blocks|key|3155402|text|如果你真的需要源代码，我不知道任何可以生成源代码的东西。但是，您可以使用ASM或CGLIB直接创建.class文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3155403|您也许能够从这些代码中生成源代码，但我只使用它们来生成字节码。|3155404|entityMap|0|LINK|mutability|MUTABLE|url|http://asm.objectweb.org/|1|http://cglib.sourceforge.net/^0|10|3|0|14|5|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

If you REALLY need the source, I don't know of anything that generates source. You can however use <a href="http://asm.objectweb.org/" rel="nofollow noreferrer">ASM</a> or <a href="http://cglib.sourceforge.net/" rel="nofollow noreferrer">CGLIB</a> to directly create the .class files. 

You might be able to generate source from these, but I've only used them to generate bytecode.

blocks|key|3155442|text|Eclipse+JET项目可以用来生成源代码。我不认为它的API与您描述的API完全相同，但每次我听说一个项目进行Java源代码生成时，他们都会使用JET或自行开发的工具。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3155443|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eclipse.org/modeling/m2t/?project=jet^0|0|B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The <a href="http://www.eclipse.org/modeling/m2t/?project=jet" rel="nofollow noreferrer">Eclipse JET</a> project can be used to do source generation. I don't think it's API is exactly like the one you described, but every time I've heard of a project doing Java source generation they've used JET or a homegrown tool.

blocks|key|3368371|text|我是为了一个模拟生成器工具而自己做的。这是一项非常简单的任务，即使您需要遵循Sun格式指南。我敢打赌，你会更快地完成代码，而不是在互联网上找到符合你目标的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3368372|基本上，您自己已经概述了API。现在就用实际的代码填充它吧！|3368373|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I was doing it myself for a mock generator tool. It's a very simple task, even if you need to follow Sun formatting guidelines. I bet you'd finish the code that does it faster then you found something that fits your goal on the Internet.

You've basically outlined the API yourself. Just fill it with the actual code now!

blocks|key|3155497|text|另一种选择是Eclipse+JDT的AST，如果您需要重写任意Java源代码，而不仅仅是生成源代码，那么它很好用。(我相信它可以独立于eclipse使用)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3155498|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Another alternative is Eclipse JDT's AST which is good if you need to rewrite arbitrary Java source code rather than just generate source code.
(and I believe it can be used independently from eclipse).

blocks|key|363825|text|我不知道有什么库，但是一个通用的模板引擎可能就是你所需要的。有a+bunch+of+them，我个人对FreeMarker有很好的体验|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|363826|entityMap|0|LINK|mutability|MUTABLE|url|http://java-source.net/open-source/template-engines|1|http://www.freemarker.org/index.html^0|V|F|0|1F|A|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Don't know of a library, but a generic template engine might be all you need. There are <a href="http://java-source.net/open-source/template-engines" rel="nofollow noreferrer">a bunch of them</a>, I personally have had good experience with <a href="http://www.freemarker.org/index.html" rel="nofollow noreferrer">FreeMarker</a>

blocks|key|3368464|text|Sun提供了一个名为CodeModel的应用程序接口，用于使用应用程序接口生成Java源文件。这并不是获取信息最容易的事情，但它就在那里，而且工作得非常好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3368465|获得它的最简单方法是将其作为JAXB2RI的一部分--+XJC+schema-+to+-java生成器使用CodeModel生成其java源代码，并且它是XJC的一部分。您可以将其仅用于CodeModel。|3368466|从http://codemodel.java.net/上获取它|offset|length|3368467|entityMap|0|LINK|mutability|MUTABLE|url|http://codemodel.java.net/^0|0|0|1|Q|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Sun provides an API called CodeModel for generating Java source files using an API. It's not the easiest thing to get information on, but it's there and it works extremely well.

The easiest way to get hold of it is as part of the JAXB 2 RI - the XJC schema-to-java generator uses CodeModel to generate its java source, and it's part of the XJC jars. You can use it just for the CodeModel.

Grab it from <a href="http://codemodel.java.net/" rel="noreferrer">http://codemodel.java.net/</a>

blocks|key|361958|text|通过CodeModel找到解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|361959|谢谢，skaffman。|361960|例如，使用以下代码：|361961|JCodeModel+cm+=+new+JCodeModel();
JDefinedClass+dc+=+cm._class("foo.Bar");
JMethod+m+=+dc.method(0,+int.class,+"foo");
m.body()._return(JExpr.lit(5));

File+file+=+new+File("./target/classes");
file.mkdirs();
cm.build(file);|code-block|syntax|javascript|361962|我可以得到以下输出：|361963|package+foo;
public+class+Bar+{
++++int+foo()+{
++++++++return++5;
++++}
}|361964|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/21234/skaffman^0|D|4|0|0|C|3|8|0|0|0|A|0|0|0|A|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|H|3|I|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1C|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1G|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

Solution found with CodeModel 
Thanks, <a href="https://stackoverflow.com/users/21234/skaffman">skaffman</a>.

For example, with this code:

<pre><code>JCodeModel cm = new JCodeModel();
JDefinedClass dc = cm._class("foo.Bar");
JMethod m = dc.method(0, int.class, "foo");
m.body()._return(JExpr.lit(5));

File file = new File("./target/classes");
file.mkdirs();
cm.build(file);
</code></pre>

I can get this output:

<pre><code>package foo;
public class Bar {
 int foo() {
 return 5;
 }
}
</code></pre>

blocks|key|366766|text|使用Eclipse+JDT的AST找到解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|366767|谢谢，Giles。|366768|例如，使用以下代码：|366769|AST+ast+=+AST.newAST(AST.JLS3);
CompilationUnit+cu+=+ast.newCompilationUnit();

PackageDeclaration+p1+=+ast.newPackageDeclaration();
p1.setName(ast.newSimpleName("foo"));
cu.setPackage(p1);

ImportDeclaration+id+=+ast.newImportDeclaration();
id.setName(ast.newName(new+String[]+{+"java",+"util",+"Set"+}));
cu.imports().add(id);

TypeDeclaration+td+=+ast.newTypeDeclaration();
td.setName(ast.newSimpleName("Foo"));
TypeParameter+tp+=+ast.newTypeParameter();
tp.setName(ast.newSimpleName("X"));
td.typeParameters().add(tp);
cu.types().add(td);

MethodDeclaration+md+=+ast.newMethodDeclaration();
td.bodyDeclarations().add(md);

Block+block+=+ast.newBlock();
md.setBody(block);

MethodInvocation+mi+=+ast.newMethodInvocation();
mi.setName(ast.newSimpleName("x"));

ExpressionStatement+e+=+ast.newExpressionStatement(mi);
block.statements().add(e);

System.out.println(cu);|code-block|syntax|javascript|366770|我可以得到以下输出：|366771|package+foo;
import+java.util.Set;
class+Foo<X>+{
++void+MISSING(){
++++x();
++}
}|366772|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/11835/giles^0|J|4|0|0|9|3|5|0|0|0|A|0|0|0|A|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|H|3|I|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1C|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1G|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

Solution found with Eclipse JDT's AST 
Thanks, <a href="https://stackoverflow.com/users/11835/giles">Giles</a>.

For example, with this code:

<pre><code>AST ast = AST.newAST(AST.JLS3);
CompilationUnit cu = ast.newCompilationUnit();

PackageDeclaration p1 = ast.newPackageDeclaration();
p1.setName(ast.newSimpleName("foo"));
cu.setPackage(p1);

ImportDeclaration id = ast.newImportDeclaration();
id.setName(ast.newName(new String[] { "java", "util", "Set" }));
cu.imports().add(id);

TypeDeclaration td = ast.newTypeDeclaration();
td.setName(ast.newSimpleName("Foo"));
TypeParameter tp = ast.newTypeParameter();
tp.setName(ast.newSimpleName("X"));
td.typeParameters().add(tp);
cu.types().add(td);

MethodDeclaration md = ast.newMethodDeclaration();
td.bodyDeclarations().add(md);

Block block = ast.newBlock();
md.setBody(block);

MethodInvocation mi = ast.newMethodInvocation();
mi.setName(ast.newSimpleName("x"));

ExpressionStatement e = ast.newExpressionStatement(mi);
block.statements().add(e);

System.out.println(cu);
</code></pre>

I can get this output:

<pre><code>package foo;
import java.util.Set;
class Foo&lt;X&gt; {
 void MISSING(){
 x();
 }
}
</code></pre>

blocks|key|366774|text|还有StringTemplate。它是由ANTLR的作者编写的，功能非常强大。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|366775|entityMap|0|LINK|mutability|MUTABLE|url|http://www.stringtemplate.org/^0|2|E|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

There is also <a href="http://www.stringtemplate.org/" rel="nofollow noreferrer">StringTemplate</a>. It is by the author of ANTLR and is quite powerful.

blocks|key|363931|text|这真的取决于你想要做什么。代码生成本身就是一个主题。在没有特定用例的情况下，我建议查看velocity代码生成/模板库。此外，如果您正在离线进行代码生成，我建议使用ArgoUML之类的工具从UML图/对象模型转换为Java代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|363932|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It really depends on what you are trying to do. Code generation is a topic within itself. Without a specific use-case, I suggest looking at velocity code generation/template library. Also, if you are doing the code generation offline, I would suggest using something like ArgoUML to go from UML diagram/Object model to Java code.

blocks|key|3368665|text|我构建了一个看起来非常像你的理论DSL的东西，叫做"sourcegen"，但从技术上讲，它不是我写的ORM的util项目。DSL看起来像这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3368666|@Test
public+void+testTwoMethods()+{
++++GClass+gc+=+new+GClass("foo.bar.Foo");

++++GMethod+hello+=+gc.getMethod("hello");
++++hello.arguments("String+foo");
++++hello.setBody("return+'Hi'+%2B+foo;");

++++GMethod+goodbye+=+gc.getMethod("goodbye");
++++goodbye.arguments("String+foo");
++++goodbye.setBody("return+'Bye'+%2B+foo;");

++++Assert.assertEquals(
++++Join.lines(new+Object[]+{
++++++++"package+foo.bar;",
++++++++"",
++++++++"public+class+Foo+{",
++++++++"",
++++++++"++++public+void+hello(String+foo)+{",
++++++++"++++++++return+\"Hi\"+%2B+foo;",
++++++++"++++}",
++++++++"",
++++++++"++++public+void+goodbye(String+foo)+{",
++++++++"++++++++return+\"Bye\"+%2B+foo;",
++++++++"++++}",
++++++++"",
++++++++"}",
++++++++""+}),
++++gc.toCode());
}|code-block|syntax|javascript|3368667|https://github.com/stephenh/joist/blob/master/util/src/test/java/joist/sourcegen/GClassTest.java|offset|length|3368668|它还做了一些巧妙的事情，比如“自动组织导入”参数/返回类型中的任何FQCN，自动修剪在此codegen运行中未被触及的任何旧文件，正确地缩进内部类等。|3368669|这个想法是，生成的代码应该看起来很美观，没有警告(未使用的导入等)，就像你的其余代码一样。这么多生成的代码读起来很难看……太可怕了。|3368670|无论如何，文档不是很多，但我认为API非常简单/直观。如果有人感兴趣的话，Maven就是here。|3368671|entityMap|0|LINK|mutability|MUTABLE|url|1|http://repo.joist.ws/joist/joist-util/^0|0|0|0|2O|0|0|0|0|18|4|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|11|8|@]|9|@$I|12|J|13|1|14]]|A|$]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|16|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@$I|18|J|19|1|1A]]|A|$]]|$1|Q|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|H]]|X|$5|T|U|V|A|$W|Y]]]]

I built something that looks very much like your theoretical DSL, called "sourcegen", but technically instead of a util project for an ORM I wrote. The DSL looks like:

<pre><code>@Test
public void testTwoMethods() {
 GClass gc = new GClass("foo.bar.Foo");

 GMethod hello = gc.getMethod("hello");
 hello.arguments("String foo");
 hello.setBody("return 'Hi' + foo;");

 GMethod goodbye = gc.getMethod("goodbye");
 goodbye.arguments("String foo");
 goodbye.setBody("return 'Bye' + foo;");

 Assert.assertEquals(
 Join.lines(new Object[] {
 "package foo.bar;",
 "",
 "public class Foo {",
 "",
 " public void hello(String foo) {",
 " return \"Hi\" + foo;",
 " }",
 "",
 " public void goodbye(String foo) {",
 " return \"Bye\" + foo;",
 " }",
 "",
 "}",
 "" }),
 gc.toCode());
}
</code></pre>

<a href="https://github.com/stephenh/joist/blob/master/util/src/test/java/joist/sourcegen/GClassTest.java" rel="nofollow">https://github.com/stephenh/joist/blob/master/util/src/test/java/joist/sourcegen/GClassTest.java</a>

It also does some neat things like "Auto-organize imports" any FQCNs in parameters/return types, auto-pruning any old files that were not touched in this codegen run, correctly indenting inner classes, etc.

The idea is that generated code should be pretty to look at it, with no warnings (unused imports, etc.), just like the rest of your code. So much generated code is ugly to read...it's horrible.

Anyway, there is not a lot of docs, but I think the API is pretty simple/intuitive. The Maven repo is <a href="http://repo.joist.ws/joist/joist-util/" rel="nofollow">here</a> if anyone is interested.

blocks|key|363951|text|示例:+1/|type|unstyled|depth|inlineStyleRanges|entityRanges|data|363952|private+JFieldVar+generatedField;|code-block|syntax|javascript|363953|2/|363954|String+className+=+"class+name";
++++++++/*+package+name+*/
++++++++JPackage+jp+=+jCodeModel._package("package+name+");
+++++++++/*++class+name++*/
++++++++JDefinedClass+jclass+=+jp._class(className);
++++++++/*+add+comment+*/
++++++++JDocComment+jDocComment+=+jclass.javadoc();
++++++++jDocComment.add("By+AUTOMAT+D.I.T+tools+:+"+%2B+new+Date()+%2B"+=>+"+%2B+className);
++++++++//+génération+des+getter+&+setter+&+attribues

++++++++++++//+create+attribue+
+++++++++++++this.generatedField+=+jclass.field(JMod.PRIVATE,+Integer.class)+
+++++++++++++++++++++,+"attribue+name+");
+++++++++++++//+getter
+++++++++++++JMethod+getter+=+jclass.method(JMod.PUBLIC,+Integer.class)+
+++++++++++++++++++++,+"attribue+name+");
+++++++++++++getter.body()._return(this.generatedField);
+++++++++++++//+setter
+++++++++++++JMethod+setter+=+jclass.method(JMod.PUBLIC,+Integer.class)+
+++++++++++++++++++++,"attribue+name+");
+++++++++++++//+create+setter+paramétre+
+++++++++++++JVar+setParam+=+setter.param(getTypeDetailsForCodeModel(Integer.class,"param+name");
+++++++++++++//+affectation++(+this.param+=+setParam+)+
+++++++++++++setter.body().assign(JExpr._this().ref(this.generatedField),+setParam);

++++++++jCodeModel.build(new+File("path+c://javaSrc//"));|363955|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Exemple : 
1/ 

<pre><code>private JFieldVar generatedField;
</code></pre>

2/

<pre><code>String className = "class name";
 /* package name */
 JPackage jp = jCodeModel._package("package name ");
 /* class name */
 JDefinedClass jclass = jp._class(className);
 /* add comment */
 JDocComment jDocComment = jclass.javadoc();
 jDocComment.add("By AUTOMAT D.I.T tools : " + new Date() +" =&gt; " + className);
 // génération des getter &amp; setter &amp; attribues

 // create attribue 
 this.generatedField = jclass.field(JMod.PRIVATE, Integer.class) 
 , "attribue name ");
 // getter
 JMethod getter = jclass.method(JMod.PUBLIC, Integer.class) 
 , "attribue name ");
 getter.body()._return(this.generatedField);
 // setter
 JMethod setter = jclass.method(JMod.PUBLIC, Integer.class) 
 ,"attribue name ");
 // create setter paramétre 
 JVar setParam = setter.param(getTypeDetailsForCodeModel(Integer.class,"param name");
 // affectation ( this.param = setParam ) 
 setter.body().assign(JExpr._this().ref(this.generatedField), setParam);

 jCodeModel.build(new File("path c://javaSrc//"));
</code></pre>

blocks|key|3155812|text|有一个新的项目write-it-once。基于模板的代码生成器。您可以使用Groovy编写自定义模板，并根据java反射生成文件。这是生成任何文件的最简单的方法。您可以通过生成AspectJ文件、基于JPA注解的SQL、基于枚举的插入/更新等等来创建getters/settest/toString。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3155813|模板示例：|3155814|package+${cls.package.name};

public+class+${cls.shortName}Builder+{

++++public+static+${cls.name}Builder+builder()+{
++++++++return+new+${cls.name}Builder();
++++}
<%25+for(field+in+cls.fields)+{%25>
++++private+${field.type.name}+${field.name};
<%25+}+%25>
<%25+for(field+in+cls.fields)+{%25>
++++public+${cls.name}Builder+${field.name}(${field.type.name}+${field.name})+{
++++++++this.${field.name}+=+${field.name};
++++++++return+this;
++++}
<%25+}+%25>
++++public+${cls.name}+build()+{
++++++++final+${cls.name}+data+=+new+${cls.name}();
<%25+for(field+in+cls.fields)+{%25>
++++++++data.${field.setter.name}(this.${field.name});
<%25+}+%25>
++++++++return+data;
++++}
}|code-block|syntax|javascript|3155815|entityMap|0|LINK|mutability|MUTABLE|url|https://code.google.com/p/write-it-once/|1|http://groovy.codehaus.org/Groovy%2BTemplates^0|7|D|0|11|6|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|12|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

There is new project <a href="https://code.google.com/p/write-it-once/" rel="nofollow">write-it-once</a>. Template based code generator. You write custom template using <a href="http://groovy.codehaus.org/Groovy+Templates" rel="nofollow">Groovy</a>, and generate file depending on java reflections. It's the simplest way to generate any file. You can make getters/settest/toString by generating AspectJ files, SQL based on JPA annotations, inserts / updates based on enums and so on.

Template example:

<pre><code>package ${cls.package.name};

public class ${cls.shortName}Builder {

 public static ${cls.name}Builder builder() {
 return new ${cls.name}Builder();
 }
&lt;% for(field in cls.fields) {%&gt;
 private ${field.type.name} ${field.name};
&lt;% } %&gt;
&lt;% for(field in cls.fields) {%&gt;
 public ${cls.name}Builder ${field.name}(${field.type.name} ${field.name}) {
 this.${field.name} = ${field.name};
 return this;
 }
&lt;% } %&gt;
 public ${cls.name} build() {
 final ${cls.name} data = new ${cls.name}();
&lt;% for(field in cls.fields) {%&gt;
 data.${field.setter.name}(this.${field.name});
&lt;% } %&gt;
 return data;
 }
}
</code></pre>

blocks|key|3368752|text|您可以使用Roaster+(https://github.com/forge/roaster)来执行代码生成。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3368753|下面是一个示例：|3368754|JavaClassSource+source+=+Roaster.create(JavaClassSource.class);
source.setName("MyClass").setPublic();
source.addMethod().setName("testMethod").setPrivate().setBody("return+null;")
+++++++++++.setReturnType(String.class).addAnnotation(MyAnnotation.class);
System.out.println(source);|code-block|syntax|javascript|3368755|将显示以下输出：|3368756|public+class+MyClass+{
+++private+String+testMethod()+{
+++++++return+null;
+++}
}|3368757|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/forge/roaster^0|E|W|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

You can use Roaster (<a href="https://github.com/forge/roaster">https://github.com/forge/roaster</a>) to do code generation.

Here is an example: 

<pre><code>JavaClassSource source = Roaster.create(JavaClassSource.class);
source.setName("MyClass").setPublic();
source.addMethod().setName("testMethod").setPrivate().setBody("return null;")
 .setReturnType(String.class).addAnnotation(MyAnnotation.class);
System.out.println(source);
</code></pre>

will display the following output:

<pre><code>public class MyClass {
 private String testMethod() {
 return null;
 }
}
</code></pre>

blocks|key|3368786|text|下面是一个JSON-to-POJO项目，看起来很有趣：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3368787|http://www.jsonschema2pojo.org/|offset|length|3368788|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Here is a JSON-to-POJO project that looks interesting:

<a href="http://www.jsonschema2pojo.org/" rel="nofollow">http://www.jsonschema2pojo.org/</a>

I'm looking for a framework to generate Java source files.

Something like the following API:

<pre><code>X clazz = Something.createClass("package name", "class name");
clazz.addSuperInterface("interface name");
clazz.addMethod("method name", returnType, argumentTypes, ...);

File targetDir = ...;
clazz.generate(targetDir);
</code></pre>

Then, a java source file should be found in a sub-directory of the target directory.

Does anyone know such a framework?

<hr>

EDIT:

<ol>
<li>I really need the source files.</li>
<li>I also would like to fill out the code of the methods.</li>
<li>I'm looking for a high-level abstraction, not direct bytecode manipulation/generation.</li>
<li>I also need the "structure of the class" in a tree of objects.</li>
<li>The problem domain is general: to generate a large amount of very different classes, without a "common structure".</li>
</ol>

<hr>

SOLUTIONS 
I have posted 2 answers based in your answers... <a href="https://stackoverflow.com/questions/121324/a-java-api-to-generate-java-source-files#136010">with CodeModel</a> and <a href="https://stackoverflow.com/questions/121324/a-java-api-to-generate-java-source-files#136016">with Eclipse JDT</a>.

I have used <a href="http://codemodel.java.net/" rel="noreferrer">CodeModel</a> in my solution, :-)

A Java API to generate Java source files

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我正在寻找一个框架来生成Java源文件。类似于下面的API：X clazz = Something.createClass("package name", "class name");clazz.addSuperInterface("interface name");clazz.addMethod("method na...

问用于生成Java源文件的Java API
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