Shulou(Shulou.com)06/02 Report--

This article shows you how to analyze the integration of Ant and Eclipse. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Introduction to Eclipse

As a Java developer, you may sometimes feel the strictness of the Java format. Missing import declarations, forgetting to declare variables, no semicolons, syntax confusion, and text editor typesetting can all cause the Java command line compiler javac to react, resulting in several pages of error messages.

The error message tells you that javac knows about the error, but why not fix the problem so that you can continue to work? Javac doesn't solve this problem; to do this, you can use an IDE to catch errors before compiling and give advice. Java is in urgent need of good IDE. At present, the best IDE of Java is Eclipse. Figure 11-1.

Like many other Java IDEs, Eclipse is free to download, but there are many advantages behind Eclipse, which is the power of IBM and is said to cost 40 million dollars to develop. Now, it is an open source project, mainly in IBM software development, but partly by a software organization called Eclipse.org.

Tip: if you want to read more about Eclipse. Check out Eclipse's help (OReilly).

Get Eclipse

Eclipse is free to download; all you have to do is browse http://www.eclipse.org/downloads. Select a downloadable image on the web page. When you do something, you will come up with a series of downloadable types: when you open the web page, you will see a list of different versions of downloadable addresses.

Release builds (release version)

This is a version for general use.

Stable builds (stable version)

Similar to the trial version.

Integration builds (integrated version)

This version is made up of tested components, but there may be some problems with the integration operation.

Nightly builds

This version is the most experimental of all Eclipse releases and is released daily by the Eclipse team, but there is no guarantee that it will work.

Tip: like other software, you generally use the latest Eclipse release; in this section I use the latest release, Eclipse3.0.

Choose the right version of your operating system, click the appropriate link, and download it. Eclipse is easy to install; all you have to do is unzip (Windows OS) or untar (linuxUnix OS) it, depending on your operating system. Because the version you downloaded is for your operating system, when you unzip Eclipse, you will find executable files in the folder. Start running Eclipse. Exe by running the Eclipse executable. When you run Eclipse for the first time, you should see the welcome page. To view an overview or tutorial of Eclipse, just use the appropriate link. To close the welcome page, just click the X number in the title bar of the page.

Set up an Eclipse project

If you have Eclipse installed and running, you enter the Ant/Eclipse interface without any extra work to do. Eclipse development is project-based, and I will create a new project that demonstrates how to use Ant in Eclipse. To create a new project, select File → New → Project and open the New Project dialog box. Select the Java project and click Next.

On the next page, name the project AntExample. Other options default, then press finish.

This creates a new project in Eclipse. You can see the AntExample project in Package Explorer on the left side of Eclipse.

This project is empty so far; to add Java code, select the AntExample project in Package Explorer, then select File → New → Class to open the New Java Class dialog. Fill in org.antbook in package name, the name of the new class is AntClass, select the check box marked public static void main (String [] args), and have Eclipse create a main method. Click the Finish button.

This completes the creation of an Antclass.java code with the main () method, which you can see in the middle Eclipse editor.

Add the following code to complete some functions of this class.

Public static void main (String args [])

{

System.out.println ("No worries.")

}

Click the Save icon in the toolbar to save the changes to AntClass.java, and then select Run → Run As → Java Application. You can see the output of this code in the console tab at the bottom of Eclipse, No worries.

Write an Ant compilation file in Eclipse

Create an Ant compilation file in Eclipse, right-click the AntExample project in Package Explorer, and select New → File. Fill in build.xml in the File Name box, click finish, and add a new file to the AntExample project. Package the project and fill the XML into the build file.

Building the .jar file.

Fill in the XML code into the build file and save it. Eclipse obviously supports that Ant; build.xml has an Ant icon on the left in Package Explorer, and the syntax coloring of the build file has also changed. XML declares to use one color, attribute values to use one color, and Ant keywords to use another color, as shown in figure 11-3 (with bright black and white). The target (targets) of the Build file appears in the Outline view on the right

Tip: if you close build.xml you can reopen it in the Eclipse Ant editor; double-click it in Package Explorer. Unlike previous versions of Eclipse, there is no default ant editor. You have to take extra steps to open the Ant compiled file for editing.

Obviously, Eclipse's code helper (also known as content helper) supports Ant, while Eclipse3.0 adds code assistant support for Ant build files. When you enter the area describing Ant elements or attributes, you can press Ctrl-Space to open the code assistant, which will list what you may want to type, as shown in figure 11-4.

Tip: if you type $and use the code assistant, Eclipse's Ant editor will list all Ant property names.

Eclipse3.0 can catch syntax errors in Ant build files. For example, terminating a target instead of a tag immediately caught the attention of the Eclipse Ant editor, as shown in figure 11-5. If you hover your cursor over the icon to the left of the problem line, you can see Eclipse's explanation of the problem: "Expected `to terminate element starting on line 3." (missing the element that terminates the beginning of the third line.) this syntax checking and syntax correction alone is valuable.

Tip: for finer typesetting, you can reformat an Ant build file, use the format command (Ctrl-Shift-F) in the Ant editor environment menu or select Edit → Format.

To see the property value, hover over it and the property value will appear in the prompt tool.

Tip: in some cases, Eclipse will generate Ant scripts for you. For example, if you create an Eclipse plug-in and use your own view and editor to extend Eclipse, you will use a plug-in description file Plugin.xml. If you right-click the description file and select the "Create Ant Build File" (create Ant compilation file) item, Eclipse will create a build file for you. If you choose the Project → Generate Javadoc,Javadoc wizard, you will use the javadoc tool to generate the Ant compilation file, which can be edited as needed.

Run the Ant Build file

To run the build file in Eclipse, you have two options. You can right-click build.xml in Package Explorer and select Run → Ant Build. Run Ant in this way and give the results in the console of Eclipse.

Tip: Eclipse3.0 runs Ant in an isolated JVM, which solves many of the problems that plagued previous versions.

The console gives the same result as if you run the build file from the command line:

Buildfile: D:eclipse3eclipseworkspaceAntExampleuild.xml

Compile:

[javac] Compiling 1 source file

Compress:

[jar] Building jar: D:eclipse3eclipseworkspaceAntExampleProject.jar

Main:

[echo] Building the .jar file.

BUILD SUCCESSFUL

Total time: 2 seconds

If there is a problem, you can look at the output of Ant in the console. Eclipse will give you a summary of the questions in the question bar, which you can view by clicking the question bar at the bottom of Eclipse.

Another way to run the build file is to right-click build.xml in Package Explorer and select Run → Ant Build..., with an ellipsis (3 dots). The Ant running configuration dialog box opens, and the Ant running configuration is for the current project.

By default, the dialog box selects the target bar, which displays a list of targets in the build.xml file. The default target has been selected; you can click the Run button to run the target, or you can select another target. If you only select the default target, you can see the same result on the console.

You can set the execution order of the goals, which is displayed in the bottom Target execution order text box of the dialog box (the order in which you select projects will be the order in which they are run). Ant will still run the prerequisites for each target, but you have to be careful not to mess up the entire compilation order.

Select the build file and pass parameters for Ant

In Eclipse you can get and run all the functions of Ant from the command line. For example, for Ant pass parameters, right-click build.xml and select Run → Ant Build... Open the Ant running configuration. On this page, you can make the compiled files and directories you want to use, and pass parameters to Ant.

Tip: the Capture output check box at the bottom of the dialog box indicates whether you want to display Ant output in the Eclipse console, which is selected by default.

The above is how to analyze the integration of Ant and Eclipse. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.