, I am taking couple of such formatting examples for various purposes. This piece of code will color any cell in range whose value is between a configured range. Duplicates numbers in the column are highlighted. A very useful code for financial projects which keep track of dead lines.

I am ending this post here for keeping the post in limit. I will post some useful code samples in coming posts. Click on below given link to download the source code of above examples. I love computers, programming and solving problems everyday. A family guy with fun loving nature.

Some of the istorm reports are not working correctly in Excel 365. Hi Lokesh, it was very helpful. 1 and I need those cell values i. Please throw some light on this.