String 判断是否包含 .$|()[{^?* 等特殊符号，并split截取

最新推荐文章于 2022-09-21 07:24:05 发布

果冻906

最新推荐文章于 2022-09-21 07:24:05 发布

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分类专栏：特殊字符截取文章标签：特殊字符截取

本文链接：https://blog.youkuaiyun.com/weixin_41592396/article/details/99550168

特殊字符截取专栏收录该内容

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本文介绍了一个在Java中处理字符串的小技巧，特别是在使用split方法时如何避免因正则表达式错误导致的问题。通过正确的转义字符，可以确保代码的正确运行。

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文字处理发现了个小问题：

public static void main(string [] args){

String info = "我是一颗小草[1.0g*10瓶*600盒].大草";

if(info.indexOf("[")!=-1){
           String string = info.split("[")[0];
           skuName = string.trim();
       }else{
           skuName = info;
       }

       System.out.println(skuName);

}

split("[")会报错

java.util.regex.PatternSyntaxException: Unclosed character class near index 0
[
^
   at java.util.regex.Pattern.error(Pattern.java:1924)
   at java.util.regex.Pattern.clazz(Pattern.java:2493)
   at java.util.regex.Pattern.sequence(Pattern.java:2030)
   at java.util.regex.Pattern.expr(Pattern.java:1964)
   at java.util.regex.Pattern.compile(Pattern.java:1665)
   at java.util.regex.Pattern.<init>(Pattern.java:1337)
   at java.util.regex.Pattern.compile(Pattern.java:1022)
   at java.lang.String.split(String.java:2313)
   at java.lang.String.split(String.java:2355)
   at com.jxfy.JxOracleUtil.test(JxOracleUtil.java:230)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
   at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

indexOf()方法参数可以是char也可以是String

需要再[字符前面加\\ 或者/都可以

修改后如下：

public static void main(string [] args){

String info = "我是一颗小草[1.0g*10瓶*600盒].大草";

if(info.indexOf('[')!=-1){
           String string = info.split("\\[")[0];
           skuName = string.trim();
       }else{
           skuName = info;
       }

       System.out.println(skuName);

}