ObyTYTpFuOM/TcjOOfeZ-jI/AAAAAAAAAFo/jdaStHbpPUo/s1600/output.jpg' alt='Writing Html Files In Java' title='Writing Html Files In Java' />What you are looking for is a java decompiler. I recommend JAD http Its free for non commercial use and gets the job done. Readingwriting Excel Files in Java POI tutorial. 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. Apache POI is one of them and is well trusted over time. In short, you can read and write MS Excel files using Java. OnlineTutorials/static/article_media/jsp%20-%20servlets/servletexample%20[1].jpg' alt='Writing Html Files In Java' title='Writing Html Files In Java' />In addition, you can read and write MS Word and MS Power. Point files using Java. Writing Html Files In Java' title='Writing Html Files In Java' />In this post, I am discussing some common activities required to do in real life application. Sections in this post Apache POI runtime dependencies. Some useful common classes. Writing an excel file. Reading an excel file. Using formulas in excel sheet. Formatting the cells. Sourcecode download. Apache POI runtime dependencies. If you are working on a maven project, you can include the POI dependency in pom. Id org. apache. Id. Id poilt artifact. Id. lt version 3. If you are not using maven, then you can download maven jar files from POI download page. Include following jar files minimum to run the sample code dom. Some useful POI classes. Apache POI main classes usually start with either HSSF, XSSF or SXSSF. HSSF is the POI Projects pure Java implementation of the Excel 9. HSSFWorkbook, HSSFSheet. XSSF is the POI Projects pure Java implementation of the Excel 2. OOXML. xlsx file format. XSSFWorkbook, XSSFSheet. SXSSF since 3. 8 beta. API compatible streaming extension of XSSF to be used when very large spreadsheets have to be produced, and heap space is limited. SXSSFWorkbook, SXSSFSheet. SXSSF achieves its low memory footprint by limiting access to the rows that are within a sliding window, while XSSF gives access to all rows in the document. Apart from above classes, Row and Cell are used to interact with a particular row and a particular cell in excel sheet. Another useful class Formula. Open source Java projects Spring Batch Reading and writing CSV files with Spring Batch and MySQL. WELCOME TO the Seventh Edition of Introduction to Programming Using Java, a free, online textbook on introductory programming, which uses Java. An HTML Application HTA is a Microsoft Windows program whose source code consists of HTML, Dynamic HTML, and one or more scripting languages supported by Internet. A Word About the Java Platform. The Java platform consists of the Java application programming interfaces APIs and the Java 1 virtual machine JVM. Writing Html Files In Java' title='Writing Html Files In Java' />Evaluator is used to evaluate the formula cells in excel sheet. A wide range of classes like Cell. Style, Builtin. Formats, Comparison. Operator, Conditional. Formatting. Rule, Font. Formatting, Indexed. Colors, Pattern. Formatting, Sheet. Conditional. Formatting etc. We will see the usage of above classes in coming examples. Writing an excel file. I am taking this example first so that we can reuse the excel sheet created by this code to read back in next example. Writing a file using POI is very simple and involve following steps Create a workbook. Create a sheet in workbook. Create a row in sheet. Java Input Output. This tutorial explains how to read and write files via Java. In modern Java applications you typically use the java. API to read and write. 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. Add cells in sheet. Repeat step 3 and 4 to write more data. It seems very simple, right Lets have a look at the code doing these steps. Write. Excel. Demo. String args. Blank workbook. XSSFWorkbook workbook new XSSFWorkbook. Create a blank sheet. XSSFSheet sheet workbook. SheetEmployee Data. This data needs to be written Object. Maplt String, Object data new Tree. Maplt String, Object. Object ID, NAME, LASTNAME. Object 1, Amit, Shukla. Object 2, Lokesh, Gupta. Object 3, John, Adwards. Object 4, Brian, Schultz. Iterate over data and write to sheet. Tutorial Para Dibujar A Lapiz Pdf here. Setlt String keyset data. Set. int rownum 0. String key keyset. Row row sheet. create. Rowrownum. Object obj. Arr data. getkey. Object obj obj. Arr. Cell cell row. Cellcellnum. String. Cell. ValueStringobj. Integer. cell. set. Cell. ValueIntegerobj. Write the workbook in file system. File. Output. Stream out new File. Output. Streamnew Filehowtodoinjavademo. System. out. printlnhowtodoinjavademo. Exception e. e. print. Stack. Trace. Reading an excel file. Reading an excel file is also very simple if we divide this in steps. Create workbook instance from excel sheet. Get to the desired sheet. Increment row numberiterate over all cells in a rowrepeat step 3 and 4 until all data is read. Lets see all above steps in code. I am writing the code to read the excel file created in above example. Read. Excel. Demo. String args. File. Input. Stream file new File. Input. Streamnew Filehowtodoinjavademo. Create Workbook instance holding reference to. XSSFWorkbook workbook new XSSFWorkbookfile. Get firstdesired sheet from the workbook. XSSFSheet sheet workbook. Sheet. At0. Iterate through each rows one by one. Iteratorlt Row row. Iterator sheet. Iterator. Next. Row row row. Iterator. For each row, iterate through all the columns. Iteratorlt Cell cell. Iterator row. cell. Iterator. while cell. Iterator. has. Next. Cell cell cell. Iterator. Check the cell type and format accordingly. Cell. Type. case Cell. CELLTYPENUMERIC. System. Numeric. Cell. Value t. Cell. CELLTYPESTRING. System. out. printcell. String. Cell. Value t. System. out. println. Exception e. e. print. Stack. Trace. IDNAMELASTNAME. AmitShukla. 2. 0LokeshGupta. JohnAdwards. 4. BrianSchultz. Using formulas in excel sheet. When working on complex excel sheets, we encounter many cells which have formula to calculate their values. These are formula cells. 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 excelIn this code, there are four cells in a row and fourth one in multiplication of all previous 3 rows. So the formula will be A2B22 in second row. String args. XSSFWorkbook workbook new XSSFWorkbook. XSSFSheet sheet workbook. SheetCalculate Simple Interest. Row header sheet. Row0. header. create. Cell0. set. Cell. ValuePricipal. Cell1. Cell. ValueRo. I. Cell2. set. Cell. ValueT. header. Cell3. Cell. ValueInterest P r t. Row data. Row sheet. Row1. data. Row. Cell0. Cell. Value1. 45. Row. create. Cell1. Cell. Value9. 2. Row. Cell2. Cell. Value3d. Row. create. Cell3. Cell. FormulaA222. File. Output. Stream out new File. Output. Streamnew Fileformula. Demo. xlsx. workbook. System. out. printlnExcel with foumula cells written successfully. File. Not. Found. Exception e. e. Stack. Trace. catch IOException e. Stack. Trace. Similarly, I you want to read a file which have formula cells in it, use following logic to evaluate the formula cells. Sheet. With. Formula. File. Input. Stream file new File. Input. Streamnew Fileformula. Demo. xlsx. Create Workbook instance holding reference to. XSSFWorkbook workbook new XSSFWorkbookfile. Formula. Evaluator evaluator workbook. Garmin Windows Ce 6.0 Download. Creation. Helper. Formula. Evaluator. Get firstdesired sheet from the workbook. XSSFSheet sheet workbook. Sheet. At0. Iterate through each rows one by one. Iteratorlt Row row. Iterator sheet. Iterator. Next. Row row row. Iterator. For each row, iterate through all the columns. Iteratorlt Cell cell. Iterator row. cell. Iterator. while cell. Iterator. has. Next. Cell cell cell. Iterator. Check the cell type after eveluating formulae. If it is formula cell, it will be evaluated otherwise no change will happen. In. Cellcell. get. Cell. Type. case Cell. CELLTYPENUMERIC. System. Numeric. Cell. Value tt. Cell. CELLTYPESTRING. System. out. printcell. String. Cell. Value tt. Cell. CELLTYPEFORMULA. Not again. System. Exception e. e. print. Writing JDBC Applications with My. SQLPaul Du. Boispaulkitebird. Document revision 1. Last update 2. 00. You can write My. SQL applications in a variety of languages. The. languages that most people use with My. SQL are PHP and Perl, but. My. SQL ConnectorJ driver. Java applications that interact with. My. SQL server. My. SQL ConnectorJ works within the framework of the Java JDBC. API that allows Java programs to use database servers. JDBC is based on an approach similar to that. Perl and Ruby DBI modules, Pythons DB API. PHPs PEAR DB class. This approach uses a two tier. The top level is visible to application programs and presents. The application interface does not depend on details specific. The lower level consists of drivers for individual database engines. Each driver handles the details necessary to map the abstract. The JDBC interface allows developers to write applications that. Once a driver for a given server engine is installed. JDBC applications can communicate with any server of that type. By using My. SQL ConnectorJ, your Java programs can access My. SQL. databases. Note My. SQL ConnectorJ is the successor to the MM. My. SQL. driver. If you have JDBC programs written for MM. My. SQL, they should. My. SQL ConnectorJ as well, although you may want to. Just replace. instances of org. Java source files. To use Java applications with My. SQL, you may need to install some. If you want to compile and run Java programs, youll need a Java. If these are not already installed on your system. Java Software Development Kit. SDK from java. sun. If you want only to run precompiled applications, no compiler. Java Runtime Environment. JRE. This too may be obtained from java. This article assumes that youll write and compile your own programs. Java SDK installed. Once you compile. Java program, however, you can deploy it to other machines. This works even. in heterogenous installations, because Java is platform independent. Applications compiled on one platform can be expected to work. For example, you can develop on a Linux box. Windows. To connect to the My. SQL server, register the JDBC driver you plan. Connection method. The following. short program, Connect. It accesses. a database named test, using a My. SQL account with a user. Connect. public static void main String args. Connection conn null. String user. Name testuser. String password testpass. String url jdbc mysql localhosttest. Class. for. Name com. Driver. new. Instance. Driver. Manager. get. Connection url, user. Name, password. System. Database connection established. Exception e. System. Cannot connect to database server. System. out. println Database connection terminated. Exception e ignore close errors. Compile Connect. java to produce a class file Connect. Java code. javac Connect. Then invoke the class file as follows and it should connect to. My. SQL server. java Connect. Database connection established. Database connection terminated. If you have trouble compiling Connect. Java Software Development Kit installed and make. My. SQL ConnectorJ driver is listed in your CLASSPATH. The arguments to get. Connection are the connection URL. My. SQL account. As illustrated. Connect. java, JDBC URLs for My. SQL consist of jdbc mysql. My. SQL server host and the database. An alternate syntax for specifying the user and password. URL. jdbc mysql localhosttest When you specify a URL using this second format, get. Connection. requires only one argument. For example, the code for connecting. My. SQL server in Connect. String user. Name testuser. String password testpass. String url jdbc mysql localhosttestName. Class. for. Name com. Driver. new. Instance. Driver. Manager. get. Connection url. Connect returns a Connection object that. My. SQL by issuing queries and retrieving. The next section describes how to do this. When. My. SQL server. To increase the portability of your applications, you can store. Java properties file and read the properties at runtime. Then they need not be listed in the program itself. This allows. you to change the server to which the program connects by editing. To process SQL statements in a JDBC based application, create. Statement object from your Connection object. Statement objects support an execute. Update. method for issuing queries that modify the database and return. Query method for queries. The query processing examples in. CREATE TABLE animal. INT UNSIGNED NOT NULL AUTOINCREMENT. PRIMARY KEY id. CHAR4. CHAR4. AUTOINCREMENT column, so My. SQL automatically. The following example obtains a Statement object from. Connection object, then uses it to create and populate. DROPTABLE, CREATETABLE, and INSERT all are statements that modify. Update is the appropriate method. Statement s conn. Statement. s. execute. Update DROP TABLE IF EXISTS animal. Update. CREATE TABLE animal. INT UNSIGNED NOT NULL AUTOINCREMENT,. PRIMARY KEY id,. CHAR4. CHAR4. Update. INSERT INTO animal name, category. VALUES. snake, reptile,. System. out. println count rows were inserted. The execute. Update method returns the number of rows. As shown above, the count is used to report. INSERT statement added to the animal. A Statement object may be used to issue several queries. When youre done with it, invoke its close method to. For statements such as SELECT queries that retrieve information. Query. After calling. Result. Set object and use it to. The following. example shows one way to retrieve the contents of the animal. Statement s conn. Statement. s. execute. Query SELECT id, name, category FROM animal. Result. Set rs s. Result. Set. int count 0. Val rs. get. Int id. String name. Val rs. String name. String cat. Val rs. get. String category. System. out. println. Val., name name. Val., category cat. Val. count. rs. System. Query does not return a row count, so if you. To obtain the column values from each row, invoke get. XXX. methods that match the column data types. The get. Int. and get. String methods used in the preceding example. As the example shows, these. You. can also fetch values by position. For the result set retrieved. SELECT query in the example, id, name. Val rs. get. Int 1. String name. Val rs. String 2. String cat. Val rs. get. String 3. Result. Set objects, like Statement objects, should. To check whether or not a column value is NULL, invoke. Null method after fetching. For example, you could check for a NULL value. String name. Val rs. String name. if rs. Null. name. Val no name available. Sometimes its necessary to construct queries from values containing. For example, in queries. SQL. In this case, its. JDBC handle the escaping for you, rather than. To use this approach. Prepared. Statement. Then tell JDBC to bind the data values to the placeholders. Suppose you have two variables name. Val and cat. Val. To do so without regard to whether or not the values contain. Prepared. Statement s. Statement. INSERT INTO animal name, category VALUES,. String 1, name. Val. String 2, cat. Val. Update. System. The characters in the query string act as placeholders special. The set. String. The method you use to bind a value. For example, set. String binds. string values and set. Int binds integer values. If you want to trap errors, execute your JDBC operations within.