我有一个在GUI设计师的帮助下创建的项目。 这是主要形式的代码。
public class MainForm {
MainForm() {
directLineOkButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
}
}
});
crossLineOkButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
clearButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
saveButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
});
}
public JPanel getMainPanel() {
return mainPanel;
}
private void createUIComponents() {
drawingPanel = new DrawingPanel();
}
private JPanel mainPanel;
private JComboBox directDirectionCombobox;
private JButton directLineOkButton;
private JButton crossLineOkButton;
private JComboBox crossLineComboBox;
private JTextField crossLineSizeValue;
private JButton clearButton;
private JLabel directLineLabel;
private JPanel directLinePanel;
private JLabel crossLineLabel;
private JPanel crossLinePanel;
private JPanel okClearButtonPanel;
private JTextField directLineSizeValue;
private JButton saveButton;
private JPanel drawingPanel;
private JButton cancelButton;
}
工作正常。 Jar文件生成好，这里是pom.xml的代码
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>DOC</groupId>
<artifactId>DOC</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>
</project>
但是当我尝试运行jar文件时出现了错误。
Exception in thread "main" java.lang.NullPointerException
at MainForm.<init>(MainForm.java:14)
at Main.main(Main.java:13)
它显示错误位于创建directLineOkButton侦听器的行。我像这里所说的创建听众： http://www.jetbrains.com/idea/training/demos/GUI_Designer/GUI_Designer.html 在构造函数中使用cmd + o。 这是xml表单的代码：
<?xml version="1.0" encoding="UTF-8"?>
<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="MainForm">
<grid id="27dc6" binding="mainPanel" layout-manager="FormLayout">
<rowspec value="center:23px:noGrow"/>
<rowspec value="top:3dlu:noGrow"/>
<rowspec value="center:47px:noGrow"/>
<rowspec value="top:3dlu:noGrow"/>
<rowspec value="center:max(d;4px):noGrow"/>
<rowspec value="top:3dlu:noGrow"/>
<rowspec value="center:max(d;4px):noGrow"/>
<rowspec value="top:7dlu:noGrow"/>
<rowspec value="center:25px:noGrow"/>
<rowspec value="top:174dlu:noGrow"/>
<rowspec value="center:max(d;4px):noGrow"/>
<colspec value="fill:d:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:452px:noGrow"/>
<constraints>
<xy x="20" y="20" width="797" height="453"/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="3b663" class="javax.swing.JLabel" binding="directLineLabel">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Direct Line"/>
</properties>
</component>
<grid id="499e0" binding="directLinePanel" layout-manager="FormLayout">
<rowspec value="center:d:grow"/>
<colspec value="fill:98px:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:80px:grow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<constraints>
<grid row="1" column="0" row-span="2" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="c383d" class="javax.swing.JComboBox" binding="directDirectionCombobox">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<enabled value="true"/>
<model>
<item value="Вверх"/>
<item value="Вниз"/>
<item value="Вправо"/>
<item value="Влево"/>
</model>
</properties>
</component>
<component id="17aa1" class="javax.swing.JTextField" binding="directLineSizeValue">
<constraints>
<grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="6" anchor="8" fill="1" indent="0" use-parent-layout="false">
<preferred-size width="150" height="-1"/>
</grid>
<forms defaultalign-horz="false"/>
</constraints>
<properties/>
</component>
<component id="44fc7" class="javax.swing.JButton" binding="directLineOkButton">
<constraints>
<grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="OK"/>
</properties>
</component>
</children>
</grid>
<component id="5a571" class="javax.swing.JLabel" binding="crossLineLabel">
<constraints>
<grid row="4" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Cross Line"/>
</properties>
</component>
<grid id="77f1a" binding="crossLinePanel" layout-manager="FormLayout">
<rowspec value="center:d:grow"/>
<colspec value="fill:98px:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:80px:grow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<constraints>
<grid row="6" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties/>
<border type="none"/>
<children>
<component id="32368" class="javax.swing.JComboBox" binding="crossLineComboBox">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="8" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<model>
<item value="Вверх-вправо"/>
<item value="Вверх-влево"/>
<item value="Вниз-вправо"/>
<item value="Вниз-влево"/>
</model>
</properties>
</component>
<component id="dbf23" class="javax.swing.JTextField" binding="crossLineSizeValue">
<constraints>
<grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="6" anchor="8" fill="1" indent="0" use-parent-layout="false">
<preferred-size width="150" height="-1"/>
</grid>
<forms defaultalign-horz="false"/>
</constraints>
<properties/>
</component>
<component id="c5c8a" class="javax.swing.JButton" binding="crossLineOkButton">
<constraints>
<grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="OK"/>
</properties>
</component>
</children>
</grid>
<grid id="53bbc" binding="okClearButtonPanel" layout-manager="FormLayout">
<rowspec value="center:d:noGrow"/>
<colspec value="fill:d:noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<colspec value="left:4dlu:noGrow"/>
<colspec value="fill:max(d;4px):noGrow"/>
<constraints>
<grid row="8" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<enabled value="false"/>
</properties>
<border type="none"/>
<children>
<component id="41ba7" class="javax.swing.JButton" binding="saveButton">
<constraints>
<grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Сохранить"/>
</properties>
</component>
<component id="a6bf6" class="javax.swing.JButton" binding="clearButton">
<constraints>
<grid row="0" column="2" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Очистить"/>
</properties>
</component>
<component id="40f1c" class="javax.swing.JButton" binding="cancelButton">
<constraints>
<grid row="0" column="4" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<text value="Отменить"/>
</properties>
</component>
</children>
</grid>
<grid id="2e94e" binding="drawingPanel" custom-create="true" layout-manager="FormLayout">
<rowspec value="center:d:grow"/>
<colspec value="fill:d:grow"/>
<constraints>
<grid row="0" column="2" row-span="11" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
<forms/>
</constraints>
<properties>
<background color="-1"/>
</properties>
<border type="none"/>
<children/>
</grid>
</children>
</grid>
</form>
答案 0 :(得分：19)
您必须包含ideauidesigner-maven-plugin：
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>ideauidesigner-maven-plugin</artifactId>
<version>1.0-beta-1</version>
<executions>
<execution>
<goals>
<goal>javac2</goal>
</goals>
</execution>
</executions>
<configuration>
<fork>true</fork>
<debug>true</debug>
<failOnError>true</failOnError>
</configuration>
</plugin>
</plugins>
</build>
并且可选 - 如果您使用GridLayoutManager或JGoodies - 还包括forms_rt作为依赖项：
<dependency>
<groupId>com.intellij</groupId>
<artifactId>forms_rt</artifactId>
<version>7.0.3</version>
</dependency>
答案 1 :(得分：4)
使用maven构建项目时遇到了同样的问题。解决了我的问题的方法是将＆＃34;生成GUI的值更改为：＆＃34;来自＆＃34;二进制类文件＆＃34; - ＆GT; ＆＃34; Java源代码＆＃34;在设置中（可在项目|设置|编辑器| GUI设计器中找到）。
答案 2 :(得分：3)
我自己找到了决定。 http://glxn.net/2010/08/17/making-a-swing-project-using-intellij-idea-and-gui-builder-with-maven-including-executable-jar/ 你需要特殊的插件来制作与intelliji idea gui designer的maven项目。
答案 3 :(得分：1)
GUI 设计器的问题在于它没有可以使用的 Maven 直接插件，因为 Intellij 使用 ant 对目标 .class 文件进行后处理。如果你和我一样，不喜欢用 intellij 代码轰炸你的 .java，你可以使用 maven ant 插件：
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.7</version>
<dependencies>
<dependency>
<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<version>1.7.0</version>
<scope>system</scope>
<systemPath>${java.home}/../lib/tools.jar</systemPath>
</dependency>
</dependencies>
<executions>
<execution>
<phase>compile</phase>
<configuration>
<tasks>
<path id="j2cp">
<fileset dir="${project.basedir}/src/main/resources/antlibs" includes="*.jar"/>
</path>
<path id="j2sp">
<pathelement location="${project.basedir}/src/main/java"/>
</path>
<taskdef name="javac2" classpathref="j2cp" classname="com.intellij.ant.Javac2"/>
<javac2 destdir="${project.basedir}/target/classes">
<src refid="j2sp"/>
</javac2>
</tasks>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
但是您需要将 javac2 jar 放入资源/antlibs 中，在我的项目中我使用这些：
您可以在 ${Intellij.home}/libs 中找到这些库
如果你使用特定的 IDE 布局，也许你需要其他特定的 jars，如果你错过了什么，ant 插件将是特定的
答案 4 :(得分：0)
在动态初始值设定项（包含{{}}的部分）中，您正在访问directLineOkButton：
directLineOkButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
//some action
}
}
});
但是，该字段尚未分配，因此您将获得NullPointerException。