无法处理大于 65535 个字符的字符串文字。编译器抛出 IllegalArgumentException
Unable to handle String literals size greater than 65535 characters. Compiler throws IllegalArgumentException
我正在尝试在 Scala 中解码 Base64 编码的图像。字符串文字的长度超过 65535 个字符。每当我尝试编译以下代码时，编译器都会给出 IllegalArgumentException。
Scala 代码：
val data = "/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAA ... "
val imageByte = Base64.getDecoder.decode(data)
val byteArray = new ByteArrayInputStream(imageByte)
val image = ImageIO.read(byteArray)
ImageIO.write(image, "jpeg", new File("image.jpeg"))
编译器异常：
Error:scalac: Error: org.jetbrains.jps.incremental.scala.remote.ServerException
java.lang.IllegalArgumentException
at scala.tools.asm.ByteVector.putUTF8(ByteVector.java:213)
at scala.tools.asm.ClassWriter.newUTF8(ClassWriter.java:1092)
at scala.tools.asm.ClassWriter.newString(ClassWriter.java:1525)
at scala.tools.asm.ClassWriter.newConstItem(ClassWriter.java:1042)
at scala.tools.asm.MethodWriter.visitLdcInsn(MethodWriter.java:1134)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genConstant(GenASM.scala:1582)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.scala$tools$nsc$backend$jvm$GenASM$JPlainBuilder$$genInstr(GenASM.scala:2296)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$$anonfun$genBlock.apply(GenASM.scala:2227)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$$anonfun$genBlock.apply(GenASM.scala:2213)
at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
at scala.tools.nsc.backend.icode.BasicBlocks$BasicBlock.foreach(BasicBlocks.scala:195)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genBlock(GenASM.scala:2213)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genBlocks(GenASM.scala:2151)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genCode(GenASM.scala:2746)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genMethod(GenASM.scala:1471)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genClass(GenASM.scala:1341)
at scala.tools.nsc.backend.jvm.GenASM$AsmPhase.emitFor(GenASM.scala:198)
at scala.tools.nsc.backend.jvm.GenASM$AsmPhase.run(GenASM.scala:204)
at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1501)
at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1486)
at scala.tools.nsc.Global$Run.compileSources(Global.scala:1481)
at scala.tools.nsc.Global$Run.compile(Global.scala:1582)
at xsbt.CachedCompiler0.run(CompilerInterface.scala:115)
at xsbt.CachedCompiler0.run(CompilerInterface.scala:94)
at xsbt.CompilerInterface.run(CompilerInterface.scala:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:101)
at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:47)
at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
at org.jetbrains.jps.incremental.scala.local.IdeaIncrementalCompiler.compile(IdeaIncrementalCompiler.scala:29)
at org.jetbrains.jps.incremental.scala.local.LocalServer.compile(LocalServer.scala:26)
at org.jetbrains.jps.incremental.scala.remote.Main$.make(Main.scala:67)
at org.jetbrains.jps.incremental.scala.remote.Main$.nailMain(Main.scala:24)
at org.jetbrains.jps.incremental.scala.remote.Main.nailMain(Main.scala)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.martiansoftware.nailgun.NGSession.run(NGSession.java:319)
根据这个 bug，我了解到根据 JVM 规范，字节长度大于 2 字节的字段不适合。经过详尽的搜索后，我无法找到解决此问题的方法，该错误仍然存在。在 Java/Scala.
中处理长字符串文字可能是一个很好的解决方法
如果一次可以读取四个字节，则解码后将正好对应三个字节。将它们连接在一起，你会得到相同的结果。
当文字这么长时，由于可读性问题，它真的不应该再嵌入到代码中。我会从 file/resource.
加载它
Java
使用 Commons IO 这真的很容易做到：
String str = IOUtils.toString(this.getClass().getResource("myResource", StandardCharsets.UTF_8);
我认为可读性稍差，但如果你真的不想使用任何库，你也可以从 Java 7:
开始
String str = new String(Files.readAllBytes(Paths.get("myResource")), StandardCharsets.UTF_8);
斯卡拉
在 Scala 中你可以使用 build-in scala.io.Source class:
val testTxtSource = Source.fromFile("myResource")
val str = testTxtSource.mkString()
testTxtSource.close()
我正在尝试在 Scala 中解码 Base64 编码的图像。字符串文字的长度超过 65535 个字符。每当我尝试编译以下代码时，编译器都会给出 IllegalArgumentException。
Scala 代码：
val data = "/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAA ... "
val imageByte = Base64.getDecoder.decode(data)
val byteArray = new ByteArrayInputStream(imageByte)
val image = ImageIO.read(byteArray)
ImageIO.write(image, "jpeg", new File("image.jpeg"))
编译器异常：
Error:scalac: Error: org.jetbrains.jps.incremental.scala.remote.ServerException
java.lang.IllegalArgumentException
at scala.tools.asm.ByteVector.putUTF8(ByteVector.java:213)
at scala.tools.asm.ClassWriter.newUTF8(ClassWriter.java:1092)
at scala.tools.asm.ClassWriter.newString(ClassWriter.java:1525)
at scala.tools.asm.ClassWriter.newConstItem(ClassWriter.java:1042)
at scala.tools.asm.MethodWriter.visitLdcInsn(MethodWriter.java:1134)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genConstant(GenASM.scala:1582)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.scala$tools$nsc$backend$jvm$GenASM$JPlainBuilder$$genInstr(GenASM.scala:2296)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$$anonfun$genBlock.apply(GenASM.scala:2227)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$$anonfun$genBlock.apply(GenASM.scala:2213)
at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
at scala.tools.nsc.backend.icode.BasicBlocks$BasicBlock.foreach(BasicBlocks.scala:195)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genBlock(GenASM.scala:2213)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genBlocks(GenASM.scala:2151)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genCode(GenASM.scala:2746)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genMethod(GenASM.scala:1471)
at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genClass(GenASM.scala:1341)
at scala.tools.nsc.backend.jvm.GenASM$AsmPhase.emitFor(GenASM.scala:198)
at scala.tools.nsc.backend.jvm.GenASM$AsmPhase.run(GenASM.scala:204)
at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1501)
at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1486)
at scala.tools.nsc.Global$Run.compileSources(Global.scala:1481)
at scala.tools.nsc.Global$Run.compile(Global.scala:1582)
at xsbt.CachedCompiler0.run(CompilerInterface.scala:115)
at xsbt.CachedCompiler0.run(CompilerInterface.scala:94)
at xsbt.CompilerInterface.run(CompilerInterface.scala:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:101)
at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:47)
at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
at org.jetbrains.jps.incremental.scala.local.IdeaIncrementalCompiler.compile(IdeaIncrementalCompiler.scala:29)
at org.jetbrains.jps.incremental.scala.local.LocalServer.compile(LocalServer.scala:26)
at org.jetbrains.jps.incremental.scala.remote.Main$.make(Main.scala:67)
at org.jetbrains.jps.incremental.scala.remote.Main$.nailMain(Main.scala:24)
at org.jetbrains.jps.incremental.scala.remote.Main.nailMain(Main.scala)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.martiansoftware.nailgun.NGSession.run(NGSession.java:319)
根据这个 bug，我了解到根据 JVM 规范，字节长度大于 2 字节的字段不适合。经过详尽的搜索后，我无法找到解决此问题的方法，该错误仍然存在。在 Java/Scala.
中处理长字符串文字可能是一个很好的解决方法如果一次可以读取四个字节，则解码后将正好对应三个字节。将它们连接在一起，你会得到相同的结果。
当文字这么长时，由于可读性问题，它真的不应该再嵌入到代码中。我会从 file/resource.
加载它Java
使用 Commons IO 这真的很容易做到：
String str = IOUtils.toString(this.getClass().getResource("myResource", StandardCharsets.UTF_8);
我认为可读性稍差，但如果你真的不想使用任何库，你也可以从 Java 7:
开始String str = new String(Files.readAllBytes(Paths.get("myResource")), StandardCharsets.UTF_8);
斯卡拉
在 Scala 中你可以使用 build-in scala.io.Source class:
val testTxtSource = Source.fromFile("myResource")
val str = testTxtSource.mkString()
testTxtSource.close()